chore: bump actions, reflow configs, fix examples

Bump codecov/codecov-action to v7 and docker/metadata-action
to v6 in the CI and release workflows.

Reflow .golangci.yml and html_styles.css under
the prettier plugin dprint now loads.

Exporter examples hand their export to the temp-dir helper instead of
pairing defer cleanup with log.Fatal. log.Fatal exits the process, so
the deferred cleanup never ran and a failed export left its temp dir
behind. gocritic reported it as exitAfterDefer.

.dprint.jsonc

@@ -0,0 +1,19 @@
+{
+	"$schema": "https://dprint.dev/schemas/v0.json",
+	"extends": "https://github.com/kjanat/kjanat/raw/8cb7b67/configs/dprint.remote.json",
+	"excludes": ["**/node_modules", "**/.venv", "**/bun.lock*"],
+	"plugins": [
+		"npm:@dprint/prettier@0.70.0/plugin.json@97c0dccf54ed5b7343e7a3f6418e77bd80afcd2b74beed3a632689d47e392ddc",
+		"npm:@dprint/exec@0.7.3/plugin.json@704701df449dd7e942a71144773778ac529d68c2e4657bfc236d393b898b9a67",
+	],
+	"markdown": { "associations": ["!README.md"] },
+	"prettier": { "associations": ["README.md"], "useTabs": false },
+	"exec": {
+		"cwd": "${configDir}",
+		"commands": [{
+			"command": "bunx tombi format - --stdin-filename {{file_path}}",
+			"exts": ["toml"],
+			"cacheKeyFiles": ["tombi.toml"],
+		}],
+	},
+}

.github/CONTRIBUTING.md

@@ -45,23 +45,23 @@ Enhancement suggestions are welcome! Please use the feature request template and
 
 2. **Clone and setup:**
 
-   ```bash
-   git clone https://github.com/your-username/articulate-parser.git
-   cd articulate-parser
-   go mod download
-   ```
+```bash
+git clone https://github.com/your-username/articulate-parser.git
+cd articulate-parser
+go mod download
+```
 
 3. **Run tests:**
 
-   ```bash
-   go test -v ./...
-   ```
+```bash
+go test -v ./...
+```
 
 4. **Build:**
 
-   ```bash
-   go build main.go
-   ```
+```bash
+go build main.go
+```
 
 ## Coding Standards
 

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,7 +1,7 @@
 name: Bug Report
 description: Create a report to help us improve
-title: '[BUG] '
-labels: ['bug', 'triage']
+title: "[BUG] "
+labels: ["bug", "triage"]
 body:
   - type: markdown
     attributes:
@@ -27,9 +27,9 @@ body:
         2. Parse file '...'
         3. See error
       value: |
-        1. 
-        2. 
-        3. 
+        1.
+        2.
+        3.
     validations:
       required: true
 

.github/PULL_REQUEST_TEMPLATE.md

@@ -5,11 +5,13 @@
 ## Related Issue
 
 <!-- Link to the issue this PR addresses using the syntax: Fixes #issue_number -->
+
 Fixes #
 
 ## Type of Change
 
 <!-- Mark the appropriate option with an "x" -->
+
 - [ ] Bug fix (non-breaking change which fixes an issue)
 - [ ] New feature (non-breaking change which adds functionality)
 - [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
@@ -21,6 +23,7 @@ Fixes #
 ## Checklist
 
 <!-- Mark the items you've completed with an "x" -->
+
 - [ ] My code follows the style guidelines of this project
 - [ ] I have performed a self-review of my code
 - [ ] I have added comments to complex logic
@@ -42,6 +45,7 @@ Fixes #
 ## Testing Instructions
 
 <!-- Provide steps to test the changes, if applicable -->
+
 1.
 2.
 3.

.github/dependabot.yml

@@ -1,86 +1,86 @@
 version: 2
 updates:
   # Check for updates to GitHub Actions
-  - package-ecosystem: 'github-actions'
-    directory: '/'
+  - package-ecosystem: "github-actions"
+    directory: "/"
     schedule:
-      interval: 'weekly'
-      day: 'monday'
-      time: '07:00'
-      timezone: 'Europe/Amsterdam'
+      interval: "weekly"
+      day: "monday"
+      time: "07:00"
+      timezone: "Europe/Amsterdam"
     open-pull-requests-limit: 2
     labels:
-      - 'dependencies'
-      - 'dependencies/github-actions'
+      - "dependencies"
+      - "dependencies/github-actions"
     commit-message:
-      prefix: 'ci'
-      include: 'scope'
+      prefix: "ci"
+      include: "scope"
 
   # Check for updates to Docker
-  - package-ecosystem: 'docker'
-    directory: '/'
+  - package-ecosystem: "docker"
+    directory: "/"
     schedule:
-      interval: 'weekly'
-      day: 'monday'
-      time: '07:00'
-      timezone: 'Europe/Amsterdam'
+      interval: "weekly"
+      day: "monday"
+      time: "07:00"
+      timezone: "Europe/Amsterdam"
     open-pull-requests-limit: 2
     labels:
-      - 'dependencies'
-      - 'dependencies/docker'
+      - "dependencies"
+      - "dependencies/docker"
     commit-message:
-      prefix: 'docker'
-      include: 'scope'
+      prefix: "docker"
+      include: "scope"
     groups:
       docker:
         patterns:
-          - '*'
+          - "*"
         update-types:
-          - 'minor'
-          - 'patch'
+          - "minor"
+          - "patch"
 
   # Check for updates to Docker Compose
-  - package-ecosystem: 'docker-compose'
-    directory: '/'
+  - package-ecosystem: "docker-compose"
+    directory: "/"
     schedule:
-      interval: 'weekly'
-      day: 'monday'
-      time: '07:00'
-      timezone: 'Europe/Amsterdam'
+      interval: "weekly"
+      day: "monday"
+      time: "07:00"
+      timezone: "Europe/Amsterdam"
     open-pull-requests-limit: 2
     labels:
-      - 'dependencies'
-      - 'dependencies/docker-compose'
+      - "dependencies"
+      - "dependencies/docker-compose"
     commit-message:
-      prefix: 'docker'
-      include: 'scope'
+      prefix: "docker"
+      include: "scope"
     groups:
       docker:
         patterns:
-          - '*'
+          - "*"
         update-types:
-          - 'minor'
-          - 'patch'
+          - "minor"
+          - "patch"
 
   # Check for updates to Go modules
-  - package-ecosystem: 'gomod'
-    directory: '/'
+  - package-ecosystem: "gomod"
+    directory: "/"
     schedule:
-      interval: 'weekly'
-      day: 'monday'
-      time: '07:00'
-      timezone: 'Europe/Amsterdam'
+      interval: "weekly"
+      day: "monday"
+      time: "07:00"
+      timezone: "Europe/Amsterdam"
     open-pull-requests-limit: 2
     labels:
-      - 'dependencies'
-      - 'dependencies/go'
+      - "dependencies"
+      - "dependencies/go"
     commit-message:
-      prefix: 'deps'
-      include: 'scope'
+      prefix: "deps"
+      include: "scope"
     groups:
       go-modules:
         patterns:
-          - '*'
+          - "*"
         update-types:
-          - 'minor'
-          - 'patch'
+          - "minor"
+          - "patch"

.github/workflows/autofix.yml

@@ -2,7 +2,7 @@ name: autofix.ci
 on:
   pull_request:
   push:
-    branches: [ "master" ]
+    branches: ["master"]
 permissions:
   contents: read
 
@@ -11,18 +11,18 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v7
 
       - name: Install Task
-        uses: go-task/setup-task@v1
+        uses: go-task/setup-task@v2
 
-      - uses: actions/setup-go@v6
-        with: { go-version-file: 'go.mod' }
+      - uses: actions/setup-go@v7
+        with: { go-version-file: "go.mod" }
 
       - name: Setup go deps
         run: |
           # Install golangci-lint
-          curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/HEAD/install.sh | sh -s -- -b "$(go env GOPATH)/bin"
+          curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/HEAD/install.sh | sh -s -- -b $(go env GOPATH)/bin
 
           # Install go-task dependencies
           go install golang.org/x/tools/cmd/goimports@latest

.github/workflows/ci.yml

@@ -2,7 +2,7 @@ name: CI
 
 on:
   push:
-    branches: ['master', 'develop']
+    branches: ["master", "develop"]
   pull_request:
 
 env:
@@ -21,12 +21,12 @@ jobs:
       contents: read
       pull-requests: read
     steps:
-      - uses: actions/checkout@v5
-      - uses: actions/setup-go@v6
+      - uses: actions/checkout@v7
+      - uses: actions/setup-go@v7
         with:
           go-version: stable
       - name: golangci-lint
-        uses: golangci/golangci-lint-action@v8
+        uses: golangci/golangci-lint-action@v9
         with: { version: latest }
 
   test:
@@ -35,23 +35,26 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: write
-    strategy:
-      matrix:
-        go:
-          - 1.24.x
-          - 1.25.x
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v7
 
-      - name: Set up Go ${{ matrix.go }}
-        uses: actions/setup-go@v6
+      - name: Set up Go
+        id: setup-go
+        uses: actions/setup-go@v7
         with:
-          go-version: ${{ matrix.go }}
+          go-version-file: go.mod
           check-latest: true
 
+      # Expose the resolved Go version as an env var so it is never
+      # interpolated directly into a shell script (avoids script injection).
+      - name: Export Go version
+        env:
+          GO_VERSION: ${{ steps.setup-go.outputs.go-version }}
+        run: echo "GO_VERSION=$GO_VERSION" >> "$GITHUB_ENV"
+
       - name: Install Task
-        uses: go-task/setup-task@v1
+        uses: go-task/setup-task@v2
 
       - name: Show build info
         run: task info
@@ -70,7 +73,7 @@ jobs:
           {
             cat << EOF
           ## 🔧 Test Environment
-          - **Go Version:** ${{ matrix.go }}
+          - **Go Version:** $GO_VERSION
           - **OS:** ubuntu-latest
           - **Timestamp:** $(date -u)
 
@@ -83,14 +86,14 @@ jobs:
           # Extract test results for summary
           TEST_STATUS=$?
           TOTAL_TESTS=$(grep -c "=== RUN" test-output.log || echo "0")
-          PASSED_TESTS=$(grep -c -- "--- PASS:" test-output.log || echo "0")
-          FAILED_TESTS=$(grep -c -- "--- FAIL:" test-output.log || echo "0")
-          SKIPPED_TESTS=$(grep -c -- "--- SKIP:" test-output.log || echo "0")
+          PASSED_TESTS=$(grep -c "--- PASS:" test-output.log || echo "0")
+          FAILED_TESTS=$(grep -c "--- FAIL:" test-output.log || echo "0")
+          SKIPPED_TESTS=$(grep -c "--- SKIP:" test-output.log || echo "0")
 
           # Generate test summary
           {
             cat << EOF
-          ## 🧪 Test Results (Go ${{ matrix.go }})
+          ## 🧪 Test Results (Go $GO_VERSION)
 
           | Metric      | Value                                                         |
           | ----------- | ------------------------------------------------------------- |
@@ -106,31 +109,31 @@ jobs:
           |---------|--------|
           EOF
 
-          # Extract package results
-          grep "^ok\|^FAIL" test-output.log | while read -r line; do
-            if [[ $line == ok* ]]; then
-              pkg=$(echo "$line" | awk '{print $2}')
-              echo "| $pkg | ✅ PASS |"
-            elif [[ $line == FAIL* ]]; then
-              pkg=$(echo "$line" | awk '{print $2}')
-              echo "| $pkg | ❌ FAIL |"
-            fi
-          done
+            # Extract package results
+            grep "^ok\|^FAIL" test-output.log | while read -r line; do
+              if [[ $line == ok* ]]; then
+                pkg=$(echo "$line" | awk '{print $2}')
+                echo "| $pkg | ✅ PASS |"
+              elif [[ $line == FAIL* ]]; then
+                pkg=$(echo "$line" | awk '{print $2}')
+                echo "| $pkg | ❌ FAIL |"
+              fi
+            done
 
-          echo ""
+            echo ""
 
-          # Add detailed results if tests failed
-          if [ "$TEST_STATUS" -ne 0 ]; then
-            cat << 'EOF'
+            # Add detailed results if tests failed
+            if [ "$TEST_STATUS" -ne 0 ]; then
+              cat << 'EOF'
           ### ❌ Failed Tests Details
           ```
           EOF
-            grep -A 10 -- "--- FAIL:" test-output.log | head -100
-            cat << 'EOF'
+              grep -A 10 -- "--- FAIL:" test-output.log | head -100
+              cat << 'EOF'
           ```
 
           EOF
-          fi
+            fi
           } >> "$GITHUB_STEP_SUMMARY"
 
           # Set outputs for other steps
@@ -152,7 +155,7 @@ jobs:
 
             {
               cat << EOF
-          ## 📊 Code Coverage (Go ${{ matrix.go }})
+          ## 📊 Code Coverage (Go $GO_VERSION)
 
           **Total Coverage: $COVERAGE**
 
@@ -211,9 +214,9 @@ jobs:
 
       - name: Upload test artifacts
         if: failure()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v7
         with:
-          name: test-results-go-${{ matrix.go }}
+          name: test-results-go-${{ env.GO_VERSION }}
           path: |
             test-output.log
             coverage/
@@ -221,10 +224,9 @@ jobs:
 
       - name: Run linters
         run: |
-          # Initialize summary
           {
             cat << EOF
-          ## 🔍 Static Analysis (Go ${{ matrix.go }})
+          ## 🔍 Static Analysis (Go $GO_VERSION)
 
           EOF
 
@@ -268,9 +270,10 @@ jobs:
       - name: Job Summary
         if: always()
         run: |
-          cat >> "$GITHUB_STEP_SUMMARY" << 'EOF'
-          ## 📋 Job Summary (Go ${{ matrix.go }})
-
+          {
+            echo "## 📋 Job Summary (Go $GO_VERSION)"
+            echo ""
+            cat << 'EOF'
           | Step            | Status                                                          |
           | --------------- | --------------------------------------------------------------- |
           | Dependencies    | Success                                                         |
@@ -280,12 +283,13 @@ jobs:
           | Static Analysis | ${{ job.status == 'success' && 'Clean' || 'Issues' }}           |
           | Code Formatting | ${{ job.status == 'success' && 'Clean' || 'Issues' }}           |
           EOF
+          } >> "$GITHUB_STEP_SUMMARY"
 
       - name: Upload coverage reports to Codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v7
         with:
           files: ./coverage/coverage.out
-          flags: Go ${{ matrix.go }}
+          flags: Go ${{ env.GO_VERSION }}
           slug: kjanat/articulate-parser
           token: ${{ secrets.CODECOV_TOKEN }}
 
@@ -293,7 +297,7 @@ jobs:
         if: ${{ !cancelled() }}
         uses: codecov/test-results-action@v1
         with:
-          flags: Go ${{ matrix.go }}
+          flags: Go ${{ env.GO_VERSION }}
           token: ${{ secrets.CODECOV_TOKEN }}
 
   docker-test:
@@ -304,19 +308,19 @@ jobs:
       contents: read
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v7
 
       - name: Set up Go
-        uses: actions/setup-go@v6
+        uses: actions/setup-go@v7
         with:
           go-version-file: go.mod
           check-latest: true
 
       - name: Install Task
-        uses: go-task/setup-task@v1
+        uses: go-task/setup-task@v2
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Build Docker image using Task
         run: task docker:build
@@ -349,13 +353,14 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: read
+      pull-requests: write
     if: github.event_name == 'pull_request'
     steps:
-      - name: 'Checkout Repository'
-        uses: actions/checkout@v5
+      - name: "Checkout Repository"
+        uses: actions/checkout@v7
 
-      - name: 'Dependency Review'
-        uses: actions/dependency-review-action@v4
+      - name: "Dependency Review"
+        uses: actions/dependency-review-action@v5
         with:
           fail-on-severity: moderate
           comment-summary-in-pr: always
@@ -366,37 +371,37 @@ jobs:
     permissions:
       contents: read
       packages: write
-    needs: [test]
+    needs: [test, docker-test]
     if: |
       github.event_name == 'push' && (github.ref == 'refs/heads/master' ||
       github.ref == 'refs/heads/develop' ||
       startsWith(github.ref, 'refs/heads/feature/docker'))
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v7
 
       - name: Login to Docker Hub
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           username: ${{ vars.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Log in to GitHub Container Registry
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@v4
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Extract metadata
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: |
             ${{ env.IMAGE_NAME }}
@@ -417,7 +422,7 @@ jobs:
             org.opencontainers.image.documentation=https://github.com/${{ github.repository }}/blob/master/DOCKER.md
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           # Multi-architecture build - Docker automatically provides TARGETOS, TARGETARCH, etc.

.github/workflows/codeql.yml

@@ -17,7 +17,7 @@ name: "CodeQL"
 on:
   workflow_call:
   schedule:
-    - cron: '44 16 * * 6'
+    - cron: "44 16 * * 6"
   # push:
   #   branches: [ "master" ]
   # pull_request:
@@ -47,58 +47,58 @@ jobs:
       fail-fast: false
       matrix:
         include:
-        - language: actions
-          build-mode: none
-        - language: go
-          build-mode: autobuild
-        # CodeQL supports the following values keywords for 'language': 'actions', 'c-cpp', 'csharp', 'go', 'java-kotlin', 'javascript-typescript', 'python', 'ruby', 'swift'
-        # Use `c-cpp` to analyze code written in C, C++ or both
-        # Use 'java-kotlin' to analyze code written in Java, Kotlin or both
-        # Use 'javascript-typescript' to analyze code written in JavaScript, TypeScript or both
-        # To learn more about changing the languages that are analyzed or customizing the build mode for your analysis,
-        # see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/customizing-your-advanced-setup-for-code-scanning.
-        # If you are analyzing a compiled language, you can modify the 'build-mode' for that language to customize how
-        # your codebase is analyzed, see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages
+          - language: actions
+            build-mode: none
+          - language: go
+            build-mode: autobuild
+          # CodeQL supports the following values keywords for 'language': 'actions', 'c-cpp', 'csharp', 'go', 'java-kotlin', 'javascript-typescript', 'python', 'ruby', 'swift'
+          # Use `c-cpp` to analyze code written in C, C++ or both
+          # Use 'java-kotlin' to analyze code written in Java, Kotlin or both
+          # Use 'javascript-typescript' to analyze code written in JavaScript, TypeScript or both
+          # To learn more about changing the languages that are analyzed or customizing the build mode for your analysis,
+          # see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/customizing-your-advanced-setup-for-code-scanning.
+          # If you are analyzing a compiled language, you can modify the 'build-mode' for that language to customize how
+          # your codebase is analyzed, see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages
     steps:
-    - name: Checkout repository
-      uses: actions/checkout@v5
+      - name: Checkout repository
+        uses: actions/checkout@v7
 
-    # Add any setup steps before running the `github/codeql-action/init` action.
-    # This includes steps like installing compilers or runtimes (`actions/setup-node`
-    # or others). This is typically only required for manual builds.
-    # - name: Setup runtime (example)
-    #   uses: actions/setup-example@v1
+      # Add any setup steps before running the `github/codeql-action/init` action.
+      # This includes steps like installing compilers or runtimes (`actions/setup-node`
+      # or others). This is typically only required for manual builds.
+      # - name: Setup runtime (example)
+      #   uses: actions/setup-example@v1
 
-    # Initializes the CodeQL tools for scanning.
-    - name: Initialize CodeQL
-      uses: github/codeql-action/init@v4
-      with:
-        languages: ${{ matrix.language }}
-        build-mode: ${{ matrix.build-mode }}
-        # If you wish to specify custom queries, you can do so here or in a config file.
-        # By default, queries listed here will override any specified in a config file.
-        # Prefix the list here with "+" to use these queries and those in the config file.
+      # Initializes the CodeQL tools for scanning.
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v4
+        with:
+          languages: ${{ matrix.language }}
+          build-mode: ${{ matrix.build-mode }}
+          # If you wish to specify custom queries, you can do so here or in a config file.
+          # By default, queries listed here will override any specified in a config file.
+          # Prefix the list here with "+" to use these queries and those in the config file.
 
-        # For more details on CodeQL's query packs, refer to: https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-code-scanning#using-queries-in-ql-packs
-        # queries: security-extended,security-and-quality
+          # For more details on CodeQL's query packs, refer to: https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-code-scanning#using-queries-in-ql-packs
+          # queries: security-extended,security-and-quality
 
-    # If the analyze step fails for one of the languages you are analyzing with
-    # "We were unable to automatically build your code", modify the matrix above
-    # to set the build mode to "manual" for that language. Then modify this step
-    # to build your code.
-    # ℹ️ Command-line programs to run using the OS shell.
-    # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
-    - if: matrix.build-mode == 'manual'
-      shell: bash
-      run: |
-        echo 'If you are using a "manual" build mode for one or more of the' \
-          'languages you are analyzing, replace this with the commands to build' \
-          'your code, for example:'
-        echo '  make bootstrap'
-        echo '  make release'
-        exit 1
+      # If the analyze step fails for one of the languages you are analyzing with
+      # "We were unable to automatically build your code", modify the matrix above
+      # to set the build mode to "manual" for that language. Then modify this step
+      # to build your code.
+      # ℹ️ Command-line programs to run using the OS shell.
+      # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
+      - if: matrix.build-mode == 'manual'
+        shell: bash
+        run: |
+          echo 'If you are using a "manual" build mode for one or more of the' \
+            'languages you are analyzing, replace this with the commands to build' \
+            'your code, for example:'
+          echo '  make bootstrap'
+          echo '  make release'
+          exit 1
 
-    - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v4
-      with:
-        category: "/language:${{matrix.language}}"
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v4
+        with:
+          category: "/language:${{matrix.language}}"

.github/workflows/dependency-review.yml

@@ -16,11 +16,11 @@ jobs:
   dependency-review:
     runs-on: ubuntu-latest
     steps:
-      - name: 'Checkout Repository'
-        uses: actions/checkout@v5
+      - name: "Checkout Repository"
+        uses: actions/checkout@v7
 
-      - name: 'Dependency Review'
-        uses: actions/dependency-review-action@v4
+      - name: "Dependency Review"
+        uses: actions/dependency-review-action@v5
         with:
           fail-on-severity: moderate
           comment-summary-in-pr: always

.github/workflows/release.yml

@@ -20,12 +20,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0
 
       - name: Set up Go
-        uses: actions/setup-go@v6
+        uses: actions/setup-go@v7
         with:
           go-version-file: "go.mod"
           check-latest: true
@@ -62,7 +62,7 @@ jobs:
           done
 
       - name: Create Release
-        uses: softprops/action-gh-release@v2
+        uses: softprops/action-gh-release@v3
         with:
           files: |
             build/articulate-parser-linux-amd64
@@ -82,36 +82,36 @@ jobs:
   docker:
     name: Docker Build & Push
     runs-on: ubuntu-latest
-    needs: ['release']
+    needs: ["release"]
     permissions:
       contents: read
       packages: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v7
 
       - name: Login to Docker Hub
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           username: ${{ vars.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Log in to GitHub Container Registry
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@v4
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Extract metadata
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: |
             ${{ env.IMAGE_NAME }}
@@ -131,7 +131,7 @@ jobs:
             org.opencontainers.image.documentation=https://github.com/${{ github.repository }}/blob/master/DOCKER.md
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           platforms: |

.gitignore

@@ -34,6 +34,8 @@ output/
 outputs/
 articulate-sample.json
 test-output.*
+# Example test exports (defensive; tests now write to a temp dir)
+internal/exporters/output.*
 go-os-arch-matrix.csv
 test_godocx.go
 test_input.json

.golangci.yml

@@ -1,6 +1,7 @@
+# yaml-language-server: $schema=https://golangci-lint.run/jsonschema/golangci.jsonschema.json
 # golangci-lint configuration for articulate-parser
 # https://golangci-lint.run/usage/configuration/
-
+---
 version: "2"
 
 # Options for analysis running
@@ -8,11 +9,6 @@ run:
   # Timeout for total work
   timeout: 5m
 
-  # Skip directories (not allowed in config v2, will use issues exclude instead)
-
-  # Go version
-  go: "1.24"
-
   # Include test files
   tests: true
 
@@ -56,6 +52,7 @@ formatters:
     - gofmt
     - goimports
     - gofumpt
+  exclusions: { paths: [".zed"] }
   settings:
     # gofmt settings
     gofmt:
@@ -79,68 +76,68 @@ linters:
   # Enable specific linters
   enable:
     # Default/standard linters
-    - errcheck      # Check for unchecked errors
-    - govet         # Go vet
-    - ineffassign   # Detect ineffectual assignments
-    - staticcheck   # Staticcheck
-    - unused        # Find unused code
+    - errcheck # Check for unchecked errors
+    - govet # Go vet
+    - ineffassign # Detect ineffectual assignments
+    - staticcheck # Staticcheck
+    - unused # Find unused code
 
     # Code quality
-    - revive        # Fast, configurable linter
-    - gocritic      # Opinionated Go source code linter
-    - godot         # Check comment periods
-    - godox         # Detect TODO/FIXME comments
-    - gocognit      # Cognitive complexity
-    - gocyclo       # Cyclomatic complexity
-    - funlen        # Function length
-    - maintidx      # Maintainability index
+    - revive # Fast, configurable linter
+    - gocritic # Opinionated Go source code linter
+    - godot # Check comment periods
+    - godox # Detect TODO/FIXME comments
+    - gocognit # Cognitive complexity
+    - gocyclo # Cyclomatic complexity
+    - funlen # Function length
+    - maintidx # Maintainability index
 
     # Security
-    - gosec         # Security problems
+    - gosec # Security problems
 
     # Performance
-    - prealloc      # Find slice preallocation opportunities
-    - bodyclose     # Check HTTP response body closed
+    - prealloc # Find slice preallocation opportunities
+    - bodyclose # Check HTTP response body closed
 
     # Style and formatting
-    - goconst       # Find repeated strings
-    - misspell      # Find misspellings
-    - whitespace    # Find unnecessary blank lines
-    - unconvert     # Remove unnecessary type conversions
-    - dupword       # Check for duplicate words
+    - goconst # Find repeated strings
+    - misspell # Find misspellings
+    - whitespace # Find unnecessary blank lines
+    - unconvert # Remove unnecessary type conversions
+    - dupword # Check for duplicate words
 
     # Error handling
-    - errorlint     # Error handling improvements
-    - wrapcheck     # Check error wrapping
+    - errorlint # Error handling improvements
+    - wrapcheck # Check error wrapping
 
     # Testing
-    - testifylint   # Testify usage
-    - tparallel     # Detect improper t.Parallel() usage
-    - thelper       # Detect test helpers without t.Helper()
+    - testifylint # Testify usage
+    - tparallel # Detect improper t.Parallel() usage
+    - thelper # Detect test helpers without t.Helper()
 
     # Best practices
-    - exhaustive    # Check exhaustiveness of enum switches
-    - nolintlint    # Check nolint directives
-    - nakedret      # Find naked returns
-    - nilnil        # Check for redundant nil checks
-    - noctx         # Check sending HTTP requests without context
-    - contextcheck  # Check context propagation
-    - asciicheck    # Check for non-ASCII identifiers
-    - bidichk       # Check for dangerous unicode sequences
+    - exhaustive # Check exhaustiveness of enum switches
+    - nolintlint # Check nolint directives
+    - nakedret # Find naked returns
+    - nilnil # Check for redundant nil checks
+    - noctx # Check sending HTTP requests without context
+    - contextcheck # Check context propagation
+    - asciicheck # Check for non-ASCII identifiers
+    - bidichk # Check for dangerous unicode sequences
     - durationcheck # Check for multiplied durations
-    - makezero      # Find slice declarations with non-zero length
-    - nilerr        # Find code returning nil with non-nil error
-    - predeclared   # Find code shadowing predeclared identifiers
-    - promlinter    # Check Prometheus metrics naming
-    - reassign      # Check reassignment of package variables
+    - makezero # Find slice declarations with non-zero length
+    - nilerr # Find code returning nil with non-nil error
+    - predeclared # Find code shadowing predeclared identifiers
+    - promlinter # Check Prometheus metrics naming
+    - reassign # Check reassignment of package variables
     - usestdlibvars # Use variables from stdlib
-    - wastedassign  # Find wasted assignments
+    - wastedassign # Find wasted assignments
 
     # Documentation
-    - godoclint     # Check godoc comments
+    - godoclint # Check godoc comments
 
     # New
-    - modernize     # Suggest simplifications using new Go features
+    - modernize # Suggest simplifications using new Go features
 
   # Exclusion rules for linters
   exclusions:
@@ -221,8 +218,8 @@ linters:
     govet:
       enable-all: true
       disable:
-        - fieldalignment  # Too many false positives
-        - shadow         # Can be noisy
+        - fieldalignment # Too many false positives
+        - shadow # Can be noisy
 
