gh_release.yml

# This workflow will load Python, run a script to generate assets, and then
# bundle a github release

name: Release generator

on:
  pull_request:
    types:
      - closed

jobs:
  create_release:
    if: github.event.pull_request.merged && contains( github.event.pull_request.labels.*.name, 'release')
    runs-on: ubuntu-latest
    steps:
      - name: Manual workaround for Github not having a runtime macro to check for the default branch
        id: gatekeeper
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          DEFAULT_BRANCH=$(curl -H "Authorization: token $GITHUB_TOKEN" -s https://api.github.com/repos/$GITHUB_REPOSITORY | jq -rc .default_branch)
          unset IS_DEFAULT_BRANCH
          if [ "$GITHUB_BASE_REF" == "$DEFAULT_BRANCH" ]; then IS_DEFAULT_BRANCH='true'; fi
          echo "::set-output name=IS_DEFAULT_BRANCH::$IS_DEFAULT_BRANCH"
      - uses: actions/checkout@v2
        if: steps.gatekeeper.outputs.IS_DEFAULT_BRANCH

      - uses: actions/setup-python@v2
        if: steps.gatekeeper.outputs.IS_DEFAULT_BRANCH
        with:
          python-version: 3.8

      - name: Create tag from title and run asset script
        if: steps.gatekeeper.outputs.IS_DEFAULT_BRANCH
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        id: find_tag_and_prepare_assets
        run: |
          TAG=$(echo ${{ github.event.pull_request.title }} | sed -E "s/^.*Release (.+\..+\..+)$/\1/g")
          echo "::set-output name=tag::$TAG"
          
          SCRIPT=.github/prepare_assets.sh
          if [ -f $SCRIPT ]; then 
            chmod u+x $SCRIPT
            $SCRIPT $TAG
          fi
      - name: Create Release
        if: steps.gatekeeper.outputs.IS_DEFAULT_BRANCH
        id: create_release
        uses: actions/create-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          tag_name: ${{ steps.find_tag_and_prepare_assets.outputs.tag }}
          release_name: ${{ github.event.pull_request.title }}
          body: ${{ github.event.pull_request.body }}
          draft: false
          prerelease: false

      - name: Add latest-release tag
        if: steps.gatekeeper.outputs.IS_DEFAULT_BRANCH
        run: |
          git tag -f latest-release
          git push -f --tags
      - name: Upload Assets
        if: steps.gatekeeper.outputs.IS_DEFAULT_BRANCH
        run: |
          upload_url=${{ steps.create_release.outputs.upload_url }}
          if [ -f .github/release_assets.txt ]; then
            while IFS="" read -r FILE || [ -n "$FILE" ]
            do
              curl -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
                -H "Content-Type: $(file -b --mime-type $FILE)" \
                --data-binary "@$FILE" \
                "${upload_url%\{*}?name=$(basename $FILE)"
            done < .github/release_assets.txt
          fi