add orphaned diff finder

.github/workflows/orphaned.yaml

@@ -0,0 +1,68 @@
+name: "PR Orphaned Diff Finder"
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  orphaned-diff:
+    runs-on: ubuntu-latest
+
+    permissions:
+      pull-requests: write
+
+    steps:
+      - name: Checkout the PR
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Generate Final PR Diff
+        id: final_diff
+        run: |
+          git diff ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }} > final_diff.patch
+          echo "Final diff generated."
+
+      - name: Identify Orphaned Changes
+        id: orphaned_changes
+        run: |
+            echo "## Orphaned Changes" > orphaned_changes.md
+
+            # Fetch the base and head refs
+            git fetch origin ${{ github.event.pull_request.base.ref }}:${{ github.event.pull_request.base.ref }}
+            git fetch origin ${{ github.event.pull_request.head.ref }}:${{ github.event.pull_request.head.ref }}
+
+            git diff ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }} > final_diff.patch
+            echo "## Orphaned Changes" > orphaned_changes.md
+
+            commits=$(git log ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }} --pretty=format:"%H" --reverse)
+
+            any_orphaned=false
+
+            for commit in $commits; do
+                echo "Checking commit $commit..."
+                git diff ${commit}^ $commit > commit_diff.patch || true
+
+                # Compare commit diff with final diff
+                ORPHANED=$(diff --unchanged-line-format='' --old-line-format='%L' --new-line-format='' commit_diff.patch final_diff.patch || true)
+
+                if [[ ! -z "$ORPHANED" ]]; then
+                    echo "### Commit $commit" >> orphaned_changes.md
+                    echo '```diff' >> orphaned_changes.md
+                    echo "$ORPHANED" >> orphaned_changes.md
+                    echo '```' >> orphaned_changes.md
+                    echo "" >> orphaned_changes.md
+                    any_orphaned=true
+                fi
+            done
+
+            if [[ "$any_orphaned" = false ]]; then
+                echo "No orphaned changes found."
+                echo "No orphaned changes found." > orphaned_changes.md
+            fi
+
+      - name: Comment on PR with Orphaned Changes
+        uses: marocchino/sticky-pull-request-comment@v2
+        with:
+          header: orphaned-diff
+          path: orphaned_changes.md