Updated to solves the regex explosion issue

Author: eshanrnh

.github/workflows/check-pr-links.yml

@@ -17,18 +17,38 @@ jobs:
         with:
           fetch-depth: 0
 
-      # Step 2: Check out base branch and dump all links (no fragments)
+      # Step 2: Check out base branch
       - name: Check out base branch
         run: git checkout ${{ github.event.pull_request.base.ref }}
 
-      - name: Dump all links from base branch (no fragments)
+      # Step 3: Get changed Markdown files
+      - name: Get changed Markdown files
+        id: changed-files
+        run: |
+          mapfile -t files_array < <(git diff --name-only origin/${{ github.event.pull_request.base.ref }} ${{ github.head_ref }} | grep '\.md$' || true)
+          files=""
+          for f in "${files_array[@]}"; do
+            files="$files \"$f\""
+          done
+          echo "changed_files=$files" >> $GITHUB_ENV
+          echo "Changed Markdown files: $files"
+
+      # Step 4: Skip workflow if no Markdown files changed
+      - name: Skip if no Markdown files changed
+        if: ${{ env.changed_files == '' }}
+        run: |
+          echo "No Markdown files changed in this PR. Skipping link check."
+          exit 0
+
+      # Step 5: Dump base branch links for changed files only (no fragments)
+      - name: Dump base branch links
         uses: lycheeverse/lychee-action@v2
         with:
-          args: "--dump ."
+          args: "--dump ${{ env.changed_files }}"
           output: ./existing-links.txt
         continue-on-error: true
 
-      # Step 3: Stash untracked files and switch back to feature branch
+      # Step 6: Stash untracked files and switch back to feature branch
       - name: Stash untracked files
         run: git stash push --include-untracked
 
@@ -38,29 +58,22 @@ jobs:
       - name: Apply stashed changes
         run: git stash pop || true
 
-      # Step 4: Add base branch links to .lycheeignore
+      # Step 7: Add base branch links to .lycheeignore
       - name: Update ignore file
         run: |
           if [ -f "existing-links.txt" ]; then
             cat existing-links.txt >> .lycheeignore
           fi
 
-      # Step 5: Get changed Markdown files in the PR
-      - name: Get changed Markdown files
-        id: changed-files
-        run: |
-          files=$(git diff --name-only origin/${{ github.event.pull_request.base.ref }} ${{ github.head_ref }} | grep '\.md$' || true)
-          files=$(echo "$files" | tr '\n' ' ')
-          echo "changed_files=$files" >> $GITHUB_ENV
-
-      # Step 6: Run Lychee on changed files only (with fragments)
+      # Step 8: Run Lychee on changed files one by one
       - name: Run Lychee link checker
-        if: ${{ env.changed_files != '' }}
-        uses: lycheeverse/lychee-action@v2
-        with:
-          args: "--no-progress --include-fragments ${{ env.changed_files }}"
+        run: |
+          for f in ${{ env.changed_files }}; do
+            echo "Checking links in $f"
+            lychee --no-progress --include-fragments "$f"
+          done
 
-      # Step 7: Provide a helpful failure message
+      # Step 9: Provide a helpful failure message
       - name: Helpful failure message
         if: ${{ failure() }}
         run: |