pruneBranchesByPatterns.yaml

name: Prune Branches by Patterns

on:
  # Trigger the workflow every Monday at 23:00 UTC
  # Monday to Tuesday at 00:00 ETC
  schedule:
    - cron: '0 22 * * 1'

jobs:
  delete_merged_branches:
    runs-on: ubuntu-latest
    steps:
      - name: Authorize Mikroe Actions App
        uses: actions/create-github-app-token@v1
        id: app-token
        with:
          app-id: ${{ vars.MIKROE_ACTIONS }}
          private-key: ${{ secrets.MIKROE_ACTIONS_KEY_AUTHORIZE }}

      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0  # Ensure the full history is fetched to check merged branches.

      - name: Add GitHub Actions credentials
        run: |
          git config user.name github-actions
          git config user.email github-actions@github.com

      - name: List and delete merged feature branches
        id: run_script
        run: |
          # set -x ## Use for debug
          # Define the path to the patterns file and log file
          pattern_file=".github/workflows/branch_patterns/delete_patterns.txt"
          deleted_branches_file="deleted_branches.txt"

          # Ensure the file exists
          if [ ! -f "$pattern_file" ]; then
            echo "Pattern file $pattern_file not found!"
            exit 1
          fi

          # Initialize the log file
          echo "Deleted branches on $(date):" > "$deleted_branches_file"

          # Read patterns from the file, sanitize for CRLF endings, and iterate over each pattern
          deleted_count=0  # Counter to track deleted branches
          while IFS= read -r pattern || [[ -n "$pattern" ]]; do
            # Remove any \r (CR) characters from the pattern (handles CRLF line endings)
            pattern=$(echo "$pattern" | tr -d '\r')
            echo "Checking pattern: origin/${pattern}"

            # Find branches that match the pattern
            branches_to_delete=($(git branch -r --merged | grep "origin/${pattern}" | grep -v 'main' | grep -v 'master' | sed 's/origin\///'))

            # Check if any branches were found for the pattern
            if [ ${#branches_to_delete[@]} -eq 0 ]; then
              echo "No branches to delete for pattern: $pattern"
            else
              # Delete each branch found for the pattern
              for branch in "${branches_to_delete[@]}"; do
                echo "Deleting branch $branch"
                git push origin --delete "$branch"
                echo "$branch" >> "$deleted_branches_file"  # Log deleted branches
                deleted_count=$((deleted_count+1))  # Increment the deleted branches counter
              done
            fi
          done < "$pattern_file"

          echo "deleted_count=$deleted_count" >> $GITHUB_OUTPUT

      # Upload the artifact (deleted_branches.txt file)
      - name: Upload deleted branches log as artifact
        if: steps.run_script.outputs.deleted_count != '0'  # Only upload if there were deletions
        uses: actions/upload-artifact@v4
        with:
          name: deleted-branches-log
          path: deleted_branches.txt