func getByGopmfile(ctx *cli.Context) error {
	// Make sure gopmfile exists and up-to-date.
	gf, target, err := parseGopmfile(setting.GOPMFILE)
	if err != nil {
		return err
	}

	imports, err := getDepList(ctx, target, setting.WorkDir, setting.DefaultVendor)
	if err != nil {
		return err
	}

	// Check if dependency has version.
	nodes := make([]*doc.Node, 0, len(imports))
	for _, name := range imports {
		name = doc.GetRootPath(name)
		n := doc.NewNode(name, doc.BRANCH, "", !ctx.Bool("download"))

		// Check if user specified the version.
		if v := gf.MustValue("deps", name); len(v) > 0 {
			n.Type, n.Value, err = validPkgInfo(v)
			n = doc.NewNode(name, n.Type, n.Value, !ctx.Bool("download"))
		}
		nodes = append(nodes, n)
	}

	return getPackages(target, ctx, nodes)
}

// getDepList gets list of dependencies in root path format and nature order.
func getDepList(ctx *cli.Context, target, pkgPath, vendor string) ([]string, error) {
	vendorSrc := path.Join(vendor, "src")
	rootPath := doc.GetRootPath(target)
	// If work directory is not in GOPATH, then need to setup a vendor path.
	if !setting.HasGOPATHSetting || !strings.HasPrefix(pkgPath, setting.InstallGopath) {
		// Make link of self.
		log.Debug("Linking %s...", rootPath)
		from := pkgPath
		to := path.Join(vendorSrc, rootPath)
		if setting.Debug {
			log.Debug("Linking from %s to %s", from, to)
		}
		if err := autoLink(from, to); err != nil {
			return nil, err
		}
	}

	imports, err := doc.ListImports(target, rootPath, vendor, pkgPath, ctx.String("tags"), ctx.Bool("test"))
	if err != nil {
		return nil, err
	}

	list := make([]string, 0, len(imports))
	for _, name := range imports {
		name = doc.GetRootPath(name)
		if !base.IsSliceContainsStr(list, name) {
			list = append(list, name)
		}
	}
	sort.Strings(list)
	return list, nil
}

func runTest(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	os.RemoveAll(setting.DefaultVendor)
	if !setting.Debug {
		defer os.RemoveAll(setting.DefaultVendor)
	}

	if err := linkVendors(ctx, ""); err != nil {
		errors.SetError(err)
		return
	}

	log.Info("Testing...")

	cmdArgs := []string{"go", "test"}
	cmdArgs = append(cmdArgs, ctx.Args()...)
	if err := execCmd(setting.DefaultVendor, setting.WorkDir, cmdArgs...); err != nil {
		errors.SetError(fmt.Errorf("fail to run program: %v", err))
		return
	}

	log.Info("Command executed successfully!")
}

func runConfigUnset(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	if len(ctx.Args()) != 1 {
		errors.SetError(fmt.Errorf("Incorrect number of arguments for command: should have 1"))
		return
	}

	var err error
	switch ctx.Args().First() {
	case "proxy":
		err = setting.DeleteConfigOption("settings", "HTTP_PROXY")
	case "github":
		if err = setting.DeleteConfigOption("github", "CLIENT_ID"); err != nil {
			errors.SetError(err)
			return
		}
		err = setting.DeleteConfigOption("github", "CLIENT_SECRET")
	}
	if err != nil {
		errors.SetError(err)
		return
	}
}

func runClean(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	os.RemoveAll(path.Join(setting.HomeDir, ".gopm/temp"))
	if ctx.Bool("all") {
		os.RemoveAll(setting.InstallRepoPath)
	}
}

func runBuild(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	if err := buildBinary(ctx, ctx.Args()...); err != nil {
		errors.SetError(err)
		return
	}

	log.Info("Command executed successfully!")
}

func getByPaths(ctx *cli.Context) error {
	nodes := make([]*doc.Node, 0, len(ctx.Args()))
	for _, info := range ctx.Args() {
		pkgPath := info
		n := doc.NewNode(pkgPath, doc.BRANCH, "", !ctx.Bool("download"))

		if i := strings.Index(info, "@"); i > -1 {
			pkgPath = info[:i]
			tp, val, err := validPkgInfo(info[i+1:])
			if err != nil {
				return err
			}
			n = doc.NewNode(pkgPath, tp, val, !ctx.Bool("download"))
		}