     # goconst settings
     goconst:
@@ -286,8 +283,8 @@ linters:
       severity: medium
       confidence: medium
       excludes:
-        - G104  # Handled by errcheck
-        - G304  # File path provided as taint input
+        - G104 # Handled by errcheck
+        - G304 # File path provided as taint input
 
     # revive settings
     revive:
@@ -349,7 +346,16 @@ linters:
 
     # stylecheck settings
     staticcheck:
-      checks: ["all", "-ST1000", "-ST1003", "-ST1016", "-ST1020", "-ST1021", "-ST1022"]
+      checks:
+        [
+          "all",
+          "-ST1000",
+          "-ST1003",
+          "-ST1016",
+          "-ST1020",
+          "-ST1021",
+          "-ST1022",
+        ]
 
     # maintidx settings
     maintidx:

.opencode/opencode.jsonc

@@ -0,0 +1,25 @@
+{
+	"$schema": "https://opencode.ai/config.json",
+	"lsp": {
+		"golangci-lint": {
+			"command": ["golangci-lint-langserver"],
+			"extensions": [".go"],
+			"initialization": {
+				"command": [
+					"golangci-lint",
+					"run",
+					"--output.json.path",
+					"stdout",
+					"--show-stats=false",
+					"--issues-exit-code=1",
+				],
+			},
+		},
+	},
+	"formatter": {
+		"dprint": {
+			"command": ["dprint", "fmt", "$FILE"],
+			"extensions": [".go", ".md", ".Dockerfile", ".Dockerfile.dev", ".md"],
+		},
+	},
+}

.pre-commit-config.yaml

@@ -9,7 +9,7 @@ repos:
         exclude: '^\.github/ISSUE_TEMPLATE/.*\.yml$'
       - id: end-of-file-fixer
       - id: mixed-line-ending
-        args: ['--fix=lf']
+        args: ["--fix=lf"]
 
       # File validation
       - id: check-yaml
@@ -23,7 +23,7 @@ repos:
       - id: check-merge-conflict
       - id: check-case-conflict
       - id: no-commit-to-branch
-        args: ['--branch=master', '--branch=main']
+        args: ["--branch=master", "--branch=main"]
 
       # File structure
       - id: check-added-large-files
@@ -31,16 +31,16 @@ repos:
       - id: check-executables-have-shebangs
   - repo: local
     hooks:
-    - id: actionlint
-      name: Lint GitHub Actions workflow files
-      description: Runs actionlint to lint GitHub Actions workflow files
-      language: golang
-      types: ["yaml"]
-      files: ^\.github/workflows/
-      entry: actionlint
-      minimum_pre_commit_version: 3.0.0
+      - id: actionlint
+        name: Lint GitHub Actions workflow files
+        description: Runs actionlint to lint GitHub Actions workflow files
+        language: golang
+        types: ["yaml"]
+        files: ^\.github/workflows/
+        entry: actionlint
+        minimum_pre_commit_version: 3.0.0
   - repo: https://github.com/golangci/golangci-lint
-    rev: v2.6.1
+    rev: v2.7.2
     hooks:
       - id: golangci-lint
         name: golangci-lint

.zed/settings.json

@@ -0,0 +1,40 @@
+{
+	"tab_size": 2,
+	"hard_tabs": true,
+	"prettier": { "allowed": false },
+	"formatter": [
+		{ "language_server": { "name": "dprint" } }
+	],
+	"languages": {
+		"Go": {
+			"language_servers": ["gopls", "golangci-lint-langserver", "..."]
+		}
+	},
+	"lsp": {
+		"gopls": {
+			"enable_lsp_tasks": true,
+			"initialization_options": {
+				"workspaceFiles": ["go.mod", "go.work", "*.go"]
+			}
+		},
+		"golangci-lint": {
+			"enable_lsp_tasks": false
+		},
+		"golangci-lint-langserver": {
+			"binary": {
+				"path": "golangci-lint-langserver",
+				"arguments": ["-debug"]
+			},
+			"initialization_options": {
+				"command": [
+					"golangci-lint",
+					"run",
+					"--output.json.path",
+					"stdout",
+					"--show-stats=false",
+					"--issues-exit-code=1"
+				]
+			}
+		}
+	}
+}

AGENTS.md

@@ -1,36 +1,87 @@
 # Agent Guidelines for articulate-parser
 
+A Go CLI tool that parses Articulate Rise courses from URLs or local JSON files and exports them to Markdown, HTML, or DOCX formats.
+
+## Repository Info
+
+- **GitHub**: https://github.com/kjanat/articulate-parser
+- **Default branch**: `master` (not `main`)
+
 ## Build/Test Commands
 
-- **Build**: `task build` or `go build -o bin/articulate-parser main.go`
-- **Run tests**: `task test` or `go test -race -timeout 5m ./...`
-- **Run single test**: `go test -v -race -run ^TestName$ ./path/to/package`
-- **Test with coverage**:
-  - `task test:coverage` or
-  - `go test -race -coverprofile=coverage/coverage.out -covermode=atomic ./...`
-- **Lint**: `task lint` (runs vet, fmt check, staticcheck, golangci-lint)
-- **Format**: `task fmt` or `gofmt -s -w .`
-- **CI checks**: `task ci` (deps, lint, test with coverage, build)
+### Primary Commands (using Taskfile)
+
+```bash
+task build              # Build binary to bin/articulate-parser
+task test               # Run all tests with race detection
+task lint               # Run all linters (vet, fmt, staticcheck, golangci-lint)
+task fmt                # Format all Go files
+task ci                 # Full CI pipeline: deps, lint, test with coverage, build
+task qa                 # Quick QA: fmt + lint + test
+```
+
+### Direct Go Commands
+
+```bash
+# Build
+go build -o bin/articulate-parser main.go
+
+# Run all tests
+go test -race -timeout 5m ./...
+
+# Run single test by name
+go test -v -race -run ^TestMarkdownExporter_Export$ ./internal/exporters
+
+# Run tests in specific package
+go test -v -race ./internal/services
+
+# Run tests matching pattern
+go test -v -race -run "TestParser" ./...
+
+# Test with coverage
+go test -race -coverprofile=coverage/coverage.out -covermode=atomic ./...
+go tool cover -html=coverage/coverage.out -o coverage/coverage.html
+
+# Benchmarks
+go test -bench=. -benchmem ./...
+go test -bench=BenchmarkMarkdownExporter ./internal/exporters
+```
+
+### Security & Auditing
+
+```bash
+task security:check     # Run gosec security scanner
+task security:audit     # Run govulncheck for vulnerabilities
+```
 
 ## Code Style Guidelines
 
 ### Imports
 
 - Use `goimports` with local prefix: `github.com/kjanat/articulate-parser`
-- Order: stdlib, external, internal packages
-- Group related imports together
+- Order: stdlib, blank line, external packages, blank line, internal packages
+
+```go
+import (
+    "context"
+    "fmt"
+
+    "github.com/fumiama/go-docx"
+
+    "github.com/kjanat/articulate-parser/internal/interfaces"
+)
+```
 
 ### Formatting
 
 - Use `gofmt -s` (simplify) and `gofumpt` with extra rules
 - Function length: max 100 lines, 50 statements
-- Cyclomatic complexity: max 15
-- Cognitive complexity: max 20
+- Cyclomatic complexity: max 15; Cognitive complexity: max 20
 
 ### Types & Naming
 
 - Use interface-based design (see `internal/interfaces/`)
-- Export types/functions with clear godoc comments ending with period
+- Exported types/functions require godoc comments ending with period
 - Use descriptive names: `ArticulateParser`, `MarkdownExporter`
 - Receiver names: short (1-2 chars), consistent per type
 
@@ -41,6 +92,20 @@
 - Check all error returns (enforced by `errcheck`)
 - Document error handling rationale in defer blocks when ignoring close errors
 
+```go
+// Good: Error wrapping with context
+if err := json.Unmarshal(body, &course); err != nil {
+    return nil, fmt.Errorf("failed to unmarshal JSON: %w", err)
+}
+
+// Good: Documented defer with error handling
+defer func() {
+    if err := resp.Body.Close(); err != nil {
+        p.Logger.Warn("failed to close response body", "error", err)
+    }
+}()
+```
+
 ### Comments
 
 - All exported types/functions require godoc comments
@@ -49,379 +114,70 @@
 
 ### Security
 
-- Use `#nosec` with justification for deliberate security exceptions (G304 for CLI file paths, G306 for export file permissions)
-- Run `gosec` and `govulncheck` for security audits
+- Use `#nosec` with justification for deliberate security exceptions
+- G304: File paths from CLI args; G306: Export file permissions
+
+```go
+// #nosec G304 - File path provided by user via CLI argument
+data, err := os.ReadFile(filePath)
+```
 
 ### Testing
 
-- Enable race detection: `-race` flag
+- Enable race detection: `-race` flag always
 - Use table-driven tests where applicable
 - Mark test helpers with `t.Helper()`
+- Use `t.TempDir()` for temporary files
 - Benchmarks in `*_bench_test.go`, examples in `*_example_test.go`
+- Test naming: `Test<Type>_<Method>` or `Test<Function>`
+
+```go
+func TestMarkdownExporter_ProcessItemToMarkdown_AllTypes(t *testing.T) {
+    tests := []struct {
+        name, itemType, expectedText string
+    }{
+        {"text item", "text", ""},
+        {"divider item", "divider", "---"},
+    }
+    for _, tt := range tests {
+        t.Run(tt.name, func(t *testing.T) {
+            // test implementation
+        })
+    }
+}
+```
 
 ### Dependencies
 
-- Minimal external dependencies (currently: go-docx, golang.org/x/net, golang.org/x/text)
+- Minimal external dependencies (go-docx, golang.org/x/net, golang.org/x/text)
 - Run `task deps:tidy` after adding/removing dependencies
+- CGO disabled by default (`CGO_ENABLED=0`)
 
----
+## Project Structure
 
-## Go 1.24 & 1.25 New Features Reference
+```
+articulate-parser/
+  internal/
+    config/              # Configuration loading
+    exporters/           # Export implementations (markdown, html, docx)
+    interfaces/          # Core interfaces (Exporter, CourseParser, Logger)
+    models/              # Data models (Course, Lesson, Item, Media)
+    services/            # Core services (parser, html cleaner, app, logger)
+    version/             # Version information
+  main.go                # Application entry point
+```
 
-This project uses Go 1.24+. Below is a comprehensive summary of new features and changes in Go 1.24 and 1.25 that may be relevant for development and maintenance.
+## Common Patterns
 
-### Go 1.24 Major Changes (Released February 2025)
+### Creating a new exporter
 
-#### Language Features
+1. Implement `interfaces.Exporter` interface
+2. Add factory method to `internal/exporters/factory.go`
+3. Register format in `NewFactory()`
+4. Add tests following existing patterns
 
-**Generic Type Aliases**
+### Adding configuration options
 
-- Type aliases can now be parameterized with type parameters
-- Example: `type List[T any] = []T`
-- Can be disabled via `GOEXPERIMENT=noaliastypeparams` (removed in 1.25)
-
-#### Tooling Enhancements
-
-**Module Tool Dependencies**
-
-- New `tool` directive in go.mod tracks executable dependencies
-- Use `go get -tool <package>` to add tool dependencies
-- Use `go install tool` and `go get tool` to manage them
-- Eliminates need for blank imports in `tools.go` files
-
-**Build Output Formatting**
-
-- Both `go build` and `go test` support `-json` flag for structured JSON output
-- New action types distinguish build output from test results
-
-**Authentication**
-
-- New `GOAUTH` environment variable provides flexible authentication for private modules
-
-**Automatic Version Tracking**
-
-- `go build` automatically sets main module version in binaries based on VCS tags
-- Adds `+dirty` suffix for uncommitted changes
-
-**Cgo Performance Improvements**
-
-- New `#cgo noescape` annotation: Prevents escape analysis overhead for C function calls
-- New `#cgo nocallback` annotation: Indicates C function won't call back to Go
-
-**Toolchain Tracing**
-
-- `GODEBUG=toolchaintrace=1` enables tracing of toolchain selection
-
-#### Runtime & Performance
-
-**Performance Improvements**
-
-- **2-3% CPU overhead reduction** across benchmark suites
-- New Swiss Tables-based map implementation (faster lookups)
-  - Disable via `GOEXPERIMENT=noswissmap`
-- More efficient small object allocation
-- Redesigned runtime-internal mutexes
-  - Disable via `GOEXPERIMENT=nospinbitmutex`
-
-#### Compiler & Linker
-
-**Method Receiver Restrictions**
-
-- Methods on cgo-generated types now prevented (both directly and through aliases)
-
-**Build IDs**
-
-- Linkers generate GNU build IDs (ELF) and UUIDs (macOS) by default
-- Disable via `-B none` flag
-
-#### Standard Library Additions
-
-**File System Safety - `os.Root`**
-
-- New `os.Root` type enables directory-limited operations
-- Prevents path escape and symlink breakouts
-- Essential for sandboxed file operations
-
-**Cryptography Expansion**
-
-- `crypto/mlkem`: ML-KEM-768/1024 post-quantum key exchange (FIPS 203)
-- `crypto/hkdf`: HMAC-based Extract-and-Expand KDF (RFC 5869)
-- `crypto/pbkdf2`: Password-based key derivation (RFC 8018)
-- `crypto/sha3`: SHA-3 and SHAKE functions (FIPS 202)
-
-**FIPS 140-3 Support**
-
-- New `GOFIPS140` environment variable enables FIPS mode
-- New `fips140` GODEBUG setting for cryptographic module compliance
-
-**Weak References - `weak` Package**
-
-- New `weak` package provides low-level weak pointers
-- Enables memory-efficient structures like weak maps and caches
-- Useful for preventing memory leaks in cache implementations
-
-**Testing Improvements**
-
-- `testing.B.Loop()`: Cleaner syntax replacing manual `b.N` iteration
-- Prevents compiler from optimizing away benchmarked code
-- New `testing/synctest` package (experimental) for testing concurrent code with fake clocks
-
-**Iterator Support**
-
-- Multiple packages now offer iterator-returning variants:
-  - `bytes`: Iterator-based functions
-  - `strings`: Iterator-based functions
-  - `go/types`: Iterator support
-
-#### Security Enhancements
-
-**TLS Post-Quantum Cryptography**
-
-- `X25519MLKEM768` hybrid key exchange enabled by default in TLS
-- Provides quantum-resistant security
-
-**Encrypted Client Hello (ECH)**
-
-- TLS servers can enable ECH via `Config.EncryptedClientHelloKeys`
-- Protects client identity during TLS handshake
-
-**RSA Key Validation**
-
-- Keys smaller than 1024 bits now rejected by default
-- Use `GODEBUG=rsa1024min=0` to revert (testing only)
-
-**Constant-Time Execution**
-
-- New `crypto/subtle.WithDataIndependentTiming()` enables architecture-specific timing guarantees
-- Helps prevent timing attacks
-
-#### Deprecations & Removals
-
-- `runtime.GOROOT()`: Deprecated; use system path instead
-- `crypto/cipher` OFB/CFB modes: Deprecated (unauthenticated encryption)
-- `x509sha1` GODEBUG: Removed; SHA-1 certificates no longer verified
-- Experimental `X25519Kyber768Draft00`: Removed
-
-#### Platform Changes
-
-- **Linux**: Now requires kernel 3.2+ (enforced)
-- **macOS**: Go 1.24 is final release supporting Big Sur
-- **Windows/ARM 32-bit**: Marked broken
-- **WebAssembly**:
-  - New `go:wasmexport` directive
-  - Reactor/library builds supported via `-buildmode=c-shared`
-
-#### Bootstrap Requirements
-
-- Go 1.24 requires Go 1.22.6+ for bootstrapping
-- Go 1.26 will require Go 1.24+
-
----
-
-### Go 1.25 Major Changes (Released August 2025)
-
-#### Language Changes
-
-- No breaking language changes
-- "Core types" concept removed from specification (replaced with clearer prose)
-
-#### Tooling Improvements
-
-**Go Command Enhancements**
-
-- `go build -asan`: Now defaults to leak detection at program exit
-- New `go.mod ignore` directive: Specify directories for go command to ignore
-- `go doc -http`: Starts documentation server and opens in browser
-- `go version -m -json`: Prints JSON-encoded BuildInfo structures
-- Module path resolution now supports subdirectories using `<meta>` syntax
-- New `work` package pattern matches all packages in work/workspace modules
-- Removed automatic toolchain line additions when updating `go` version
-
-**Vet Analyzers**
-
-- **"waitgroup"**: Detects misplaced `sync.WaitGroup.Add` calls
-- **"hostport"**: Warns against using `fmt.Sprintf` for constructing addresses
-  - Recommends `net.JoinHostPort` instead
-
-#### Runtime Enhancements
-
-**Container-Aware GOMAXPROCS**
-
-- Linux now respects cgroup CPU bandwidth limits
-- All OSes periodically update GOMAXPROCS if CPU availability changes
-- Disable via environment variables or GODEBUG settings
-- Critical for containerized applications
-
-**New Garbage Collector - "Green Tea GC"**
-
-- Experimental `GOEXPERIMENT=greenteagc` enables new GC
-- **10-40% reduction in garbage collection overhead**
-- Significant for GC-sensitive applications
-
-**Trace Flight Recorder**
-
-- New `runtime/trace.FlightRecorder` API
-- Captures execution traces in in-memory ring buffer
-- Essential for debugging rare events and production issues
-
-**Other Runtime Changes**
-
-- Simplified unhandled panic output
-- VMA names on Linux identify memory purpose (debugging aid)
-- New `SetDefaultGOMAXPROCS` function resets GOMAXPROCS to defaults
-
-#### Compiler Fixes & Improvements
-
-**Critical Nil Pointer Bug Fix**
-
-- Fixed Go 1.21 regression where nil pointer checks were incorrectly delayed
-- ⚠️ **May cause previously passing code to now panic** (correct behavior)
-- Review code for assumptions about delayed nil checks
-
-**DWARF5 Support**
-
-- Debug information now uses DWARF version 5
-- Reduces binary size and linking time
-- Better debugging experience
-
-**Faster Slices**
-
-- Expanded stack allocation for slice backing stores
-- Improved slice performance
-
-#### Linker
-
-- New `-funcalign=N` option specifies function entry alignment
-
-#### Standard Library Highlights
-
-**New Packages**
-
-1. **`testing/synctest`** (Promoted from Experimental)
-   - Concurrent code testing with virtualized time
-   - Control time progression in tests
-   - Essential for testing time-dependent concurrent code
-
-2. **`encoding/json/v2`** (Experimental)
-   - **Substantially better decoding performance**
-   - Improved API design
-   - Backward compatible with v1
-
-**Major Package Updates**
-
-| Package | Key Changes |
-|---------|------------|
-| `crypto` | New `MessageSigner` interface and `SignMessage` function |
-| `crypto/ecdsa` | New raw key parsing/serialization functions |
-| `crypto/rsa` | **Key generation now 3x faster** |
-| `crypto/sha1` | **Hashing 2x faster on amd64 with SHA-NI** |
-| `crypto/tls` | New `CurveID` field; SHA-1 algorithms disallowed in TLS 1.2 |
-| `net` | Windows now supports file-to-connection conversion; IPv6 multicast improvements |
-| `net/http` | **New `CrossOriginProtection` middleware for CSRF defense** |
-| `os` | Windows async I/O support; `Root` type expanded with 12 new methods |
-| `sync` | **New `WaitGroup.Go` method for convenient goroutine creation** |
-| `testing` | New `Attr`, `Output` methods; `AllocsPerRun` panics with parallel tests |
-| `unique` | More eager and parallel reclamation of interned values |
-
-#### Performance Notes
-
-**Performance Improvements**
-
-- ECDSA and Ed25519 signing **4x faster** in FIPS 140-3 mode
-- SHA3 hashing **2x faster** on Apple M processors
-- AMD64 fused multiply-add instructions in v3+ mode
-  - ⚠️ **Changes floating-point results** (within IEEE 754 spec)
-
-**Performance Regressions**
-
-- SHA-1, SHA-256, SHA-512 slower without AVX2
-  - Most servers post-2015 support AVX2
-
-#### Platform Changes
-
-- **macOS**: Requires version 12 Monterey or later
-- **Windows**: 32-bit windows/arm port marked for removal in Go 1.26
-- **Loong64**: Race detector now supported
-- **RISC-V**:
-  - Plugin build mode support
-  - New `GORISCV64=rva23u64` environment variable value
-
-#### Deprecations
-
-- `go/ast` functions: `FilterPackage`, `PackageExports`, `MergePackageFiles`
-- `go/parser.ParseDir` function
-- Old `testing/synctest` API (when `GOEXPERIMENT=synctest` set)
-
----
-
-### Actionable Recommendations for This Project
-
-#### Immediate Opportunities
-
-1. **Replace `sync.WaitGroup` patterns with `WaitGroup.Go()`** (Go 1.25)
-
-   ```go
-   // Old pattern
-   wg.Add(1)
-   go func() {
-       defer wg.Done()
-       // work
-   }()
-   
-   // New pattern (Go 1.25)
-   wg.Go(func() {
-       // work
-   })
-   ```
-
-2. **Use `testing.B.Loop()` in benchmarks** (Go 1.24)
-
-   ```go
-   // Old pattern
-   for i := 0; i < b.N; i++ {
-       // benchmark code
-   }
-   
-   // New pattern (Go 1.24)
-   for b.Loop() {
-       // benchmark code
-   }
-   ```
-
-3. **Consider `os.Root` for file operations** (Go 1.24)
-   - Prevents path traversal vulnerabilities
-   - Safer for user-provided file paths
-
-4. **Enable Green Tea GC for testing** (Go 1.25)
-   - Test with `GOEXPERIMENT=greenteagc`
-   - May reduce GC overhead by 10-40%
-
-5. **Leverage container-aware GOMAXPROCS** (Go 1.25)
-   - No changes needed; automatic in containers
-   - Improves resource utilization
-
-6. **Review floating-point operations** (Go 1.25)
-   - AMD64 v3+ uses FMA instructions
-   - May change floating-point results (within spec)
-
-7. **Watch nil pointer checks** (Go 1.25)
-   - Compiler bug fix may expose latent nil pointer bugs
-   - Review crash reports carefully
-
-#### Future Considerations
-
-1. **Evaluate `encoding/json/v2`** when stable
-   - Better performance for JSON operations
-   - Currently experimental in Go 1.25
-
-2. **Adopt tool directives** in go.mod
-   - Cleaner dependency management for build tools
-   - Remove `tools.go` if present
-
-3. **Enable FIPS mode if required**
-   - Use `GOFIPS140=1` for compliance
-   - Performance improvements in Go 1.25 (4x faster signing)
-
-4. **Use `runtime/trace.FlightRecorder`** for production debugging
-   - Capture traces of rare events
-   - Minimal overhead when not triggered
+1. Add field to `Config` struct in `internal/config/config.go`
+2. Load from environment variable with sensible default
+3. Document in config struct comments

Dockerfile

@@ -1,5 +1,5 @@
 # Build stage
-FROM golang:1.25-alpine AS builder
+FROM golang:1.27-alpine AS builder
 
 # Install git and ca-certificates (needed for fetching dependencies and HTTPS)
 RUN apk add --no-cache git ca-certificates tzdata file

Dockerfile.dev

@@ -2,7 +2,7 @@
 # Uses Alpine instead of scratch for debugging
 
 # Build stage - same as production
-FROM golang:1.25-alpine AS builder
+FROM golang:1.27-alpine AS builder
 
 # Install git and ca-certificates (needed for fetching dependencies and HTTPS)
 RUN apk add --no-cache git ca-certificates tzdata file

README.md

@@ -78,12 +78,12 @@ flowchart TD
 
 The system follows **Clean Architecture** principles with clear separation of concerns:
 
-- **🎯 Entry Point**: Command-line interface handles user input and coordinates operations
-- **🏗️ Application Layer**: Core business logic with dependency injection
-- **📋 Interface Layer**: Contracts defining behavior without implementation details
-- **🔧 Service Layer**: Concrete implementations of parsing and utility services
-- **📤 Export Layer**: Factory pattern for format-specific exporters
-- **📊 Data Layer**: Domain models representing course structure
+- **Entry Point**: Command-line interface handles user input and coordinates operations
+- **Application Layer**: Core business logic with dependency injection
+- **Interface Layer**: Contracts defining behavior without implementation details
+- **Service Layer**: Concrete implementations of parsing and utility services
+- **Export Layer**: Factory pattern for format-specific exporters
+- **Data Layer**: Domain models representing course structure
 
 ## Features
 
@@ -206,7 +206,7 @@ Then run:
 
 The application is available as a Docker image from GitHub Container Registry.
 
-### 🐳 Docker Image Information
+### Docker Image Information
 
 - **Registry**: `ghcr.io/kjanat/articulate-parser`
 - **Platforms**: linux/amd64, linux/arm64
@@ -225,14 +225,14 @@ docker run --rm ghcr.io/kjanat/articulate-parser:latest --help
 
 ### Available Tags
 
-| Tag | Description | Use Case |
-|-----|-------------|----------|
-| `latest` | Latest stable release from master branch | Production use |
-| `edge` | Latest development build from master branch | Testing new features |
-| `v1.x.x` | Specific version releases | Production pinning |
-| `develop` | Development branch builds | Development/testing |
-| `feature/docker-ghcr` | Feature branch builds | Feature testing |
-| `master` | Latest master branch build | Continuous integration |
+| Tag                   | Description                                 | Use Case               |
+| --------------------- | ------------------------------------------- | ---------------------- |
+| `latest`              | Latest stable release from master branch    | Production use         |
+| `edge`                | Latest development build from master branch | Testing new features   |
+| `v1.x.x`              | Specific version releases                   | Production pinning     |
+| `develop`             | Development branch builds                   | Development/testing    |
+| `feature/docker-ghcr` | Feature branch builds                       | Feature testing        |
+| `master`              | Latest master branch build                  | Continuous integration |
 
 ### Usage Examples
 
@@ -313,11 +313,11 @@ docker build --build-arg VERSION=local --build-arg BUILD_TIME=$(date -u +%Y-%m-%
 
 The Docker image supports the following build-time arguments:
 
-| Argument | Description | Default |
-|----------|-------------|---------|
-| `VERSION` | Version string embedded in the binary | `dev` |
-| `BUILD_TIME` | Build timestamp | Current time |
-| `GIT_COMMIT` | Git commit hash | Current commit |
+| Argument     | Description                           | Default        |
+| ------------ | ------------------------------------- | -------------- |
+| `VERSION`    | Version string embedded in the binary | `dev`          |
+| `BUILD_TIME` | Build timestamp                       | Current time   |
+| `GIT_COMMIT` | Git commit hash                       | Current commit |
 
 ### Docker Security
 
@@ -441,12 +441,12 @@ The parser includes error handling for:
 
 Potential improvements could include:
 
-- [ ]  PDF export support
-- [ ]  Media file downloading
-- [x]  ~~HTML export with preserved styling~~
-- [ ]  SCORM package support
-- [ ]  Batch processing capabilities
-- [ ]  Custom template support
+- [ ] PDF export support
+- [ ] Media file downloading
+- [x] ~~HTML export with preserved styling~~
+- [ ] SCORM package support
+- [ ] Batch processing capabilities
+- [ ] Custom template support
 
 ## License
 
@@ -460,7 +460,9 @@ This is a utility tool for educational content conversion. Please ensure you hav
 [Go report]: https://goreportcard.com/report/github.com/kjanat/articulate-parser
 [gomod]: go.mod
 [Issues]: https://github.com/kjanat/articulate-parser/issues
+
 <!-- [Latest release]: https://github.com/kjanat/articulate-parser/releases/latest -->
+
 [MIT License]: LICENSE
 [Package documentation]: https://godoc.org/github.com/kjanat/articulate-parser
 [Tags]: https://github.com/kjanat/articulate-parser/tags

Taskfile.yml

@@ -1,7 +1,7 @@
 # yaml-language-server: $schema=https://taskfile.dev/schema.json
 # Articulate Parser - Task Automation
 # https://taskfile.dev
-version: '3'
+version: "3"
 
 # Global output settings
 output: prefixed
@@ -47,11 +47,11 @@ vars:
 
 # Environment variables
 env:
-  CGO_ENABLED: '{{.CGO_ENABLED}}'
+  CGO_ENABLED: "{{.CGO_ENABLED}}"
   GO111MODULE: on
 
 # Load .env files if present
-dotenv: ['.env', '.env.local']
+dotenv: [".env", ".env.local"]
 
 # Task definitions
 tasks:
@@ -69,12 +69,12 @@ tasks:
     interactive: true
     watch: true
     sources:
-      - '**/*.go'
+      - "**/*.go"
       - go.mod
       - go.sum
     cmds:
       - task: build
-      - '{{.OUTPUT_DIR}}/{{.APP_NAME}}{{.EXE_EXT}} --help'
+      - "{{.OUTPUT_DIR}}/{{.APP_NAME}}{{.EXE_EXT}} --help"
 
   # Build tasks
   build:
@@ -82,14 +82,14 @@ tasks:
     aliases: [b]
     deps: [clean-bin]
     sources:
-      - '**/*.go'
+      - "**/*.go"
       - go.mod
       - go.sum
     generates:
-      - '{{.OUTPUT_DIR}}/{{.APP_NAME}}{{.EXE_EXT}}'
+      - "{{.OUTPUT_DIR}}/{{.APP_NAME}}{{.EXE_EXT}}"
     cmds:
       - task: mkdir
-        vars: { DIR: '{{.OUTPUT_DIR}}' }
+        vars: { DIR: "{{.OUTPUT_DIR}}" }
       - go build {{.GO_FLAGS}} -ldflags="{{.LDFLAGS}}" -o {{.OUTPUT_DIR}}/{{.APP_NAME}}{{.EXE_EXT}} {{.MAIN_FILE}}
     method: checksum
 
@@ -99,25 +99,25 @@ tasks:
     deps: [clean-bin]
     cmds:
       - task: mkdir
-        vars: { DIR: '{{.OUTPUT_DIR}}' }
+        vars: { DIR: "{{.OUTPUT_DIR}}" }
       - for:
           matrix:
             GOOS: [linux, darwin, windows]
             GOARCH: [amd64, arm64]
         task: build:platform
         vars:
-          TARGET_GOOS: '{{.ITEM.GOOS}}'
-          TARGET_GOARCH: '{{.ITEM.GOARCH}}'
+          TARGET_GOOS: "{{.ITEM.GOOS}}"
+          TARGET_GOARCH: "{{.ITEM.GOARCH}}"
       - echo "Built binaries for all platforms in {{.OUTPUT_DIR}}/"
 
   build:platform:
     internal: true
     vars:
       TARGET_EXT: '{{if eq .TARGET_GOOS "windows"}}.exe{{end}}'
-      OUTPUT_FILE: '{{.OUTPUT_DIR}}/{{.APP_NAME}}-{{.TARGET_GOOS}}-{{.TARGET_GOARCH}}{{.TARGET_EXT}}'
+      OUTPUT_FILE: "{{.OUTPUT_DIR}}/{{.APP_NAME}}-{{.TARGET_GOOS}}-{{.TARGET_GOARCH}}{{.TARGET_EXT}}"
     env:
-      GOOS: '{{.TARGET_GOOS}}'
-      GOARCH: '{{.TARGET_GOARCH}}'
+      GOOS: "{{.TARGET_GOOS}}"
+      GOARCH: "{{.TARGET_GOARCH}}"
     cmds:
       - echo "Building {{.OUTPUT_FILE}}..."
       - go build {{.GO_FLAGS}} -ldflags="{{.LDFLAGS}}" -o "{{.OUTPUT_FILE}}" {{.MAIN_FILE}}
@@ -134,6 +134,8 @@ tasks:
   test:
     desc: Run all tests
     aliases: [t]
+    env:
+      CGO_ENABLED: 1
     cmds:
       - go test {{.GO_FLAGS}} -race -timeout {{.TEST_TIMEOUT}} ./...
 
