release.yml

# Automatically create a GitHub Release when a version tag is pushed.
# Extracts the changelog section for the tagged version from CHANGES.md.

name: Create Release

on:
  push:
    tags:
      - 'v*'

permissions:
  contents: write

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

      - name: Extract version from tag
        id: version
        run: |
          TAG="${GITHUB_REF#refs/tags/}"
          VERSION="${TAG#v}"
          echo "tag=$TAG" >> "$GITHUB_OUTPUT"
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
          echo "Releasing: $TAG (version $VERSION)"

      - name: Extract changelog for this version
        id: changelog
        run: |
          VERSION="${{ steps.version.outputs.version }}"

          # Extract the section between ## [VERSION] and the next ## [
          BODY=$(awk -v ver="$VERSION" '
            /^## \[/ {
              if (found) exit
              if (index($0, "[" ver "]")) { found=1; next }
            }
            found { print }
          ' CHANGES.md)

          if [ -z "$BODY" ]; then
            BODY="Release ${{ steps.version.outputs.tag }}"
            echo "Warning: No changelog entry found for version $VERSION"
          fi

          # Write to file to preserve newlines
          echo "$BODY" > /tmp/release-body.md
          echo "body_file=/tmp/release-body.md" >> "$GITHUB_OUTPUT"

      - name: Create GitHub Release
        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ steps.version.outputs.tag }}
          name: ${{ steps.version.outputs.tag }}
          body_path: ${{ steps.changelog.outputs.body_file }}
          draft: false
          prerelease: false