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
	}
}

// getDepList get 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 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 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 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 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"))
	}
	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 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 := []string{"go", "build"}
	cmdArgs = append(cmdArgs, args...)
	if len(ctx.String("o")) > 0 {
		cmdArgs = append(cmdArgs, "-o")
		cmdArgs = append(cmdArgs, ctx.String("o"))
	}
	if len(ctx.String("tags")) > 0 {
		cmdArgs = append(cmdArgs, "-tags")
		cmdArgs = append(cmdArgs, ctx.String("tags"))
	}
	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 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 runInstall(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

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

func runBin(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
	}

	// Check if given directory exists if specified.
	if ctx.IsSet("dir") && !base.IsDir(ctx.String("dir")) {
		errors.SetError(fmt.Errorf("Indicated path does not exist or not a directory"))
		return
	}

	// Backup exsited .vendor.
	if base.IsExist(setting.VENDOR) {
		os.Rename(setting.VENDOR, setting.VENDOR+".bak")
		defer func() {
			os.Rename(setting.VENDOR+".bak", setting.VENDOR)
		}()
	}

	// Parse package version.
	info := ctx.Args().First()
	pkgPath := info
	n := doc.NewNode(pkgPath, doc.BRANCH, "", "", true)
	if i := strings.Index(info, "@"); i > -1 {
		pkgPath = info[:i]
		var err error
		tp, val, dwn, err := validPkgInfo(info[i+1:])
		if err != nil {
			errors.SetError(err)
			return
		}
		n = doc.NewNode(pkgPath, tp, val, dwn, !ctx.Bool("download"))
	}

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

	if err := downloadPackages(".", ctx, []*doc.Node{n}); err != nil {
		errors.SetError(err)
		return
	}

	// Check if previous steps were successful.
	if !n.IsExist() {
		errors.SetError(fmt.Errorf("Download steps weren't successful"))
		return
	}

	tmpVendor := path.Join("vendor", path.Base(n.RootPath))
	os.RemoveAll(tmpVendor)
	os.RemoveAll(setting.VENDOR)
	defer func() {
		os.RemoveAll(tmpVendor)
		os.RemoveAll(setting.VENDOR)
	}()

	// FIXME: should use .gopm/temp path.
	if err := autoLink(n.InstallPath, tmpVendor); err != nil {
		errors.SetError(fmt.Errorf("Fail to link slef: %v", err))
		return
	}

	os.Chdir(tmpVendor)
	oldWorkDir := setting.WorkDir
	setting.WorkDir = path.Join(setting.WorkDir, tmpVendor)
	if !setting.Debug {
		defer func() {
			os.Chdir(oldWorkDir)
			os.RemoveAll("vendor")
			os.RemoveAll(setting.VENDOR)
		}()
	}

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

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

	log.Info("Installing...")

//.........这里部分代码省略.........

func linkVendors(ctx *cli.Context, optTarget string) error {
	gfPath := path.Join(setting.WorkDir, setting.GOPMFILE)
	gf, target, err := parseGopmfile(gfPath)
	if err != nil {
		return fmt.Errorf("fail to parse gopmfile: %v", err)
	}
	if len(optTarget) > 0 {
		target = optTarget
	}
	rootPath := doc.GetRootPath(target)

	// TODO: local support.

	// Make link of self.
	log.Debug("Linking %s...", rootPath)
	from := setting.WorkDir
	to := path.Join(setting.DefaultVendorSrc, rootPath)
	if setting.Debug {
		log.Debug("Linking from %s to %s", from, to)
	}
	if err := autoLink(from, to); err != nil {
		return fmt.Errorf("fail to link self: %v", err)
	}

	// Check and loads dependency packages.
	log.Debug("Loading dependencies...")
	imports, err := doc.ListImports(target, rootPath, setting.DefaultVendor, setting.WorkDir, ctx.String("tags"), ctx.Bool("test"))
	if err != nil {
		return fmt.Errorf("fail to list imports: %v", err)
	}

	stack := make([]*doc.Pkg, len(imports))
	for i, name := range imports {
		name := doc.GetRootPath(name)
		tp, val, _, err := validPkgInfo(gf.MustValue("deps", name))
		if err != nil {
			return fmt.Errorf("fail to validate package(%s): %v", name, err)
		}

		stack[i] = doc.NewPkg(name, tp, val)
	}

	// FIXME: at least link once, need a set
	lastIdx := len(stack) - 1
	for lastIdx >= 0 {
		pkg := stack[lastIdx]
		linkPath := path.Join(setting.DefaultVendorSrc, pkg.RootPath)
		if setting.Debug {
			log.Debug("Import path: %s", pkg.ImportPath)
			log.Debug("Linking path: %s", linkPath)
		}
		if base.IsExist(linkPath) {
			stack = stack[:lastIdx]
			lastIdx = len(stack) - 1
			continue
		}

		if pkg.IsEmptyVal() && setting.HasGOPATHSetting &&
			base.IsExist(path.Join(setting.InstallGopath, pkg.RootPath)) {
			stack = stack[:lastIdx]
			lastIdx = len(stack) - 1
			continue
		}

