Function main

dev/update_closure_compiler.go:42–139

()

var rgxVersion = regexp.MustCompile(`.*Version: (.*) \(revision.*`)

func main() {

	// check JRE presence
	_, err := exec.LookPath("java")
	if err != nil {
		log.Fatal("Didn't find 'java' in $PATH. The Java Runtime Environment is needed to run the closure compiler.\n")
	}

	srcRoot, err := osutil.PkSourceRoot()
	if err != nil {
		log.Fatalf("source root folder not found: %v", err)
	}
	destDir := filepath.Join(srcRoot, "tmp", "closure-compiler")
	// check if compiler already exists
	jarFile := filepath.Join(destDir, "compiler.jar")
	_, err = os.Stat(jarFile)
	if err == nil {
		// if compiler exists, check version
		cmd := exec.Command("java", "-jar", jarFile, "--version", "--help", "2>&1")
		output, _ := cmd.CombinedOutput()
		m := rgxVersion.FindStringSubmatch(string(output))
		if m == nil {
			log.Fatalf("Could not find compiler version in %q", output)
		}
		if m[1] == compilerVersion {
			log.Printf("compiler already at version %v , nothing to do.", compilerVersion)
			os.Exit(0)
		}
		if err := os.Remove(jarFile); err != nil {
			log.Fatalf("Could not remove %v: %v", jarFile, err)
		}
	} else {
		if !os.IsNotExist(err) {
			log.Fatalf("Could not stat %v: %v", jarFile, err)
		}
	}

	// otherwise, download compiler
	log.Printf("Getting closure compiler version %s.\n", compilerVersion)
	if err := os.MkdirAll(destDir, 0755); err != nil {
		log.Fatal(err)
	}
	if err := os.Chdir(destDir); err != nil {
		log.Fatal(err)
	}
	zipFilename := "compiler-" + compilerVersion + ".zip"
	compilerURL := compilerDirURL + zipFilename
	resp, err := http.Get(compilerURL)
	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()
	f, err := os.Create(zipFilename)
	if err != nil {
		log.Fatal(err)
	}
	if _, err := io.Copy(f, resp.Body); err != nil {
		log.Fatal(err)