clap/examples/tutorial_builder/01_quick.rs

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Rust
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use clap::{arg, command, Command};
use std::path::Path;
fn main() {
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let matches = command!()
.arg(arg!([name] "Optional name to operate on"))
.arg(
arg!(
-c --config <FILE> "Sets a custom config file"
)
// We don't have syntax yet for optional options, so manually calling `required`
.required(false)
// Support non-UTF8 paths
.allow_invalid_utf8(true),
)
.arg(arg!(
-d --debug ... "Turn debugging information on"
))
.subcommand(
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Command::new("test")
.about("does testing things")
.arg(arg!(-l --list "lists test values")),
)
.get_matches();
// You can check the value provided by positional arguments, or option arguments
if let Some(name) = matches.value_of("name") {
println!("Value for name: {}", name);
}
if let Some(raw_config) = matches.value_of_os("config") {
let config_path = Path::new(raw_config);
println!("Value for config: {}", config_path.display());
}
// You can see how many times a particular flag or argument occurred
// Note, only flags can have multiple occurrences
match matches.occurrences_of("debug") {
0 => println!("Debug mode is off"),
1 => println!("Debug mode is kind of on"),
2 => println!("Debug mode is on"),
_ => println!("Don't be crazy"),
}
// You can check for the existence of subcommands, and if found use their
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// matches just as you would the top level cmd
if let Some(matches) = matches.subcommand_matches("test") {
// "$ myapp test" was run
if matches.is_present("list") {
// "$ myapp test -l" was run
println!("Printing testing lists...");
} else {
println!("Not printing testing lists...");
}
}
// Continued program logic goes here...
}