		venderPath := path.Join(setting.InstallRepoPath, pkg.RootPath+pkg.ValSuffix())
		if !base.IsExist(venderPath) && pkg.RootPath != "C" {
			//import "C" is cgo
			return fmt.Errorf("package not installed: %s", pkg.RootPath+pkg.VerSuffix())
		}

		log.Debug("Linking %s...", pkg.RootPath+pkg.ValSuffix())
		if err := autoLink(venderPath, linkPath); err != nil {
			return fmt.Errorf("fail to link dependency(%s): %v", pkg.RootPath, err)
		}
		stack = stack[:lastIdx]

		gf, target, err := parseGopmfile(path.Join(linkPath, setting.GOPMFILE))
		if err != nil {
			return fmt.Errorf("fail to parse gopmfile(%s): %v", linkPath, err)
		}
		// parseGopmfile only returns right target when parse work directory.
		target = pkg.RootPath
		rootPath := target
		imports, err := doc.ListImports(target, rootPath, setting.DefaultVendor, linkPath, ctx.String("tags"), ctx.Bool("test"))
		if err != nil {
			errors.SetError(err)
		}
		for _, name := range imports {
			if name == "C" {
				continue
			}
			name := doc.GetRootPath(name)
			tp, val, _, err := validPkgInfo(gf.MustValue("deps", name))
			if err != nil {
				return fmt.Errorf("fail to validate package(%s): %v", name, err)
			}

			stack = append(stack, doc.NewPkg(name, tp, val))
		}
		lastIdx = len(stack) - 1
//.........这里部分代码省略.........

// setup initializes and checks common environment variables.
func setup(ctx *cli.Context) (err error) {
	setting.Debug = ctx.GlobalBool("debug")
	log.NonColor = ctx.GlobalBool("noterm")
	log.Verbose = ctx.Bool("verbose")

	log.Info("App Version: %s", ctx.App.Version)

	setting.HomeDir, err = base.HomeDir()
	if err != nil {
		return fmt.Errorf("Fail to get home directory: %v", err)
	}
	setting.HomeDir = strings.Replace(setting.HomeDir, "\\", "/", -1)

	setting.InstallRepoPath = path.Join(setting.HomeDir, ".gopm/repos")
	if runtime.GOOS == "windows" {
		setting.IsWindows = true
	}
	os.MkdirAll(setting.InstallRepoPath, os.ModePerm)
	log.Info("Local repository path: %s", setting.InstallRepoPath)

	if !setting.LibraryMode || len(setting.WorkDir) == 0 {
		setting.WorkDir, err = os.Getwd()
		if err != nil {
			return fmt.Errorf("Fail to get work directory: %v", err)
		}
		setting.WorkDir = strings.Replace(setting.WorkDir, "\\", "/", -1)
	}
	setting.DefaultGopmfile = path.Join(setting.WorkDir, setting.GOPMFILE)
	setting.DefaultVendor = path.Join(setting.WorkDir, setting.VENDOR)
	setting.DefaultVendorSrc = path.Join(setting.DefaultVendor, "src")

	if !ctx.Bool("remote") {
		if ctx.Bool("local") {
			// gf, _, _, err := genGopmfile(ctx)
			// if err != nil {
			// 	return err
			// }
			// setting.InstallGopath = gf.MustValue("project", "local_gopath")
			// if ctx.Command.Name != "gen" {
			// 	if com.IsDir(setting.InstallGopath) {
			// 		log.Log("Indicated local GOPATH: %s", setting.InstallGopath)
			// 		setting.InstallGopath += "/src"
			// 	} else {
			// 		if setting.LibraryMode {
			// 			return fmt.Errorf("Local GOPATH does not exist or is not a directory: %s",
			// 				setting.InstallGopath)
			// 		}
			// 		log.Error("", "Invalid local GOPATH path")
			// 		log.Error("", "Local GOPATH does not exist or is not a directory:")
			// 		log.Error("", "\t"+setting.InstallGopath)
			// 		log.Help("Try 'go help gopath' to get more information")
			// 	}
			// }

		} else {
			// Get GOPATH.
			setting.InstallGopath = base.GetGOPATHs()[0]
			if base.IsDir(setting.InstallGopath) {
				log.Info("Indicated GOPATH: %s", setting.InstallGopath)
				setting.InstallGopath += "/src"
				setting.HasGOPATHSetting = true
			} else {
				if ctx.Bool("gopath") {
					return fmt.Errorf("Local GOPATH does not exist or is not a directory: %s",
						setting.InstallGopath)
				} else {
					// It's OK that no GOPATH setting
					// when user does not specify to use.
					log.Warn("No GOPATH setting available")
				}
			}
		}
	}

	setting.ConfigFile = path.Join(setting.HomeDir, ".gopm/data/gopm.ini")
	if err = setting.LoadConfig(); err != nil {
		return err
	}

	setting.PkgNameListFile = path.Join(setting.HomeDir, ".gopm/data/pkgname.list")
	if err = setting.LoadPkgNameList(); err != nil {
		return err
	}

	setting.LocalNodesFile = path.Join(setting.HomeDir, ".gopm/data/localnodes.list")
	if err = setting.LoadLocalNodes(); err != nil {
		return err
	}

	setting.LocalizeConfigFile = path.Join(setting.HomeDir, ".gopm/data/localize.ini")
	if err = setting.LoadLocalize(); err != nil {
		return err
	}
	return nil
}