release-on-version-change.yml

name: release-on-version-change

# Creates a GitHub Release automatically whenever the package version in
# awslambdaric/__init__.py changes on main. The release notes are taken from
# the matching section of RELEASE.CHANGELOG.md.
on:
  push:
    branches: [ main ]
    paths:
      - 'awslambdaric/__init__.py'

permissions:
  contents: write

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

      - name: Read version
        id: version
        run: |
          VERSION="$(sed -n 's/^__version__[[:space:]]*=[[:space:]]*"\([^"]*\)".*/\1/p' awslambdaric/__init__.py)"
          if [ -z "$VERSION" ]; then
            echo "Could not determine version from awslambdaric/__init__.py" >&2
            exit 1
          fi
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
          echo "Detected version: $VERSION"

      - name: Extract changelog notes
        env:
          VERSION: ${{ steps.version.outputs.version }}
        run: |
          # Write notes to a file (never interpolated into the shell) so that
          # special characters in the changelog (backticks, parentheses, etc.)
          # are passed verbatim to gh via --notes-file.
          awk -v ver="$VERSION" '
            index($0, "`" ver "`") == 1 { capture = 1; next }
            capture && /^### / { exit }
            capture { print }
          ' RELEASE.CHANGELOG.md > release-notes.md
          # Trim leading blank lines.
          sed -i -e '/./,$!d' release-notes.md
          if [ ! -s release-notes.md ]; then
            echo "No changelog entry found for $VERSION in RELEASE.CHANGELOG.md." >&2
            echo "Add a '\`$VERSION\`' section before bumping the version." >&2
            exit 1
          fi
          echo "----- release notes -----"
          cat release-notes.md

      - name: Create GitHub Release
        env:
          GH_TOKEN: ${{ github.token }}
          VERSION: ${{ steps.version.outputs.version }}
        run: |
          gh release create "$VERSION" \
            --target "$GITHUB_SHA" \
            --title "AWS Lambda Runtime Interface Client for Python v$VERSION" \
            --notes-file release-notes.md \
            --latest