changelog.yml

on:
  pull_request:
    branches:
      - dev
    types: [closed]

jobs:
  update_changelog:
    name: Update and Commit Changelog
    runs-on: ubuntu-latest
    if: github.event.pull_request.merged == true && startsWith( github.event.pull_request.title, '[' )
    steps:
      # Checkout git.
      - uses: actions/checkout@v2
        with:
          ref: dev # checkout dev branch.
          fetch-depth: 0 # fetch all history.

      - run: git config --global user.email "iconibot@jckemp.com"
      - run: git config --global user.name "Iconibot"

      - name: Create Changelog Entry String
        run: |
          import json
          import os
          with open('${{ github.event_path }}') as fh:
              event = json.load(fh)
          escaped = event['pull_request']['title']
          with open(os.environ['GITHUB_ENV'], 'a') as fh:
              print(f'PR_TITLE={escaped}', file=fh)
        shell: python3 {0}

      # Update changelog.
      - run: |
          printf "%b" "$PR_TITLE  \n" >> changelog-dev.md

      # Commit changes.
      - run: git add changelog-dev.md
      - run: git commit -m "Update Changelog" || echo "No changes to commit"
      - run: git push origin dev