release.yml

name: Release on merge

on:
  pull_request:
    types: [closed]
    branches: [main]

permissions:
  contents: write

jobs:
  release:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest
    env:
      MODULE_PATH: ${{ github.repository }}
    steps:
      - name: Check out code into the Go module directory
        uses: actions/checkout@v5
        with:
          fetch-depth: 0

      - name: Setup Go 1.24
        uses: actions/setup-go@v6
        with:
          go-version: "1.24"
      - name: Decide bump from PR labels (default=patch)
        id: decide
        run: |
            echo '${{ toJson(github.event.pull_request.labels) }}' > /tmp/labels.json
            BUMP=patch
            grep -qi 'release:major' /tmp/labels.json && BUMP=major
            grep -qi 'release:minor' /tmp/labels.json && BUMP=minor
            grep -qi 'release:patch' /tmp/labels.json && BUMP=patch
            echo "bump=$BUMP" >> $GITHUB_OUTPUT
            echo "BUMP=$BUMP"


      - name: Run tests (race + coverage)
        run: |
            make fmt
            make vet
            make test-race-cover
            go tool cover -func=coverage.out | tail -n1 || true

      - name: Compute next semver tag
        id: bump
        shell: bash
        run: |
            set -euo pipefail
            LAST_TAG="$(git describe --tags --abbrev=0 2>/dev/null || echo 'v0.1.0')"
            echo "LAST_TAG=$LAST_TAG"
            VER="${LAST_TAG#v}"
            IFS='.' read -r MA MI PA <<< "$VER"
            case "${{ steps.decide.outputs.bump }}" in
              major) MA=$((MA+1)); MI=0; PA=0;;
              minor) MI=$((MI+1)); PA=0;;
              patch) PA=$((PA+1));;
            esac
            NEXT_TAG="v${MA}.${MI}.${PA}"
            echo "next_tag=$NEXT_TAG" >> $GITHUB_OUTPUT
            echo "NEXT_TAG=$NEXT_TAG"

      - name: Create GitHub Release
        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ steps.bump.outputs.next_tag }}
          generate_release_notes: true
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Prime Go proxy (make the tag discoverable)
        run: |
                MOD="github.com/${{ github.repository }}"
                TAG="${{ steps.bump.outputs.next_tag }}"
                GOPROXY=proxy.golang.org go list -m -versions "$MOD" || true
                GOPROXY=proxy.golang.org go list -m "$MOD@$TAG" || true