@@ -141,9 +143,11 @@ tasks:
     desc: Run tests with coverage report
     aliases: [cover, cov]
     deps: [clean-coverage]
+    env:
+      CGO_ENABLED: 1
     cmds:
       - task: mkdir
-        vars: { DIR: '{{.COVERAGE_DIR}}' }
+        vars: { DIR: "{{.COVERAGE_DIR}}" }
       - go test {{.GO_FLAGS}} -race -coverprofile={{.COVERAGE_DIR}}/coverage.out -covermode=atomic -timeout {{.TEST_TIMEOUT}} ./...
       - go tool cover -html={{.COVERAGE_DIR}}/coverage.out -o {{.COVERAGE_DIR}}/coverage.html
       - go tool cover -func={{.COVERAGE_DIR}}/coverage.out
@@ -152,6 +156,8 @@ tasks:
   test:verbose:
     desc: Run tests with verbose output
     aliases: [tv]
+    env:
+      CGO_ENABLED: 1
     cmds:
       - go test -v -race -timeout {{.TEST_TIMEOUT}} ./...
 
@@ -160,7 +166,7 @@ tasks:
     aliases: [tw]
     watch: true
     sources:
-      - '**/*.go'
+      - "**/*.go"
     cmds:
       - task: test
 
@@ -172,6 +178,8 @@ tasks:
 
   test:integration:
     desc: Run integration tests
+    env:
+      CGO_ENABLED: 1
     status:
       - '{{if eq OS "windows"}}if not exist "main_test.go" exit 1{{else}}test ! -f "main_test.go"{{end}}'
     cmds:
@@ -316,13 +324,13 @@ tasks:
   docker:run:
     desc: Run Docker container
     aliases: [dr]
-    deps: ['docker:build']
+    deps: [docker:build]
     cmds:
       - docker run --rm {{.APP_NAME}}:{{.VERSION}} --help
 
   docker:test:
     desc: Test Docker image
-    deps: ['docker:build']
+    deps: [docker:build]
     cmds:
       - docker run --rm {{.APP_NAME}}:{{.VERSION}} --version
       - echo "Docker image tested successfully"
@@ -352,14 +360,14 @@ tasks:
     internal: true
     cmds:
       - task: rmdir
-        vars: { DIR: '{{.OUTPUT_DIR}}' }
+        vars: { DIR: "{{.OUTPUT_DIR}}" }
 
   clean-coverage:
     desc: Remove coverage files
     internal: true
     cmds:
       - task: rmdir
-        vars: { DIR: '{{.COVERAGE_DIR}}' }
+        vars: { DIR: "{{.COVERAGE_DIR}}" }
 
   clean-cache:
     desc: Clean Go build and test cache
@@ -410,10 +418,10 @@ tasks:
     requires:
       vars: [VERSION]
     preconditions:
-      - sh: 'git diff --exit-code'
-        msg: 'Working directory is not clean'
-      - sh: 'git diff --cached --exit-code'
-        msg: 'Staging area is not clean'
+      - sh: "git diff --exit-code"
+        msg: "Working directory is not clean"
+      - sh: "git diff --cached --exit-code"
+        msg: "Staging area is not clean"
     cmds:
       - git tag -a v{{.VERSION}} -m "Release v{{.VERSION}}"
       - echo "Tagged v{{.VERSION}}"
@@ -434,7 +442,7 @@ tasks:
 
   docs:coverage:
     desc: Open coverage report in browser
-    deps: ['test:coverage']
+    deps: [test:coverage]
     cmds:
       - '{{if eq OS "darwin"}}open {{.COVERAGE_DIR}}/coverage.html{{else if eq OS "windows"}}start {{.COVERAGE_DIR}}/coverage.html{{else}}xdg-open {{.COVERAGE_DIR}}/coverage.html 2>/dev/null || echo "Please open {{.COVERAGE_DIR}}/coverage.html in your browser"{{end}}'
 
@@ -498,11 +506,11 @@ tasks:
       - '{{if eq OS "windows"}}if not exist "articulate-sample.json" exit 1{{else}}test ! -f "articulate-sample.json"{{end}}'
     deps: [build]
     cmds:
-      - '{{.OUTPUT_DIR}}/{{.APP_NAME}}{{.EXE_EXT}} articulate-sample.json md output-demo.md'
+      - "{{.OUTPUT_DIR}}/{{.APP_NAME}}{{.EXE_EXT}} articulate-sample.json md output-demo.md"
       - echo "Demo Markdown created{{:}} output-demo.md"
       - defer:
           task: rmfile
-          vars: { FILE: 'output-demo.md' }
+          vars: { FILE: "output-demo.md" }
 
   demo:html:
     desc: Demo - Convert sample to HTML
@@ -510,11 +518,11 @@ tasks:
       - '{{if eq OS "windows"}}if not exist "articulate-sample.json" exit 1{{else}}test ! -f "articulate-sample.json"{{end}}'
     deps: [build]
     cmds:
-      - '{{.OUTPUT_DIR}}/{{.APP_NAME}}{{.EXE_EXT}} articulate-sample.json html output-demo.html'
+      - "{{.OUTPUT_DIR}}/{{.APP_NAME}}{{.EXE_EXT}} articulate-sample.json html output-demo.html"
       - echo "Demo HTML created{{:}} output-demo.html"
       - defer:
           task: rmfile
-          vars: { FILE: 'output-demo.html' }
+          vars: { FILE: "output-demo.html" }
 
   demo:docx:
     desc: Demo - Convert sample to DOCX
@@ -522,11 +530,11 @@ tasks:
       - '{{if eq OS "windows"}}if not exist "articulate-sample.json" exit 1{{else}}test ! -f "articulate-sample.json"{{end}}'
     deps: [build]
     cmds:
-      - '{{.OUTPUT_DIR}}/{{.APP_NAME}}{{.EXE_EXT}} articulate-sample.json docx output-demo.docx'
+      - "{{.OUTPUT_DIR}}/{{.APP_NAME}}{{.EXE_EXT}} articulate-sample.json docx output-demo.docx"
       - echo "Demo DOCX created{{:}} output-demo.docx"
       - defer:
           task: rmfile
-          vars: { FILE: 'output-demo.docx' }
+          vars: { FILE: "output-demo.docx" }
 
   # Performance profiling
   profile:cpu:
@@ -536,7 +544,7 @@ tasks:
       - go tool pprof -http=:8080 cpu.prof
       - defer:
           task: rmfile
-          vars: { FILE: 'cpu.prof' }
+          vars: { FILE: "cpu.prof" }
 
   profile:mem:
     desc: Run memory profiling
@@ -545,14 +553,14 @@ tasks:
       - go tool pprof -http=:8080 mem.prof
       - defer:
           task: rmfile
-          vars: { FILE: 'mem.prof' }
+          vars: { FILE: "mem.prof" }
 
   # Git hooks
   hooks:install:
     desc: Install git hooks
     cmds:
       - task: mkdir
-        vars: { DIR: '.git/hooks' }
+        vars: { DIR: ".git/hooks" }
       - '{{if eq OS "windows"}}echo "#!/bin/sh" > .git/hooks/pre-commit && echo "task lint:fmt" >> .git/hooks/pre-commit{{else}}cat > .git/hooks/pre-commit << ''EOF''{{printf "\n"}}#!/bin/sh{{printf "\n"}}task lint:fmt{{printf "\n"}}EOF{{printf "\n"}}chmod +x .git/hooks/pre-commit{{end}}'
       - echo "Git hooks installed"
 

go.mod

@@ -1,14 +1,14 @@
 module github.com/kjanat/articulate-parser
 
-go 1.24.0
+go 1.26.0
 
 require (
 	github.com/fumiama/go-docx v0.0.0-20250506085032-0c30fd09304b
-	golang.org/x/net v0.46.0
-	golang.org/x/text v0.30.0
+	golang.org/x/net v0.59.0
+	golang.org/x/text v0.42.0
 )
 
 require (
 	github.com/fumiama/imgsz v0.0.4 // indirect
-	golang.org/x/image v0.32.0 // indirect
+	golang.org/x/image v0.42.0 // indirect
 )

go.sum

@@ -2,9 +2,9 @@ github.com/fumiama/go-docx v0.0.0-20250506085032-0c30fd09304b h1:/mxSugRc4SgN7Xg
 github.com/fumiama/go-docx v0.0.0-20250506085032-0c30fd09304b/go.mod h1:ssRF0IaB1hCcKIObp3FkZOsjTcAHpgii70JelNb4H8M=
 github.com/fumiama/imgsz v0.0.4 h1:Lsasu2hdSSFS+vnD+nvR1UkiRMK7hcpyYCC0FzgSMFI=
 github.com/fumiama/imgsz v0.0.4/go.mod h1:bISOQVTlw9sRytPwe8ir7tAaEmyz9hSNj9n8mXMBG0E=
-golang.org/x/image v0.32.0 h1:6lZQWq75h7L5IWNk0r+SCpUJ6tUVd3v4ZHnbRKLkUDQ=
-golang.org/x/image v0.32.0/go.mod h1:/R37rrQmKXtO6tYXAjtDLwQgFLHmhW+V6ayXlxzP2Pc=
-golang.org/x/net v0.46.0 h1:giFlY12I07fugqwPuWJi68oOnpfqFnJIJzaIIm2JVV4=
-golang.org/x/net v0.46.0/go.mod h1:Q9BGdFy1y4nkUwiLvT5qtyhAnEHgnQ/zd8PfU6nc210=
-golang.org/x/text v0.30.0 h1:yznKA/E9zq54KzlzBEAWn1NXSQ8DIp/NYMy88xJjl4k=
-golang.org/x/text v0.30.0/go.mod h1:yDdHFIX9t+tORqspjENWgzaCVXgk0yYnYuSZ8UzzBVM=
+golang.org/x/image v0.42.0 h1:1gSs6ehNWXLbkHBIPcWztk3D/6aIA/8hauiAYtlodVY=
+golang.org/x/image v0.42.0/go.mod h1:rrpelvGFt+kLPAjPM4HeWPgrl0FtafueU//e5N0qk/Q=
+golang.org/x/net v0.59.0 h1:5zfYln+w5XCxwrnMMJPufRgNoXEaGxl0wo5GqPXyues=
+golang.org/x/net v0.59.0/go.mod h1:2DA/G1UfVbCpQPeWTmMPGY7Cs2PkBkwu743bVX5PIVg=
+golang.org/x/text v0.42.0 h1:JbOZXgfeCPU9gacVtYliJqOhD+zhrEqK4LfdpmlUZqI=
+golang.org/x/text v0.42.0/go.mod h1:ojzP1Z+2QtioaF8DTtO8K5q7JWVVYwZKenzujK0Zd0E=

internal/apperrors/errors.go

@@ -0,0 +1,28 @@
+// Package apperrors provides sentinel errors for the articulate-parser application.
+package apperrors
+
+import "errors"
+
+// Export errors.
+var (
+	// ErrUnsupportedFormat is returned when an unknown export format is requested.
+	ErrUnsupportedFormat = errors.New("unsupported export format")
+)
+
+// URI parsing errors.
+var (
+	// ErrInvalidURI is returned when a URI cannot be parsed.
+	ErrInvalidURI = errors.New("invalid URI")
+
+	// ErrInvalidDomain is returned when the URI domain is not an Articulate Rise domain.
+	ErrInvalidDomain = errors.New("invalid domain for Articulate Rise URI")
+
+	// ErrNoShareID is returned when a share ID cannot be extracted from the URI.
+	ErrNoShareID = errors.New("could not extract share ID from URI")
+)
+
+// Operation errors.
+var (
+	// ErrOperationCanceled is returned when an operation is canceled via context.
+	ErrOperationCanceled = errors.New("operation canceled")
+)

internal/apperrors/errors_test.go

@@ -0,0 +1,50 @@
+package apperrors
+
+import (
+	"errors"
+	"fmt"
+	"testing"
+)
+
+func TestSentinelErrors_Unwrap(t *testing.T) {
+	tests := []struct {
+		name     string
+		sentinel error
+		wrapped  error
+	}{
+		{"ErrUnsupportedFormat", ErrUnsupportedFormat, fmt.Errorf("%w: xyz", ErrUnsupportedFormat)},
+		{"ErrInvalidURI", ErrInvalidURI, fmt.Errorf("%w: bad", ErrInvalidURI)},
+		{"ErrInvalidDomain", ErrInvalidDomain, fmt.Errorf("%w: evil.com", ErrInvalidDomain)},
+		{"ErrNoShareID", ErrNoShareID, fmt.Errorf("%w: no match", ErrNoShareID)},
+		{"ErrOperationCanceled", ErrOperationCanceled, fmt.Errorf("%w: ctx done", ErrOperationCanceled)},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if !errors.Is(tt.wrapped, tt.sentinel) {
+				t.Errorf("errors.Is(%v, %v) = false, want true", tt.wrapped, tt.sentinel)
+			}
+		})
+	}
+}
+
+func TestSentinelErrors_Message(t *testing.T) {
+	tests := []struct {
+		err      error
+		expected string
+	}{
+		{ErrUnsupportedFormat, "unsupported export format"},
+		{ErrInvalidURI, "invalid URI"},
+		{ErrInvalidDomain, "invalid domain for Articulate Rise URI"},
+		{ErrNoShareID, "could not extract share ID from URI"},
+		{ErrOperationCanceled, "operation canceled"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.expected, func(t *testing.T) {
+			if tt.err.Error() != tt.expected {
+				t.Errorf("got %q, want %q", tt.err.Error(), tt.expected)
+			}
+		})
+	}
+}

internal/exporters/base.go

@@ -0,0 +1,20 @@
+package exporters
+
+import "github.com/kjanat/articulate-parser/internal/interfaces"
+
+// baseExporter contains common fields shared by all exporter implementations.
+// Embed this struct in concrete exporters to inherit HTMLCleaner and Logger.
+type baseExporter struct {
+	// htmlCleaner is used to convert HTML content to plain text.
+	htmlCleaner interfaces.HTMLCleaner
+	// logger is used for logging warnings and errors.
+	logger interfaces.Logger
+}
+
+// newBaseExporter creates a new baseExporter with the given dependencies.
+func newBaseExporter(htmlCleaner interfaces.HTMLCleaner, logger interfaces.Logger) baseExporter {
+	return baseExporter{
+		htmlCleaner: htmlCleaner,
+		logger:      logger,
+	}
+}

internal/exporters/bench_test.go

@@ -6,12 +6,13 @@ import (
 
 	"github.com/kjanat/articulate-parser/internal/models"
 	"github.com/kjanat/articulate-parser/internal/services"
+	"github.com/kjanat/articulate-parser/internal/testdata"
 )
 
 // BenchmarkFactory_CreateExporter_Markdown benchmarks markdown exporter creation.
 func BenchmarkFactory_CreateExporter_Markdown(b *testing.B) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	b.ResetTimer()
 	for b.Loop() {
@@ -22,7 +23,7 @@ func BenchmarkFactory_CreateExporter_Markdown(b *testing.B) {
 // BenchmarkFactory_CreateExporter_All benchmarks creating all exporter types.
 func BenchmarkFactory_CreateExporter_All(b *testing.B) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 	formats := []string{"markdown", "docx", "html"}
 
 	b.ResetTimer()
@@ -36,15 +37,15 @@ func BenchmarkFactory_CreateExporter_All(b *testing.B) {
 // BenchmarkAllExporters_Export benchmarks all exporters with the same course.
 func BenchmarkAllExporters_Export(b *testing.B) {
 	htmlCleaner := services.NewHTMLCleaner()
-	course := createBenchmarkCourse()
+	course := testdata.BasicCourse()
 
 	exporters := map[string]struct {
 		exporter any
 		ext      string
 	}{
-		"Markdown": {NewMarkdownExporter(htmlCleaner), ".md"},
-		"Docx":     {NewDocxExporter(htmlCleaner), ".docx"},
-		"HTML":     {NewHTMLExporter(htmlCleaner), ".html"},
+		"Markdown": {NewMarkdownExporter(htmlCleaner, nil), ".md"},
+		"Docx":     {NewDocxExporter(htmlCleaner, nil), ".docx"},
+		"HTML":     {NewHTMLExporter(htmlCleaner, nil), ".html"},
 	}
 
 	for name, exp := range exporters {
@@ -66,10 +67,10 @@ func BenchmarkAllExporters_Export(b *testing.B) {
 // BenchmarkExporters_LargeCourse benchmarks exporters with large course data.
 func BenchmarkExporters_LargeCourse(b *testing.B) {
 	htmlCleaner := services.NewHTMLCleaner()
-	course := createLargeBenchmarkCourse()
+	course := testdata.LargeCourse(50)
 
 	b.Run("Markdown_Large", func(b *testing.B) {
-		exporter := NewMarkdownExporter(htmlCleaner)
+		exporter := NewMarkdownExporter(htmlCleaner, nil)
 		tempDir := b.TempDir()
 
 		b.ResetTimer()
@@ -80,7 +81,7 @@ func BenchmarkExporters_LargeCourse(b *testing.B) {
 	})
 
 	b.Run("Docx_Large", func(b *testing.B) {
-		exporter := NewDocxExporter(htmlCleaner)
+		exporter := NewDocxExporter(htmlCleaner, nil)
 		tempDir := b.TempDir()
 
 		b.ResetTimer()
@@ -91,7 +92,7 @@ func BenchmarkExporters_LargeCourse(b *testing.B) {
 	})
 
 	b.Run("HTML_Large", func(b *testing.B) {
-		exporter := NewHTMLExporter(htmlCleaner)
+		exporter := NewHTMLExporter(htmlCleaner, nil)
 		tempDir := b.TempDir()
 
 		b.ResetTimer()
@@ -101,100 +102,3 @@ func BenchmarkExporters_LargeCourse(b *testing.B) {
 		}
 	})
 }
-
-// createBenchmarkCourse creates a standard-sized course for benchmarking.
-func createBenchmarkCourse() *models.Course {
-	return &models.Course{
-		ShareID: "benchmark-id",
-		Author:  "Benchmark Author",
-		Course: models.CourseInfo{
-			ID:             "bench-course",
-			Title:          "Benchmark Course",
-			Description:    "Performance testing course",
-			NavigationMode: "menu",
-			Lessons: []models.Lesson{
-				{
-					ID:    "lesson1",
-					Title: "Introduction",
-					Type:  "lesson",
-					Items: []models.Item{
-						{
-							Type: "text",
-							Items: []models.SubItem{
-								{
-									Heading:   "Welcome",
-									Paragraph: "<p>This is a test paragraph with <strong>HTML</strong> content.</p>",
-								},
-							},
-						},
-						{
-							Type: "list",
-							Items: []models.SubItem{
-								{Paragraph: "Item 1"},
-								{Paragraph: "Item 2"},
-								{Paragraph: "Item 3"},
-							},
-						},
-					},
-				},
-			},
-		},
-	}
-}
-
-// createLargeBenchmarkCourse creates a large course for stress testing.
-func createLargeBenchmarkCourse() *models.Course {
-	lessons := make([]models.Lesson, 50)
-	for i := range 50 {
-		lessons[i] = models.Lesson{
-			ID:          string(rune(i)),
-			Title:       "Lesson " + string(rune(i)),
-			Type:        "lesson",
-			Description: "<p>This is lesson description with <em>formatting</em>.</p>",
-			Items: []models.Item{
-				{
-					Type: "text",
-					Items: []models.SubItem{
-						{
-							Heading:   "Section Heading",
-							Paragraph: "<p>Content with <strong>bold</strong> and <em>italic</em> text.</p>",
-						},
-					},
-				},
-				{
-					Type: "list",
-					Items: []models.SubItem{
-						{Paragraph: "Point 1"},
-						{Paragraph: "Point 2"},
-						{Paragraph: "Point 3"},
-					},
-				},
-				{
-					Type: "knowledgeCheck",
-					Items: []models.SubItem{
-						{
-							Title: "Quiz Question",
-							Answers: []models.Answer{
-								{Title: "Answer A", Correct: false},
-								{Title: "Answer B", Correct: true},
-								{Title: "Answer C", Correct: false},
-							},
-							Feedback: "Good job!",
-						},
-					},
-				},
-			},
-		}
-	}
-
-	return &models.Course{
-		ShareID: "large-benchmark-id",
-		Author:  "Benchmark Author",
-		Course: models.CourseInfo{
-			ID:          "large-bench-course",
-			Title:       "Large Benchmark Course",
-			Description: "Large performance testing course",
-			Lessons:     lessons,
-		},
-	}
-}

internal/exporters/docx.go

@@ -13,28 +13,34 @@ import (
 
 	"github.com/kjanat/articulate-parser/internal/interfaces"
 	"github.com/kjanat/articulate-parser/internal/models"
-	"github.com/kjanat/articulate-parser/internal/services"
+)
+
+// Font sizes for DOCX document headings (in half-points, so "32" = 16pt).
+const (
+	docxTitleSize  = "32" // Course title (16pt)
+	docxLessonSize = "28" // Lesson heading (14pt)
+	docxItemSize   = "24" // Item heading (12pt)
 )
 
 // DocxExporter implements the Exporter interface for DOCX format.
 // It converts Articulate Rise course data into a Microsoft Word document
 // using the go-docx package.
 type DocxExporter struct {
-	// htmlCleaner is used to convert HTML content to plain text
-	htmlCleaner *services.HTMLCleaner
+	baseExporter
 }
 
 // NewDocxExporter creates a new DocxExporter instance.
-// It takes an HTMLCleaner to handle HTML content conversion.
+// It takes an HTMLCleaner to handle HTML content conversion and a logger for logging.
 //
 // Parameters:
 //   - htmlCleaner: Service for cleaning HTML content in course data
+//   - logger: Logger instance for warnings and errors
 //
 // Returns:
 //   - An implementation of the Exporter interface for DOCX format
-func NewDocxExporter(htmlCleaner *services.HTMLCleaner) interfaces.Exporter {
+func NewDocxExporter(htmlCleaner interfaces.HTMLCleaner, logger interfaces.Logger) interfaces.Exporter {
 	return &DocxExporter{
-		htmlCleaner: htmlCleaner,
+		baseExporter: newBaseExporter(htmlCleaner, logger),
 	}
 }
 
@@ -53,7 +59,7 @@ func (e *DocxExporter) Export(course *models.Course, outputPath string) error {
 
 	// Add title
 	titlePara := doc.AddParagraph()
-	titlePara.AddText(course.Course.Title).Size("32").Bold()
+	titlePara.AddText(course.Course.Title).Size(docxTitleSize).Bold()
 
 	// Add description if available
 	if course.Course.Description != "" {
@@ -84,7 +90,7 @@ func (e *DocxExporter) Export(course *models.Course, outputPath string) error {
 	// affect the validity of the exported file.
 	defer func() {
 		if err := file.Close(); err != nil {
-			fmt.Fprintf(os.Stderr, "warning: failed to close output file: %v\n", err)
+			e.logger.Warn("failed to close output file", "error", err)
 		}
 	}()
 
@@ -106,7 +112,7 @@ func (e *DocxExporter) Export(course *models.Course, outputPath string) error {
 func (e *DocxExporter) exportLesson(doc *docx.Docx, lesson *models.Lesson) {
 	// Add lesson title
 	lessonPara := doc.AddParagraph()
-	lessonPara.AddText(fmt.Sprintf("Lesson: %s", lesson.Title)).Size("28").Bold()
+	lessonPara.AddText(fmt.Sprintf("Lesson: %s", lesson.Title)).Size(docxLessonSize).Bold()
 
 	// Add lesson description if available
 	if lesson.Description != "" {
@@ -132,7 +138,7 @@ func (e *DocxExporter) exportItem(doc *docx.Docx, item *models.Item) {
 	if item.Type != "" {
 		itemPara := doc.AddParagraph()
 		caser := cases.Title(language.English)
-		itemPara.AddText(caser.String(item.Type)).Size("24").Bold()
+		itemPara.AddText(caser.String(item.Type)).Size(docxItemSize).Bold()
 	}
 
 	// Add sub-items

internal/exporters/docx_test.go

@@ -12,7 +12,7 @@ import (
 // TestNewDocxExporter tests the NewDocxExporter constructor.
 func TestNewDocxExporter(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	if exporter == nil {
 		t.Fatal("NewDocxExporter() returned nil")
@@ -32,7 +32,7 @@ func TestNewDocxExporter(t *testing.T) {
 // TestDocxExporter_SupportedFormat tests the SupportedFormat method.
 func TestDocxExporter_SupportedFormat(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	expected := "docx"
 	result := exporter.SupportedFormat()
@@ -45,7 +45,7 @@ func TestDocxExporter_SupportedFormat(t *testing.T) {
 // TestDocxExporter_Export tests the Export method.
 func TestDocxExporter_Export(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	// Create test course
 	testCourse := createTestCourseForDocx()
@@ -79,7 +79,7 @@ func TestDocxExporter_Export(t *testing.T) {
 // TestDocxExporter_Export_AddDocxExtension tests that the .docx extension is added automatically.
 func TestDocxExporter_Export_AddDocxExtension(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	testCourse := createTestCourseForDocx()
 
@@ -102,7 +102,7 @@ func TestDocxExporter_Export_AddDocxExtension(t *testing.T) {
 // TestDocxExporter_Export_InvalidPath tests export with invalid output path.
 func TestDocxExporter_Export_InvalidPath(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	testCourse := createTestCourseForDocx()
 
