release.yml

name: Release

on:
  workflow_dispatch:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]

jobs:

  parse-changelog:
    runs-on: ubuntu-latest
    outputs:
      should_tag:  ${{ steps.check_version.outputs.should_tag }}
      version:     ${{ steps.check_version.outputs.version }}
      description: ${{ steps.check_version.outputs.description }}
    steps:
      - uses: actions/checkout@v4
        with: { fetch-depth: 0 }
      - name: Extract Version and Description from CHANGELOG.md
        id: check_version
        run: |
          set -euo pipefail
          # Extract version and description
          VERSION=$(sed -n 's/^## \[\(.*\)\] - .*/\1/p' CHANGELOG.md | head -n 1)
          [ -z "$VERSION" ] && { echo "No version found in CHANGELOG.md"; exit 1; }
          DESCRIPTION=$(awk '/^## \['"$VERSION"'\]/ {flag=1; next} /^## \[/ {flag=0} flag {print}' CHANGELOG.md)
          # Escape newlines in the description, otherwise actions will freak out
          DESCRIPTION_ESCAPED=$(echo "$DESCRIPTION" | sed ':a;N;$!ba;s/\n/\\n/g')

          echo "VERSION: $VERSION"
          echo "DESCRIPTION: $DESCRIPTION_ESCAPED"

          # Check if the version is already tagged
          if git tag -l "$VERSION" | grep -q "$VERSION"; then
            echo "Version $VERSION is already tagged."
            echo "should_tag=false" >> $GITHUB_OUTPUT
          else
            echo "should_tag=true" >> $GITHUB_OUTPUT
            echo "version=$VERSION" >> $GITHUB_OUTPUT
            echo "description=$DESCRIPTION_ESCAPED" >> $GITHUB_OUTPUT
          fi

  test-and-tag:
    needs: parse-changelog
    if: needs.parse-changelog.outputs.should_tag == 'true'   # skip if the tag already exists
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4
        with: { fetch-depth: 0 }

      - uses: actions/setup-go@v4
        with: { go-version-file: 'go.mod' }

      - name: Run unit tests
        run: go test -race ./...

      - name: Create and push tag
        env:
          VERSION:      ${{ needs.parse-changelog.outputs.version }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          git config user.name  "github-actions[bot]"
          git config user.email "actions@github.com"
          git tag -a "${VERSION}" -m "${DESCRIPTION}"
          git push origin "${VERSION}"