1  package dispatch2
 2  
 3  import (
 4  	"strings"
 5  )
 6  
 7  // ParseCommand attempts to match a string with [Command.Name] or [Command.Aliases]
 8  func parseCommand[Config any](cmds []Command[Config], cmd string) (found Command[Config], err error) {
 9  	if cmd == "" {
10  		err = ErrCommandCannotParseEmptyString
11  		/*
12  			flag.Usage()
13  
14  			fmt.Println("")
15  			PrintValidCommands(cmds)
16  		*/
17  		return
18  	}
19  
20  	for _, command := range cmds {
21  		if strings.EqualFold(cmd, command.Name()) {
22  			found = command
23  		}
24  
25  		if found != nil {
26  			if found.Name() != "" {
27  				break
28  			}
29  		}
30  
31  		for _, alias := range command.Aliases() {
32  			if strings.EqualFold(cmd, alias) {
33  				found = command
34  				break
35  			}
36  		}
37  	}
38  
39  	if found == nil {
40  		err = ErrCommandNotFound
41  		return
42  	}
43  
44  	return
45  }
46  
47  // ParseArgsForSubcommand parses the provided args cyclically through the
48  // [Command] slice and any associated subcommand, returning any error OR the
49  // final parsed [Command] and any remaining args.
50  func parseArgsForSubcommand[Config any](commands []Command[Config], args []string) (Command[Config], []string, error) {
51  	switch nargs := len(args); nargs {
52  	case 0:
53  		/*
54  			flag.Usage()
55  			PrintValidCommands(commands)
56  
57  			return Command{}, nil, ErrCommandRequired
58  		*/
59  
60  		return nil, nil, ErrCommandRequired
61  	case 1:
62  		command, err := parseCommand(commands, args[0])
63  		if err != nil {
64  			return command, args, err
65  		}
66  
67  		return command, nil, nil
68  	default:
69  		command, err := parseCommand(commands, args[0])
70  		if err != nil {
71  			return command, nil, err
72  		}
73  
74  		if command == nil {
75  			return nil, nil, ErrCommandNil
76  		}
77  
78  		if command.NSubcommands() == 0 {
79  			return command, args[1:], nil
80  		}
81  
82  		subcommand, argsLeft, err := parseArgsForSubcommand(command.Subcommands(), args[1:])
83  		if err != nil {
84  			if err == ErrCommandNotFound {
85  				return command, args[1:], nil
86  			}
87  
88  			return command, nil, err
89  		}
90  
91  		return subcommand, argsLeft, nil
92  	}
93  }