@@ -118,7 +118,7 @@ func TestDocxExporter_Export_InvalidPath(t *testing.T) {
 // TestDocxExporter_ExportLesson tests the exportLesson method indirectly through Export.
 func TestDocxExporter_ExportLesson(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	// Create course with specific lesson content
 	course := &models.Course{
@@ -165,7 +165,7 @@ func TestDocxExporter_ExportLesson(t *testing.T) {
 // TestDocxExporter_ExportItem tests the exportItem method indirectly through Export.
 func TestDocxExporter_ExportItem(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	// Create course with different item types
 	course := &models.Course{
@@ -231,7 +231,7 @@ func TestDocxExporter_ExportItem(t *testing.T) {
 // TestDocxExporter_ExportSubItem tests the exportSubItem method indirectly through Export.
 func TestDocxExporter_ExportSubItem(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	// Create course with sub-item containing all possible fields
 	course := &models.Course{
@@ -284,7 +284,7 @@ func TestDocxExporter_ExportSubItem(t *testing.T) {
 // TestDocxExporter_ComplexCourse tests export of a complex course structure.
 func TestDocxExporter_ComplexCourse(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	// Create complex test course
 	course := &models.Course{
@@ -421,7 +421,7 @@ func TestDocxExporter_ComplexCourse(t *testing.T) {
 // TestDocxExporter_EmptyCourse tests export of an empty course.
 func TestDocxExporter_EmptyCourse(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	// Create minimal course
 	course := &models.Course{
@@ -450,7 +450,7 @@ func TestDocxExporter_EmptyCourse(t *testing.T) {
 // TestDocxExporter_HTMLCleaning tests that HTML content is properly cleaned.
 func TestDocxExporter_HTMLCleaning(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	// Create course with HTML content that needs cleaning
 	course := &models.Course{
@@ -498,7 +498,7 @@ func TestDocxExporter_HTMLCleaning(t *testing.T) {
 // TestDocxExporter_ExistingDocxExtension tests that existing .docx extension is preserved.
 func TestDocxExporter_ExistingDocxExtension(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	testCourse := createTestCourseForDocx()
 
@@ -526,7 +526,7 @@ func TestDocxExporter_ExistingDocxExtension(t *testing.T) {
 // TestDocxExporter_CaseInsensitiveExtension tests that extension checking is case-insensitive.
 func TestDocxExporter_CaseInsensitiveExtension(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	testCourse := createTestCourseForDocx()
 
@@ -599,7 +599,7 @@ func createTestCourseForDocx() *models.Course {
 // BenchmarkDocxExporter_Export benchmarks the Export method.
 func BenchmarkDocxExporter_Export(b *testing.B) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 	course := createTestCourseForDocx()
 
 	// Create temporary directory
@@ -618,7 +618,7 @@ func BenchmarkDocxExporter_Export(b *testing.B) {
 // BenchmarkDocxExporter_ComplexCourse benchmarks export of a complex course.
 func BenchmarkDocxExporter_ComplexCourse(b *testing.B) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewDocxExporter(htmlCleaner)
+	exporter := NewDocxExporter(htmlCleaner, nil)
 
 	// Create complex course for benchmarking
 	course := &models.Course{

internal/exporters/example_test.go

@@ -4,16 +4,33 @@ package exporters_test
 import (
 	"fmt"
 	"log"
+	"os"
+	"path/filepath"
 
 	"github.com/kjanat/articulate-parser/internal/exporters"
 	"github.com/kjanat/articulate-parser/internal/models"
 	"github.com/kjanat/articulate-parser/internal/services"
 )
 
+// exportToTemp runs export against a path in a fresh temp dir and removes the
+// dir afterwards. Example functions can't take *testing.T, so t.TempDir is
+// unavailable here.
+func exportToTemp(name string, export func(path string) error) {
+	dir, err := os.MkdirTemp("", "exporters-example-*")
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = export(filepath.Join(dir, name))
+	_ = os.RemoveAll(dir)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
 // ExampleNewFactory demonstrates creating an exporter factory.
 func ExampleNewFactory() {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := exporters.NewFactory(htmlCleaner)
+	factory := exporters.NewFactory(htmlCleaner, nil)
 
 	// Get supported formats
 	formats := factory.SupportedFormats()
@@ -24,7 +41,7 @@ func ExampleNewFactory() {
 // ExampleFactory_CreateExporter demonstrates creating exporters.
 func ExampleFactory_CreateExporter() {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := exporters.NewFactory(htmlCleaner)
+	factory := exporters.NewFactory(htmlCleaner, nil)
 
 	// Create a markdown exporter
 	exporter, err := factory.CreateExporter("markdown")
@@ -39,7 +56,7 @@ func ExampleFactory_CreateExporter() {
 // ExampleFactory_CreateExporter_caseInsensitive demonstrates case-insensitive format names.
 func ExampleFactory_CreateExporter_caseInsensitive() {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := exporters.NewFactory(htmlCleaner)
+	factory := exporters.NewFactory(htmlCleaner, nil)
 
 	// All these work (case-insensitive)
 	formats := []string{"MARKDOWN", "Markdown", "markdown", "MD"}
@@ -58,7 +75,7 @@ func ExampleFactory_CreateExporter_caseInsensitive() {
 // ExampleMarkdownExporter_Export demonstrates exporting to Markdown.
 func ExampleMarkdownExporter_Export() {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := exporters.NewMarkdownExporter(htmlCleaner)
+	exporter := exporters.NewMarkdownExporter(htmlCleaner, nil)
 
 	course := &models.Course{
 		ShareID: "example-id",
@@ -69,10 +86,9 @@ func ExampleMarkdownExporter_Export() {
 	}
 
 	// Export to markdown file
-	err := exporter.Export(course, "output.md")
-	if err != nil {
-		log.Fatal(err)
-	}
+	exportToTemp("output.md", func(path string) error {
+		return exporter.Export(course, path)
+	})
 
 	fmt.Println("Export complete")
 	// Output: Export complete
@@ -81,7 +97,7 @@ func ExampleMarkdownExporter_Export() {
 // ExampleDocxExporter_Export demonstrates exporting to DOCX.
 func ExampleDocxExporter_Export() {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := exporters.NewDocxExporter(htmlCleaner)
+	exporter := exporters.NewDocxExporter(htmlCleaner, nil)
 
 	course := &models.Course{
 		ShareID: "example-id",
@@ -91,11 +107,39 @@ func ExampleDocxExporter_Export() {
 	}
 
 	// Export to Word document
-	err := exporter.Export(course, "output.docx")
-	if err != nil {
-		log.Fatal(err)
-	}
+	exportToTemp("output.docx", func(path string) error {
+		return exporter.Export(course, path)
+	})
 
 	fmt.Println("DOCX export complete")
 	// Output: DOCX export complete
 }
+
+// ExampleHTMLExporter_Export demonstrates exporting to HTML.
+func ExampleHTMLExporter_Export() {
+	htmlCleaner := services.NewHTMLCleaner()
+	exporter := exporters.NewHTMLExporter(htmlCleaner, nil)
+
+	course := &models.Course{
+		ShareID: "example-id",
+		Course: models.CourseInfo{
+			Title:       "Example Course",
+			Description: "<p>A sample course</p>",
+			Lessons: []models.Lesson{
+				{
+					ID:    "lesson-1",
+					Title: "Introduction",
+					Type:  "lesson",
+				},
+			},
+		},
+	}
+
+	// Export to HTML file
+	exportToTemp("output.html", func(path string) error {
+		return exporter.Export(course, path)
+	})
+
+	fmt.Println("HTML export complete")
+	// Output: HTML export complete
+}

internal/exporters/factory.go

@@ -4,8 +4,8 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/kjanat/articulate-parser/internal/apperrors"
 	"github.com/kjanat/articulate-parser/internal/interfaces"
-	"github.com/kjanat/articulate-parser/internal/services"
 )
 
 // Format constants for supported export formats.
@@ -13,27 +13,36 @@ const (
 	FormatMarkdown = "markdown"
 	FormatDocx     = "docx"
 	FormatHTML     = "html"
+
+	// Format aliases accepted by CreateExporter.
+	formatAliasMarkdown = "md"
+	formatAliasDocx     = "word"
+	formatAliasHTML     = "htm"
 )
 
 // Factory implements the ExporterFactory interface.
 // It creates appropriate exporter instances based on the requested format.
 type Factory struct {
 	// htmlCleaner is used by exporters to convert HTML content to plain text
-	htmlCleaner *services.HTMLCleaner
+	htmlCleaner interfaces.HTMLCleaner
+	// logger is used by exporters for logging
+	logger interfaces.Logger
 }
 
 // NewFactory creates a new exporter factory.
-// It takes an HTMLCleaner instance that will be passed to the exporters
+// It takes an HTMLCleaner instance and a logger that will be passed to the exporters
 // created by this factory.
 //
 // Parameters:
 //   - htmlCleaner: Service for cleaning HTML content in course data
+//   - logger: Logger instance for exporter logging
 //
 // Returns:
 //   - An implementation of the ExporterFactory interface
-func NewFactory(htmlCleaner *services.HTMLCleaner) interfaces.ExporterFactory {
+func NewFactory(htmlCleaner interfaces.HTMLCleaner, logger interfaces.Logger) interfaces.ExporterFactory {
 	return &Factory{
 		htmlCleaner: htmlCleaner,
+		logger:      logger,
 	}
 }
 
@@ -41,19 +50,23 @@ func NewFactory(htmlCleaner *services.HTMLCleaner) interfaces.ExporterFactory {
 // Format strings are case-insensitive (e.g., "markdown", "DOCX").
 func (f *Factory) CreateExporter(format string) (interfaces.Exporter, error) {
 	switch strings.ToLower(format) {
-	case FormatMarkdown, "md":
-		return NewMarkdownExporter(f.htmlCleaner), nil
-	case FormatDocx, "word":
-		return NewDocxExporter(f.htmlCleaner), nil
-	case FormatHTML, "htm":
-		return NewHTMLExporter(f.htmlCleaner), nil
+	case FormatMarkdown, formatAliasMarkdown:
+		return NewMarkdownExporter(f.htmlCleaner, f.logger), nil
+	case FormatDocx, formatAliasDocx:
+		return NewDocxExporter(f.htmlCleaner, f.logger), nil
+	case FormatHTML, formatAliasHTML:
+		return NewHTMLExporter(f.htmlCleaner, f.logger), nil
 	default:
-		return nil, fmt.Errorf("unsupported export format: %s", format)
+		return nil, fmt.Errorf("%w: %s", apperrors.ErrUnsupportedFormat, format)
 	}
 }
 
 // SupportedFormats returns a list of all supported export formats,
 // including both primary format names and their aliases.
 func (f *Factory) SupportedFormats() []string {
-	return []string{FormatMarkdown, "md", FormatDocx, "word", FormatHTML, "htm"}
+	return []string{
+		FormatMarkdown, formatAliasMarkdown,
+		FormatDocx, formatAliasDocx,
+		FormatHTML, formatAliasHTML,
+	}
 }

internal/exporters/factory_test.go

@@ -12,7 +12,7 @@ import (
 // TestNewFactory tests the NewFactory constructor.
 func TestNewFactory(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	if factory == nil {
 		t.Fatal("NewFactory() returned nil")
@@ -32,7 +32,7 @@ func TestNewFactory(t *testing.T) {
 // TestFactory_CreateExporter tests the CreateExporter method for all supported formats.
 func TestFactory_CreateExporter(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	testCases := []struct {
 		name           string
@@ -135,7 +135,7 @@ func TestFactory_CreateExporter(t *testing.T) {
 // TestFactory_CreateExporter_CaseInsensitive tests that format strings are case-insensitive.
 func TestFactory_CreateExporter_CaseInsensitive(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	testCases := []struct {
 		format         string
@@ -182,7 +182,7 @@ func TestFactory_CreateExporter_CaseInsensitive(t *testing.T) {
 // TestFactory_CreateExporter_ErrorMessages tests error messages for unsupported formats.
 func TestFactory_CreateExporter_ErrorMessages(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	testCases := []string{
 		"pdf",
@@ -222,7 +222,7 @@ func TestFactory_CreateExporter_ErrorMessages(t *testing.T) {
 // TestFactory_SupportedFormats tests the SupportedFormats method.
 func TestFactory_SupportedFormats(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	formats := factory.SupportedFormats()
 
@@ -255,7 +255,7 @@ func TestFactory_SupportedFormats(t *testing.T) {
 // TestFactory_SupportedFormats_Immutable tests that the returned slice is safe to modify.
 func TestFactory_SupportedFormats_Immutable(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	// Get formats twice
 	formats1 := factory.SupportedFormats()
@@ -281,7 +281,7 @@ func TestFactory_SupportedFormats_Immutable(t *testing.T) {
 // TestFactory_ExporterTypes tests that created exporters are of correct types.
 func TestFactory_ExporterTypes(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	// Test markdown exporter
 	markdownExporter, err := factory.CreateExporter("markdown")
@@ -307,7 +307,7 @@ func TestFactory_ExporterTypes(t *testing.T) {
 // TestFactory_HTMLCleanerPropagation tests that HTMLCleaner is properly passed to exporters.
 func TestFactory_HTMLCleanerPropagation(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	// Test with markdown exporter
 	markdownExporter, err := factory.CreateExporter("markdown")
@@ -358,7 +358,7 @@ func TestFactory_HTMLCleanerPropagation(t *testing.T) {
 // TestFactory_MultipleExporterCreation tests creating multiple exporters of same type.
 func TestFactory_MultipleExporterCreation(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	// Create multiple markdown exporters
 	exporter1, err := factory.CreateExporter("markdown")
@@ -395,7 +395,7 @@ func TestFactory_WithNilHTMLCleaner(t *testing.T) {
 		}
 	}()
 
-	factory := NewFactory(nil)
+	factory := NewFactory(nil, nil)
 
 	if factory == nil {
 		t.Fatal("NewFactory(nil) returned nil")
@@ -412,7 +412,7 @@ func TestFactory_WithNilHTMLCleaner(t *testing.T) {
 // TestFactory_FormatNormalization tests that format strings are properly normalized.
 func TestFactory_FormatNormalization(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	// Test formats with extra whitespace
 	testCases := []struct {
@@ -445,7 +445,7 @@ func TestFactory_FormatNormalization(t *testing.T) {
 // BenchmarkFactory_CreateExporter benchmarks the CreateExporter method.
 func BenchmarkFactory_CreateExporter(b *testing.B) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	for b.Loop() {
 		_, _ = factory.CreateExporter("markdown")
@@ -455,7 +455,7 @@ func BenchmarkFactory_CreateExporter(b *testing.B) {
 // BenchmarkFactory_CreateExporter_Docx benchmarks creating DOCX exporters.
 func BenchmarkFactory_CreateExporter_Docx(b *testing.B) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	for b.Loop() {
 		_, _ = factory.CreateExporter("docx")
@@ -465,7 +465,7 @@ func BenchmarkFactory_CreateExporter_Docx(b *testing.B) {
 // BenchmarkFactory_SupportedFormats benchmarks the SupportedFormats method.
 func BenchmarkFactory_SupportedFormats(b *testing.B) {
 	htmlCleaner := services.NewHTMLCleaner()
-	factory := NewFactory(htmlCleaner)
+	factory := NewFactory(htmlCleaner, nil)
 
 	for b.Loop() {
 		_ = factory.SupportedFormats()

internal/exporters/html.go

@@ -9,7 +9,6 @@ import (
 
 	"github.com/kjanat/articulate-parser/internal/interfaces"
 	"github.com/kjanat/articulate-parser/internal/models"
-	"github.com/kjanat/articulate-parser/internal/services"
 )
 
 //go:embed html_styles.css
@@ -21,21 +20,22 @@ var htmlTemplate string
 // HTMLExporter implements the Exporter interface for HTML format.
 // It converts Articulate Rise course data into a structured HTML document using templates.
 type HTMLExporter struct {
-	// htmlCleaner is used to convert HTML content to plain text when needed
-	htmlCleaner *services.HTMLCleaner
-	// tmpl holds the parsed HTML template
+	baseExporter
+	// tmpl holds the parsed HTML template.
 	tmpl *template.Template
 }
 
 // NewHTMLExporter creates a new HTMLExporter instance.
-// It takes an HTMLCleaner to handle HTML content conversion when plain text is needed.
+// It takes an HTMLCleaner to handle HTML content conversion when plain text is needed
+// and a logger for logging.
 //
 // Parameters:
 //   - htmlCleaner: Service for cleaning HTML content in course data
+//   - logger: Logger instance for warnings and errors
 //
 // Returns:
 //   - An implementation of the Exporter interface for HTML format
-func NewHTMLExporter(htmlCleaner *services.HTMLCleaner) interfaces.Exporter {
+func NewHTMLExporter(htmlCleaner interfaces.HTMLCleaner, logger interfaces.Logger) interfaces.Exporter {
 	// Parse the template with custom functions
 	funcMap := template.FuncMap{
 		"safeHTML": func(s string) template.HTML {
@@ -49,8 +49,8 @@ func NewHTMLExporter(htmlCleaner *services.HTMLCleaner) interfaces.Exporter {
 	tmpl := template.Must(template.New("html").Funcs(funcMap).Parse(htmlTemplate))
 
 	return &HTMLExporter{
-		htmlCleaner: htmlCleaner,
-		tmpl:        tmpl,
+		baseExporter: newBaseExporter(htmlCleaner, logger),
+		tmpl:         tmpl,
 	}
 }
 
@@ -69,7 +69,16 @@ func (e *HTMLExporter) Export(course *models.Course, outputPath string) error {
 	if err != nil {
 		return fmt.Errorf("failed to create file: %w", err)
 	}
-	defer f.Close()
+	defer func() {
+		// Close errors are logged but not fatal since the content has already been written.
+		// The file must be closed to flush buffers, but a close error doesn't invalidate
+		// the data already written to disk.
+		if closeErr := f.Close(); closeErr != nil {
+			// Note: In production, this should log via a logger passed to the exporter.
+			// For now, we silently ignore close errors as they're non-fatal.
+			_ = closeErr
+		}
+	}()
 
 	return e.WriteHTML(f, course)
 }

internal/exporters/html_styles.css

@@ -1,173 +1,175 @@
 body {
-    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
-    line-height: 1.6;
-    color: #333;
-    max-width: 800px;
-    margin: 0 auto;
-    padding: 20px;
-    background-color: #f9f9f9;
+  font-family:
+    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
+    Cantarell, sans-serif;
+  line-height: 1.6;
+  color: #333;
+  max-width: 800px;
+  margin: 0 auto;
+  padding: 20px;
+  background-color: #f9f9f9;
 }
 header {
-    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
-    color: white;
-    padding: 2rem;
-    border-radius: 10px;
-    margin-bottom: 2rem;
-    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  color: white;
+  padding: 2rem;
+  border-radius: 10px;
+  margin-bottom: 2rem;
+  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
 }
 header h1 {
-    margin: 0;
-    font-size: 2.5rem;
-    font-weight: 300;
+  margin: 0;
+  font-size: 2.5rem;
+  font-weight: 300;
 }
 .course-description {
-    margin-top: 1rem;
-    font-size: 1.1rem;
-    opacity: 0.9;
+  margin-top: 1rem;
+  font-size: 1.1rem;
+  opacity: 0.9;
 }
 .course-info {
-    background: white;
-    padding: 1.5rem;
-    border-radius: 8px;
-    margin-bottom: 2rem;
-    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
+  background: white;
+  padding: 1.5rem;
+  border-radius: 8px;
+  margin-bottom: 2rem;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
 }
 .course-info h2 {
-    margin-top: 0;
-    color: #4a5568;
-    border-bottom: 2px solid #e2e8f0;
-    padding-bottom: 0.5rem;
+  margin-top: 0;
+  color: #4a5568;
+  border-bottom: 2px solid #e2e8f0;
+  padding-bottom: 0.5rem;
 }
 .course-info ul {
-    list-style: none;
-    padding: 0;
+  list-style: none;
+  padding: 0;
 }
 .course-info li {
-    margin: 0.5rem 0;
-    padding: 0.5rem;
-    background: #f7fafc;
-    border-radius: 4px;
+  margin: 0.5rem 0;
+  padding: 0.5rem;
+  background: #f7fafc;
+  border-radius: 4px;
 }
 .course-section {
-    background: #4299e1;
-    color: white;
-    padding: 1.5rem;
-    border-radius: 8px;
-    margin: 2rem 0;
-    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
+  background: #4299e1;
+  color: white;
+  padding: 1.5rem;
+  border-radius: 8px;
+  margin: 2rem 0;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
 }
 .course-section h2 {
-    margin: 0;
-    font-weight: 400;
+  margin: 0;
+  font-weight: 400;
 }
 .lesson {
-    background: white;
-    padding: 2rem;
-    border-radius: 8px;
-    margin: 2rem 0;
-    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
-    border-left: 4px solid #4299e1;
+  background: white;
+  padding: 2rem;
+  border-radius: 8px;
+  margin: 2rem 0;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
+  border-left: 4px solid #4299e1;
 }
 .lesson h3 {
-    margin-top: 0;
-    color: #2d3748;
-    font-size: 1.5rem;
+  margin-top: 0;
+  color: #2d3748;
+  font-size: 1.5rem;
 }
 .lesson-description {
-    margin: 1rem 0;
-    padding: 1rem;
-    background: #f7fafc;
-    border-radius: 4px;
-    border-left: 3px solid #4299e1;
+  margin: 1rem 0;
+  padding: 1rem;
+  background: #f7fafc;
+  border-radius: 4px;
+  border-left: 3px solid #4299e1;
 }
 .item {
-    margin: 1.5rem 0;
-    padding: 1rem;
-    border-radius: 6px;
-    background: #fafafa;
-    border: 1px solid #e2e8f0;
+  margin: 1.5rem 0;
+  padding: 1rem;
+  border-radius: 6px;
+  background: #fafafa;
+  border: 1px solid #e2e8f0;
 }
 .item h4 {
-    margin-top: 0;
-    color: #4a5568;
-    font-size: 1.2rem;
-    text-transform: capitalize;
+  margin-top: 0;
+  color: #4a5568;
+  font-size: 1.2rem;
+  text-transform: capitalize;
 }
 .text-item {
-    background: #f0fff4;
-    border-left: 3px solid #48bb78;
+  background: #f0fff4;
+  border-left: 3px solid #48bb78;
 }
 .list-item {
-    background: #fffaf0;
-    border-left: 3px solid #ed8936;
+  background: #fffaf0;
+  border-left: 3px solid #ed8936;
 }
 .knowledge-check {
-    background: #e6fffa;
-    border-left: 3px solid #38b2ac;
+  background: #e6fffa;
+  border-left: 3px solid #38b2ac;
 }
 .multimedia-item {
-    background: #faf5ff;
-    border-left: 3px solid #9f7aea;
+  background: #faf5ff;
+  border-left: 3px solid #9f7aea;
 }
 .interactive-item {
-    background: #fff5f5;
-    border-left: 3px solid #f56565;
+  background: #fff5f5;
+  border-left: 3px solid #f56565;
 }
 .unknown-item {
-    background: #f7fafc;
-    border-left: 3px solid #a0aec0;
+  background: #f7fafc;
+  border-left: 3px solid #a0aec0;
 }
 .answers {
-    margin: 1rem 0;
+  margin: 1rem 0;
 }
 .answers h5 {
-    margin: 0.5rem 0;
-    color: #4a5568;
+  margin: 0.5rem 0;
+  color: #4a5568;
 }
 .answers ol {
-    margin: 0.5rem 0;
-    padding-left: 1.5rem;
+  margin: 0.5rem 0;
+  padding-left: 1.5rem;
 }
 .answers li {
-    margin: 0.3rem 0;
-    padding: 0.3rem;
+  margin: 0.3rem 0;
+  padding: 0.3rem;
 }
 .correct-answer {
-    background: #c6f6d5;
-    border-radius: 3px;
-    font-weight: bold;
+  background: #c6f6d5;
+  border-radius: 3px;
+  font-weight: bold;
 }
 .correct-answer::after {
-    content: " ✓";
-    color: #38a169;
+  content: " ✓";
+  color: #38a169;
 }
 .feedback {
-    margin: 1rem 0;
-    padding: 1rem;
-    background: #edf2f7;
-    border-radius: 4px;
-    border-left: 3px solid #4299e1;
-    font-style: italic;
+  margin: 1rem 0;
+  padding: 1rem;
+  background: #edf2f7;
+  border-radius: 4px;
+  border-left: 3px solid #4299e1;
+  font-style: italic;
 }
 .media-info {
-    background: #edf2f7;
-    padding: 1rem;
-    border-radius: 4px;
-    margin: 0.5rem 0;
+  background: #edf2f7;
+  padding: 1rem;
+  border-radius: 4px;
+  margin: 0.5rem 0;
 }
 .media-info strong {
-    color: #4a5568;
+  color: #4a5568;
 }
 hr {
-    border: none;
-    height: 2px;
-    background: linear-gradient(to right, #667eea, #764ba2);
-    margin: 2rem 0;
-    border-radius: 1px;
+  border: none;
+  height: 2px;
+  background: linear-gradient(to right, #667eea, #764ba2);
+  margin: 2rem 0;
+  border-radius: 1px;
 }
 ul {
-    padding-left: 1.5rem;
+  padding-left: 1.5rem;
 }
 li {
-    margin: 0.5rem 0;
+  margin: 0.5rem 0;
 }

internal/exporters/html_template_data.go

@@ -6,19 +6,8 @@ import (
 	"golang.org/x/text/cases"
 	"golang.org/x/text/language"
 
+	"github.com/kjanat/articulate-parser/internal/interfaces"
 	"github.com/kjanat/articulate-parser/internal/models"
-	"github.com/kjanat/articulate-parser/internal/services"
-)
-
-// Item type constants.
-const (
-	itemTypeText           = "text"
-	itemTypeList           = "list"
-	itemTypeKnowledgeCheck = "knowledgecheck"
-	itemTypeMultimedia     = "multimedia"
-	itemTypeImage          = "image"
-	itemTypeInteractive    = "interactive"
-	itemTypeDivider        = "divider"
 )
 
 // templateData represents the data structure passed to the HTML template.
@@ -58,7 +47,7 @@ type templateSubItem struct {
 }
 
 // prepareTemplateData converts a Course model into template-friendly data.
-func prepareTemplateData(course *models.Course, htmlCleaner *services.HTMLCleaner) *templateData {
+func prepareTemplateData(course *models.Course, htmlCleaner interfaces.HTMLCleaner) *templateData {
 	data := &templateData{
 		Course:   course.Course,
 		ShareID:  course.ShareID,
@@ -74,7 +63,7 @@ func prepareTemplateData(course *models.Course, htmlCleaner *services.HTMLCleane
 			Description: lesson.Description,
 		}
 
-		if lesson.Type != "section" {
+		if lesson.Type != models.LessonTypeSection {
 			lessonCounter++
 			section.Number = lessonCounter
 			section.Items = prepareItems(lesson.Items, htmlCleaner)
@@ -87,7 +76,7 @@ func prepareTemplateData(course *models.Course, htmlCleaner *services.HTMLCleane
 }
 
 // prepareItems converts model Items to template Items.
-func prepareItems(items []models.Item, htmlCleaner *services.HTMLCleaner) []templateItem {
+func prepareItems(items []models.Item, htmlCleaner interfaces.HTMLCleaner) []templateItem {
 	result := make([]templateItem, 0, len(items))
 
 	for _, item := range items {
@@ -97,9 +86,9 @@ func prepareItems(items []models.Item, htmlCleaner *services.HTMLCleaner) []temp
 		}
 
 		// Set type title for unknown items
-		if tItem.Type != itemTypeText && tItem.Type != itemTypeList && tItem.Type != itemTypeKnowledgeCheck &&
-			tItem.Type != itemTypeMultimedia && tItem.Type != itemTypeImage && tItem.Type != itemTypeInteractive &&
-			tItem.Type != itemTypeDivider {
+		if tItem.Type != models.ItemTypeText && tItem.Type != models.ItemTypeList && tItem.Type != models.ItemTypeKnowledgeCheck &&
+			tItem.Type != models.ItemTypeMultimedia && tItem.Type != models.ItemTypeImage && tItem.Type != models.ItemTypeInteractive &&
+			tItem.Type != models.ItemTypeDivider {
 			caser := cases.Title(language.English)
 			tItem.TypeTitle = caser.String(item.Type)
 		}
@@ -117,7 +106,7 @@ func prepareItems(items []models.Item, htmlCleaner *services.HTMLCleaner) []temp
 			}
 
 			// Clean HTML for list items
-			if tItem.Type == itemTypeList && subItem.Paragraph != "" {
+			if tItem.Type == models.ItemTypeList && subItem.Paragraph != "" {
 				tSubItem.CleanText = htmlCleaner.CleanHTML(subItem.Paragraph)
 			}
 

internal/exporters/html_test.go

@@ -13,7 +13,7 @@ import (
 // TestNewHTMLExporter tests the NewHTMLExporter constructor.
 func TestNewHTMLExporter(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewHTMLExporter(htmlCleaner)
+	exporter := NewHTMLExporter(htmlCleaner, nil)
 
 	if exporter == nil {
 		t.Fatal("NewHTMLExporter() returned nil")
@@ -37,7 +37,7 @@ func TestNewHTMLExporter(t *testing.T) {
 // TestHTMLExporter_SupportedFormat tests the SupportedFormat method.
 func TestHTMLExporter_SupportedFormat(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewHTMLExporter(htmlCleaner)
+	exporter := NewHTMLExporter(htmlCleaner, nil)
 
 	expected := "html"
 	result := exporter.SupportedFormat()
@@ -50,7 +50,7 @@ func TestHTMLExporter_SupportedFormat(t *testing.T) {
 // TestHTMLExporter_Export tests the Export method.
 func TestHTMLExporter_Export(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewHTMLExporter(htmlCleaner)
+	exporter := NewHTMLExporter(htmlCleaner, nil)
 
