release.yml

name: Release

on:
  push:
    branches: [main]

concurrency: ${{ github.workflow }}-${{ github.ref }}

jobs:
  release:
    name: Release
    runs-on: ubuntu-latest
    # The repo's default workflow token is read-only, so without this the job 403s
    # when pushing the tag / creating the release (releases had to be made by hand).
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check for version change
        id: version_check
        run: |
          # Get current version from package.json
          CURRENT_VERSION=$(node -p "require('./package.json').version")
          echo "current_version=$CURRENT_VERSION" >> $GITHUB_OUTPUT

          # Get previous version from the parent commit
          PREVIOUS_VERSION=$(git show HEAD^:package.json 2>/dev/null | node -p "JSON.parse(require('fs').readFileSync('/dev/stdin', 'utf8')).version" 2>/dev/null || echo "")

          echo "Current version: $CURRENT_VERSION"
          echo "Previous version: $PREVIOUS_VERSION"

          # Check if tag already exists
          if git rev-parse "v$CURRENT_VERSION" >/dev/null 2>&1; then
            echo "Tag v$CURRENT_VERSION already exists"
            echo "should_release=false" >> $GITHUB_OUTPUT
          elif [ "$CURRENT_VERSION" != "$PREVIOUS_VERSION" ] && [ -n "$PREVIOUS_VERSION" ]; then
            echo "Version changed from $PREVIOUS_VERSION to $CURRENT_VERSION, will create release"
            echo "should_release=true" >> $GITHUB_OUTPUT
          else
            echo "No version change detected"
            echo "should_release=false" >> $GITHUB_OUTPUT
          fi

      # Create and push tag
      - name: Create and push tag
        if: steps.version_check.outputs.should_release == 'true'
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git tag "v${{ steps.version_check.outputs.current_version }}"
          git push origin "v${{ steps.version_check.outputs.current_version }}"

      # Extract release notes from CHANGELOG.md for this version
      - name: Extract release notes
        if: steps.version_check.outputs.should_release == 'true'
        id: release_notes
        run: |
          VERSION="${{ steps.version_check.outputs.current_version }}"
          # Print the body between this version's header and the next version header,
          # excluding both headers. Handles both "## 1.2.3" and "## [1.2.3]" styles.
          # (The old awk range failed because its end pattern also matched the start
          # header, collapsing the range to a single line — release notes were empty.)
          NOTES=$(awk -v ver="$VERSION" '
            $0 ~ "^## \\[?" ver "([^0-9]|$)" { collecting = 1; next }
            collecting && /^## \[?[0-9]/ { exit }
            collecting { print }
          ' CHANGELOG.md)
          # Use a delimiter for multiline output
          echo "notes<<EOF" >> $GITHUB_OUTPUT
          echo "$NOTES" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT

      # Create GitHub Release
      - name: Create GitHub Release
        if: steps.version_check.outputs.should_release == 'true'
        uses: softprops/action-gh-release@v1
        with:
          tag_name: v${{ steps.version_check.outputs.current_version }}
          name: v${{ steps.version_check.outputs.current_version }}
          body: ${{ steps.release_notes.outputs.notes }}
          generate_release_notes: false
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}