1 use std::path::PathBuf;
2
3 use clap::{Parser, Subcommand};
4
5 #[derive(Parser)]
6 #[clap(author, version, about, long_about = None)]
7 struct Cli {
8 /// Optional name to operate on
9 #[clap(value_parser)]
10 name: Option<String>,
11
12 /// Sets a custom config file
13 #[clap(short, long, value_parser, value_name = "FILE")]
14 config: Option<PathBuf>,
15
16 /// Turn debugging information on
17 #[clap(short, long, action = clap::ArgAction::Count)]
18 debug: u8,
19
20 #[clap(subcommand)]
21 command: Option<Commands>,
22 }
23
24 #[derive(Subcommand)]
25 enum Commands {
26 /// does testing things
27 Test {
28 /// lists test values
29 #[clap(short, long, action)]
30 list: bool,
31 },
32 }
33
main()34 fn main() {
35 let cli = Cli::parse();
36
37 // You can check the value provided by positional arguments, or option arguments
38 if let Some(name) = cli.name.as_deref() {
39 println!("Value for name: {}", name);
40 }
41
42 if let Some(config_path) = cli.config.as_deref() {
43 println!("Value for config: {}", config_path.display());
44 }
45
46 // You can see how many times a particular flag or argument occurred
47 // Note, only flags can have multiple occurrences
48 match cli.debug {
49 0 => println!("Debug mode is off"),
50 1 => println!("Debug mode is kind of on"),
51 2 => println!("Debug mode is on"),
52 _ => println!("Don't be crazy"),
53 }
54
55 // You can check for the existence of subcommands, and if found use their
56 // matches just as you would the top level cmd
57 match &cli.command {
58 Some(Commands::Test { list }) => {
59 if *list {
60 println!("Printing testing lists...");
61 } else {
62 println!("Not printing testing lists...");
63 }
64 }
65 None => {}
66 }
67
68 // Continued program logic goes here...
69 }
70