Golang Command.Get方法代码示例

// ShortHelp returns a formatted CLI helptext string, generated for the given command
func ShortHelp(rootName string, root *cmds.Command, path []string, out io.Writer) error {
	cmd, err := root.Get(path)
	if err != nil {
		return err
	}

	// default cmd to root if there is no path
	if path == nil && cmd == nil {
		cmd = root
	}

	pathStr := rootName
	if len(path) > 0 {
		pathStr += " " + strings.Join(path, " ")
	}

	fields := helpFields{
		Indent:      indentStr,
		Path:        pathStr,
		ArgUsage:    usageText(cmd),
		Tagline:     cmd.Helptext.Tagline,
		Synopsis:    cmd.Helptext.Synopsis,
		Description: cmd.Helptext.ShortDescription,
		Usage:       cmd.Helptext.Usage,
		MoreHelp:    (cmd != root),
	}

	// trim the extra newlines (see TrimNewlines doc)
	fields.TrimNewlines()

	// indent all fields that have been set
	fields.IndentAll()

	return shortHelpTemplate.Execute(out, fields)
}

// LongHelp writes a formatted CLI helptext string to a Writer for the given command
func LongHelp(rootName string, root *cmds.Command, path []string, out io.Writer) error {
	cmd, err := root.Get(path)
	if err != nil {
		return err
	}

	pathStr := rootName
	if len(path) > 0 {
		pathStr += " " + strings.Join(path, " ")
	}

	fields := helpFields{
		Indent:      indentStr,
		Path:        pathStr,
		ArgUsage:    usageText(cmd),
		Tagline:     cmd.Helptext.Tagline,
		Arguments:   cmd.Helptext.Arguments,
		Options:     cmd.Helptext.Options,
		Synopsis:    cmd.Helptext.Synopsis,
		Subcommands: cmd.Helptext.Subcommands,
		Description: cmd.Helptext.ShortDescription,
		Usage:       cmd.Helptext.Usage,
		MoreHelp:    (cmd != root),
	}

	if len(cmd.Helptext.LongDescription) > 0 {
		fields.Description = cmd.Helptext.LongDescription
	}

	// autogen fields that are empty
	if len(fields.Arguments) == 0 {
		fields.Arguments = strings.Join(argumentText(cmd), "\n")
	}
	if len(fields.Options) == 0 {
		fields.Options = strings.Join(optionText(cmd), "\n")
	}
	if len(fields.Subcommands) == 0 {
		fields.Subcommands = strings.Join(subcommandText(cmd, rootName, path), "\n")
	}
	if len(fields.Synopsis) == 0 {
		fields.Synopsis = generateSynopsis(cmd, pathStr)
	}

	// trim the extra newlines (see TrimNewlines doc)
	fields.TrimNewlines()

	// indent all fields that have been set
	fields.IndentAll()

	return longHelpTemplate.Execute(out, fields)
}

// Parse parses the data in a http.Request and returns a command Request object
func Parse(r *http.Request, root *cmds.Command) (cmds.Request, error) {
	if !strings.HasPrefix(r.URL.Path, ApiPath) {
		return nil, errors.New("Unexpected path prefix")
	}
	path := strings.Split(strings.TrimPrefix(r.URL.Path, ApiPath+"/"), "/")

	stringArgs := make([]string, 0)

	if err := apiVersionMatches(r); err != nil {
		if path[0] != "version" { // compatibility with previous version check
			return nil, err
		}
	}

	cmd, err := root.Get(path[:len(path)-1])
	if err != nil {
		// 404 if there is no command at that path
		return nil, ErrNotFound

	}

	if sub := cmd.Subcommand(path[len(path)-1]); sub == nil {
		if len(path) <= 1 {
			return nil, ErrNotFound
		}

		// if the last string in the path isn't a subcommand, use it as an argument
		// e.g. /objects/Qabc12345 (we are passing "Qabc12345" to the "objects" command)
		stringArgs = append(stringArgs, path[len(path)-1])
		path = path[:len(path)-1]
	} else {
		cmd = sub
	}

	opts, stringArgs2 := parseOptions(r)
	stringArgs = append(stringArgs, stringArgs2...)

	// count required argument definitions
	numRequired := 0
	for _, argDef := range cmd.Arguments {
		if argDef.Required {
			numRequired++
		}
	}

	// count the number of provided argument values
	valCount := len(stringArgs)

	args := make([]string, valCount)

	valIndex := 0
	requiredFile := ""
	for _, argDef := range cmd.Arguments {
		// skip optional argument definitions if there aren't sufficient remaining values
		if valCount-valIndex <= numRequired && !argDef.Required {
			continue
		} else if argDef.Required {
			numRequired--
		}

		if argDef.Type == cmds.ArgString {
			if argDef.Variadic {
				for _, s := range stringArgs {
					args[valIndex] = s
					valIndex++
				}
				valCount -= len(stringArgs)

			} else if len(stringArgs) > 0 {
				args[valIndex] = stringArgs[0]
				stringArgs = stringArgs[1:]
				valIndex++

			} else {
				break
			}
		} else if argDef.Type == cmds.ArgFile && argDef.Required && len(requiredFile) == 0 {
			requiredFile = argDef.Name
		}
	}

	optDefs, err := root.GetOptions(path)
	if err != nil {
		return nil, err
	}

	// create cmds.File from multipart/form-data contents
	contentType := r.Header.Get(contentTypeHeader)
	mediatype, _, _ := mime.ParseMediaType(contentType)

	var f *files.MultipartFile
	if mediatype == "multipart/form-data" {
		f = &files.MultipartFile{Mediatype: mediatype}
		f.Reader, err = r.MultipartReader()
		if err != nil {
			return nil, err
		}
	}

//.........这里部分代码省略.........