post-merge.yml

name: Post-merge
on:
  pull_request_target:
    branches:
      - dev-2.x
    types: [closed]

# to avoid conflicts, make sure that only one workflow pushes to Github at the same time
concurrency:
  group: github-push

jobs:
  changelog-entry:
    if: github.event.pull_request.merged && github.repository_owner == 'opentripplanner' && !contains(github.event.pull_request.labels.*.name, 'skip changelog')
    runs-on: ubuntu-latest
    steps:

      - name: Checkout
        uses: actions/checkout@v4
        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: |
          # 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 pull --rebase origin dev-2.x
          git push ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git HEAD:dev-2.x
        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 }}

  serialization-version:
    # if you have a dependent job that is skipped (ie. you want to bump the version but not have a changelog entry) you must add
    # always() before your actual condition you want for the job
    #   https://github.com/actions/runner/issues/491#issuecomment-660122693
    if: always() && github.event.pull_request.merged && github.repository_owner == 'opentripplanner' && contains(github.event.pull_request.labels.*.name, 'bump serialization id')
    runs-on: ubuntu-latest
    needs: [changelog-entry]
    steps:

      - name: Install xmllint
        run: |
          sudo apt-get update
          sudo apt-get install -y libxml2-utils

      - name: Configure git user
        run: |
          git config --global user.name 'OTP Serialization Version Bot'
          git config --global user.email 'serialization-version-bot@opentripplanner.org'

      - name: Checkout
        uses: actions/checkout@v4
        with:
          token: ${{ secrets.CHANGELOG_TOKEN }}

      - name: Bump serialization version
        run: |
          version=`xmllint --xpath "//*[local-name()='otp.serialization.version.id']/text()" pom.xml`
          bumped=$((version+1))
          sed -Ei "s/<otp\.serialization\.version\.id>.*<\/otp\.serialization\.version\.id>/<otp\.serialization\.version\.id>${bumped}<\/otp\.serialization\.version\.id>/" pom.xml 
 
          git add pom.xml
          git commit -m "Bump serialization version id for #${NUMBER}"
          # just for safety as the Github repo is eventually consistent, therefore this push competes with the changelog entry one
          git pull --rebase origin dev-2.x
          git push ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git HEAD:dev-2.x
        env:
          # Use environment variables to prevent injection attack
          NUMBER: ${{ github.event.pull_request.number }}