trim-old-branches.yml

name: Trim Old Branches

on:
  push:
    branches:
      - trim**
  repository_dispatch:
    types:
      - all
      - trim
  schedule:
    - cron: "0 0 * * *" # every day at midnight

jobs:
  trim_branches:
    runs-on: ubuntu-latest

    name: Trim Old Branches

    steps:
      - uses: actions/checkout@v3
        name: GitHub Pull

      # https://github.com/actions/checkout/pull/112/files#diff-04c6e90faac2675aa89e2176d2eec7d8R194-R200
      - name: Fetch all branches
        run: |
          git fetch --no-tags --prune --depth=1 origin +refs/heads/*:refs/remotes/origin/*

      - name: Trim Branches
        shell: bash
        # delete branches starting with `gha-`
        # do not delete the most recent 5 branches
        # delete all branches whose latest commit is older than a week.
        run: |
          git config --local --unset http.https://github.com/.extraheader
          git config --local --list
          echo ""
          echo "All Branches:"
          git branch -r --sort=-committerdate
          echo ""
          echo "Branches older than most recent 5 branches"
          git branch -r --sort=-committerdate | awk -F/ '/\/gha-/{print $2}' | tail -n+6
          echo ""
          for k in $(git branch -r --sort=-committerdate | awk -F/ '/\/gha-/{print $2}' | tail -n+6); do
            echo "Branch: $k"
            if [ -z "$(git log -1 --since='1 week ago' -s origin/$k)" ]; then
              echo "-- Deleting branch: $k"
              git push https://${{ github.actor }}:${{ secrets.GITHUB_TOKEN }}@github.com/rstudio/shinycoreci.git --delete $k
            fi
          done