		// Check package name.
		if !strings.Contains(pkgPath, "/") {
			tmpPath, err := setting.GetPkgFullPath(pkgPath)
			if err != nil {
				return err
			}
			if tmpPath != pkgPath {
				n = doc.NewNode(tmpPath, n.Type, n.Value, n.IsGetDeps)
			}
		}
		nodes = append(nodes, n)
	}
	return getPackages(".", ctx, nodes)
}

func runTest(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	if err := linkVendors(ctx, ""); err != nil {
		errors.SetError(err)
		return
	}

	log.Info("Testing...")

	cmdArgs := []string{"go", "test"}
	if len(ctx.String("tags")) > 0 {
		cmdArgs = append(cmdArgs, "-tags")
		cmdArgs = append(cmdArgs, ctx.String("tags"))
	}
	if ctx.IsSet("verbose") {
		cmdArgs = append(cmdArgs, "-v")
	}
	cmdArgs = append(cmdArgs, ctx.Args()...)
	if err := execCmd(setting.DefaultVendor, setting.WorkDir, cmdArgs...); err != nil {
		errors.SetError(fmt.Errorf("fail to run program: %v", err))
		return
	}

	log.Info("Command executed successfully!")
}

func getPackages(target string, ctx *cli.Context, nodes []*doc.Node) error {
	if err := downloadPackages(target, ctx, nodes); err != nil {
		return err
	}
	if err := setting.SaveLocalNodes(); err != nil {
		return err
	}

	log.Info("%d package(s) downloaded, %d failed", downloadCount, failConut)
	if ctx.GlobalBool("strict") && failConut > 0 && !setting.LibraryMode {
		return fmt.Errorf("fail to download some packages")
	}
	return nil
}

func runConfigSetProxy(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	if len(ctx.Args()) != 1 {
		errors.SetError(fmt.Errorf("Incorrect number of arguments for command: should have 1"))
		return
	}
	if err := setting.SetConfigValue("settings", "HTTP_PROXY", ctx.Args().First()); err != nil {
		errors.SetError(err)
		return
	}
}

func runBuild(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	os.RemoveAll(setting.DefaultVendor)
	if !setting.Debug {
		defer os.RemoveAll(setting.DefaultVendor)
	}
	if err := buildBinary(ctx, ctx.Args()...); err != nil {
		errors.SetError(err)
		return
	}

	log.Info("Command executed successfully!")
}

func runConfigGet(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	if len(ctx.Args()) != 1 {
		errors.SetError(fmt.Errorf("Incorrect number of arguments for command: should have 1"))
		return
	}
	switch ctx.Args().First() {
	case "proxy":
		fmt.Printf("[%s]\n", "settings")
		showSettingString("settings", "HTTP_PROXY")
	case "github":
		fmt.Printf("[%s]\n", "github")
		showSettingString("github", "CLIENT_ID")
		showSettingString("github", "CLIENT_SECRET")
	}
}

func buildBinary(ctx *cli.Context, args ...string) error {
	_, target, err := parseGopmfile(setting.GOPMFILE)
	if err != nil {
		return err
	}

	if err := linkVendors(ctx, ""); err != nil {
		return err
	}

	log.Info("Building...")

	cmdArgs := append([]string{"go", "build"}, args...)

