winnow/.github/workflows/release.yml

name: Release

on:
  push:
    tags:
      - "v*"
  workflow_dispatch:
    inputs:
      version:
        description: "Version to release (e.g. 0.1.0)"
        required: true
        default: "0.1.0"

permissions:
  contents: write

jobs:
  release:
    name: Create GitHub Release
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Resolve tag name
        id: tag
        run: |
          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            echo "TAG=v${{ github.event.inputs.version }}" >> "$GITHUB_OUTPUT"
            echo "VERSION=${{ github.event.inputs.version }}" >> "$GITHUB_OUTPUT"
          else
            TAG="${GITHUB_REF_NAME}"
            echo "TAG=${TAG}" >> "$GITHUB_OUTPUT"
            echo "VERSION=${TAG#v}" >> "$GITHUB_OUTPUT"
          fi

      - name: Create and push tag (workflow_dispatch only)
        if: github.event_name == 'workflow_dispatch'
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          TAG="${{ steps.tag.outputs.TAG }}"
          if git rev-parse "$TAG" >/dev/null 2>&1; then
            echo "Tag $TAG already exists, skipping creation."
          else
            git tag "$TAG"
            git push origin "$TAG"
          fi

      - name: Extract changelog for this version
        id: changelog
        run: |
          VERSION="${{ steps.tag.outputs.VERSION }}"
          # Extract the section for this version from CHANGELOG.md
          NOTES=$(awk "/^## \[$VERSION\]/{found=1; next} found && /^## \[/{exit} found{print}" CHANGELOG.md)
          # Use a delimiter to safely pass multiline output
          {
            echo "NOTES<<CHANGELOG_EOF"
            echo "$NOTES"
            echo "CHANGELOG_EOF"
          } >> "$GITHUB_OUTPUT"

      - name: Create GitHub Release
        uses: actions/github-script@v7
        env:
          RELEASE_TAG: ${{ steps.tag.outputs.TAG }}
          RELEASE_NOTES: ${{ steps.changelog.outputs.NOTES }}
        with:
          script: |
            const tag = process.env.RELEASE_TAG;
            const notes = (process.env.RELEASE_NOTES || '').trim();
            await github.rest.repos.createRelease({
              owner: context.repo.owner,
              repo: context.repo.repo,
              tag_name: tag,
              name: `Release ${tag}`,
              body: notes || `Release ${tag}`,
              draft: false,
              prerelease: false,
            });