Create magefile from Makefile

This commit makes a magefile.go that should be functionally equivalent to
the current Makefile.

magefile.go

@@ -0,0 +1,230 @@
+// +build mage
+
+package main
+
+import (
+	"bytes"
+	"errors"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/magefile/mage/mg"
+	"github.com/magefile/mage/sh"
+)
+
+const (
+	packageName  = "github.com/gohugoio/hugo"
+	noGitLdflags = "-X $PACKAGE/hugolib.BuildDate=$BUILD_DATE"
+)
+
+var ldflags = "-X $PACKAGE/hugolib.CommitHash=$COMMIT_HASH -X $PACKAGE/hugolib.BuildDate=$BUILD_DATE"
+
+// allow user to override go executable by running as GOEXE=xxx make ... on unix-like systems
+var goexe = "go"
+
+func init() {
+	if exe := os.Getenv("GOEXE"); exe != "" {
+		goexe = exe
+	}
+}
+
+func govendor() error {
+	return sh.Run(goexe, "get", "github.com/kardianos/govendor")
+}
+
+// Install govendor and sync Hugo's vendored dependencies
+func Vendor() error {
+	mg.Deps(govendor)
+	return sh.Run("govendor", "sync", packageName)
+}
+
+// Build hugo binary
+func Hugo() error {
+	mg.Deps(Vendor)
+	return sh.RunWith(flagEnv(), goexe, "build", "-ldflags", ldflags, packageName)
+}
+
+// Build hugo binary with race detector enabled
+func HugoRace() error {
+	mg.Deps(Vendor)
+	return sh.RunWith(flagEnv(), goexe, "build", "-race", "-ldflags", ldflags, packageName)
+}
+
+// Install hugo binary
+func Install() error {
+	mg.Deps(Vendor)
+	return sh.RunWith(flagEnv(), goexe, "install", "-ldflags", ldflags, packageName)
+}
+
+func flagEnv() map[string]string {
+	hash, _ := sh.Output("git", "rev-parse", "--short", "HEAD")
+	return map[string]string{
+		"PACKAGE":     packageName,
+		"COMMIT_HASH": hash,
+		"BUILD_DATE":  time.Now().Format("2006-01-02T15:04:05Z0700"),
+	}
+}
+
+// Build hugo without git info
+func HugoNoGitInfo() {
+	ldflags = noGitLdflags
+	mg.Deps(Vendor, Hugo)
+}
+
+var docker = sh.RunCmd("docker")
+
+// Build hugo Docker container
+func Docker() error {
+	if err := docker("build", "-t", "hugo", "."); err != nil {
+		return err
+	}
+	// yes ignore errors here
+	docker("rm", "-f", "hugo-build")
+	if err := docker("run", "--name", "hugo-build", "hugo ls /go/bin"); err != nil {
+		return err
+	}
+	if err := docker("cp", "hugo-build:/go/bin/hugo", "."); err != nil {
+		return err
+	}
+	return docker("rm", "hugo-build")
+}
+
+// Run tests and linters
+func Check() {
+	mg.Deps(TestRace, Test386, Fmt, Vet)
+}
+
+// Run tests in 32-bit mode
+func Test386() error {
+	return sh.RunWith(map[string]string{"GOARCH": "386"}, "govendor", "test", "+local")
+}
+
+// Run tests
+func Test() error {
+	mg.Deps(govendor)
+	return sh.Run("govendor", "test", "+local")
+}
+
+// Run tests with race detector
+func TestRace() error {
+	mg.Deps(govendor)
+	return sh.Run("govendor", "test", "-race", "+local")
+}
+
+// Run gofmt linter
+func Fmt() error {
+	pkgs, err := hugoPackages()
+	if err != nil {
+		return err
+	}
+	failed := false
+	for _, pkg := range pkgs {
+		files, err := filepath.Glob(filepath.Join(pkg, "*.go"))
+		if err != nil {
+			return nil
+		}
+		for _, f := range files {
+			if err := sh.Run("gofmt", "-l", f); err != nil {
+				failed = false
+			}
+		}
+	}
+	if failed {
+		return errors.New("improperly formatted go files")
+	}
+	return nil
+}
+
+var pkgPrefixLen = len("github.com/gohugoio/hugo")
+
+func hugoPackages() ([]string, error) {
+	mg.Deps(govendor)
+	s, err := sh.Output("govendor", "list", "-no-status", "+local")
+	if err != nil {
+		return nil, err
+	}
+	pkgs := strings.Split(s, "\n")
+	for i := range pkgs {
+		pkgs[i] = "." + pkgs[i][pkgPrefixLen:]
+	}
+	return pkgs, nil
+}
+
+// Run golint linter
+func Lint() error {
+	pkgs, err := hugoPackages()
+	if err != nil {
+		return err
+	}
+	failed := false
+	for _, pkg := range pkgs {
+		if _, err := sh.Exec(nil, os.Stderr, os.Stderr, "golint", "-set_exit_status", pkg); err != nil {
+			failed = true
+		}
+	}
+	if failed {
+		return errors.New("golint errors!")
+	}
+	return nil
+}
+
+//  Run go vet linter
+func Vet() error {
+	mg.Deps(govendor)
+	if err := sh.Run("govendor", "vet", "+local"); err != nil {
+		return errors.New("go vet errors!")
+	}
+	return nil
+}
+
+// Generate test coverage report
+func TestCoverHTML() error {
+	mg.Deps(govendor)
+	const (
+		coverAll = "coverage-all.out"
+		cover    = "coverage.out"
+	)
+	f, err := os.Create(coverAll)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	if _, err := f.Write([]byte("mode: count")); err != nil {
+		return err
+	}
+	pkgs, err := hugoPackages()
+	if err != nil {
+		return err
+	}
+	for _, pkg := range pkgs {
+		if err := sh.Run("govendor", "test", "-coverprofile="+cover, "-covermode=count", pkg); err != nil {
+			return err
+		}
+		b, err := ioutil.ReadFile(cover)
+		if err != nil {
+			return err
+		}
+		idx := bytes.Index(b, []byte{'\n'})
+		b = b[idx+1:]
+		if _, err := f.Write(b); err != nil {
+			return err
+		}
+	}
+	if err := f.Close(); err != nil {
+		return err
+	}
+	return sh.Run(goexe, "tool", "cover", "-html="+coverAll)
+}
+
+// Verify that vendored packages match git HEAD
+func CheckVendor() error {
+	if err := sh.Run("git", "diff-index", "--quiet", "HEAD", "vendor/"); err != nil {
+		// yes, ignore errors from this, not much we can do.
+		sh.Exec(nil, os.Stdout, os.Stderr, "git", "diff", "vendor/")
+		return errors.New("check-vendor target failed: vendored packages out of sync")
+	}
+	return nil
+}