ci.yml

name: ci

on:
  push:
    branches: [main]
  pull_request:

permissions:
  contents: read

jobs:
  test:
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest]
    runs-on: ${{ matrix.os }}
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
      - name: git version
        run: git --version
      - name: gofmt
        run: test -z "$(gofmt -l .)" || (gofmt -l . && exit 1)
      - name: vet
        run: go vet ./...
      - name: staticcheck
        uses: dominikh/staticcheck-action@v1
        with:
          install-go: false
      - name: test
        run: go test -race ./...
      - name: build
        run: go build -o /dev/null ./cmd/gitident

  # Publishes the coverage badge data (shields.io endpoint JSON) to the
  # `badges` branch; README.md renders it. No third-party service involved.
  coverage:
    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
    needs: test
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
      - name: measure
        run: |
          go test -coverpkg=./... -coverprofile=coverage.out ./...
          pct=$(go tool cover -func=coverage.out | awk '/^total:/ { sub("%", "", $3); print $3 }')
          color=$(awk -v p="$pct" 'BEGIN { print (p >= 90 ? "brightgreen" : p >= 80 ? "green" : p >= 70 ? "yellowgreen" : p >= 50 ? "yellow" : "red") }')
          printf '{"schemaVersion":1,"label":"coverage","message":"%s%%","color":"%s"}\n' "$pct" "$color" > "$RUNNER_TEMP/coverage.json"
          echo "Coverage: ${pct}%" >> "$GITHUB_STEP_SUMMARY"
      - name: publish
        run: |
          dir="$RUNNER_TEMP/badges"
          if git fetch --depth=1 origin badges; then
            git worktree add -B badges "$dir" FETCH_HEAD
          else
            git worktree add --orphan -b badges "$dir"
          fi
          cp "$RUNNER_TEMP/coverage.json" "$dir/coverage.json"
          cd "$dir"
          git add coverage.json
          if git diff --cached --quiet; then exit 0; fi
          git -c user.name="github-actions[bot]" -c user.email="41898282+github-actions[bot]@users.noreply.github.com" \
            commit -q -m "Update coverage badge"
          git push -q origin badges