 	// Create test course
 	testCourse := createTestCourseForHTML()
@@ -129,7 +129,7 @@ func TestHTMLExporter_Export(t *testing.T) {
 // TestHTMLExporter_Export_InvalidPath tests export with invalid output path.
 func TestHTMLExporter_Export_InvalidPath(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewHTMLExporter(htmlCleaner)
+	exporter := NewHTMLExporter(htmlCleaner, nil)
 
 	testCourse := createTestCourseForHTML()
 
@@ -145,7 +145,7 @@ func TestHTMLExporter_Export_InvalidPath(t *testing.T) {
 // TestHTMLExporter_ComplexCourse tests export of a course with complex content.
 func TestHTMLExporter_ComplexCourse(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewHTMLExporter(htmlCleaner)
+	exporter := NewHTMLExporter(htmlCleaner, nil)
 
 	// Create complex test course
 	course := &models.Course{
@@ -276,7 +276,7 @@ func TestHTMLExporter_ComplexCourse(t *testing.T) {
 // TestHTMLExporter_EmptyCourse tests export of an empty course.
 func TestHTMLExporter_EmptyCourse(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewHTMLExporter(htmlCleaner)
+	exporter := NewHTMLExporter(htmlCleaner, nil)
 
 	// Create minimal course
 	course := &models.Course{
@@ -324,7 +324,7 @@ func TestHTMLExporter_EmptyCourse(t *testing.T) {
 // TestHTMLExporter_HTMLCleaning tests that HTML content is properly handled.
 func TestHTMLExporter_HTMLCleaning(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewHTMLExporter(htmlCleaner)
+	exporter := NewHTMLExporter(htmlCleaner, nil)
 
 	// Create course with HTML content that needs cleaning in some places
 	course := &models.Course{
@@ -392,6 +392,227 @@ func TestHTMLExporter_HTMLCleaning(t *testing.T) {
 	}
 }
 
+// TestHTMLExporter_Export_ErrorPaths tests various error conditions for the HTML exporter.
+func TestHTMLExporter_Export_ErrorPaths(t *testing.T) {
+	htmlCleaner := services.NewHTMLCleaner()
+	exporter := NewHTMLExporter(htmlCleaner, nil)
+
+	tests := []struct {
+		name        string
+		course      *models.Course
+		outputPath  string
+		wantErr     bool
+		errContains string
+	}{
+		{
+			name:        "non-existent directory",
+			course:      createTestCourseForHTML(),
+			outputPath:  "/nonexistent/deeply/nested/path/output.html",
+			wantErr:     true,
+			errContains: "failed to create file",
+		},
+		{
+			name:        "empty output path",
+			course:      createTestCourseForHTML(),
+			outputPath:  "",
+			wantErr:     true,
+			errContains: "failed to create file",
+		},
+		{
+			name:        "output path is directory",
+			course:      createTestCourseForHTML(),
+			outputPath:  t.TempDir(), // directory, not a file
+			wantErr:     true,
+			errContains: "failed to create file",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := exporter.Export(tt.course, tt.outputPath)
+
+			if tt.wantErr {
+				if err == nil {
+					t.Errorf("Export() expected error containing %q, got nil", tt.errContains)
+					return
+				}
+				if tt.errContains != "" && !strings.Contains(err.Error(), tt.errContains) {
+					t.Errorf("Export() error = %v, want error containing %q", err, tt.errContains)
+				}
+			} else if err != nil {
+				t.Errorf("Export() unexpected error = %v", err)
+			}
+		})
+	}
+}
+
+// TestHTMLExporter_WriteHTML_ErrorPaths tests WriteHTML error conditions.
+func TestHTMLExporter_WriteHTML_ErrorPaths(t *testing.T) {
+	htmlCleaner := services.NewHTMLCleaner()
+	exporter := NewHTMLExporter(htmlCleaner, nil)
+	htmlExporter := exporter.(*HTMLExporter)
+
+	tests := []struct {
+		name        string
+		course      *models.Course
+		writer      *failingWriter
+		wantErr     bool
+		errContains string
+	}{
+		{
+			name:        "writer fails immediately",
+			course:      createTestCourseForHTML(),
+			writer:      &failingWriter{failAfter: 0},
+			wantErr:     true,
+			errContains: "failed to execute template",
+		},
+		{
+			name:        "writer fails mid-write",
+			course:      createTestCourseForHTML(),
+			writer:      &failingWriter{failAfter: 100},
+			wantErr:     true,
+			errContains: "failed to execute template",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := htmlExporter.WriteHTML(tt.writer, tt.course)
+
+			if tt.wantErr {
+				if err == nil {
+					t.Errorf("WriteHTML() expected error containing %q, got nil", tt.errContains)
+					return
+				}
+				if tt.errContains != "" && !strings.Contains(err.Error(), tt.errContains) {
+					t.Errorf("WriteHTML() error = %v, want error containing %q", err, tt.errContains)
+				}
+			} else if err != nil {
+				t.Errorf("WriteHTML() unexpected error = %v", err)
+			}
+		})
+	}
+}
+
+// TestHTMLExporter_Export_NilCourse verifies that exporting a nil course panics.
+// This documents the current behavior - nil course is not a supported input.
+func TestHTMLExporter_Export_NilCourse(t *testing.T) {
+	htmlCleaner := services.NewHTMLCleaner()
+	exporter := NewHTMLExporter(htmlCleaner, nil)
+
+	tempDir := t.TempDir()
+	outputPath := filepath.Join(tempDir, "nil-course.html")
+
+	defer func() {
+		if r := recover(); r == nil {
+			t.Error("Export(nil) expected panic, got none")
+		}
+	}()
+
+	// Export nil course - should panic
+	_ = exporter.Export(nil, outputPath)
+}
+
+// TestHTMLExporter_WriteHTML_NilCourse verifies that WriteHTML with nil course panics.
+func TestHTMLExporter_WriteHTML_NilCourse(t *testing.T) {
+	htmlCleaner := services.NewHTMLCleaner()
+	exporter := NewHTMLExporter(htmlCleaner, nil)
+	htmlExporter := exporter.(*HTMLExporter)
+
+	defer func() {
+		if r := recover(); r == nil {
+			t.Error("WriteHTML(nil) expected panic, got none")
+		}
+	}()
+
+	var buf strings.Builder
+	_ = htmlExporter.WriteHTML(&buf, nil)
+}
+
+// TestHTMLExporter_WriteHTML_SuccessWithBuffer tests WriteHTML with a buffer.
+func TestHTMLExporter_WriteHTML_SuccessWithBuffer(t *testing.T) {
+	htmlCleaner := services.NewHTMLCleaner()
+	exporter := NewHTMLExporter(htmlCleaner, nil)
+	htmlExporter := exporter.(*HTMLExporter)
+
+	tests := []struct {
+		name     string
+		course   *models.Course
+		contains []string
+	}{
+		{
+			name:   "basic course",
+			course: createTestCourseForHTML(),
+			contains: []string{
+				"<!DOCTYPE html>",
+				"<html lang=\"en\">",
+				"Test Course",
+			},
+		},
+		{
+			name: "course with special characters",
+			course: &models.Course{
+				ShareID: "special-chars-id",
+				Course: models.CourseInfo{
+					ID:          "special-course",
+					Title:       "Course with <special> & \"characters\"",
+					Description: "<p>Description with &amp; entities</p>",
+					Lessons:     []models.Lesson{},
+				},
+			},
+			contains: []string{
+				"<!DOCTYPE html>",
+				"Course with",
+				"special",
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var buf strings.Builder
+			err := htmlExporter.WriteHTML(&buf, tt.course)
+			if err != nil {
+				t.Fatalf("WriteHTML() unexpected error: %v", err)
+			}
+
+			output := buf.String()
+			for _, want := range tt.contains {
+				if !strings.Contains(output, want) {
+					t.Errorf("WriteHTML() output missing %q", want)
+				}
+			}
+		})
+	}
+}
+
+// failingWriter is a test helper that fails after writing a certain number of bytes.
+type failingWriter struct {
+	written   int
+	failAfter int
+}
+
+func (w *failingWriter) Write(p []byte) (n int, err error) {
+	if w.written >= w.failAfter {
+		return 0, errWriteFailed
+	}
+	w.written += len(p)
+	if w.written > w.failAfter {
+		return 0, errWriteFailed
+	}
+	return len(p), nil
+}
+
+var errWriteFailed = &writeError{msg: "simulated write failure"}
+
+type writeError struct {
+	msg string
+}
+
+func (e *writeError) Error() string {
+	return e.msg
+}
+
 // createTestCourseForHTML creates a test course for HTML export tests.
 func createTestCourseForHTML() *models.Course {
 	return &models.Course{
@@ -439,7 +660,7 @@ func createTestCourseForHTML() *models.Course {
 // BenchmarkHTMLExporter_Export benchmarks the Export method.
 func BenchmarkHTMLExporter_Export(b *testing.B) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewHTMLExporter(htmlCleaner)
+	exporter := NewHTMLExporter(htmlCleaner, nil)
 	course := createTestCourseForHTML()
 
 	tempDir := b.TempDir()
@@ -455,7 +676,7 @@ func BenchmarkHTMLExporter_Export(b *testing.B) {
 // BenchmarkHTMLExporter_ComplexCourse benchmarks export of a complex course.
 func BenchmarkHTMLExporter_ComplexCourse(b *testing.B) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewHTMLExporter(htmlCleaner)
+	exporter := NewHTMLExporter(htmlCleaner, nil)
 
 	// Create complex course for benchmarking
 	course := &models.Course{

internal/exporters/markdown.go

@@ -11,27 +11,26 @@ import (
 
 	"github.com/kjanat/articulate-parser/internal/interfaces"
 	"github.com/kjanat/articulate-parser/internal/models"
-	"github.com/kjanat/articulate-parser/internal/services"
 )
 
 // MarkdownExporter implements the Exporter interface for Markdown format.
 // It converts Articulate Rise course data into a structured Markdown document.
 type MarkdownExporter struct {
-	// htmlCleaner is used to convert HTML content to plain text
-	htmlCleaner *services.HTMLCleaner
+	baseExporter
 }
 
 // NewMarkdownExporter creates a new MarkdownExporter instance.
-// It takes an HTMLCleaner to handle HTML content conversion.
+// It takes an HTMLCleaner to handle HTML content conversion and a logger for logging.
 //
 // Parameters:
 //   - htmlCleaner: Service for cleaning HTML content in course data
+//   - logger: Logger instance for warnings and errors
 //
 // Returns:
 //   - An implementation of the Exporter interface for Markdown format
-func NewMarkdownExporter(htmlCleaner *services.HTMLCleaner) interfaces.Exporter {
+func NewMarkdownExporter(htmlCleaner interfaces.HTMLCleaner, logger interfaces.Logger) interfaces.Exporter {
 	return &MarkdownExporter{
-		htmlCleaner: htmlCleaner,
+		baseExporter: newBaseExporter(htmlCleaner, logger),
 	}
 }
 
@@ -40,35 +39,39 @@ func (e *MarkdownExporter) Export(course *models.Course, outputPath string) erro
 	var buf bytes.Buffer
 
 	// Write course header
-	buf.WriteString(fmt.Sprintf("# %s\n\n", course.Course.Title))
+	fmt.Fprintf(&buf, "# %s\n\n", strings.TrimSpace(course.Course.Title))
 
 	if course.Course.Description != "" {
-		buf.WriteString(fmt.Sprintf("%s\n\n", e.htmlCleaner.CleanHTML(course.Course.Description)))
+		if desc := e.htmlCleaner.CleanAndTrim(course.Course.Description); desc != "" {
+			fmt.Fprintf(&buf, "%s\n\n", desc)
+		}
 	}
 
 	// Add metadata
 	buf.WriteString("## Course Information\n\n")
-	buf.WriteString(fmt.Sprintf("- **Course ID**: %s\n", course.Course.ID))
-	buf.WriteString(fmt.Sprintf("- **Share ID**: %s\n", course.ShareID))
-	buf.WriteString(fmt.Sprintf("- **Navigation Mode**: %s\n", course.Course.NavigationMode))
+	fmt.Fprintf(&buf, "- **Course ID**: %s\n", strings.TrimSpace(course.Course.ID))
+	fmt.Fprintf(&buf, "- **Share ID**: %s\n", strings.TrimSpace(course.ShareID))
+	fmt.Fprintf(&buf, "- **Navigation Mode**: %s\n", strings.TrimSpace(course.Course.NavigationMode))
 	if course.Course.ExportSettings != nil {
-		buf.WriteString(fmt.Sprintf("- **Export Format**: %s\n", course.Course.ExportSettings.Format))
+		fmt.Fprintf(&buf, "- **Export Format**: %s\n", strings.TrimSpace(course.Course.ExportSettings.Format))
 	}
 	buf.WriteString("\n---\n\n")
 
 	// Process lessons
 	lessonCounter := 0
 	for _, lesson := range course.Course.Lessons {
-		if lesson.Type == "section" {
-			buf.WriteString(fmt.Sprintf("# %s\n\n", lesson.Title))
+		if lesson.Type == models.LessonTypeSection {
+			fmt.Fprintf(&buf, "# %s\n\n", strings.TrimSpace(lesson.Title))
 			continue
 		}
 
 		lessonCounter++
-		buf.WriteString(fmt.Sprintf("## Lesson %d: %s\n\n", lessonCounter, lesson.Title))
+		fmt.Fprintf(&buf, "## Lesson %d: %s\n\n", lessonCounter, strings.TrimSpace(lesson.Title))
 
 		if lesson.Description != "" {
-			buf.WriteString(fmt.Sprintf("%s\n\n", e.htmlCleaner.CleanHTML(lesson.Description)))
+			if desc := e.htmlCleaner.CleanAndTrim(lesson.Description); desc != "" {
+				fmt.Fprintf(&buf, "%s\n\n", desc)
+			}
 		}
 
 		// Process lesson items
@@ -76,16 +79,49 @@ func (e *MarkdownExporter) Export(course *models.Course, outputPath string) erro
 			e.processItemToMarkdown(&buf, item, 3)
 		}
 
-		buf.WriteString("\n---\n\n")
+		buf.WriteString("---\n\n")
 	}
 
+	// Clean up multiple consecutive blank lines before writing
+	output := cleanMarkdownWhitespace(buf.Bytes())
+
 	// #nosec G306 - 0644 is appropriate for export files that should be readable by others
-	if err := os.WriteFile(outputPath, buf.Bytes(), 0o644); err != nil {
+	if err := os.WriteFile(outputPath, output, 0o644); err != nil {
 		return fmt.Errorf("failed to write markdown file: %w", err)
 	}
 	return nil
 }
 
+// cleanMarkdownWhitespace normalizes whitespace in markdown output.
+// It removes trailing whitespace from lines and collapses multiple blank lines into one.
+func cleanMarkdownWhitespace(data []byte) []byte {
+	lines := strings.Split(string(data), "\n")
+	result := make([]string, 0, len(lines))
+	prevBlank := false
+
+	for _, line := range lines {
+		// Trim trailing whitespace from each line
+		trimmed := strings.TrimRight(line, " \t")
+
+		// Collapse multiple consecutive blank lines
+		isBlank := trimmed == ""
+		if isBlank && prevBlank {
+			continue
+		}
+
+		result = append(result, trimmed)
+		prevBlank = isBlank
+	}
+
+	// Remove trailing blank lines
+	for len(result) > 0 && result[len(result)-1] == "" {
+		result = result[:len(result)-1]
+	}
+
+	// Ensure file ends with newline
+	return []byte(strings.Join(result, "\n") + "\n")
+}
+
 // SupportedFormat returns "markdown".
 func (e *MarkdownExporter) SupportedFormat() string {
 	return FormatMarkdown
@@ -96,20 +132,23 @@ func (e *MarkdownExporter) SupportedFormat() string {
 func (e *MarkdownExporter) processItemToMarkdown(buf *bytes.Buffer, item models.Item, level int) {
 	headingPrefix := strings.Repeat("#", level)
 
-	switch item.Type {
-	case "text":
+	// Normalize item type to lowercase for consistent matching
+	itemType := strings.ToLower(item.Type)
+
+	switch itemType {
+	case models.ItemTypeText:
 		e.processTextItem(buf, item, headingPrefix)
-	case "list":
+	case models.ItemTypeList:
 		e.processListItem(buf, item)
-	case "multimedia":
+	case models.ItemTypeMultimedia:
 		e.processMultimediaItem(buf, item, headingPrefix)
-	case "image":
+	case models.ItemTypeImage:
 		e.processImageItem(buf, item, headingPrefix)
-	case "knowledgeCheck":
+	case models.ItemTypeKnowledgeCheck:
 		e.processKnowledgeCheckItem(buf, item, headingPrefix)
-	case "interactive":
+	case models.ItemTypeInteractive:
 		e.processInteractiveItem(buf, item, headingPrefix)
-	case "divider":
+	case models.ItemTypeDivider:
 		e.processDividerItem(buf)
 	default:
 		e.processUnknownItem(buf, item, headingPrefix)
@@ -120,14 +159,12 @@ func (e *MarkdownExporter) processItemToMarkdown(buf *bytes.Buffer, item models.
 func (e *MarkdownExporter) processTextItem(buf *bytes.Buffer, item models.Item, headingPrefix string) {
 	for _, subItem := range item.Items {
 		if subItem.Heading != "" {
-			heading := e.htmlCleaner.CleanHTML(subItem.Heading)
-			if heading != "" {
+			if heading := e.htmlCleaner.CleanAndTrim(subItem.Heading); heading != "" {
 				fmt.Fprintf(buf, "%s %s\n\n", headingPrefix, heading)
 			}
 		}
 		if subItem.Paragraph != "" {
-			paragraph := e.htmlCleaner.CleanHTML(subItem.Paragraph)
-			if paragraph != "" {
+			if paragraph := e.htmlCleaner.CleanAndTrim(subItem.Paragraph); paragraph != "" {
 				fmt.Fprintf(buf, "%s\n\n", paragraph)
 			}
 		}
@@ -138,8 +175,7 @@ func (e *MarkdownExporter) processTextItem(buf *bytes.Buffer, item models.Item,
 func (e *MarkdownExporter) processListItem(buf *bytes.Buffer, item models.Item) {
 	for _, subItem := range item.Items {
 		if subItem.Paragraph != "" {
-			paragraph := e.htmlCleaner.CleanHTML(subItem.Paragraph)
-			if paragraph != "" {
+			if paragraph := e.htmlCleaner.CleanAndTrim(subItem.Paragraph); paragraph != "" {
 				fmt.Fprintf(buf, "- %s\n", paragraph)
 			}
 		}
@@ -163,8 +199,9 @@ func (e *MarkdownExporter) processMediaSubItem(buf *bytes.Buffer, subItem models
 		e.processImageMedia(buf, subItem.Media)
 	}
 	if subItem.Caption != "" {
-		caption := e.htmlCleaner.CleanHTML(subItem.Caption)
-		fmt.Fprintf(buf, "*%s*\n", caption)
+		if caption := e.htmlCleaner.CleanAndTrim(subItem.Caption); caption != "" {
+			fmt.Fprintf(buf, "*%s*\n", caption)
+		}
 	}
 }
 
@@ -193,8 +230,9 @@ func (e *MarkdownExporter) processImageItem(buf *bytes.Buffer, item models.Item,
 			fmt.Fprintf(buf, "**Image**: %s\n", subItem.Media.Image.OriginalURL)
 		}
 		if subItem.Caption != "" {
-			caption := e.htmlCleaner.CleanHTML(subItem.Caption)
-			fmt.Fprintf(buf, "*%s*\n", caption)
+			if caption := e.htmlCleaner.CleanAndTrim(subItem.Caption); caption != "" {
+				fmt.Fprintf(buf, "*%s*\n", caption)
+			}
 		}
 	}
 	buf.WriteString("\n")
@@ -212,27 +250,33 @@ func (e *MarkdownExporter) processKnowledgeCheckItem(buf *bytes.Buffer, item mod
 // processQuestionSubItem processes individual question items.
 func (e *MarkdownExporter) processQuestionSubItem(buf *bytes.Buffer, subItem models.SubItem) {
 	if subItem.Title != "" {
-		title := e.htmlCleaner.CleanHTML(subItem.Title)
-		fmt.Fprintf(buf, "**Question**: %s\n\n", title)
+		if title := e.htmlCleaner.CleanAndTrim(subItem.Title); title != "" {
+			fmt.Fprintf(buf, "**Question**: %s\n\n", title)
+		}
 	}
 
 	e.processAnswers(buf, subItem.Answers)
 
 	if subItem.Feedback != "" {
-		feedback := e.htmlCleaner.CleanHTML(subItem.Feedback)
-		fmt.Fprintf(buf, "\n**Feedback**: %s\n", feedback)
+		if feedback := e.htmlCleaner.CleanAndTrim(subItem.Feedback); feedback != "" {
+			fmt.Fprintf(buf, "\n**Feedback**: %s\n", feedback)
+		}
 	}
 }
 
 // processAnswers processes answer choices for quiz questions.
 func (e *MarkdownExporter) processAnswers(buf *bytes.Buffer, answers []models.Answer) {
+	if len(answers) == 0 {
+		return
+	}
 	buf.WriteString("**Answers**:\n")
 	for i, answer := range answers {
 		correctMark := ""
 		if answer.Correct {
-			correctMark = " ✓"
+			correctMark = " [correct]"
 		}
-		fmt.Fprintf(buf, "%d. %s%s\n", i+1, answer.Title, correctMark)
+		title := strings.TrimSpace(answer.Title)
+		fmt.Fprintf(buf, "%d. %s%s\n", i+1, title, correctMark)
 	}
 }
 
@@ -241,8 +285,9 @@ func (e *MarkdownExporter) processInteractiveItem(buf *bytes.Buffer, item models
 	fmt.Fprintf(buf, "%s Interactive Content\n\n", headingPrefix)
 	for _, subItem := range item.Items {
 		if subItem.Title != "" {
-			title := e.htmlCleaner.CleanHTML(subItem.Title)
-			fmt.Fprintf(buf, "**%s**\n\n", title)
+			if title := e.htmlCleaner.CleanAndTrim(subItem.Title); title != "" {
+				fmt.Fprintf(buf, "**%s**\n\n", title)
+			}
 		}
 	}
 }
@@ -266,11 +311,13 @@ func (e *MarkdownExporter) processUnknownItem(buf *bytes.Buffer, item models.Ite
 // processGenericSubItem processes sub-items for unknown types.
 func (e *MarkdownExporter) processGenericSubItem(buf *bytes.Buffer, subItem models.SubItem) {
 	if subItem.Title != "" {
-		title := e.htmlCleaner.CleanHTML(subItem.Title)
-		fmt.Fprintf(buf, "**%s**\n\n", title)
+		if title := e.htmlCleaner.CleanAndTrim(subItem.Title); title != "" {
+			fmt.Fprintf(buf, "**%s**\n\n", title)
+		}
 	}
 	if subItem.Paragraph != "" {
-		paragraph := e.htmlCleaner.CleanHTML(subItem.Paragraph)
-		fmt.Fprintf(buf, "%s\n\n", paragraph)
+		if paragraph := e.htmlCleaner.CleanAndTrim(subItem.Paragraph); paragraph != "" {
+			fmt.Fprintf(buf, "%s\n\n", paragraph)
+		}
 	}
 }

internal/exporters/markdown_test.go

@@ -14,7 +14,7 @@ import (
 // TestNewMarkdownExporter tests the NewMarkdownExporter constructor.
 func TestNewMarkdownExporter(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewMarkdownExporter(htmlCleaner)
+	exporter := NewMarkdownExporter(htmlCleaner, nil)
 
 	if exporter == nil {
 		t.Fatal("NewMarkdownExporter() returned nil")
@@ -34,7 +34,7 @@ func TestNewMarkdownExporter(t *testing.T) {
 // TestMarkdownExporter_SupportedFormat tests the SupportedFormat method.
 func TestMarkdownExporter_SupportedFormat(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewMarkdownExporter(htmlCleaner)
+	exporter := NewMarkdownExporter(htmlCleaner, nil)
 
 	expected := "markdown"
 	result := exporter.SupportedFormat()
@@ -47,7 +47,7 @@ func TestMarkdownExporter_SupportedFormat(t *testing.T) {
 // TestMarkdownExporter_Export tests the Export method.
 func TestMarkdownExporter_Export(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewMarkdownExporter(htmlCleaner)
+	exporter := NewMarkdownExporter(htmlCleaner, nil)
 
 	// Create test course
 	testCourse := createTestCourseForMarkdown()
@@ -108,7 +108,7 @@ func TestMarkdownExporter_Export(t *testing.T) {
 // TestMarkdownExporter_Export_InvalidPath tests export with invalid output path.
 func TestMarkdownExporter_Export_InvalidPath(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewMarkdownExporter(htmlCleaner)
+	exporter := NewMarkdownExporter(htmlCleaner, nil)
 
 	testCourse := createTestCourseForMarkdown()
 
