PowerShell · daxian-dbw · Feb 13, 2026 · Oct 30, 2025 · Copilot · Feb 13, 2026
@@ -0,0 +1,122 @@
+# Get Changed Files Action
+
+A reusable composite action that retrieves the list of files changed in a pull request or push event.
+
+## Features
+
+- Supports both `pull_request` and `push` events
+- Optional filtering by file pattern
+- Returns files as JSON array for easy consumption
+- Filters out deleted files (only returns added, modified, or renamed files)
+- Handles up to 100 changed files per request
- Handles up to 100 changed files per request
+- Supports pagination for pull requests (no file limit) and respects GitHub API limits for push events (up to 100 files per request)
- Handles up to 100 changed files per request
+- Supports pagination for pull requests (no file limit) and respects GitHub API limits for push events (up to 100 files per request)
+
+## Usage
+
+### Basic Usage (Pull Requests Only)
+
+```yaml
+- name: Get changed files
+  id: changed-files
+  uses: "./.github/actions/infrastructure/get-changed-files"
+
+- name: Process files
+  run: |
+    echo "Changed files: ${{ steps.changed-files.outputs.files }}"
+    echo "Count: ${{ steps.changed-files.outputs.count }}"
+```
+
+### With Filtering
+
+```yaml
+# Get only markdown files
+- name: Get changed markdown files
+  id: changed-md
+  uses: "./.github/actions/infrastructure/get-changed-files"
+  with:
+    filter: '*.md'
+
+# Get only GitHub workflow/action files
+- name: Get changed GitHub files
+  id: changed-github
+  uses: "./.github/actions/infrastructure/get-changed-files"
+  with:
+    filter: '.github/'
+```
+
+### Support Both PR and Push Events
+
+```yaml
+- name: Get changed files
+  id: changed-files
+  uses: "./.github/actions/infrastructure/get-changed-files"
+  with:
+    event-types: 'pull_request,push'
+```
+
+## Inputs
+
+| Name | Description | Required | Default |
+|------|-------------|----------|---------|
+| `filter` | Optional filter pattern (e.g., `*.md` for markdown files, `.github/` for GitHub files) | No | `''` |
+| `event-types` | Comma-separated list of event types to support (`pull_request`, `push`) | No | `pull_request` |
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| `files` | JSON array of changed file paths |
+| `count` | Number of changed files |
+
+## Filter Patterns
+
+The action supports simple filter patterns:
+
+- **Extension matching**: Use `*.ext` to match files with a specific extension
+  - Example: `*.md` matches all markdown files
+  - Example: `*.yml` matches all YAML files
+
+- **Path prefix matching**: Use a path prefix to match files in a directory
+  - Example: `.github/` matches all files in the `.github` directory
+  - Example: `tools/` matches all files in the `tools` directory
+
+## Example: Processing Changed Files
+
+```yaml
+- name: Get changed files
+  id: changed-files
+  uses: "./.github/actions/infrastructure/get-changed-files"
+
+- name: Process each file
+  shell: pwsh
+  env:
+    CHANGED_FILES: ${{ steps.changed-files.outputs.files }}
+  run: |
+    $changedFilesJson = $env:CHANGED_FILES
+    $changedFiles = $changedFilesJson | ConvertFrom-Json
+
+    foreach ($file in $changedFiles) {
+      Write-Host "Processing: $file"
+      # Your processing logic here
+    }
+```
+
+## Limitations
+
+- Simple filter patterns only (no complex glob or regex patterns)
+
+## Pagination
+
+The action automatically handles pagination to fetch **all** changed files in a PR, regardless of how many files were changed:
+
+- Fetches files in batches of 100 per page
+- Continues fetching until all files are retrieved
+- Logs a note when pagination occurs, showing the total file count
+- **No file limit** - all changed files will be processed, even in very large PRs
+
+This ensures that critical workflows (such as merge conflict checking, link validation, etc.) don't miss files due to pagination limits.
