cleanup-branches.yaml

name: cleanup-merged-branches

on:
  schedule:
    # Every week on Monday morning at 00:00
    - cron: '0 0 * * 1'
  workflow_dispatch:
    inputs:
      dryRun:
        description: "Dry Run"
        required: false
        default: true
        type: choice
        options:
        - false
        - true

jobs:
  cleanup:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          # With fetch-depth 0 the checkout action will also fetch all tags and branches.
          fetch-depth: 0
          token: ${{ secrets.GH_PAT }}

      - name: Configure git name/email
        run: |
          git config user.name "IBM/Instana/Team Node.js"
          git config user.email github-actions@github.com          

      - name: Authenticate GitHub CLI
        run: |
          gh auth login --with-token <<< "${{ secrets.GH_PAT }}"

      - name: Delete old merged branches
        env:
          DRY_RUN: ${{ github.event.inputs.dryRun }}
          GITHUB_TOKEN: ${{ secrets.GH_PAT }}
        run: |
          if [[ "$(uname)" == "Darwin" ]]; then
            THRESHOLD_DATE=$(date -v-60d +%s)
          else
            THRESHOLD_DATE=$(date +%s -d '60 days ago')
          fi

          git fetch --prune --all

          for branch in $(git branch -r | grep -E 'origin/(chore-|docs-|fix-|feat-|test-|refactor-)'); do
            branch_name=$(echo "$branch" | sed 's|origin/||')

            pr_info=$(gh pr list --state merged --base main --head "$branch_name" --json mergedAt)
            pr_merged_at=$(echo "$pr_info" | jq -r '.[0].mergedAt' 2>/dev/null)

            if [[ -z "$pr_merged_at" || "$pr_merged_at" == "null" ]]; then
                echo "Branch $branch_name has no merged PR. Skipping."
                continue
            fi

            pr_merged_at_cleaned=$(echo "$pr_merged_at" | sed 's/Z$//')
            pr_merged_timestamp=$(date -d "$pr_merged_at_cleaned" +%s 2>/dev/null || date -j -f "%Y-%m-%dT%H:%M:%S" "$pr_merged_at_cleaned" +%s)

            if [[ $pr_merged_timestamp -lt $THRESHOLD_DATE ]]; then
              if [[ "$DRY_RUN" == "true" ]]; then
                echo "Dry run: git push origin --delete $branch_name"
              else
                echo "Deleting branch: $branch_name"
                git push origin --delete "$branch_name"
              fi
            else
              echo "Skipping branch: $branch_name (merged less than 60 days ago)."
            fi
          done