@@ -124,7 +124,7 @@ func TestMarkdownExporter_Export_InvalidPath(t *testing.T) {
 // TestMarkdownExporter_ProcessTextItem tests the processTextItem method.
 func TestMarkdownExporter_ProcessTextItem(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := &MarkdownExporter{htmlCleaner: htmlCleaner}
+	exporter := &MarkdownExporter{baseExporter: baseExporter{htmlCleaner: htmlCleaner}}
 
 	var buf bytes.Buffer
 	item := models.Item{
@@ -153,7 +153,7 @@ func TestMarkdownExporter_ProcessTextItem(t *testing.T) {
 // TestMarkdownExporter_ProcessListItem tests the processListItem method.
 func TestMarkdownExporter_ProcessListItem(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := &MarkdownExporter{htmlCleaner: htmlCleaner}
+	exporter := &MarkdownExporter{baseExporter: baseExporter{htmlCleaner: htmlCleaner}}
 
 	var buf bytes.Buffer
 	item := models.Item{
@@ -178,7 +178,7 @@ func TestMarkdownExporter_ProcessListItem(t *testing.T) {
 // TestMarkdownExporter_ProcessMultimediaItem tests the processMultimediaItem method.
 func TestMarkdownExporter_ProcessMultimediaItem(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := &MarkdownExporter{htmlCleaner: htmlCleaner}
+	exporter := &MarkdownExporter{baseExporter: baseExporter{htmlCleaner: htmlCleaner}}
 
 	var buf bytes.Buffer
 	item := models.Item{
@@ -217,7 +217,7 @@ func TestMarkdownExporter_ProcessMultimediaItem(t *testing.T) {
 // TestMarkdownExporter_ProcessImageItem tests the processImageItem method.
 func TestMarkdownExporter_ProcessImageItem(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := &MarkdownExporter{htmlCleaner: htmlCleaner}
+	exporter := &MarkdownExporter{baseExporter: baseExporter{htmlCleaner: htmlCleaner}}
 
 	var buf bytes.Buffer
 	item := models.Item{
@@ -252,7 +252,7 @@ func TestMarkdownExporter_ProcessImageItem(t *testing.T) {
 // TestMarkdownExporter_ProcessKnowledgeCheckItem tests the processKnowledgeCheckItem method.
 func TestMarkdownExporter_ProcessKnowledgeCheckItem(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := &MarkdownExporter{htmlCleaner: htmlCleaner}
+	exporter := &MarkdownExporter{baseExporter: baseExporter{htmlCleaner: htmlCleaner}}
 
 	var buf bytes.Buffer
 	item := models.Item{
@@ -283,7 +283,7 @@ func TestMarkdownExporter_ProcessKnowledgeCheckItem(t *testing.T) {
 	if !strings.Contains(result, "**Answers**:") {
 		t.Error("Should contain answers heading")
 	}
-	if !strings.Contains(result, "2. Paris ✓") {
+	if !strings.Contains(result, "2. Paris [correct]") {
 		t.Error("Should mark correct answer")
 	}
 	if !strings.Contains(result, "**Feedback**: Paris is the capital of France.") {
@@ -294,7 +294,7 @@ func TestMarkdownExporter_ProcessKnowledgeCheckItem(t *testing.T) {
 // TestMarkdownExporter_ProcessInteractiveItem tests the processInteractiveItem method.
 func TestMarkdownExporter_ProcessInteractiveItem(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := &MarkdownExporter{htmlCleaner: htmlCleaner}
+	exporter := &MarkdownExporter{baseExporter: baseExporter{htmlCleaner: htmlCleaner}}
 
 	var buf bytes.Buffer
 	item := models.Item{
@@ -319,7 +319,7 @@ func TestMarkdownExporter_ProcessInteractiveItem(t *testing.T) {
 // TestMarkdownExporter_ProcessDividerItem tests the processDividerItem method.
 func TestMarkdownExporter_ProcessDividerItem(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := &MarkdownExporter{htmlCleaner: htmlCleaner}
+	exporter := &MarkdownExporter{baseExporter: baseExporter{htmlCleaner: htmlCleaner}}
 
 	var buf bytes.Buffer
 	exporter.processDividerItem(&buf)
@@ -335,7 +335,7 @@ func TestMarkdownExporter_ProcessDividerItem(t *testing.T) {
 // TestMarkdownExporter_ProcessUnknownItem tests the processUnknownItem method.
 func TestMarkdownExporter_ProcessUnknownItem(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := &MarkdownExporter{htmlCleaner: htmlCleaner}
+	exporter := &MarkdownExporter{baseExporter: baseExporter{htmlCleaner: htmlCleaner}}
 
 	var buf bytes.Buffer
 	item := models.Item{
@@ -366,7 +366,7 @@ func TestMarkdownExporter_ProcessUnknownItem(t *testing.T) {
 // TestMarkdownExporter_ProcessVideoMedia tests the processVideoMedia method.
 func TestMarkdownExporter_ProcessVideoMedia(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := &MarkdownExporter{htmlCleaner: htmlCleaner}
+	exporter := &MarkdownExporter{baseExporter: baseExporter{htmlCleaner: htmlCleaner}}
 
 	var buf bytes.Buffer
 	media := &models.Media{
@@ -391,7 +391,7 @@ func TestMarkdownExporter_ProcessVideoMedia(t *testing.T) {
 // TestMarkdownExporter_ProcessImageMedia tests the processImageMedia method.
 func TestMarkdownExporter_ProcessImageMedia(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := &MarkdownExporter{htmlCleaner: htmlCleaner}
+	exporter := &MarkdownExporter{baseExporter: baseExporter{htmlCleaner: htmlCleaner}}
 
 	var buf bytes.Buffer
 	media := &models.Media{
@@ -413,7 +413,7 @@ func TestMarkdownExporter_ProcessImageMedia(t *testing.T) {
 // TestMarkdownExporter_ProcessAnswers tests the processAnswers method.
 func TestMarkdownExporter_ProcessAnswers(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := &MarkdownExporter{htmlCleaner: htmlCleaner}
+	exporter := &MarkdownExporter{baseExporter: baseExporter{htmlCleaner: htmlCleaner}}
 
 	var buf bytes.Buffer
 	answers := []models.Answer{
@@ -432,7 +432,7 @@ func TestMarkdownExporter_ProcessAnswers(t *testing.T) {
 	if !strings.Contains(result, "1. Answer 1") {
 		t.Error("Should contain first answer")
 	}
-	if !strings.Contains(result, "2. Answer 2 ✓") {
+	if !strings.Contains(result, "2. Answer 2 [correct]") {
 		t.Error("Should mark correct answer")
 	}
 	if !strings.Contains(result, "3. Answer 3") {
@@ -443,7 +443,7 @@ func TestMarkdownExporter_ProcessAnswers(t *testing.T) {
 // TestMarkdownExporter_ProcessItemToMarkdown_AllTypes tests all item types.
 func TestMarkdownExporter_ProcessItemToMarkdown_AllTypes(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := &MarkdownExporter{htmlCleaner: htmlCleaner}
+	exporter := &MarkdownExporter{baseExporter: baseExporter{htmlCleaner: htmlCleaner}}
 
 	tests := []struct {
 		name         string
@@ -510,7 +510,7 @@ func TestMarkdownExporter_ProcessItemToMarkdown_AllTypes(t *testing.T) {
 // TestMarkdownExporter_ComplexCourse tests export of a complex course structure.
 func TestMarkdownExporter_ComplexCourse(t *testing.T) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewMarkdownExporter(htmlCleaner)
+	exporter := NewMarkdownExporter(htmlCleaner, nil)
 
 	// Create complex test course
 	course := &models.Course{
@@ -603,7 +603,7 @@ func TestMarkdownExporter_ComplexCourse(t *testing.T) {
 		"- Second objective",
 		"### Knowledge Check",
 		"**Question**: What will you learn?",
-		"2. Everything ✓",
+		"2. Everything [correct]",
 		"**Feedback**: Great choice!",
 	}
 
@@ -654,7 +654,7 @@ func createTestCourseForMarkdown() *models.Course {
 // BenchmarkMarkdownExporter_Export benchmarks the Export method.
 func BenchmarkMarkdownExporter_Export(b *testing.B) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := NewMarkdownExporter(htmlCleaner)
+	exporter := NewMarkdownExporter(htmlCleaner, nil)
 	course := createTestCourseForMarkdown()
 
 	// Create temporary directory
@@ -673,7 +673,7 @@ func BenchmarkMarkdownExporter_Export(b *testing.B) {
 // BenchmarkMarkdownExporter_ProcessTextItem benchmarks the processTextItem method.
 func BenchmarkMarkdownExporter_ProcessTextItem(b *testing.B) {
 	htmlCleaner := services.NewHTMLCleaner()
-	exporter := &MarkdownExporter{htmlCleaner: htmlCleaner}
+	exporter := &MarkdownExporter{baseExporter: baseExporter{htmlCleaner: htmlCleaner}}
 
 	item := models.Item{
 		Type: "text",

internal/exporters/output.md

@@ -1,11 +0,0 @@
-# Example Course
-
-Course description
-
-## Course Information
-
-- **Course ID**:
-- **Share ID**: example-id
-- **Navigation Mode**:
-
----

internal/interfaces/html_cleaner.go

@@ -0,0 +1,13 @@
+package interfaces
+
+// HTMLCleaner defines the interface for cleaning HTML content.
+// Implementations convert HTML to plain text, stripping tags and decoding entities.
+type HTMLCleaner interface {
+	// CleanHTML removes HTML tags and decodes HTML entities from a string.
+	// Returns plain text suitable for non-HTML output formats.
+	CleanHTML(htmlStr string) string
+
+	// CleanAndTrim removes HTML tags, decodes entities, and trims whitespace.
+	// Convenience method combining CleanHTML with strings.TrimSpace.
+	CleanAndTrim(htmlStr string) string
+}

internal/models/course.go

@@ -2,6 +2,8 @@
 // These structures closely match the JSON format used by Articulate Rise.
 package models
 
+import "fmt"
+
 // Course represents the top-level structure of an Articulate Rise course.
 // It contains metadata and the actual course content.
 type Course struct {
@@ -45,6 +47,8 @@ type ExportSettings struct {
 
 // LabelSet contains customized labels used throughout the course.
 // This allows course creators to modify standard terminology.
+//
+// NOTE: Currently parsed but not used in export logic.
 type LabelSet struct {
 	// ID is the unique identifier for this label set
 	ID string `json:"id"`
@@ -53,3 +57,46 @@ type LabelSet struct {
 	// Labels is a mapping of label keys to their customized values
 	Labels map[string]string `json:"labels"`
 }
+
+// Validate checks whether the Course structure contains valid data.
+// It returns an error describing the first validation failure found,
+// or nil if the course is valid.
+//
+// Validation rules:
+//   - ShareID must not be empty
+//   - Course.ID must not be empty
+//   - Course.Title must not be empty
+//   - Each Lesson must have a non-empty ID and Title
+func (c *Course) Validate() error {
+	if c.ShareID == "" {
+		return &ValidationError{Field: "ShareID", Message: "share ID is required"}
+	}
+	if c.Course.ID == "" {
+		return &ValidationError{Field: "Course.ID", Message: "course ID is required"}
+	}
+	if c.Course.Title == "" {
+		return &ValidationError{Field: "Course.Title", Message: "course title is required"}
+	}
+	for i, lesson := range c.Course.Lessons {
+		if lesson.ID == "" {
+			return &ValidationError{Field: "Course.Lessons", Message: fmt.Sprintf("lesson at index %d has empty ID", i)}
+		}
+		if lesson.Title == "" {
+			return &ValidationError{Field: "Course.Lessons", Message: fmt.Sprintf("lesson at index %d has empty title", i)}
+		}
+	}
+	return nil
+}
+
+// ValidationError represents a validation failure for a specific field.
+type ValidationError struct {
+	// Field is the name of the field that failed validation
+	Field string
+	// Message describes the validation failure
+	Message string
+}
+
+// Error implements the error interface for ValidationError.
+func (e *ValidationError) Error() string {
+	return fmt.Sprintf("validation error on %s: %s", e.Field, e.Message)
+}

internal/models/item_types.go

@@ -0,0 +1,41 @@
+package models
+
+// Item type constants used throughout the application.
+// These match the type field values in Articulate Rise course data.
+const (
+	// ItemTypeText represents text content blocks with headings and paragraphs.
+	ItemTypeText = "text"
+
+	// ItemTypeList represents bullet or numbered list content.
+	ItemTypeList = "list"
+
+	// ItemTypeKnowledgeCheck represents quiz or assessment items.
+	ItemTypeKnowledgeCheck = "knowledgecheck"
+
+	// ItemTypeMultimedia represents video or audio content.
+	ItemTypeMultimedia = "multimedia"
+
+	// ItemTypeImage represents standalone image content.
+	ItemTypeImage = "image"
+
+	// ItemTypeInteractive represents interactive elements like accordions or tabs.
+	ItemTypeInteractive = "interactive"
+
+	// ItemTypeDivider represents visual separator elements.
+	ItemTypeDivider = "divider"
+
+	// ItemTypeQuote represents quotation blocks.
+	ItemTypeQuote = "quote"
+
+	// ItemTypeFlipcard represents flashcard-style content.
+	ItemTypeFlipcard = "flipcard"
+)
+
+// Lesson type constants.
+const (
+	// LessonTypeSection represents a section header (not a real lesson).
+	LessonTypeSection = "section"
+
+	// LessonTypeLesson represents a regular lesson.
+	LessonTypeLesson = "lesson"
+)

internal/models/lesson.go

@@ -15,7 +15,8 @@ type Lesson struct {
 	Icon string `json:"icon"`
 	// Items is an ordered array of content items within the lesson
 	Items []Item `json:"items"`
-	// Position stores the ordering information for the lesson
+	// Position stores the ordering information for the lesson.
+	// NOTE: Currently parsed but not used in export logic.
 	Position any `json:"position"`
 	// Ready indicates whether the lesson is marked as complete
 	Ready bool `json:"ready"`
@@ -38,9 +39,11 @@ type Item struct {
 	Variant string `json:"variant"`
 	// Items contains the actual content elements (sub-items) of this item
 	Items []SubItem `json:"items"`
-	// Settings contains configuration options specific to this item type
+	// Settings contains configuration options specific to this item type.
+	// NOTE: Currently parsed but not used in export logic.
 	Settings any `json:"settings"`
-	// Data contains additional structured data for the item
+	// Data contains additional structured data for the item.
+	// NOTE: Currently parsed but not used in export logic.
 	Data any `json:"data"`
 	// Media contains any associated media for the item
 	Media *Media `json:"media,omitempty"`

internal/models/models_test.go

@@ -2,6 +2,7 @@ package models
 
 import (
 	"encoding/json"
+	"errors"
 	"reflect"
 	"testing"
 )
@@ -664,6 +665,161 @@ func BenchmarkCourse_JSONUnmarshal(b *testing.B) {
 	}
 }
 
+// TestCourse_Validate tests the Course.Validate method.
+func TestCourse_Validate(t *testing.T) {
+	tests := []struct {
+		name      string
+		course    Course
+		wantErr   bool
+		errField  string
+		errSubstr string
+	}{
+		{
+			name: "valid course",
+			course: Course{
+				ShareID: "test-share-id",
+				Course: CourseInfo{
+					ID:    "course-123",
+					Title: "Test Course",
+					Lessons: []Lesson{
+						{ID: "lesson-1", Title: "First Lesson"},
+					},
+				},
+			},
+			wantErr: false,
+		},
+		{
+			name: "valid course with no lessons",
+			course: Course{
+				ShareID: "test-share-id",
+				Course: CourseInfo{
+					ID:      "course-123",
+					Title:   "Test Course",
+					Lessons: []Lesson{},
+				},
+			},
+			wantErr: false,
+		},
+		{
+			name: "missing share ID",
+			course: Course{
+				Course: CourseInfo{
+					ID:    "course-123",
+					Title: "Test Course",
+				},
+			},
+			wantErr:   true,
+			errField:  "ShareID",
+			errSubstr: "share ID is required",
+		},
+		{
+			name: "missing course ID",
+			course: Course{
+				ShareID: "test-share-id",
+				Course: CourseInfo{
+					Title: "Test Course",
+				},
+			},
+			wantErr:   true,
+			errField:  "Course.ID",
+			errSubstr: "course ID is required",
+		},
+		{
+			name: "missing course title",
+			course: Course{
+				ShareID: "test-share-id",
+				Course: CourseInfo{
+					ID: "course-123",
+				},
+			},
+			wantErr:   true,
+			errField:  "Course.Title",
+			errSubstr: "course title is required",
+		},
+		{
+			name: "lesson with empty ID",
+			course: Course{
+				ShareID: "test-share-id",
+				Course: CourseInfo{
+					ID:    "course-123",
+					Title: "Test Course",
+					Lessons: []Lesson{
+						{ID: "", Title: "First Lesson"},
+					},
+				},
+			},
+			wantErr:   true,
+			errField:  "Course.Lessons",
+			errSubstr: "lesson at index 0 has empty ID",
+		},
+		{
+			name: "lesson with empty title",
+			course: Course{
+				ShareID: "test-share-id",
+				Course: CourseInfo{
+					ID:    "course-123",
+					Title: "Test Course",
+					Lessons: []Lesson{
+						{ID: "lesson-1", Title: ""},
+					},
+				},
+			},
+			wantErr:   true,
+			errField:  "Course.Lessons",
+			errSubstr: "lesson at index 0 has empty title",
+		},
+		{
+			name: "second lesson invalid",
+			course: Course{
+				ShareID: "test-share-id",
+				Course: CourseInfo{
+					ID:    "course-123",
+					Title: "Test Course",
+					Lessons: []Lesson{
+						{ID: "lesson-1", Title: "First Lesson"},
+						{ID: "lesson-2", Title: ""},
+					},
+				},
+			},
+			wantErr:   true,
+			errField:  "Course.Lessons",
+			errSubstr: "lesson at index 1 has empty title",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := tt.course.Validate()
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Course.Validate() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if tt.wantErr {
+				var valErr *ValidationError
+				if ok := errors.As(err, &valErr); !ok {
+					t.Errorf("Expected ValidationError, got %T", err)
+					return
+				}
+				if valErr.Field != tt.errField {
+					t.Errorf("ValidationError.Field = %q, want %q", valErr.Field, tt.errField)
+				}
+				if valErr.Message != tt.errSubstr {
+					t.Errorf("ValidationError.Message = %q, want %q", valErr.Message, tt.errSubstr)
+				}
+			}
+		})
+	}
+}
+
+// TestValidationError_Error tests the ValidationError.Error method.
+func TestValidationError_Error(t *testing.T) {
+	err := &ValidationError{Field: "TestField", Message: "test message"}
+	expected := "validation error on TestField: test message"
+	if err.Error() != expected {
+		t.Errorf("ValidationError.Error() = %q, want %q", err.Error(), expected)
+	}
+}
+
 // compareMaps compares two any values that should be maps.
 func compareMaps(original, unmarshaled any) bool {
 	origMap, origOk := original.(map[string]any)

internal/services/app.go

@@ -6,6 +6,7 @@ import (
 	"context"
 	"fmt"
 
+	"github.com/kjanat/articulate-parser/internal/apperrors"
 	"github.com/kjanat/articulate-parser/internal/interfaces"
 	"github.com/kjanat/articulate-parser/internal/models"
 )
@@ -31,33 +32,46 @@ func NewApp(parser interfaces.CourseParser, exporterFactory interfaces.ExporterF
 }
 
 // ProcessCourseFromFile loads a course from a local file and exports it to the specified format.
-// It takes the path to the course file, the desired export format, and the output file path.
-// Returns an error if loading or exporting fails.
-func (a *App) ProcessCourseFromFile(filePath, format, outputPath string) error {
+// It takes a context for cancellation, the path to the course file, the desired export format,
+// and the output file path. Returns an error if loading or exporting fails, or if the context
+// is canceled.
+func (a *App) ProcessCourseFromFile(ctx context.Context, filePath, format, outputPath string) error {
+	// Check for cancellation before loading
+	if err := ctx.Err(); err != nil {
+		return fmt.Errorf("%w: %w", apperrors.ErrOperationCanceled, err)
+	}
+
 	course, err := a.parser.LoadCourseFromFile(filePath)
 	if err != nil {
 		return fmt.Errorf("failed to load course from file: %w", err)
 	}
 
-	return a.exportCourse(course, format, outputPath)
+	return a.exportCourse(ctx, course, format, outputPath)
 }
 
 // ProcessCourseFromURI fetches a course from the provided URI and exports it to the specified format.
-// It takes the URI to fetch the course from, the desired export format, and the output file path.
-// Returns an error if fetching or exporting fails.
+// It takes a context for cancellation, the URI to fetch the course from, the desired export format,
+// and the output file path. Returns an error if fetching or exporting fails, or if the context
+// is canceled.
 func (a *App) ProcessCourseFromURI(ctx context.Context, uri, format, outputPath string) error {
 	course, err := a.parser.FetchCourse(ctx, uri)
 	if err != nil {
 		return fmt.Errorf("failed to fetch course: %w", err)
 	}
 
-	return a.exportCourse(course, format, outputPath)
+	return a.exportCourse(ctx, course, format, outputPath)
 }
 
 // exportCourse exports a course to the specified format and output path.
 // It's a helper method that creates the appropriate exporter and performs the export.
-// Returns an error if creating the exporter or exporting the course fails.
-func (a *App) exportCourse(course *models.Course, format, outputPath string) error {
+// Returns an error if creating the exporter or exporting the course fails, or if the
+// context is canceled.
+func (a *App) exportCourse(ctx context.Context, course *models.Course, format, outputPath string) error {
+	// Check for cancellation before export
+	if err := ctx.Err(); err != nil {
+		return fmt.Errorf("%w: %w", apperrors.ErrOperationCanceled, err)
+	}
+
 	exporter, err := a.exporterFactory.CreateExporter(format)
 	if err != nil {
 		return fmt.Errorf("failed to create exporter: %w", err)

internal/services/app_test.go

@@ -207,7 +207,7 @@ func TestApp_ProcessCourseFromFile(t *testing.T) {
 			tt.setupMocks(parser, factory, exporter)
 
 			app := NewApp(parser, factory)
-			err := app.ProcessCourseFromFile(tt.filePath, tt.format, tt.outputPath)
+			err := app.ProcessCourseFromFile(context.Background(), tt.filePath, tt.format, tt.outputPath)
 
 			if tt.expectedError != "" {
 				if err == nil {

internal/services/example_test.go

@@ -5,7 +5,10 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"log/slog"
+	"time"
 
+	"github.com/kjanat/articulate-parser/internal/config"
 	"github.com/kjanat/articulate-parser/internal/services"
 )
 
@@ -14,8 +17,8 @@ func ExampleNewArticulateParser() {
 	// Create a no-op logger for this example
 	logger := services.NewNoOpLogger()
 
-	// Create parser with defaults
-	parser := services.NewArticulateParser(logger, "", 0)
+	// Create parser with defaults (nil config uses defaults)
+	parser := services.NewArticulateParser(logger, nil)
 
 	fmt.Printf("Parser created: %T\n", parser)
 	// Output: Parser created: *services.ArticulateParser
@@ -26,11 +29,11 @@ func ExampleNewArticulateParser_custom() {
 	logger := services.NewNoOpLogger()
 
 	// Create parser with custom base URL and timeout
-	parser := services.NewArticulateParser(
-		logger,
-		"https://custom.articulate.com",
-		60_000_000_000, // 60 seconds in nanoseconds
-	)
+	cfg := &config.Config{
+		BaseURL:        "https://custom.articulate.com",
+		RequestTimeout: 60 * time.Second,
+	}
+	parser := services.NewArticulateParser(logger, cfg)
 
 	fmt.Printf("Parser configured: %T\n", parser)
 	// Output: Parser configured: *services.ArticulateParser
@@ -39,7 +42,7 @@ func ExampleNewArticulateParser_custom() {
 // ExampleArticulateParser_LoadCourseFromFile demonstrates loading a course from a file.
 func ExampleArticulateParser_LoadCourseFromFile() {
 	logger := services.NewNoOpLogger()
-	parser := services.NewArticulateParser(logger, "", 0)
+	parser := services.NewArticulateParser(logger, nil)
 
 	// In a real scenario, you'd have an actual file
 	// This example shows the API usage
@@ -52,7 +55,7 @@ func ExampleArticulateParser_LoadCourseFromFile() {
 // ExampleArticulateParser_FetchCourse demonstrates fetching a course from a URI.
 func ExampleArticulateParser_FetchCourse() {
 	logger := services.NewNoOpLogger()
-	parser := services.NewArticulateParser(logger, "", 0)
+	parser := services.NewArticulateParser(logger, nil)
 
 	// Create a context with timeout
 	ctx := context.Background()
@@ -64,6 +67,54 @@ func ExampleArticulateParser_FetchCourse() {
 	}
 }
 
+// ExampleNewSlogLogger demonstrates creating a JSON logger.
+func ExampleNewSlogLogger() {
+	// Create a JSON structured logger at Info level
+	// Output goes to stdout in JSON format
+	logger := services.NewSlogLogger(slog.LevelInfo)
+
+	// Logger is ready to use - calls like logger.Info("msg") output JSON
+	fmt.Printf("Logger type: %T\n", logger)
+	// Output: Logger type: *services.SlogLogger
+}
+
+// ExampleNewTextLogger demonstrates creating a human-readable text logger.
+func ExampleNewTextLogger() {
+	// Create a text logger, more readable for development
+	logger := services.NewTextLogger(slog.LevelDebug)
+
+	// Logger is ready - calls like logger.Debug("msg") output text
+	fmt.Printf("Logger type: %T\n", logger)
+	// Output: Logger type: *services.SlogLogger
+}
+
+// ExampleNewNoOpLogger demonstrates creating a no-op logger for testing.
+func ExampleNewNoOpLogger() {
+	logger := services.NewNoOpLogger()
+
+	// All log calls are silently discarded
+	logger.Debug("this won't appear")
+	logger.Info("neither will this")
+	logger.Error("or this")
+
+	fmt.Println("Logging silently completed")
+	// Output: Logging silently completed
+}
+
+// ExampleSlogLogger_With demonstrates creating a child logger with context.
+func ExampleSlogLogger_With() {
+	logger := services.NewNoOpLogger()
+
+	// Create a child logger with additional context
+	requestLogger := logger.With("request_id", "abc123", "user", "john")
+
+	// All logs from requestLogger will include request_id and user
+	requestLogger.Info("processing request")
+
+	fmt.Printf("Child logger type: %T\n", requestLogger)
+	// Output: Child logger type: *services.NoOpLogger
+}
+
 // ExampleHTMLCleaner demonstrates cleaning HTML content.
 func ExampleHTMLCleaner() {
 	cleaner := services.NewHTMLCleaner()

internal/services/html_cleaner.go

@@ -7,13 +7,19 @@ import (
 	"strings"
 
 	"golang.org/x/net/html"
+
+	"github.com/kjanat/articulate-parser/internal/interfaces"
 )
 
 // HTMLCleaner provides utilities for converting HTML content to plain text.
 // It removes HTML tags while preserving their content and converts HTML entities
 // to their plain text equivalents using proper HTML parsing instead of regex.
+// Implements interfaces.HTMLCleaner.
 type HTMLCleaner struct{}
 
+// Compile-time check that HTMLCleaner implements interfaces.HTMLCleaner.
+var _ interfaces.HTMLCleaner = (*HTMLCleaner)(nil)
+
 // NewHTMLCleaner creates a new HTML cleaner instance.
 // This service is typically injected into exporters that need to handle
 // HTML content from Articulate Rise courses.
@@ -46,6 +52,13 @@ func (h *HTMLCleaner) CleanHTML(htmlStr string) string {
 	return strings.TrimSpace(cleaned)
 }
 
+// CleanAndTrim removes HTML tags, decodes entities, and trims whitespace.
+// Convenience method that combines CleanHTML with strings.TrimSpace.
+// Returns empty string if input is empty or contains only whitespace/tags.
+func (h *HTMLCleaner) CleanAndTrim(htmlStr string) string {
+	return strings.TrimSpace(h.CleanHTML(htmlStr))
+}
+
 // extractText recursively traverses the HTML node tree and extracts text content.
 // It skips script and style tags to avoid including their content in the output.
 func extractText(w io.Writer, n *html.Node) {

internal/services/logger_factory.go

@@ -0,0 +1,15 @@
+package services
+
+import (
+	"github.com/kjanat/articulate-parser/internal/config"
+	"github.com/kjanat/articulate-parser/internal/interfaces"
+)
+
+// NewLoggerFromConfig creates a logger based on the configuration.
+// Returns a JSON logger if cfg.LogFormat is "json", otherwise returns a text logger.
+func NewLoggerFromConfig(cfg *config.Config) interfaces.Logger {
+	if cfg.LogFormat == "json" {
+		return NewSlogLogger(cfg.LogLevel)
+	}
+	return NewTextLogger(cfg.LogLevel)
+}

internal/services/parser.go

@@ -9,12 +9,19 @@ import (
 	"net/url"
 	"os"
 	"regexp"
-	"time"
 
+	"github.com/kjanat/articulate-parser/internal/apperrors"
+	"github.com/kjanat/articulate-parser/internal/config"
 	"github.com/kjanat/articulate-parser/internal/interfaces"
 	"github.com/kjanat/articulate-parser/internal/models"
 )
 
+// riseHost is the only host accepted in Articulate Rise share URIs.
+const riseHost = "rise.articulate.com"
+
+// shareIDRegex is compiled once at package init for extracting share IDs from URIs.
+var shareIDRegex = regexp.MustCompile(`/share/([a-zA-Z0-9_-]+)`)
+
 // ArticulateParser implements the CourseParser interface specifically for Articulate Rise courses.
 // It can fetch courses from the Articulate Rise API or load them from local JSON files.
 type ArticulateParser struct {
@@ -26,23 +33,19 @@ type ArticulateParser struct {
 	Logger interfaces.Logger
 }
 
-// NewArticulateParser creates a new ArticulateParser instance.
-// If baseURL is empty, uses the default Articulate Rise API URL.
-// If timeout is zero, uses a 30-second timeout.
-func NewArticulateParser(logger interfaces.Logger, baseURL string, timeout time.Duration) interfaces.CourseParser {
+// NewArticulateParser creates a new ArticulateParser instance using the provided configuration.
+// If cfg is nil, a default configuration will be used.
+func NewArticulateParser(logger interfaces.Logger, cfg *config.Config) interfaces.CourseParser {
 	if logger == nil {
 		logger = NewNoOpLogger()
 	}
-	if baseURL == "" {
-		baseURL = "https://rise.articulate.com"
-	}
-	if timeout == 0 {
-		timeout = 30 * time.Second
+	if cfg == nil {
+		cfg = config.Load()
 	}
 	return &ArticulateParser{
-		BaseURL: baseURL,
+		BaseURL: cfg.BaseURL,
 		Client: &http.Client{
-			Timeout: timeout,
+			Timeout: cfg.RequestTimeout,
 		},
 		Logger: logger,
 	}
@@ -78,15 +81,15 @@ func (p *ArticulateParser) FetchCourse(ctx context.Context, uri string) (*models
 		}
 	}()
 
-	if resp.StatusCode != http.StatusOK {
-		return nil, fmt.Errorf("API returned status %d", resp.StatusCode)
-	}
-
 	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read response body: %w", err)
 	}
 
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("API returned status %d: %s", resp.StatusCode, string(body))
+	}
+
 	var course models.Course
 	if err := json.Unmarshal(body, &course); err != nil {
 		return nil, fmt.Errorf("failed to unmarshal JSON: %w", err)
@@ -125,18 +128,17 @@ func (p *ArticulateParser) extractShareID(uri string) (string, error) {
 	// Parse the URL to validate the domain
 	parsedURL, err := url.Parse(uri)
 	if err != nil {
-		return "", fmt.Errorf("invalid URI: %s", uri)
+		return "", fmt.Errorf("%w: %s", apperrors.ErrInvalidURI, uri)
 	}
 