	// Set output binary name
	cmdArgs = append(cmdArgs, "-o")
	if ctx.IsSet("o") {
		cmdArgs = append(cmdArgs, ctx.String("o"))
	} else {
		cmdArgs = append(cmdArgs, path.Base(target))
	}

	if len(ctx.String("tags")) > 0 {
		cmdArgs = append(cmdArgs, "-tags")
		cmdArgs = append(cmdArgs, ctx.String("tags"))
	}

	log.Debug("Args: %v", cmdArgs)

	if err := execCmd(setting.DefaultVendor, setting.WorkDir, cmdArgs...); err != nil {
		return fmt.Errorf("fail to build program: %v", err)
	}

	if setting.IsWindowsXP {
		fName := path.Base(target)
		binName := fName + ".exe"
		os.Remove(binName)
		exePath := path.Join(setting.DefaultVendorSrc, target, binName)
		if base.IsFile(exePath) {
			if err := os.Rename(exePath, path.Join(setting.WorkDir, binName)); err != nil {
				return fmt.Errorf("fail to move binary: %v", err)
			}
		} else {
			log.Warn("No binary generated")
		}
	}
	return nil
}

func runInstall(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	os.RemoveAll(setting.DefaultVendor)
	if !setting.Debug {
		defer os.RemoveAll(setting.DefaultVendor)
	}

	if err := linkVendors(ctx, ""); err != nil {
		errors.SetError(err)
		return
	}

	// Get target name.
	gfPath := path.Join(setting.WorkDir, setting.GOPMFILE)
	_, target, err := parseGopmfile(gfPath)
	if err != nil {
		errors.SetError(fmt.Errorf("fail to parse gopmfile: %v", err))
		return
	}

	log.Info("Installing...")

	cmdArgs := []string{"go", "install"}
	if ctx.Bool("verbose") {
		cmdArgs = append(cmdArgs, "-v")
	}
	cmdArgs = append(cmdArgs, target)
	if err := execCmd(setting.DefaultVendor, setting.WorkDir, cmdArgs...); err != nil {
		errors.SetError(fmt.Errorf("fail to run program: %v", err))
		return
	}

	log.Info("Command executed successfully!")
}

// downloadPackage downloads package either use version control tools or not.
func downloadPackage(ctx *cli.Context, n *doc.Node) (*doc.Node, []string, error) {

	// fmt.Println(n.VerString())
	log.Info("Downloading package: %s", n.VerString())
	downloadCache.Set(n.VerString())

	vendor := base.GetTempDir()
	defer os.RemoveAll(vendor)

	var (
		err     error
		imports []string
		srcPath string
	)

	// Check if only need to use VCS tools.
	vcs := doc.GetVcsName(n.InstallGopath)
	// If update, gopath and VCS tools set then use VCS tools to update the package.
	if ctx.Bool("update") && (ctx.Bool("gopath") || ctx.Bool("local")) && len(vcs) > 0 {
		if err = n.UpdateByVcs(vcs); err != nil {
			return nil, nil, fmt.Errorf("fail to update by VCS(%s): %v", n.ImportPath, err)
		}
		srcPath = n.InstallGopath
	} else {
		if !n.IsGetDepsOnly || !n.IsExist() {
			// Get revision value from local records.
			n.Revision = setting.LocalNodes.MustValue(n.RootPath, "value")
			if err = n.DownloadGopm(ctx); err != nil {
				errors.AppendError(errors.NewErrDownload(n.ImportPath + ": " + err.Error()))
				failConut++
				os.RemoveAll(n.InstallPath)
				return nil, nil, nil
			}
		}
		srcPath = n.InstallPath
	}

	if n.IsGetDeps {
		imports, err = getDepList(ctx, n.ImportPath, srcPath, vendor)
		if err != nil {
			return nil, nil, fmt.Errorf("fail to list imports(%s): %v", n.ImportPath, err)
		}
		if setting.Debug {
			log.Debug("New imports: %v", imports)
		}
	}
	return n, imports, err
}

func runConfigSetGitHub(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	if len(ctx.Args()) != 2 {
		errors.SetError(fmt.Errorf("Incorrect number of arguments for command: should have 2"))
		return
	}
	if err := setting.SetConfigValue("github", "CLIENT_ID", ctx.Args().First()); err != nil {
		errors.SetError(err)
		return
	}
	if err := setting.SetConfigValue("github", "CLIENT_SECRET", ctx.Args().Get(1)); err != nil {
		errors.SetError(err)
		return
	}
}