+
+## Related Actions
+
+- **markdownlinks**: Uses this pattern to get changed markdown files
+- **merge-conflict-checker**: Uses this pattern to get changed files for conflict detection
+- **path-filters**: Similar functionality but with more complex filtering logic
@@ -0,0 +1,117 @@
+name: 'Get Changed Files'
+description: 'Gets the list of files changed in a pull request or push event'
+inputs:
+  filter:
+    description: 'Optional filter pattern (e.g., "*.md" for markdown files, ".github/" for GitHub files)'
+    required: false
+    default: ''
+  event-types:
+    description: 'Comma-separated list of event types to support (pull_request, push)'
+    required: false
+    default: 'pull_request'
+outputs:
+  files:
+    description: 'JSON array of changed file paths'
+    value: ${{ steps.get-files.outputs.files }}
+  count:
+    description: 'Number of changed files'
+    value: ${{ steps.get-files.outputs.count }}
+runs:
+  using: 'composite'
+  steps:
+    - name: Get changed files
+      id: get-files
+      uses: actions/github-script@v7
-      uses: actions/github-script@v7
+      uses: actions/github-script@v7.0.1
-      uses: actions/github-script@v7
+      uses: actions/github-script@v7.0.1
+      with:
+        script: |
+          const eventTypes = '${{ inputs.event-types }}'.split(',').map(t => t.trim());
+          const filter = '${{ inputs.filter }}';
+          let changedFiles = [];
+
+          if (eventTypes.includes('pull_request') && context.eventName === 'pull_request') {
+            console.log(`Getting files changed in PR #${context.payload.pull_request.number}`);
+
+            // Fetch all files changed in the PR with pagination
+            let allFiles = [];
+            let page = 1;
+            let fetchedCount;
+
+            do {
+              const { data: files } = await github.rest.pulls.listFiles({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                pull_number: context.payload.pull_request.number,
+                per_page: 100,
+                page: page
+              });
+
+              allFiles = allFiles.concat(files);
+              fetchedCount = files.length;
+              page++;
+            } while (fetchedCount === 100);
+
+            if (allFiles.length >= 100) {
+              console.log(`Note: This PR has ${allFiles.length} changed files. All files fetched using pagination.`);
+            }
+
+            changedFiles = allFiles
+              .filter(file => file.status === 'added' || file.status === 'modified' || file.status === 'renamed')
+              .map(file => file.filename);
+
+          } else if (eventTypes.includes('push') && context.eventName === 'push') {
+            console.log(`Getting files changed in push to ${context.ref}`);
+
+            const { data: comparison } = await github.rest.repos.compareCommits({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              base: context.payload.before,
+              head: context.payload.after,
+            });
+
+            changedFiles = comparison.files
+              .filter(file => file.status === 'added' || file.status === 'modified' || file.status === 'renamed')
+              .map(file => file.filename);
+
+          } else {
+            core.setFailed(`Unsupported event type: ${context.eventName}. Supported types: ${eventTypes.join(', ')}`);
+            return;
+          }
+
+          // Apply filter if provided
+          if (filter) {
+            const filterLower = filter.toLowerCase();
+            const beforeFilter = changedFiles.length;
+            changedFiles = changedFiles.filter(file => {
+              const fileLower = file.toLowerCase();
+              // Support simple patterns like "*.md" or ".github/"
+              if (filterLower.startsWith('*.')) {
+                const ext = filterLower.substring(1);
+                return fileLower.endsWith(ext);
+              } else {
+                return fileLower.startsWith(filterLower);
+              }
+            });
+            console.log(`Filter '${filter}' applied: ${beforeFilter} → ${changedFiles.length} files`);
+          }
+
+          // Calculate simple hash for verification
+          const crypto = require('crypto');
+          const filesJson = JSON.stringify(changedFiles.sort());
+          const hash = crypto.createHash('sha256').update(filesJson).digest('hex').substring(0, 8);
+
+          // Log changed files in a collapsible group
+          core.startGroup(`Changed Files (${changedFiles.length} total, hash: ${hash})`);
+          if (changedFiles.length > 0) {
+            changedFiles.forEach(file => console.log(`  - ${file}`));
+          } else {
+            console.log('  (no files changed)');
+          }
+          core.endGroup();
+
+          console.log(`Found ${changedFiles.length} changed files`);
+          core.setOutput('files', JSON.stringify(changedFiles));
+          core.setOutput('count', changedFiles.length);
+
+branding:
+  icon: 'file-text'
+  color: 'blue'
@@ -31,52 +31,23 @@ runs:
   steps:
     - name: Get changed markdown files
       id: changed-files
-      uses: actions/github-script@v7
+      uses: "./.github/actions/infrastructure/get-changed-files"
       with:
-        script: |
-          let changedMarkdownFiles = [];
-
-          if (context.eventName === 'pull_request') {
-            const { data: files } = await github.rest.pulls.listFiles({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              pull_number: context.payload.pull_request.number,
-            });
-
-            changedMarkdownFiles = files
-              .filter(file => file.filename.endsWith('.md'))
-              .map(file => file.filename);
-          } else if (context.eventName === 'push') {
-            const { data: comparison } = await github.rest.repos.compareCommits({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              base: context.payload.before,
-              head: context.payload.after,
-            });
-
-            changedMarkdownFiles = comparison.files
-              .filter(file => file.filename.endsWith('.md'))
-              .map(file => file.filename);
-          } else {
-            core.setFailed(`Unsupported event type: ${context.eventName}. This action only supports 'pull_request' and 'push' events.`);
-            return;
-          }
-
-          console.log('Changed markdown files:', changedMarkdownFiles);
-          core.setOutput('files', JSON.stringify(changedMarkdownFiles));
-          core.setOutput('count', changedMarkdownFiles.length);
-          return changedMarkdownFiles;
+        filter: '*.md'
+        event-types: 'pull_request,push'
 
     - name: Verify markdown links
       id: verify
       shell: pwsh
+      env:
+        CHANGED_FILES_JSON: ${{ steps.changed-files.outputs.files }}
       run: |
         Write-Host "Starting markdown link verification..." -ForegroundColor Cyan
 
-        # Get changed markdown files from previous step
-        $changedFilesJson = '${{ steps.changed-files.outputs.files }}'
+        # Get changed markdown files from environment variable (secure against injection)
+        $changedFilesJson = $env:CHANGED_FILES_JSON
         $changedFiles = $changedFilesJson | ConvertFrom-Json
-        
+
         if ($changedFiles.Count -eq 0) {
           Write-Host "No markdown files changed, skipping verification" -ForegroundColor Yellow
           "total=0" >> $env:GITHUB_OUTPUT
@@ -85,7 +56,7 @@ runs:
           "skipped=0" >> $env:GITHUB_OUTPUT
           exit 0
         }
-        
+
         Write-Host "Changed markdown files: $($changedFiles.Count)" -ForegroundColor Cyan
         $changedFiles | ForEach-Object { Write-Host "  - $_" -ForegroundColor Gray }