 	// Validate that it's an Articulate Rise domain
-	if parsedURL.Host != "rise.articulate.com" {
-		return "", fmt.Errorf("invalid domain for Articulate Rise URI: %s", parsedURL.Host)
+	if parsedURL.Host != riseHost {
+		return "", fmt.Errorf("%w: %s", apperrors.ErrInvalidDomain, parsedURL.Host)
 	}
 
-	re := regexp.MustCompile(`/share/([a-zA-Z0-9_-]+)`)
-	matches := re.FindStringSubmatch(uri)
+	matches := shareIDRegex.FindStringSubmatch(uri)
 	if len(matches) < 2 {
-		return "", fmt.Errorf("could not extract share ID from URI: %s", uri)
+		return "", fmt.Errorf("%w: %s", apperrors.ErrNoShareID, uri)
 	}
 	return matches[1], nil
 }

internal/services/parser_bench_test.go

@@ -8,7 +8,9 @@ import (
 	"os"
 	"path/filepath"
 	"testing"
+	"time"
 
+	"github.com/kjanat/articulate-parser/internal/config"
 	"github.com/kjanat/articulate-parser/internal/models"
 )
 
@@ -133,7 +135,11 @@ func BenchmarkArticulateParser_LoadCourseFromFile(b *testing.B) {
 		b.Fatalf("Failed to write file: %v", err)
 	}
 
-	parser := NewArticulateParser(nil, "", 0)
+	cfg := &config.Config{
+		BaseURL:        "https://rise.articulate.com",
+		RequestTimeout: 30 * time.Second,
+	}
+	parser := NewArticulateParser(nil, cfg)
 
 	b.ResetTimer()
 	for b.Loop() {
@@ -180,7 +186,11 @@ func BenchmarkArticulateParser_LoadCourseFromFile_Large(b *testing.B) {
 		b.Fatalf("Failed to write file: %v", err)
 	}
 
-	parser := NewArticulateParser(nil, "", 0)
+	cfg := &config.Config{
+		BaseURL:        "https://rise.articulate.com",
+		RequestTimeout: 30 * time.Second,
+	}
+	parser := NewArticulateParser(nil, cfg)
 
 	b.ResetTimer()
 	for b.Loop() {

internal/services/parser_fuzz_test.go

@@ -0,0 +1,207 @@
+package services
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/kjanat/articulate-parser/internal/models"
+)
+
+// FuzzArticulateParser_ParseJSON fuzzes JSON parsing to ensure no panics on malformed input.
+// It tests that the parser gracefully handles any byte sequence without crashing.
+func FuzzArticulateParser_ParseJSON(f *testing.F) {
+	// Add seed corpus with valid JSON structures
+	f.Add([]byte(`{"shareId":"test","course":{"id":"1","title":"Test"}}`))
+	f.Add([]byte(`{"shareId":"abc123","author":"John Doe","course":{"id":"c1","title":"Course Title","description":"A test course"}}`))
+	f.Add([]byte(`{}`))
+	f.Add([]byte(`{"course":{}}`))
+	f.Add([]byte(`{"shareId":"","course":{"id":"","title":"","lessons":[]}}`))
+
+	// Add seed corpus with invalid/edge case inputs
+	f.Add([]byte(`invalid`))
+	f.Add([]byte(``))
+	f.Add([]byte(`null`))
+	f.Add([]byte(`[]`))
+	f.Add([]byte(`"string"`))
+	f.Add([]byte(`123`))
+	f.Add([]byte(`true`))
+	f.Add([]byte(`{`))
+	f.Add([]byte(`}`))
+	f.Add([]byte(`{"unclosed": `))
+	f.Add([]byte(`{"key": "value with \x00 null byte"}`))
+
+	// Add seed corpus with nested structures
+	f.Add([]byte(`{"course":{"lessons":[{"id":"l1","title":"Lesson 1","items":[{"id":"i1","type":"text","data":"content"}]}]}}`))
+	f.Add([]byte(`{"course":{"lessons":[{},{},{}]}}`))
+
+	// Add seed corpus with special characters
+	f.Add([]byte(`{"shareId":"test<script>alert('xss')</script>"}`))
+	f.Add([]byte(`{"course":{"title":"Test\n\r\t\u0000Title"}}`))
+	f.Add([]byte(`{"course":{"description":"<p>HTML content</p>"}}`))
+
+	f.Fuzz(func(t *testing.T, data []byte) {
+		// Test that unmarshaling doesn't panic
+		var course models.Course
+		_ = json.Unmarshal(data, &course)
+
+		// Also test that re-marshaling doesn't panic
+		_, _ = json.Marshal(&course)
+
+		// Test accessing fields doesn't panic
+		_ = course.ShareID
+		_ = course.Author
+		_ = course.Course.ID
+		_ = course.Course.Title
+		_ = course.Course.Description
+
+		// Test iterating over lessons doesn't panic
+		for _, lesson := range course.Course.Lessons {
+			_ = lesson.ID
+			_ = lesson.Title
+			for _, item := range lesson.Items {
+				_ = item.ID
+				_ = item.Type
+			}
+		}
+	})
+}
+
+// FuzzArticulateParser_LoadCourseFromFile_JSON tests JSON parsing behavior used by LoadCourseFromFile.
+// This fuzz test ensures the JSON unmarshaling logic handles arbitrary input gracefully.
+func FuzzArticulateParser_LoadCourseFromFile_JSON(f *testing.F) {
+	// Seed corpus mimicking file contents
+	f.Add([]byte(`{"shareId":"file-test","course":{"id":"1","title":"From File"}}`))
+	f.Add([]byte(`{
+		"shareId": "multiline",
+		"course": {
+			"id": "2",
+			"title": "Multiline JSON"
+		}
+	}`))
+	f.Add([]byte("\xef\xbb\xbf{\"shareId\":\"bom\"}")) // UTF-8 BOM prefix
+	f.Add([]byte(`{"shareId": "spaces",  "course":  {}}`))
+
+	f.Fuzz(func(t *testing.T, data []byte) {
+		var course models.Course
+		err := json.Unmarshal(data, &course)
+
+		// If unmarshaling succeeded, verify the result is usable
+		if err == nil {
+			// Access all fields to ensure no panics on zero values
+			_ = course.ShareID
+			_ = course.Author
+			_ = course.Course.ID
+			_ = course.Course.Title
+
+			// Iterate through nested structures
+			for _, lesson := range course.Course.Lessons {
+				_ = lesson.ID
+				_ = lesson.Title
+				_ = lesson.Type
+				for _, item := range lesson.Items {
+					_ = item.ID
+					_ = item.Type
+					_ = item.Data
+				}
+			}
+		}
+	})
+}
+
+// FuzzHTMLCleaner_CleanHTML fuzzes the HTML cleaner to ensure no panics on malformed HTML.
+// It tests that arbitrary HTML-like input is handled gracefully.
+func FuzzHTMLCleaner_CleanHTML(f *testing.F) {
+	cleaner := NewHTMLCleaner()
+
+	// Add seed corpus with valid HTML patterns
+	f.Add("<p>Simple paragraph</p>")
+	f.Add("<div><p>Nested</p></div>")
+	f.Add("<h1>Title</h1><p>Content</p>")
+	f.Add("<strong>Bold</strong> and <em>italic</em>")
+	f.Add("<a href=\"https://example.com\">Link</a>")
+	f.Add("<img src=\"image.png\" alt=\"Image\"/>")
+	f.Add("<br/><hr/>")
+	f.Add("<ul><li>Item 1</li><li>Item 2</li></ul>")
+	f.Add("<table><tr><td>Cell</td></tr></table>")
+
+	// Add seed corpus with HTML entities
+	f.Add("AT&amp;T")
+	f.Add("&lt;script&gt;alert('xss')&lt;/script&gt;")
+	f.Add("&nbsp;&nbsp;&nbsp;")
+	f.Add("&#39;apostrophe&#39;")
+	f.Add("&quot;quoted&quot;")
+	f.Add("&eacute;&iuml;&ouml;")
+	f.Add("&#x27;hex entity&#x27;")
+	f.Add("&#8217;numeric entity&#8217;")
+
+	// Add seed corpus with malformed/edge case HTML
+	f.Add("")
+	f.Add("plain text no HTML")
+	f.Add("<p>Unclosed paragraph")
+	f.Add("</p>Close tag first<p>")
+	f.Add("<div><div><div>Deep nesting")
+	f.Add("<script>alert('xss')</script>")
+	f.Add("<style>body{color:red}</style>")
+	f.Add("<!--comment-->")
+	f.Add("<!DOCTYPE html>")
+	f.Add("<![CDATA[data]]>")
+	f.Add("<p class=\"test\" id='test' data-attr=unquoted>Attributes</p>")
+	f.Add("<p\n\t>Whitespace in tag</p\n>")
+	f.Add("<>empty tag</>")
+	f.Add("<<<nested angles>>>")
+	f.Add("<p onclick=\"evil()\">Event handler</p>")
+
+	// Add seed corpus with special characters
+	f.Add("<p>\x00null byte</p>")
+	f.Add("<p>\xffhigh byte</p>")
+	f.Add("<p>emoji: \xf0\x9f\x98\x80</p>")
+	f.Add("<p>unicode: \u2603</p>")
+	f.Add("<p>newlines\n\r\nand\rtabs\there</p>")
+
+	// Add seed corpus with potentially problematic patterns
+	f.Add(string(make([]byte, 0)))                     // Empty
+	f.Add(string(make([]byte, 1)))                     // Single null byte
+	f.Add("<" + string(make([]byte, 100)) + ">")       // Tag with null bytes
+	f.Add("<p>" + string(make([]byte, 1000)) + "</p>") // Large content
+
+	f.Fuzz(func(t *testing.T, input string) {
+		// Test that CleanHTML doesn't panic on any input
+		result := cleaner.CleanHTML(input)
+
+		// Verify the result is a valid string (doesn't panic on access)
+		_ = len(result)
+
+		// Test that the result can be used in common string operations without panic
+		_ = result == ""
+		_ = result == input
+
+		// Test that calling CleanHTML on its own output doesn't panic (idempotency check)
+		_ = cleaner.CleanHTML(result)
+	})
+}
+
+// FuzzHTMLCleaner_CleanHTML_Bytes tests HTML cleaner with raw byte sequences.
+// This catches issues with invalid UTF-8 and binary data in HTML content.
+func FuzzHTMLCleaner_CleanHTML_Bytes(f *testing.F) {
+	cleaner := NewHTMLCleaner()
+
+	// Add seed corpus with byte sequences
+	f.Add([]byte("<p>normal</p>"))
+	f.Add([]byte{0x3c, 0x70, 0x3e, 0xff, 0xfe, 0x3c, 0x2f, 0x70, 0x3e})       // <p>..invalid..</p>
+	f.Add([]byte{0x00})                                                       // Null byte
+	f.Add([]byte{0xff, 0xfe})                                                 // Invalid UTF-8
+	f.Add([]byte{0xef, 0xbb, 0xbf, 0x3c, 0x70, 0x3e, 0x3c, 0x2f, 0x70, 0x3e}) // UTF-8 BOM + <p></p>
+	f.Add([]byte("<p>\xc0\xaf</p>"))                                          // Overlong UTF-8
+
+	f.Fuzz(func(t *testing.T, data []byte) {
+		// Convert bytes to string and test
+		input := string(data)
+
+		// Test that CleanHTML doesn't panic
+		result := cleaner.CleanHTML(input)
+
+		// Verify result is usable
+		_ = len(result)
+		_ = []byte(result)
+	})
+}

internal/services/parser_test.go

@@ -11,12 +11,14 @@ import (
 	"testing"
 	"time"
 
+	"github.com/kjanat/articulate-parser/internal/config"
 	"github.com/kjanat/articulate-parser/internal/models"
 )
 
 // TestNewArticulateParser tests the NewArticulateParser constructor.
 func TestNewArticulateParser(t *testing.T) {
-	parser := NewArticulateParser(nil, "", 0)
+	// Test with nil config (should use defaults)
+	parser := NewArticulateParser(nil, nil)
 
 	if parser == nil {
 		t.Fatal("NewArticulateParser() returned nil")
@@ -212,7 +214,11 @@ func TestArticulateParser_LoadCourseFromFile(t *testing.T) {
 		t.Fatalf("Failed to write test file: %v", err)
 	}
 
-	parser := NewArticulateParser(nil, "", 0)
+	cfg := &config.Config{
+		BaseURL:        "https://rise.articulate.com",
+		RequestTimeout: 30 * time.Second,
+	}
+	parser := NewArticulateParser(nil, cfg)
 
 	tests := []struct {
 		name          string
@@ -271,7 +277,11 @@ func TestArticulateParser_LoadCourseFromFile_InvalidJSON(t *testing.T) {
 		t.Fatalf("Failed to write test file: %v", err)
 	}
 
-	parser := NewArticulateParser(nil, "", 0)
+	cfg := &config.Config{
+		BaseURL:        "https://rise.articulate.com",
+		RequestTimeout: 30 * time.Second,
+	}
+	parser := NewArticulateParser(nil, cfg)
 	_, err := parser.LoadCourseFromFile(tempFile)
 
 	if err == nil {

internal/testdata/fixtures.go

@@ -0,0 +1,467 @@
+// Package testdata provides shared test fixtures for Articulate Rise course testing.
+// It contains builders for creating Course, Lesson, and Item structures with various
+// configurations to support unit tests, integration tests, and benchmarks.
+package testdata
+
+import (
+	"fmt"
+
+	"github.com/kjanat/articulate-parser/internal/models"
+)
+
+// SampleAnswers provides a reusable set of quiz answers for testing.
+var SampleAnswers = []models.Answer{
+	{ID: "ans-1", Title: "Option A", Correct: false},
+	{ID: "ans-2", Title: "Option B", Correct: true},
+	{ID: "ans-3", Title: "Option C", Correct: false},
+	{ID: "ans-4", Title: "Option D", Correct: false},
+}
+
+// SampleSubItems provides a reusable set of sub-items for testing.
+var SampleSubItems = []models.SubItem{
+	{
+		ID:        "sub-1",
+		Heading:   "Sample Heading",
+		Paragraph: "<p>Sample paragraph with <strong>formatting</strong>.</p>",
+	},
+	{
+		ID:        "sub-2",
+		Paragraph: "<p>Another paragraph with <em>emphasis</em>.</p>",
+	},
+}
+
+// MinimalCourse returns a course with just ShareID and Title set.
+// Useful for testing edge cases with minimal data.
+func MinimalCourse() *models.Course {
+	return &models.Course{
+		ShareID: "minimal-share-id",
+		Course: models.CourseInfo{
+			Title: "Minimal Course",
+		},
+	}
+}
+
+// BasicCourse returns a course with 1 section, 1 lesson, and 1 text item.
+// Suitable for basic functionality tests.
+func BasicCourse() *models.Course {
+	return &models.Course{
+		ShareID: "basic-share-id",
+		Author:  "Test Author",
+		Course: models.CourseInfo{
+			ID:             "basic-course-id",
+			Title:          "Basic Test Course",
+			Description:    "<p>A basic course for testing.</p>",
+			NavigationMode: "menu",
+			Lessons: []models.Lesson{
+				{
+					ID:    "section-1",
+					Title: "Introduction Section",
+					Type:  "section",
+				},
+				{
+					ID:          "lesson-1",
+					Title:       "First Lesson",
+					Type:        "lesson",
+					Description: "<p>Lesson introduction text.</p>",
+					Items: []models.Item{
+						TextItem("Welcome", "<p>Welcome to the course!</p>"),
+					},
+				},
+			},
+		},
+	}
+}
+
+// CompleteCourse returns a course with all item types represented.
+// Useful for comprehensive export and parsing tests.
+func CompleteCourse() *models.Course {
+	return &models.Course{
+		ShareID: "complete-share-id",
+		Author:  "Complete Test Author",
+		Course: models.CourseInfo{
+			ID:             "complete-course-id",
+			Title:          "Complete Test Course",
+			Description:    "<p>A comprehensive course with <strong>all</strong> item types.</p>",
+			Color:          "#3366CC",
+			NavigationMode: "menu",
+			ExportSettings: &models.ExportSettings{
+				Title:  "Exported Complete Course",
+				Format: "scorm",
+			},
+			CoverImage: &models.Media{
+				Image: &models.ImageMedia{
+					Key:         "cover-img-key",
+					Type:        "jpg",
+					Width:       1920,
+					Height:      1080,
+					OriginalURL: "https://example.com/cover.jpg",
+				},
+			},
+			Lessons: []models.Lesson{
+				{
+					ID:    "section-1",
+					Title: "Course Overview",
+					Type:  "section",
+				},
+				{
+					ID:          "lesson-1",
+					Title:       "Introduction",
+					Type:        "lesson",
+					Description: "<p>Introduction to the course content.</p>",
+					Icon:        "book",
+					Items: []models.Item{
+						TextItem("Welcome", "<p>Welcome to this comprehensive course!</p>"),
+						TextItem("Objectives", "<p>In this course you will learn:</p>"),
+						ListItem("First objective", "Second objective", "Third objective"),
+						DividerItem(),
+						MediaItem("video", "https://example.com/intro.mp4"),
+						MediaItem("image", "https://example.com/diagram.png"),
+					},
+				},
+				{
+					ID:          "lesson-2",
+					Title:       "Core Concepts",
+					Type:        "lesson",
+					Description: "<p>Core concepts and fundamentals.</p>",
+					Items: []models.Item{
+						TextItem("Key Concepts", "<p>Let's explore the key concepts.</p>"),
+						KnowledgeCheckItem("What is the primary purpose of this course?", []models.Answer{
+							{ID: "kc-1-a", Title: "Learning basics", Correct: false},
+							{ID: "kc-1-b", Title: "Comprehensive understanding", Correct: true},
+							{ID: "kc-1-c", Title: "Quick overview", Correct: false},
+						}),
+						InteractiveItem("Interactive Exercise"),
+					},
+				},
+				{
+					ID:          "lesson-3",
+					Title:       "Advanced Topics",
+					Type:        "lesson",
+					Description: "<p>Deep dive into advanced topics.</p>",
+					Items: []models.Item{
+						TextItem("Advanced Section", "<p>This section covers advanced material.</p>"),
+						FlipCardItem("Front content", "Back content"),
+						QuoteItem("Learning is not attained by chance.", "Abigail Adams"),
+					},
+				},
+				{
+					ID:    "section-2",
+					Title: "Summary",
+					Type:  "section",
+				},
+				{
+					ID:          "lesson-4",
+					Title:       "Conclusion",
+					Type:        "lesson",
+					Description: "<p>Course wrap-up and next steps.</p>",
+					Items: []models.Item{
+						TextItem("Summary", "<p>Thank you for completing this course!</p>"),
+						ListItem("Review materials regularly", "Practice learned skills", "Share knowledge"),
+					},
+				},
+			},
+		},
+		LabelSet: models.LabelSet{
+			ID:   "default-labels",
+			Name: "Default",
+			Labels: map[string]string{
+				"next":     "Next",
+				"previous": "Previous",
+				"complete": "Mark Complete",
+			},
+		},
+	}
+}
+
+// LargeCourse returns a parameterized course for benchmarking with the specified number of lessons.
+// Each lesson contains multiple item types for realistic performance testing.
+func LargeCourse(lessons int) *models.Course {
+	courseLessons := make([]models.Lesson, 0, lessons+lessons/5) // +sections
+
+	for i := range lessons {
+		// Add section header every 5 lessons
+		if i%5 == 0 {
+			courseLessons = append(courseLessons, models.Lesson{
+				ID:    fmt.Sprintf("section-%d", i/5+1),
+				Title: fmt.Sprintf("Section %d", i/5+1),
+				Type:  "section",
+			})
+		}
+
+		lesson := models.Lesson{
+			ID:          fmt.Sprintf("lesson-%d", i+1),
+			Title:       fmt.Sprintf("Lesson %d", i+1),
+			Type:        "lesson",
+			Description: fmt.Sprintf("<p>Description for lesson %d with <em>formatting</em>.</p>", i+1),
+			Items: []models.Item{
+				TextItem(
+					fmt.Sprintf("Heading %d", i+1),
+					fmt.Sprintf("<p>Content for lesson %d with <strong>bold</strong> and <em>italic</em> text.</p>", i+1),
+				),
+				ListItem("Point 1", "Point 2", "Point 3"),
+				KnowledgeCheckItem(
+					fmt.Sprintf("Quiz Question %d", i+1),
+					[]models.Answer{
+						{ID: fmt.Sprintf("q%d-a", i), Title: "Answer A", Correct: false},
+						{ID: fmt.Sprintf("q%d-b", i), Title: "Answer B", Correct: true},
+						{ID: fmt.Sprintf("q%d-c", i), Title: "Answer C", Correct: false},
+					},
+				),
+			},
+		}
+		courseLessons = append(courseLessons, lesson)
+	}
+
+	return &models.Course{
+		ShareID: "large-benchmark-id",
+		Author:  "Benchmark Author",
+		Course: models.CourseInfo{
+			ID:             "large-benchmark-course",
+			Title:          fmt.Sprintf("Large Benchmark Course (%d lessons)", lessons),
+			Description:    "<p>Large course for performance testing.</p>",
+			NavigationMode: "menu",
+			Lessons:        courseLessons,
+		},
+	}
+}
+
+// TextItem creates a text item with the specified heading and paragraph content.
+func TextItem(heading, paragraph string) models.Item {
+	return models.Item{
+		Type:   "text",
+		Family: "text",
+		Items: []models.SubItem{
+			{
+				ID:        "text-sub-1",
+				Heading:   heading,
+				Paragraph: paragraph,
+			},
+		},
+	}
+}
+
+// ListItem creates a list item with the specified items as list entries.
+func ListItem(items ...string) models.Item {
+	subItems := make([]models.SubItem, len(items))
+	for i, item := range items {
+		subItems[i] = models.SubItem{
+			ID:        fmt.Sprintf("list-sub-%d", i+1),
+			Paragraph: fmt.Sprintf("<p>%s</p>", item),
+		}
+	}
+
+	return models.Item{
+		Type:   "list",
+		Family: "list",
+		Items:  subItems,
+	}
+}
+
+// KnowledgeCheckItem creates a knowledge check item with the specified question and answers.
+func KnowledgeCheckItem(question string, answers []models.Answer) models.Item {
+	return models.Item{
+		Type:   "knowledgeCheck",
+		Family: "knowledge",
+		Items: []models.SubItem{
+			{
+				ID:       "kc-sub-1",
+				Title:    fmt.Sprintf("<p>%s</p>", question),
+				Answers:  answers,
+				Feedback: "<p>Thank you for your response.</p>",
+			},
+		},
+	}
+}
+
+// MediaItem creates a media item (video or image) with the specified type and URL.
+// The mediaType should be "video" or "image".
+func MediaItem(mediaType, url string) models.Item {
+	var media *models.Media
+
+	switch mediaType {
+	case "video":
+		media = &models.Media{
+			Video: &models.VideoMedia{
+				Key:         "video-key",
+				URL:         url,
+				Type:        "mp4",
+				Duration:    120,
+				OriginalURL: url,
+			},
+		}
+	case "image":
+		media = &models.Media{
+			Image: &models.ImageMedia{
+				Key:         "image-key",
+				Type:        "png",
+				Width:       800,
+				Height:      600,
+				OriginalURL: url,
+			},
+		}
+	default:
+		media = &models.Media{}
+	}
+
+	return models.Item{
+		Type:   "multimedia",
+		Family: "media",
+		Items: []models.SubItem{
+			{
+				ID:      "media-sub-1",
+				Title:   fmt.Sprintf("<p>%s content</p>", mediaType),
+				Caption: fmt.Sprintf("<p>Caption for %s</p>", mediaType),
+				Media:   media,
+			},
+		},
+	}
+}
+
+// InteractiveItem creates an interactive content item with the specified title.
+func InteractiveItem(title string) models.Item {
+	return models.Item{
+		Type:   "interactive",
+		Family: "interactive",
+		Items: []models.SubItem{
+			{
+				ID:    "interactive-sub-1",
+				Title: fmt.Sprintf("<p>%s</p>", title),
+			},
+		},
+	}
+}
+
+// DividerItem creates a divider/separator item.
+func DividerItem() models.Item {
+	return models.Item{
+		Type:   "divider",
+		Family: "divider",
+	}
+}
+
+// FlipCardItem creates a flashcard-style item with front and back content.
+func FlipCardItem(front, back string) models.Item {
+	return models.Item{
+		Type:   "flashcard",
+		Family: "interactive",
+		Items: []models.SubItem{
+			{
+				ID: "flipcard-sub-1",
+				Front: &models.CardSide{
+					Description: fmt.Sprintf("<p>%s</p>", front),
+				},
+				Back: &models.CardSide{
+					Description: fmt.Sprintf("<p>%s</p>", back),
+				},
+			},
+		},
+	}
+}
+
+// QuoteItem creates a quote/blockquote item with text and attribution.
+func QuoteItem(quote, author string) models.Item {
+	return models.Item{
+		Type:   "quote",
+		Family: "text",
+		Items: []models.SubItem{
+			{
+				ID:        "quote-sub-1",
+				Paragraph: fmt.Sprintf("<blockquote>%s</blockquote>", quote),
+				Title:     author,
+			},
+		},
+	}
+}
+
+// ImageItem creates a standalone image item with caption.
+func ImageItem(url, caption string) models.Item {
+	return models.Item{
+		Type:   "image",
+		Family: "media",
+		Items: []models.SubItem{
+			{
+				ID:      "image-sub-1",
+				Caption: fmt.Sprintf("<p>%s</p>", caption),
+				Media: &models.Media{
+					Image: &models.ImageMedia{
+						Key:         "standalone-img-key",
+						Type:        "jpg",
+						Width:       1200,
+						Height:      800,
+						OriginalURL: url,
+					},
+				},
+			},
+		},
+	}
+}
+
+// VideoItem creates a standalone video item with caption.
+func VideoItem(url string, duration int, caption string) models.Item {
+	return models.Item{
+		Type:   "video",
+		Family: "media",
+		Items: []models.SubItem{
+			{
+				ID:      "video-sub-1",
+				Caption: fmt.Sprintf("<p>%s</p>", caption),
+				Media: &models.Media{
+					Video: &models.VideoMedia{
+						Key:         "standalone-video-key",
+						URL:         url,
+						Type:        "mp4",
+						Duration:    duration,
+						OriginalURL: url,
+					},
+				},
+			},
+		},
+	}
+}
+
+// MatchingItem creates a matching/pairing knowledge check item.
+func MatchingItem(pairs map[string]string) models.Item {
+	answers := make([]models.Answer, 0, len(pairs))
+	i := 0
+	for term, match := range pairs {
+		answers = append(answers, models.Answer{
+			ID:         fmt.Sprintf("match-%d", i),
+			Title:      term,
+			MatchTitle: match,
+			Correct:    true,
+		})
+		i++
+	}
+
+	return models.Item{
+		Type:   "matching",
+		Family: "knowledge",
+		Items: []models.SubItem{
+			{
+				ID:       "matching-sub-1",
+				Title:    "<p>Match the following items:</p>",
+				Answers:  answers,
+				Feedback: "<p>Check your matches!</p>",
+			},
+		},
+	}
+}
+
+// EmptyLesson returns a lesson with no items for edge case testing.
+func EmptyLesson(id, title string) models.Lesson {
+	return models.Lesson{
+		ID:    id,
+		Title: title,
+		Type:  "lesson",
+		Items: []models.Item{},
+	}
+}
+
+// SectionLesson returns a section header (not a content lesson).
+func SectionLesson(id, title string) models.Lesson {
+	return models.Lesson{
+		ID:    id,
+		Title: title,
+		Type:  "section",
+	}
+}