func runGet(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	// Check option conflicts.
	hasConflict := false
	names := ""
	switch {
	case ctx.Bool("local") && ctx.Bool("gopath"):
		hasConflict = true
		names = "'--local, -l' and '--gopath, -g'"
	case ctx.Bool("local") && ctx.Bool("remote"):
		hasConflict = true
		names = "'--local, -l' and '--remote, -r'"
	case ctx.Bool("gopath") && ctx.Bool("remote"):
		hasConflict = true
		names = "'--gopath, -g' and '--remote, -r'"
	}
	if hasConflict {
		errors.SetError(fmt.Errorf("Command options have conflicts: %s", names))
		return
	}

	var err error
	// Check number of arguments to decide which function to call.
	if len(ctx.Args()) == 0 {
		if ctx.Bool("download") {
			errors.SetError(fmt.Errorf("Not enough arguments for option: '--download, -d'"))
			return
		}
		err = getByGopmfile(ctx)
	} else {
		err = getByPaths(ctx)
	}
	if err != nil {
		errors.SetError(err)
	}
}

func runGen(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	gfPath := path.Join(setting.WorkDir, setting.GOPMFILE)
	if !setting.HasGOPATHSetting && !base.IsFile(gfPath) {
		log.Warn("Dependency list may contain package itself without GOPATH setting and gopmfile.")
	}
	gf, target, err := parseGopmfile(gfPath)
	if err != nil {
		errors.SetError(err)
		return
	}

	list, err := getDepList(ctx, target, setting.WorkDir, setting.DefaultVendor)
	if err != nil {
		errors.SetError(err)
		return
	}
	for _, name := range list {
		// Check if user has specified the version.
		if val := gf.MustValue("deps", name); len(val) == 0 {
			gf.SetValue("deps", name, "")
		}
	}

	// Check resources.
	if _, err = gf.GetValue("res", "include"); err != nil {
		resList := make([]string, 0, len(setting.CommonRes))
		for _, res := range setting.CommonRes {
			if base.IsExist(res) {
				resList = append(resList, res)
			}
		}
		gf.SetValue("res", "include", strings.Join(resList, "|"))
	}

	if err = setting.SaveGopmfile(gf, gfPath); err != nil {
		errors.SetError(err)
		return
	}

	if ctx.Bool("local") {
		localGopath := gf.MustValue("project", "local_gopath")
		if len(localGopath) == 0 {
			localGopath = "./vendor"
			gf.SetValue("project", "local_gopath", localGopath)
			if err = setting.SaveGopmfile(gf, gfPath); err != nil {
				errors.SetError(err)
				return
			}
		}

		for _, name := range []string{"src", "pkg", "bin"} {
			os.MkdirAll(path.Join(localGopath, name), os.ModePerm)
		}
	}

	log.Info("Generate gopmfile successfully!")
}

func runUpdate(ctx *cli.Context) {
	if setting.LibraryMode {
		errors.SetError(fmt.Errorf("Library mode does not support update command"))
		return
	}
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	isAnythingUpdated := false
	localVerInfo := loadLocalVerInfo()

	// Get remote version info.
	var remoteVerInfo version
	if err := base.HttpGetJSON(doc.HttpClient, "http://gopm.io/VERSION.json", &remoteVerInfo); err != nil {
		log.Fatal("Fail to fetch VERSION.json: %v", err)
	}

	// Package name list.
	if remoteVerInfo.PackageNameList > localVerInfo.PackageNameList {
		log.Info("Updating pkgname.list...%v > %v",
			localVerInfo.PackageNameList, remoteVerInfo.PackageNameList)
		data, err := base.HttpGetBytes(doc.HttpClient, "https://raw.githubusercontent.com/gpmgo/docs/master/pkgname.list", nil)
		if err != nil {
			log.Warn("Fail to update pkgname.list: %v", err)
		} else {
			if err = ioutil.WriteFile(setting.PkgNameListFile, data, os.ModePerm); err != nil {
				log.Fatal("Fail to save pkgname.list: %v", err)
			}
			log.Info("Update pkgname.list to %v succeed!", remoteVerInfo.PackageNameList)
			isAnythingUpdated = true
		}
	}

