release.yml

name: Release Drafter and Publisher

on:
  pull_request:
    types:
      - closed

concurrency:
  group: ${{ github.workflow }}-${{ github.ref_protected == 'true' && github.sha || github.ref }}-{{ github.event_name }}
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  new_release:
    if: github.ref == 'refs/heads/master' && github.event.pull_request.merged == true
    permissions:
      # write permission is required to create a github release
      contents: write
      # write permission is required for autolabeler
      # otherwise, read permission is required at least
      pull-requests: write
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Get branch name
        id: getbranch
        run: echo ::set-output name=BRANCH::${GITHUB_HEAD_REF}

      # ${{ github.ref }} was not giving v* as tag name, but refs/tags/v* instead, so It had to be abbreviated
      - name: Get latest abbreviated tag
        id: gettag
        run: echo ::set-output name=TAG::$(git describe --tags $(git rev-list --tags --max-count=1)) # get the latest tag across all branches and put it in the output TAG

      - name: Calculate next version
        id: nextversion
        run: |
          BRANCH_NAME="${{ steps.getbranch.outputs.BRANCH }}"
          CURRENT_VERSION="${{ steps.gettag.outputs.TAG }}"
          CURRENT_VERSION="${CURRENT_VERSION#v}"  # Remove the 'v' from the start of the version
          IFS='.' read -ra VERSION_PARTS <<< "$CURRENT_VERSION"
          if [[ $BRANCH_NAME =~ ^major/ ]]; then
            VERSION_PARTS[0]=$((VERSION_PARTS[0] + 1))
            VERSION_PARTS[1]=0
            VERSION_PARTS[2]=0
          elif [[ $BRANCH_NAME =~ ^minor/ ]]; then
            VERSION_PARTS[1]=$((VERSION_PARTS[1] + 1))
            VERSION_PARTS[2]=0
          else
            VERSION_PARTS[2]=$((VERSION_PARTS[2] + 1))
          fi
          NEXT_VERSION="v${VERSION_PARTS[0]}.${VERSION_PARTS[1]}.${VERSION_PARTS[2]}"
          echo ::set-output name=NEXT_VERSION::"$NEXT_VERSION"

      - name: Update CHANGELOG.md
        run: |
          EXISTING_CHANGELOG=$(cat CHANGELOG.md)
          echo "     " > CHANGELOG.md
          echo "## ${{ steps.nextversion.outputs.NEXT_VERSION }}" >> CHANGELOG.md
          echo "- ${{ github.event.pull_request.title }} (#${{ github.event.pull_request.number }}) @${{ github.event.pull_request.user.login }}" >> CHANGELOG.md
          echo "     " >> CHANGELOG.md
          echo -e "$EXISTING_CHANGELOG" >> CHANGELOG.md

      - name: Commit changes
        run: |
          git config --local user.email "action@github.com"
          git config --local user.name "GitHub Action"
          git add CHANGELOG.md
          git commit -m "Update CHANGELOG.md for PR #${{ github.event.pull_request.number }}"

      - name: Push changes
        run: git push origin HEAD:master

      - name: Create and publish new tag
        run: |
          git tag ${{ steps.nextversion.outputs.NEXT_VERSION }}
          git push origin ${{ steps.nextversion.outputs.NEXT_VERSION }}

      - uses: release-drafter/release-drafter@v5
        with:
          commitish: master
          name: "stellar-etl ${{ steps.nextversion.outputs.NEXT_VERSION }}"
          tag: ${{ steps.nextversion.outputs.NEXT_VERSION }}
          publish: true
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}