release.yml

name: Release

on:
  push:
    tags:
      - 'v*'

permissions:
  contents: write

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

      - name: Extract changelog section
        run: |
          set -euo pipefail
          TAG="${GITHUB_REF_NAME}"
          VERSION="${TAG#v}"

          if [ ! -f CHANGELOG.md ]; then
            echo "CHANGELOG.md not found at repo root" >&2
            exit 1
          fi

          awk -v ver="$VERSION" '
            $0 ~ "^## \\[" ver "\\]" { found=1; next }
            found && /^## \[/ { exit }
            found && /^# Notes/ { exit }
            found { print }
          ' CHANGELOG.md > release_notes.md

          if ! grep -q '[^[:space:]]' release_notes.md; then
            echo "No CHANGELOG.md section found for version ${VERSION}" >&2
            echo "Expected a heading like: ## [${VERSION}] - YYYY-MM-DD" >&2
            exit 1
          fi

          echo "----- release notes for ${TAG} -----"
          cat release_notes.md
          echo "------------------------------------"

      - name: Create GitHub Release
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          set -euo pipefail
          PRERELEASE_FLAG=""
          case "${GITHUB_REF_NAME}" in
            *-*) PRERELEASE_FLAG="--prerelease" ;;
          esac
          gh release create "${GITHUB_REF_NAME}" \
            --title "${GITHUB_REF_NAME}" \
            --notes-file release_notes.md \
            ${PRERELEASE_FLAG}