github-release.yml

name: Create GitHub Release

on:
  push:
    tags:
      - "v*"

jobs:
  release:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Extract release notes from changelog
        env:
          TAG_NAME: ${{ github.ref_name }}
        run: |
          set -euo pipefail

          version="${TAG_NAME#v}"
          start_pattern="^## ${version}( - .*)?$"

          if ! awk -v start="$start_pattern" '
            BEGIN { in_section = 0; found = 0 }
            $0 ~ start { in_section = 1; found = 1; next }
            /^## / && in_section { exit }
            in_section { print }
            END {
              if (!found) {
                exit 1
              }
            }
          ' CHANGELOG.md > RELEASE_NOTES.raw.md; then
            echo "No changelog section found for version ${version}."
            exit 1
          fi

          sed -e '/./,$!d' RELEASE_NOTES.raw.md > RELEASE_NOTES.md

          if [ ! -s RELEASE_NOTES.md ]; then
            echo "Changelog section for version ${version} is empty."
            exit 1
          fi

      - name: Create release
        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ github.ref_name }}
          name: ${{ github.ref_name }}
          body_path: RELEASE_NOTES.md