1 use std::path::PathBuf;
2
3 use clap::{arg, command, value_parser, ArgAction, Command};
4
main()5 fn main() {
6 let matches = command!() // requires `cargo` feature
7 .arg(arg!([name] "Optional name to operate on"))
8 .arg(
9 arg!(
10 -c --config <FILE> "Sets a custom config file"
11 )
12 // We don't have syntax yet for optional options, so manually calling `required`
13 .required(false)
14 .value_parser(value_parser!(PathBuf)),
15 )
16 .arg(arg!(
17 -d --debug ... "Turn debugging information on"
18 ))
19 .subcommand(
20 Command::new("test")
21 .about("does testing things")
22 .arg(arg!(-l --list "lists test values").action(ArgAction::SetTrue)),
23 )
24 .get_matches();
25
26 // You can check the value provided by positional arguments, or option arguments
27 if let Some(name) = matches.get_one::<String>("name") {
28 println!("Value for name: {}", name);
29 }
30
31 if let Some(config_path) = matches.get_one::<PathBuf>("config") {
32 println!("Value for config: {}", config_path.display());
33 }
34
35 // You can see how many times a particular flag or argument occurred
36 // Note, only flags can have multiple occurrences
37 match matches
38 .get_one::<u8>("debug")
39 .expect("Count's are defaulted")
40 {
41 0 => println!("Debug mode is off"),
42 1 => println!("Debug mode is kind of on"),
43 2 => println!("Debug mode is on"),
44 _ => println!("Don't be crazy"),
45 }
46
47 // You can check for the existence of subcommands, and if found use their
48 // matches just as you would the top level cmd
49 if let Some(matches) = matches.subcommand_matches("test") {
50 // "$ myapp test" was run
51 if matches.get_flag("list") {
52 // "$ myapp test -l" was run
53 println!("Printing testing lists...");
54 } else {
55 println!("Not printing testing lists...");
56 }
57 }
58
59 // Continued program logic goes here...
60 }
61