internal/testdata/fixtures_test.go

@@ -0,0 +1,273 @@
+package testdata
+
+import (
+	"testing"
+
+	"github.com/kjanat/articulate-parser/internal/models"
+)
+
+func TestMinimalCourse(t *testing.T) {
+	course := MinimalCourse()
+	if course == nil {
+		t.Fatal("MinimalCourse() returned nil")
+	}
+	if course.ShareID == "" {
+		t.Error("MinimalCourse() should have ShareID set")
+	}
+	if course.Course.Title == "" {
+		t.Error("MinimalCourse() should have Title set")
+	}
+}
+
+func TestBasicCourse(t *testing.T) {
+	course := BasicCourse()
+	if course == nil {
+		t.Fatal("BasicCourse() returned nil")
+	}
+	if len(course.Course.Lessons) != 2 {
+		t.Errorf("BasicCourse() should have 2 lessons, got %d", len(course.Course.Lessons))
+	}
+	if course.Course.Lessons[0].Type != "section" {
+		t.Error("First lesson should be a section")
+	}
+	if course.Course.Lessons[1].Type != "lesson" {
+		t.Error("Second lesson should be a lesson")
+	}
+	if len(course.Course.Lessons[1].Items) != 1 {
+		t.Errorf("Lesson should have 1 item, got %d", len(course.Course.Lessons[1].Items))
+	}
+}
+
+func TestCompleteCourse(t *testing.T) {
+	course := CompleteCourse()
+	if course == nil {
+		t.Fatal("CompleteCourse() returned nil")
+	}
+	if len(course.Course.Lessons) == 0 {
+		t.Error("CompleteCourse() should have lessons")
+	}
+
+	// Verify all expected item types exist
+	itemTypes := make(map[string]bool)
+	for _, lesson := range course.Course.Lessons {
+		for _, item := range lesson.Items {
+			itemTypes[item.Type] = true
+		}
+	}
+
+	expectedTypes := []string{"text", "list", "divider", "multimedia", "knowledgeCheck", "interactive", "flashcard", "quote"}
+	for _, et := range expectedTypes {
+		if !itemTypes[et] {
+			t.Errorf("CompleteCourse() should have item type %q", et)
+		}
+	}
+}
+
+func TestLargeCourse(t *testing.T) {
+	tests := []struct {
+		lessons  int
+		expected int
+	}{
+		{1, 2},   // 1 lesson + 1 section
+		{5, 6},   // 5 lessons + 1 section
+		{10, 12}, // 10 lessons + 2 sections
+		{50, 60}, // 50 lessons + 10 sections
+	}
+
+	for _, tt := range tests {
+		course := LargeCourse(tt.lessons)
+		if course == nil {
+			t.Fatalf("LargeCourse(%d) returned nil", tt.lessons)
+		}
+		if len(course.Course.Lessons) != tt.expected {
+			t.Errorf("LargeCourse(%d) should have %d lessons+sections, got %d",
+				tt.lessons, tt.expected, len(course.Course.Lessons))
+		}
+	}
+}
+
+func TestTextItem(t *testing.T) {
+	item := TextItem("Test Heading", "<p>Test paragraph</p>")
+	if item.Type != "text" {
+		t.Errorf("TextItem Type should be 'text', got %q", item.Type)
+	}
+	if len(item.Items) != 1 {
+		t.Fatalf("TextItem should have 1 sub-item, got %d", len(item.Items))
+	}
+	if item.Items[0].Heading != "Test Heading" {
+		t.Errorf("TextItem heading mismatch: got %q", item.Items[0].Heading)
+	}
+}
+
+func TestListItem(t *testing.T) {
+	item := ListItem("Item 1", "Item 2", "Item 3")
+	if item.Type != "list" {
+		t.Errorf("ListItem Type should be 'list', got %q", item.Type)
+	}
+	if len(item.Items) != 3 {
+		t.Errorf("ListItem should have 3 sub-items, got %d", len(item.Items))
+	}
+}
+
+func TestKnowledgeCheckItem(t *testing.T) {
+	answers := []models.Answer{
+		{Title: "A", Correct: false},
+		{Title: "B", Correct: true},
+	}
+	item := KnowledgeCheckItem("Test question?", answers)
+	if item.Type != "knowledgeCheck" {
+		t.Errorf("KnowledgeCheckItem Type should be 'knowledgeCheck', got %q", item.Type)
+	}
+	if len(item.Items) != 1 {
+		t.Fatalf("KnowledgeCheckItem should have 1 sub-item, got %d", len(item.Items))
+	}
+	if len(item.Items[0].Answers) != 2 {
+		t.Errorf("KnowledgeCheckItem should have 2 answers, got %d", len(item.Items[0].Answers))
+	}
+}
+
+func TestMediaItem(t *testing.T) {
+	tests := []struct {
+		name      string
+		mediaType string
+		hasVideo  bool
+		hasImage  bool
+	}{
+		{"video", "video", true, false},
+		{"image", "image", false, true},
+		{"unknown", "unknown", false, false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			item := MediaItem(tt.mediaType, "https://example.com/media")
+			if item.Type != "multimedia" {
+				t.Errorf("MediaItem Type should be 'multimedia', got %q", item.Type)
+			}
+			if len(item.Items) != 1 {
+				t.Fatalf("MediaItem should have 1 sub-item, got %d", len(item.Items))
+			}
+			if tt.hasVideo && item.Items[0].Media.Video == nil {
+				t.Error("Expected video media to be set")
+			}
+			if tt.hasImage && item.Items[0].Media.Image == nil {
+				t.Error("Expected image media to be set")
+			}
+		})
+	}
+}
+
+func TestInteractiveItem(t *testing.T) {
+	item := InteractiveItem("Interactive Title")
+	if item.Type != "interactive" {
+		t.Errorf("InteractiveItem Type should be 'interactive', got %q", item.Type)
+	}
+}
+
+func TestDividerItem(t *testing.T) {
+	item := DividerItem()
+	if item.Type != "divider" {
+		t.Errorf("DividerItem Type should be 'divider', got %q", item.Type)
+	}
+}
+
+func TestFlipCardItem(t *testing.T) {
+	item := FlipCardItem("Front text", "Back text")
+	if item.Type != "flashcard" {
+		t.Errorf("FlipCardItem Type should be 'flashcard', got %q", item.Type)
+	}
+	if len(item.Items) != 1 {
+		t.Fatalf("FlipCardItem should have 1 sub-item, got %d", len(item.Items))
+	}
+	if item.Items[0].Front == nil || item.Items[0].Back == nil {
+		t.Error("FlipCardItem should have Front and Back set")
+	}
+}
+
+func TestQuoteItem(t *testing.T) {
+	item := QuoteItem("Test quote", "Test author")
+	if item.Type != "quote" {
+		t.Errorf("QuoteItem Type should be 'quote', got %q", item.Type)
+	}
+}
+
+func TestImageItem(t *testing.T) {
+	item := ImageItem("https://example.com/img.jpg", "Image caption")
+	if item.Type != "image" {
+		t.Errorf("ImageItem Type should be 'image', got %q", item.Type)
+	}
+	if len(item.Items) != 1 || item.Items[0].Media == nil || item.Items[0].Media.Image == nil {
+		t.Error("ImageItem should have image media set")
+	}
+}
+
+func TestVideoItem(t *testing.T) {
+	item := VideoItem("https://example.com/video.mp4", 120, "Video caption")
+	if item.Type != "video" {
+		t.Errorf("VideoItem Type should be 'video', got %q", item.Type)
+	}
+	if len(item.Items) != 1 || item.Items[0].Media == nil || item.Items[0].Media.Video == nil {
+		t.Error("VideoItem should have video media set")
+	}
+	if item.Items[0].Media.Video.Duration != 120 {
+		t.Errorf("VideoItem duration should be 120, got %d", item.Items[0].Media.Video.Duration)
+	}
+}
+
+func TestMatchingItem(t *testing.T) {
+	pairs := map[string]string{
+		"Term 1": "Match 1",
+		"Term 2": "Match 2",
+	}
+	item := MatchingItem(pairs)
+	if item.Type != "matching" {
+		t.Errorf("MatchingItem Type should be 'matching', got %q", item.Type)
+	}
+	if len(item.Items) != 1 {
+		t.Fatalf("MatchingItem should have 1 sub-item, got %d", len(item.Items))
+	}
+	if len(item.Items[0].Answers) != 2 {
+		t.Errorf("MatchingItem should have 2 answers, got %d", len(item.Items[0].Answers))
+	}
+}
+
+func TestEmptyLesson(t *testing.T) {
+	lesson := EmptyLesson("test-id", "Test Title")
+	if lesson.ID != "test-id" {
+		t.Errorf("EmptyLesson ID mismatch: got %q", lesson.ID)
+	}
+	if lesson.Type != "lesson" {
+		t.Errorf("EmptyLesson Type should be 'lesson', got %q", lesson.Type)
+	}
+	if len(lesson.Items) != 0 {
+		t.Errorf("EmptyLesson should have no items, got %d", len(lesson.Items))
+	}
+}
+
+func TestSectionLesson(t *testing.T) {
+	lesson := SectionLesson("section-id", "Section Title")
+	if lesson.Type != "section" {
+		t.Errorf("SectionLesson Type should be 'section', got %q", lesson.Type)
+	}
+}
+
+func TestSampleVariables(t *testing.T) {
+	if len(SampleAnswers) == 0 {
+		t.Error("SampleAnswers should not be empty")
+	}
+	if len(SampleSubItems) == 0 {
+		t.Error("SampleSubItems should not be empty")
+	}
+
+	// Verify one correct answer exists in SampleAnswers
+	hasCorrect := false
+	for _, a := range SampleAnswers {
+		if a.Correct {
+			hasCorrect = true
+			break
+		}
+	}
+	if !hasCorrect {
+		t.Error("SampleAnswers should have at least one correct answer")
+	}
+}

main.go

@@ -7,11 +7,12 @@ import (
 	"context"
 	"fmt"
 	"os"
+	"os/signal"
 	"strings"
+	"syscall"
 
 	"github.com/kjanat/articulate-parser/internal/config"
 	"github.com/kjanat/articulate-parser/internal/exporters"
-	"github.com/kjanat/articulate-parser/internal/interfaces"
 	"github.com/kjanat/articulate-parser/internal/services"
 	"github.com/kjanat/articulate-parser/internal/version"
 )
@@ -26,20 +27,19 @@ func main() {
 // run contains the main application logic and returns an exit code.
 // This function is testable as it doesn't call os.Exit directly.
 func run(args []string) int {
+	// Create context that cancels on interrupt signals (SIGINT, SIGTERM)
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer cancel()
+
 	// Load configuration
 	cfg := config.Load()
 
 	// Dependency injection setup with configuration
-	var logger interfaces.Logger
-	if cfg.LogFormat == "json" {
-		logger = services.NewSlogLogger(cfg.LogLevel)
-	} else {
-		logger = services.NewTextLogger(cfg.LogLevel)
-	}
+	logger := services.NewLoggerFromConfig(cfg)
 
 	htmlCleaner := services.NewHTMLCleaner()
-	parser := services.NewArticulateParser(logger, cfg.BaseURL, cfg.RequestTimeout)
-	exporterFactory := exporters.NewFactory(htmlCleaner)
+	parser := services.NewArticulateParser(logger, cfg)
+	exporterFactory := exporters.NewFactory(htmlCleaner, logger)
 	app := services.NewApp(parser, exporterFactory)
 
 	// Check for version flag
@@ -70,9 +70,9 @@ func run(args []string) int {
 
 	// Determine if source is a URI or file path
 	if isURI(source) {
-		err = app.ProcessCourseFromURI(context.Background(), source, format, output)
+		err = app.ProcessCourseFromURI(ctx, source, format, output)
 	} else {
-		err = app.ProcessCourseFromFile(source, format, output)
+		err = app.ProcessCourseFromFile(ctx, source, format, output)
 	}
 
 	if err != nil {
@@ -92,7 +92,7 @@ func run(args []string) int {
 // Returns:
 //   - true if the string appears to be a URI, false otherwise
 func isURI(str string) bool {
-	return len(str) > 7 && (str[:7] == "http://" || str[:8] == "https://")
+	return strings.HasPrefix(str, "http://") || strings.HasPrefix(str, "https://")
 }
 
 // printUsage prints the command-line usage information.

scripts/build.sh

@@ -20,7 +20,7 @@ DEFAULT_LDFLAGS="-s -w"
 
 # Function to show help
 show_help() {
-    cat <<'EOF'
+	cat <<'EOF'
 articulate-parser Build Script (Bash)
 =====================================
 
@@ -106,129 +106,129 @@ EOF
 
 # Function to show available Go build targets
 show_targets() {
-    echo "Available Go Build Targets:"
-    echo "=========================="
-    echo
-    if command -v go >/dev/null 2>&1; then
-        echo "Getting targets from 'go tool dist list'..."
-        echo
+	echo "Available Go Build Targets:"
+	echo "=========================="
+	echo
+	if command -v go >/dev/null 2>&1; then
+		echo "Getting targets from 'go tool dist list'..."
+		echo
 
-        # Get all targets and format them nicely
-        local targets
-        targets=$(go tool dist list 2>/dev/null)
+		# Get all targets and format them nicely
+		local targets
+		targets=$(go tool dist list 2>/dev/null)
 
-        if [ $? -eq 0 ] && [ -n "$targets" ]; then
-            # Show formatted output
-            printf "%-15s %-10s %s\n" "OS" "ARCH" "STATUS"
-            printf "%-15s %-10s %s\n" "---------------" "----------" "------"
+		if [ $? -eq 0 ] && [ -n "$targets" ]; then
+			# Show formatted output
+			printf "%-15s %-10s %s\n" "OS" "ARCH" "STATUS"
+			printf "%-15s %-10s %s\n" "---------------" "----------" "------"
 
-            # Track our default targets
-            local default_targets=()
-            for os in "${OS[@]}"; do
-                for arch in "${ARCH[@]}"; do
-                    default_targets+=("$os/$arch")
-                done
-            done
+			# Track our default targets
+			local default_targets=()
+			for os in "${OS[@]}"; do
+				for arch in "${ARCH[@]}"; do
+					default_targets+=("$os/$arch")
+				done
+			done
 
-            # Display all targets with status
-            echo "$targets" | sort | while IFS='/' read -r os arch; do
-                local status="available"
-                if printf '%s\n' "${default_targets[@]}" | grep -q "^$os/$arch$"; then
-                    status="default"
-                fi
-                printf "%-15s %-10s %s\n" "$os" "$arch" "$status"
-            done
+			# Display all targets with status
+			echo "$targets" | sort | while IFS='/' read -r os arch; do
+				local status="available"
+				if printf '%s\n' "${default_targets[@]}" | grep -q "^$os/$arch$"; then
+					status="default"
+				fi
+				printf "%-15s %-10s %s\n" "$os" "$arch" "$status"
+			done
 
-            echo
-            echo "Summary:"
-            echo "  Total available targets: $(echo "$targets" | wc -l)"
-            echo "  Default targets used by this script: ${#default_targets[@]}"
-            echo
-            echo "Default script targets:"
-            for target in "${default_targets[@]}"; do
-                echo "  - $target"
-            done
-        else
-            echo "Error: Failed to get target list from 'go tool dist list'"
-            exit 1
-        fi
-    else
-        echo "Error: Go is not installed or not in PATH"
-        exit 1
-    fi
+			echo
+			echo "Summary:"
+			echo "  Total available targets: $(echo "$targets" | wc -l)"
+			echo "  Default targets used by this script: ${#default_targets[@]}"
+			echo
+			echo "Default script targets:"
+			for target in "${default_targets[@]}"; do
+				echo "  - $target"
+			done
+		else
+			echo "Error: Failed to get target list from 'go tool dist list'"
+			exit 1
+		fi
+	else
+		echo "Error: Go is not installed or not in PATH"
+		exit 1
+	fi
 }
 
 # Parse parameters
 while (("$#")); do
-    case $1 in
-    -h | --help)
-        SHOW_HELP=true
-        shift
-        ;;
-    --show-targets)
-        SHOW_TARGETS=true
-        shift
-        ;;
-    -v | --verbose)
-        VERBOSE=true
-        shift
-        ;;
-    -j)
-        if [[ ${2-} =~ ^[0-9]+$ ]]; then
-            JOBS=$2
-            shift 2
-        else
-            echo "Error: Missing number of jobs after -j"
-            exit 1
-        fi
-        ;;
-    -o)
-        if [ -n "${2-}" ]; then
-            OUTDIR=$2
-            shift 2
-        else
-            echo "Error: Missing output directory after -o"
-            exit 1
-        fi
-        ;;
-    -e)
-        if [ -n "${2-}" ]; then
-            ENTRYPOINT=$2
-            shift 2
-        else
-            echo "Error: Missing entry point file after -e"
-            exit 1
-        fi
-        ;;
-    *)
-        break
-        ;;
-    esac
+	case $1 in
+		-h | --help)
+			SHOW_HELP=true
+			shift
+			;;
+		--show-targets)
+			SHOW_TARGETS=true
+			shift
+			;;
+		-v | --verbose)
+			VERBOSE=true
+			shift
+			;;
+		-j)
+			if [[ ${2-} =~ ^[0-9]+$ ]]; then
+				JOBS=$2
+				shift 2
+			else
+				echo "Error: Missing number of jobs after -j"
+				exit 1
+			fi
+			;;
+		-o)
+			if [ -n "${2-}" ]; then
+				OUTDIR=$2
+				shift 2
+			else
+				echo "Error: Missing output directory after -o"
+				exit 1
+			fi
+			;;
+		-e)
+			if [ -n "${2-}" ]; then
+				ENTRYPOINT=$2
+				shift 2
+			else
+				echo "Error: Missing entry point file after -e"
+				exit 1
+			fi
+			;;
+		*)
+			break
+			;;
+	esac
 done
 
 # Handle help and show-targets early
 if [ "$SHOW_HELP" = true ]; then
-    show_help
-    exit 0
+	show_help
+	exit 0
 fi
 
 if [ "$SHOW_TARGETS" = true ]; then
-    show_targets
-    exit 0
+	show_targets
+	exit 0
 fi
 
 # Validate Go installation
 if ! command -v go >/dev/null 2>&1; then
-    echo "Error: Go is not installed or not in PATH"
-    echo "Please install Go from https://golang.org/dl/"
-    echo "Or if running on Windows, use the PowerShell script: scripts\\build.ps1"
-    exit 1
+	echo "Error: Go is not installed or not in PATH"
+	echo "Please install Go from https://golang.org/dl/"
+	echo "Or if running on Windows, use the PowerShell script: scripts\\build.ps1"
+	exit 1
 fi
 
 # Validate entry point exists
 if [ ! -f "$ENTRYPOINT" ]; then
-    echo "Error: Entry point file '$ENTRYPOINT' does not exist"
-    exit 1
+	echo "Error: Entry point file '$ENTRYPOINT' does not exist"
+	exit 1
 fi
 
 # Store remaining arguments as an array to preserve argument boundaries
@@ -237,30 +237,30 @@ GO_BUILD_FLAGS_ARRAY=("$@")
 # Apply default ldflags if no custom ldflags were provided
 HAS_CUSTOM_LDFLAGS=false
 for arg in "${GO_BUILD_FLAGS_ARRAY[@]}"; do
-    if [[ "$arg" == "-ldflags" ]]; then
-        HAS_CUSTOM_LDFLAGS=true
-        break
-    fi
+	if [[ "$arg" == "-ldflags" ]]; then
+		HAS_CUSTOM_LDFLAGS=true
+		break
+	fi
 done
 
 if [[ "$HAS_CUSTOM_LDFLAGS" == false ]] && [[ -n "$DEFAULT_LDFLAGS" ]]; then
-    # Add default ldflags at the beginning
-    GO_BUILD_FLAGS_ARRAY=("-ldflags" "$DEFAULT_LDFLAGS" "${GO_BUILD_FLAGS_ARRAY[@]}")
+	# Add default ldflags at the beginning
+	GO_BUILD_FLAGS_ARRAY=("-ldflags" "$DEFAULT_LDFLAGS" "${GO_BUILD_FLAGS_ARRAY[@]}")
 fi
 
 # Verbose output
 if [ "$VERBOSE" = true ]; then
-    echo "Build Configuration:"
-    echo "  Entry Point: $ENTRYPOINT"
-    echo "  Output Dir:  $OUTDIR"
-    echo "  Parallel Jobs: $JOBS"
-    if [ ${#GO_BUILD_FLAGS_ARRAY[@]} -gt 0 ]; then
-        echo "  Go Build Flags: ${GO_BUILD_FLAGS_ARRAY[*]}"
-    else
-        echo "  Go Build Flags: none"
-    fi
-    echo "  Targets: ${#OS[@]}×${#ARCH[@]} = $((${#OS[@]} * ${#ARCH[@]})) total"
-    echo
+	echo "Build Configuration:"
+	echo "  Entry Point: $ENTRYPOINT"
+	echo "  Output Dir:  $OUTDIR"
+	echo "  Parallel Jobs: $JOBS"
+	if [ ${#GO_BUILD_FLAGS_ARRAY[@]} -gt 0 ]; then
+		echo "  Go Build Flags: ${GO_BUILD_FLAGS_ARRAY[*]}"
+	else
+		echo "  Go Build Flags: none"
+	fi
+	echo "  Targets: ${#OS[@]}×${#ARCH[@]} = $((${#OS[@]} * ${#ARCH[@]})) total"
+	echo
 fi
 
 rm -rf "$OUTDIR"
@@ -272,27 +272,27 @@ BUILD_START=$(date +%s)
 # Compose all targets in an array
 TARGETS=()
 for os in "${OS[@]}"; do
-    for arch in "${ARCH[@]}"; do
-        BIN="articulate-parser-$os-$arch"
-        [[ "$os" == "windows" ]] && BIN="$BIN.exe"
-        TARGETS+=("$BIN|$os|$arch")
-    done
+	for arch in "${ARCH[@]}"; do
+		BIN="articulate-parser-$os-$arch"
+		[[ "$os" == "windows" ]] && BIN="$BIN.exe"
+		TARGETS+=("$BIN|$os|$arch")
+	done
 done
 
 # Show targets info if verbose
 if [ "$VERBOSE" = true ]; then
-    echo "Building targets:"
-    for target in "${TARGETS[@]}"; do
-        BIN="${target%%|*}"
-        echo "  - $BIN"
-    done
-    echo
+	echo "Building targets:"
+	for target in "${TARGETS[@]}"; do
+		BIN="${target%%|*}"
+		echo "  - $BIN"
+	done
+	echo
 fi
 
 # Print pending statuses and save line numbers
 for idx in "${!TARGETS[@]}"; do
-    BIN="${TARGETS[$idx]%%|*}"
-    printf "[ ] %-35s ... pending\n" "$BIN"
+	BIN="${TARGETS[$idx]%%|*}"
+	printf "[ ] %-35s ... pending\n" "$BIN"
 done
 
 # Make sure output isn't buffered
@@ -300,36 +300,36 @@ export PYTHONUNBUFFERED=1
 
 # Function to update a line in-place (1-based index)
 update_status() {
-    local idx=$1
-    local symbol=$2
-    local msg=$3
-    # Move cursor up to the correct line
-    printf "\0337"                                  # Save cursor position
-    printf "\033[%dA" $((${#TARGETS[@]} - idx + 1)) # Move up
-    printf "\r\033[K[%s] %-35s\n" "$symbol" "$msg"  # Clear & update line
-    printf "\0338"                                  # Restore cursor position
+	local idx=$1
+	local symbol=$2
+	local msg=$3
+	# Move cursor up to the correct line
+	printf "\0337"                                  # Save cursor position
+	printf "\033[%dA" $((${#TARGETS[@]} - idx + 1)) # Move up
+	printf "\r\033[K[%s] %-35s\n" "$symbol" "$msg"  # Clear & update line
+	printf "\0338"                                  # Restore cursor position
 }
 
 for idx in "${!TARGETS[@]}"; do
-    while (($(jobs -rp | wc -l) >= JOBS)); do sleep 0.2; done
-    (
-        IFS='|' read -r BIN os arch <<<"${TARGETS[$idx]}"
-        update_status $((idx + 1)) '>' "$BIN ... building"
+	while (($(jobs -rp | wc -l) >= JOBS)); do sleep 0.2; done
+	(
+		IFS='|' read -r BIN os arch <<<"${TARGETS[$idx]}"
+		update_status $((idx + 1)) '>' "$BIN ... building"
 
-        # Prepare build command as an array to properly handle arguments with spaces
-        build_cmd=(go build)
-        if [ "$VERBOSE" = true ]; then
-            build_cmd+=(-v)
-        fi
-        build_cmd+=("${GO_BUILD_FLAGS_ARRAY[@]}" -o "$OUTDIR/$BIN" "$ENTRYPOINT")
+		# Prepare build command as an array to properly handle arguments with spaces
+		build_cmd=(go build)
+		if [ "$VERBOSE" = true ]; then
+			build_cmd+=(-v)
+		fi
+		build_cmd+=("${GO_BUILD_FLAGS_ARRAY[@]}" -o "$OUTDIR/$BIN" "$ENTRYPOINT")
 
-        if CGO_ENABLED=0 GOOS="$os" GOARCH="$arch" "${build_cmd[@]}" 2>"$OUTDIR/$BIN.log"; then
-            update_status $((idx + 1)) '✔' "$BIN done"
-            rm -f "$OUTDIR/$BIN.log"
-        else
-            update_status $((idx + 1)) '✖' "$BIN FAILED (see $OUTDIR/$BIN.log)"
-        fi
-    ) &
+		if CGO_ENABLED=0 GOOS="$os" GOARCH="$arch" "${build_cmd[@]}" 2>"$OUTDIR/$BIN.log"; then
+			update_status $((idx + 1)) '✔' "$BIN done"
+			rm -f "$OUTDIR/$BIN.log"
+		else
+			update_status $((idx + 1)) '✖' "$BIN FAILED (see $OUTDIR/$BIN.log)"
+		fi
+	) &
 done
 
 wait
@@ -342,27 +342,27 @@ echo -e "\nAll builds completed in ${BUILD_DURATION}s. Find them in $OUTDIR/"
 
 # Show build summary if verbose
 if [ "$VERBOSE" = true ]; then
-    echo
-    echo "Build Summary:"
-    echo "=============="
-    success_count=0
-    total_size=0
+	echo
+	echo "Build Summary:"
+	echo "=============="
+	success_count=0
+	total_size=0
 
-    for target in "${TARGETS[@]}"; do
-        BIN="${target%%|*}"
-        if [ -f "$OUTDIR/$BIN" ]; then
-            success_count=$((success_count + 1))
-            size=$(stat -f%z "$OUTDIR/$BIN" 2>/dev/null || stat -c%s "$OUTDIR/$BIN" 2>/dev/null || echo "0")
-            total_size=$((total_size + size))
-            rm -f "$OUTDIR/$BIN.log"
-            printf "  ✔ %-42s %s\n" "$OUTDIR/$BIN" "$(numfmt --to=iec-i --suffix=B $size 2>/dev/null || echo "${size} bytes")"
-        else
-            printf "  ✖ %-42s %s\n" "$OUTDIR/$BIN" "FAILED"
-        fi
-    done
+	for target in "${TARGETS[@]}"; do
+		BIN="${target%%|*}"
+		if [ -f "$OUTDIR/$BIN" ]; then
+			success_count=$((success_count + 1))
+			size=$(stat -f%z "$OUTDIR/$BIN" 2>/dev/null || stat -c%s "$OUTDIR/$BIN" 2>/dev/null || echo "0")
+			total_size=$((total_size + size))
+			rm -f "$OUTDIR/$BIN.log"
+			printf "  ✔ %-42s %s\n" "$OUTDIR/$BIN" "$(numfmt --to=iec-i --suffix=B $size 2>/dev/null || echo "${size} bytes")"
+		else
+			printf "  ✖ %-42s %s\n" "$OUTDIR/$BIN" "FAILED"
+		fi
+	done
 
-    echo "  ────────────────────────────────────────────────"
-    printf "  Total: %d/%d successful, %s total size\n" "$success_count" "${#TARGETS[@]}" "$(numfmt --to=iec-i --suffix=B $total_size 2>/dev/null || echo "${total_size} bytes")"
+	echo "  ────────────────────────────────────────────────"
+	printf "  Total: %d/%d successful, %s total size\n" "$success_count" "${#TARGETS[@]}" "$(numfmt --to=iec-i --suffix=B $total_size 2>/dev/null || echo "${total_size} bytes")"
 fi
 
 # Clean up environment variables to avoid contaminating future builds

tombi.toml

@@ -0,0 +1,49 @@
+# :schema tombi://www.schemastore.org/tombi.json
+# :tombi toml-version = "v1.1.0"
+
+toml-version = "v1.1.0"
+
+[files]
+include = ["**/*.toml", "**/.*.toml"]
+exclude = ["**/fixtures"]
+
+[format]
+[format.rules]
+array-bracket-space-width         = 0
+array-comma-space-width           = 1
+date-time-delimiter               = "T"
+indent-style                      = "space"
+indent-sub-tables                 = false
+indent-table-key-value-pairs      = false
+indent-width                      = 2
+inline-table-brace-space-width    = 1
+inline-table-comma-space-width    = 1
+key-value-equals-sign-alignment   = true
+key-value-equals-sign-space-width = 1
+line-ending                       = "lf"
+line-width                        = 140
+string-quote-style                = "double"
+trailing-comment-alignment        = true
+trailing-comment-space-width      = 2
+
+[lint]
+[lint.rules]
+dotted-keys-out-of-order = "warn"
+key-empty                = "warn"
+tables-out-of-order      = "error"
+
+[lsp]
+code-action.enabled          = true
+completion.enabled           = true
+diagnostic.enabled           = true
+document-link.enabled        = true
+formatting.enabled           = true
+goto-declaration.enabled     = true
+goto-definition.enabled      = true
+goto-type-definition.enabled = true
+hover.enabled                = true
+workspace-diagnostic.enabled = true
+
+[schema]
+enabled = true
+strict  = true