automatic-changelog.yml

name: Automatic changelog entry
on:
  pull_request_target:
    branches:
      - dev-2.x
    types: [closed]

jobs:
  changelog-entry:
    if: github.event.pull_request.merged && github.repository_owner == 'opentripplanner'
    runs-on: ubuntu-latest
    steps:

      - name: Checkout
        uses: actions/checkout@v2
        with:
          token: ${{ secrets.CHANGELOG_TOKEN }}

      - name: Configure Git User
        run: |
          git config --global user.name 'OTP Changelog Bot'
          git config --global user.email 'changelog-bot@opentripplanner.org'

      - name: Generate changelog entry from PR information
        run: |
          # if the title contains "changelog skip" we don't generate an entry
          TITLE_LOWER_CASE=`echo $TITLE | awk '{print tolower($0)}'`
          if  [[ "${TITLE_LOWER_CASE}" =~ "changelog skip" ]]; then
            echo "Skipping changelog entry generation"
          else
            # add a line above the one which contains AUTOMATIC_CHANGELOG_PLACEHOLDER
            ITEM="${TITLE} [#${NUMBER}](${URL})"
            TEMP_FILE=docs/Changelog.generated.md
            FILE=docs/Changelog.md
            awk "/CHANGELOG_PLACEHOLDER/{print \"- $ITEM\"}1" $FILE > $TEMP_FILE
            mv $TEMP_FILE $FILE
            git add $FILE
            git commit -m "Add changelog entry for #${NUMBER} [ci skip]"
            git push ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git HEAD:dev-2.x
          fi
        env:
          # Use environment variables to prevent injection attack
          TITLE: ${{ github.event.pull_request.title }}
          NUMBER: ${{ github.event.pull_request.number }}
          URL: ${{ github.event.pull_request.html_url }}