release.yml

name: Create Release
on:
  push:
    tags:
      - "v*"
jobs:
  branch_exists:
    runs-on: ubuntu-20.04
    outputs:
      branch_exists: ${{ steps.check_branch.outputs.branch_exists }}
    steps:
      - uses: actions/checkout@v2
      - name: Check if release already exists
        id: check_branch
        env:
          REF: ${{ github.ref }}
        run: |
          echo "branch_exists=$(git ls-remote --heads origin refs/heads/release/${REF:10} | wc -l)" >> $GITHUB_OUTPUT

  release:
    runs-on: ubuntu-20.04
    needs: branch_exists
    if: ${{ needs.branch_exists.outputs.branch_exists == 0 }}
    steps:
      - uses: actions/checkout@v2

      - name: Bump version if needed
        continue-on-error: true
        env:
          REF: ${{ github.ref }}
        run: |
          git config --local user.email "action@github.com"
          git config --local user.name "GitHub Action"

          git checkout -b ${REF:10}-update
          git tag -d ${REF:10}
          git push -d origin ${REF:10}

          sed -i "s/version = \".*\"/version = \"${REF:11}\"/" pyproject.toml
          git add pyproject.toml
          git commit -m "bump version for release"

          git tag -a ${REF:10} -m "${REF:10}"
          git push -u origin HEAD:main ${REF:10}

      - name: Create release branch and bump version
        env:
          REF: ${{ github.ref }}
        run: |
          BRANCH=release/${REF:10}
          git checkout -b $BRANCH
          git push -u origin $BRANCH

      - name: Extract Changelog
        id: extract_changelog
        env:
          REF: ${{ github.ref }}
        run: |
          sed -n "/^## ${REF:10}/,/^## /{/^## /b;p}" docs/changelog.md | sed -r '1d;$d' > ./RELEASE_CHANGELOG
          echo ::set-output name=version_name::`sed -nr "s/^## (${REF:10}.*)$/\1/p" docs/changelog.md`

      - name: Create Release
        id: create_release
        uses: actions/create-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          tag_name: ${{ github.ref }}
          release_name: ${{ steps.extract_changelog.outputs.version_name }}
          body_path: ./RELEASE_CHANGELOG
          draft: true