61 lines
2.0 KiB
Rust
61 lines
2.0 KiB
Rust
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use std::path::PathBuf;
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use clap::{arg, command, value_parser, ArgAction, Command};
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fn main() {
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let matches = command!() // requires `cargo` feature
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.arg(arg!([name] "Optional name to operate on"))
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.arg(
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arg!(
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-c --config <FILE> "Sets a custom config file"
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)
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// We don't have syntax yet for optional options, so manually calling `required`
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.required(false)
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.value_parser(value_parser!(PathBuf)),
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)
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.arg(arg!(
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-d --debug ... "Turn debugging information on"
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))
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.subcommand(
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Command::new("test")
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.about("does testing things")
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.arg(arg!(-l --list "lists test values").action(ArgAction::SetTrue)),
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)
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.get_matches();
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// You can check the value provided by positional arguments, or option arguments
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if let Some(name) = matches.get_one::<String>("name") {
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println!("Value for name: {name}");
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}
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if let Some(config_path) = matches.get_one::<PathBuf>("config") {
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println!("Value for config: {}", config_path.display());
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}
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// You can see how many times a particular flag or argument occurred
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// Note, only flags can have multiple occurrences
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match matches
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.get_one::<u8>("debug")
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.expect("Count's are defaulted")
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{
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0 => println!("Debug mode is off"),
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1 => println!("Debug mode is kind of on"),
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2 => println!("Debug mode is on"),
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_ => println!("Don't be crazy"),
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}
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// 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
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if let Some(matches) = matches.subcommand_matches("test") {
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// "$ myapp test" was run
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if matches.get_flag("list") {
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// "$ myapp test -l" was run
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println!("Printing testing lists...");
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} else {
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println!("Not printing testing lists...");
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}
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}
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// Continued program logic goes here...
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}
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