ci: only run splitter for starters with changes

.github/workflows/release-package-splitter.yml

@@ -17,43 +17,119 @@ env:
   GITHUB_TOKEN: ${{ secrets.ACCESS_TOKEN }}
 
 jobs:
+  determine_changed:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+      has_changes: ${{ steps.set-matrix.outputs.has_changes }}
+
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+
+      - id: changed
+        # Only run change detection for push events
+        if: ${{ github.event_name == 'push' }}
+        uses: tj-actions/changed-files@v44
+        with:
+          files: |
+            starters/academic-cv/**
+            starters/resume/**
+            starters/blog/**
+            starters/documentation/**
+            starters/link-in-bio/**
+            starters/landing-page/**
+          dir_names: true
+          dir_names_max_depth: 2
+          dir_names_exclude_current_dir: true
+
+      # Build dynamic matrix
+      - name: Build dynamic matrix
+        id: set-matrix
+        env:
+          CHANGED_DIRS: ${{ steps.changed.outputs.dir_names || '' }}
+        run: |
+          # Define the full mapping
+          declare -A STARTER_MAP=(
+            ["starters/academic-cv"]="theme-academic-cv"
+            ["starters/resume"]="theme-resume"
+            ["starters/blog"]="theme-blog"
+            ["starters/documentation"]="theme-documentation"
+            ["starters/link-in-bio"]="theme-link-in-bio"
+            ["starters/landing-page"]="theme-landing-page"
+          )
+
+          # For non-push events, always use full matrix
+          if [ "${{ github.event_name }}" != "push" ]; then
+            echo "Using full matrix for ${{ github.event_name }} event"
+            echo "matrix=[{\"local_path\":\"starters/academic-cv\",\"split_repository\":\"theme-academic-cv\"},{\"local_path\":\"starters/resume\",\"split_repository\":\"theme-resume\"},{\"local_path\":\"starters/blog\",\"split_repository\":\"theme-blog\"},{\"local_path\":\"starters/documentation\",\"split_repository\":\"theme-documentation\"},{\"local_path\":\"starters/link-in-bio\",\"split_repository\":\"theme-link-in-bio\"},{\"local_path\":\"starters/landing-page\",\"split_repository\":\"theme-landing-page\"}]" >> "$GITHUB_OUTPUT"
+            echo "has_changes=true" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+
+          echo "Detected starter directories: $CHANGED_DIRS"
+
+          # If no changes, set empty matrix
+          if [ -z "$CHANGED_DIRS" ]; then
+            echo "No starters changed"
+            echo "matrix=[]" >> "$GITHUB_OUTPUT"
+            echo "has_changes=false" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+
+          # Build JSON array for changed starters
+          JSON="["
+          FIRST=true
+          # tj-actions outputs space-separated list
+          for DIR in $CHANGED_DIRS; do
+            # Only process if it's a known starter
+            if [[ -n "${STARTER_MAP[$DIR]}" ]]; then
+              if [ "$FIRST" = true ]; then
+                FIRST=false
+              else
+                JSON+=","
+              fi
+              JSON+="{\"local_path\":\"$DIR\",\"split_repository\":\"${STARTER_MAP[$DIR]}\"}"
+            fi
+          done
+          JSON+="]"
+
+          # Check if we actually added any starters
+          if [ "$JSON" = "[]" ]; then
+            echo "No valid starters found in changed directories"
+            echo "matrix=[]" >> "$GITHUB_OUTPUT"
+            echo "has_changes=false" >> "$GITHUB_OUTPUT"
+          else
+            echo "matrix=$JSON" >> "$GITHUB_OUTPUT"
+            echo "has_changes=true" >> "$GITHUB_OUTPUT"
+          fi
+
   packages_split:
-    # Run normally for push/workflow_dispatch; for workflow_run only run on success
-    if: ${{ github.event_name != 'workflow_run' || github.event.workflow_run.conclusion == 'success' }}
+    needs: determine_changed
+    # Run when:
+    #  • Event is not workflow_run OR upstream workflow succeeded.
+    #  • Event is not push OR at least one starter changed.
+    if: ${{ (github.event_name != 'workflow_run' || github.event.workflow_run.conclusion == 'success') && needs.determine_changed.outputs.has_changes == 'true' }}
+
     runs-on: ubuntu-latest
 
     strategy:
       fail-fast: false
       matrix:
-        # define package to repository map
-        package:
-          - local_path: "starters/academic-cv"
-            split_repository: "theme-academic-cv"
-          - local_path: "starters/resume"
-            split_repository: "theme-resume"
-          - local_path: "starters/blog"
-            split_repository: "theme-blog"
-          - local_path: "starters/documentation"
-            split_repository: "theme-documentation"
-          - local_path: "starters/link-in-bio"
-            split_repository: "theme-link-in-bio"
-          - local_path: "starters/landing-page"
-            split_repository: "theme-landing-page"
+        package: ${{ fromJson(needs.determine_changed.outputs.matrix) }}
 
     steps:
       - uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
 
       # step if no tag is pushed
       - if: ${{ !startsWith(github.ref, 'refs/tags/') }}
         uses: "symplify/monorepo-split-github-action@v2.3.0"
         with:
-          # ↓ split "packages/<package-name><package-name>" directory
           package_directory: "${{ matrix.package.local_path }}"
-
-          # ↓ into https://github.com/HugoBlox/<package-name> repository
           repository_organization: "HugoBlox"
           repository_name: "${{ matrix.package.split_repository }}"
-
-          # ↓ the user signed under the split commit
           user_name: "Splitter Bot"
           user_email: "no.reply@hugoblox.com"