release.yml

name: release

on:
  push:
    tags:
      - "v*"
  workflow_dispatch:
    inputs:
      tag:
        description: "Existing tag to release, for example v1.4.0"
        required: true
        type: string

permissions:
  contents: write

jobs:
  github-release:
    runs-on: ubuntu-latest
    env:
      RELEASE_TAG: ${{ github.event_name == 'workflow_dispatch' && inputs.tag || github.ref_name }}
    steps:
      - name: Checkout repo
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Extract release notes
        run: |
          TAG="${RELEASE_TAG}"
          git rev-parse "$TAG" >/dev/null
          awk -v tag="$TAG" '
            index($0, "## [" tag "]") == 1 { found = 1; next }
            found && /^## \[/ { exit }
            found { print }
          ' changelog.md > release_notes.md

          if [ ! -s release_notes.md ]; then
            echo "Release $TAG" > release_notes.md
          fi

      - name: Create or update GitHub release
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          TAG="${RELEASE_TAG}"
          if gh release view "$TAG" >/dev/null 2>&1; then
            gh release edit "$TAG" --title "$TAG" --notes-file release_notes.md
          else
            gh release create "$TAG" --title "$TAG" --notes-file release_notes.md
          fi