Check Broken links in Markdown files that are changed in the current PR

Author: Vamshi-Microsoft

.github/workflows/lychee-links.yml

@@ -1,25 +1,35 @@
-name: Check for Broken Links
+name: Check Broken links in PR
 
 on:
   pull_request:
-  workflow_dispatch:
 
 jobs:
   lychee:
-    name: Broken Link Checker
     runs-on: ubuntu-latest
+
     steps:
-      - name: Checkout code
+      - name: Checkout PR code
         uses: actions/checkout@v4
 
-      - name: Run Lychee link checker
+      - name: Get changed Markdown files
+        id: changed-files
+        run: |
+          echo "Fetching changed markdown files..."
+          files=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep '\.md$' || true)
+          echo "Changed Markdown files: $files"
+          echo "md_files<<EOF" >> $GITHUB_OUTPUT
+          echo "$files" >> $GITHUB_OUTPUT
+          echo "EOF" >> $GITHUB_OUTPUT
+
+      - name: Run Lychee only on internal links in changed .md files
+        if: steps.changed-files.outputs.md_files != ''
         uses: lycheeverse/[email protected]
         with:
           args: >
             --verbose
             --exclude-mail
             --no-progress
             --exclude ^https?://
-            '**/*.md'
+            ${{ steps.changed-files.outputs.md_files }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}