	// Gopm.
	if remoteVerInfo.Gopm > setting.VERSION {
		log.Info("Updating gopm...%v > %v", setting.VERSION, remoteVerInfo.Gopm)

		tmpDir := base.GetTempDir()
		tmpBinPath := path.Join(tmpDir, "gopm")
		if runtime.GOOS == "windows" {
			tmpBinPath += ".exe"
		}

		os.MkdirAll(path.Dir(tmpBinPath), os.ModePerm)
		os.Remove(tmpBinPath)

		// Fetch code.
		args := []string{"bin", "-u", "-r", "-d=" + tmpDir}
		if ctx.Bool("verbose") {
			args = append(args, "-v")
		}
		args = append(args, "github.com/gpmgo/gopm")
		stdout, stderr, err := base.ExecCmd("gopm", args...)
		if err != nil {
			log.Fatal("Fail to execute 'bin -u -r -d=/Users/jiahuachen/.gopm/temp -v github.com/gpmgo/gopm: %s", stderr)
		}
		if len(stdout) > 0 {
			fmt.Print(stdout)
		}

		// Check if previous steps were successful.
		if !base.IsExist(tmpBinPath) {
			log.Error("Fail to continue command")
			log.Fatal("Previous steps weren't successful, no binary produced")
		}

		movePath, err := execPath()
		if err != nil {
			log.Fatal("Fail to get execute path: %v", err)
		}
		log.Info("New binary will be replaced for %s", movePath)
		// Move binary to given directory.
		if runtime.GOOS != "windows" {
			err := os.Rename(tmpBinPath, movePath)
			if err != nil {
				log.Fatal("Fail to move binary: %v", err)
			}
			os.Chmod(movePath+"/"+path.Base(tmpBinPath), os.ModePerm)
		} else {
			batPath := path.Join(tmpDir, "update.bat")
			f, err := os.Create(batPath)
			if err != nil {
				log.Error("Update", "Fail to generate bat file")
				log.Fatal("", err.Error())
			}
			f.WriteString("@echo off\r\n")
			f.WriteString(fmt.Sprintf("ping -n 1 127.0.0.1>nul\r\ncopy \"%v\" \"%v\" >nul\r\ndel \"%v\" >nul\r\n\r\n",
				tmpBinPath, movePath, tmpBinPath))
			f.Close()

			attr := &os.ProcAttr{
				Dir:   setting.WorkDir,
				Env:   os.Environ(),
				Files: []*os.File{os.Stdin, os.Stdout, os.Stderr},
			}

			if _, err = os.StartProcess(batPath, []string{batPath}, attr); err != nil {
				log.Error("Update", "Fail to start bat process")
//.........这里部分代码省略.........

func runGet(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	// Check option conflicts.
	hasConflict := false
	names := ""
	switch {
	case ctx.Bool("local") && ctx.Bool("gopath"):
		hasConflict = true
		names = "'--local, -l' and '--gopath, -g'"
	case ctx.Bool("local") && ctx.Bool("remote"):
		hasConflict = true
		names = "'--local, -l' and '--remote, -r'"
	case ctx.Bool("gopath") && ctx.Bool("remote"):
		hasConflict = true
		names = "'--gopath, -g' and '--remote, -r'"
	}
	if hasConflict {
		errors.SetError(fmt.Errorf("Command options have conflicts: %s", names))
		return
	}

	var err error
	// Check number of arguments to decide which function to call.
	if len(ctx.Args()) == 0 {
		if ctx.Bool("download") {
			errors.SetError(fmt.Errorf("Not enough arguments for option: '--download, -d'"))
			return
		}
		err = getByGopmfile(ctx)
	} else {
		err = getByPaths(ctx)
	}
	if err != nil {
		errors.SetError(err)
		return
	}

	if len(ctx.Args()) > 0 && ctx.Bool("save") {
		gf, _, err := parseGopmfile(setting.GOPMFILE)
		if err != nil {
			errors.SetError(err)
			return
		}

		for _, info := range ctx.Args() {
			if i := strings.Index(info, "@"); i > -1 {
				gf.SetValue("deps", info[:i], info[i+1:])
			} else {
				gf.SetValue("deps", info, "")
			}
		}
		setting.SaveGopmfile(gf, setting.GOPMFILE)
	}
}