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https://github.com/clap-rs/clap
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7e899cd340
This reverts commits 24cb8b1..d0abb37 from clap-rs/clap#1840 This is part of #16. clap-rs/clap#1840 wasn't the right call but we don't have time to make the decision now, so instead of having one option and changing it in 4.0, this reverts back to clap2 behavior.
51 lines
2.2 KiB
Rust
51 lines
2.2 KiB
Rust
use clap::{App, Arg};
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fn main() {
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// Subcommands function exactly like sub-Apps, because that's exactly what they are. Each
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// instance of a Subcommand can have its own version, author(s), Args, and even its own
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// subcommands.
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//
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// # Help and Version
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// Just like Apps, each subcommand will get its own "help" and "version" flags automatically
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// generated. Also, like Apps, you can override "-V" or "-h" safely and still get "--help" and
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// "--version" auto generated.
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//
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// NOTE: If you specify a subcommand for your App, clap will also autogenerate a "help"
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// subcommand along with "-h" and "--help" (applies to sub-subcommands as well).
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//
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// Just like arg() and args(), subcommands can be specified one at a time via subcommand() or
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// multiple ones at once with a Vec<App> provided to subcommands().
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let matches = App::new("MyApp")
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// Normal App and Arg configuration goes here...
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// In the following example assume we wanted an application which
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// supported an "add" subcommand, this "add" subcommand also took
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// one positional argument of a file to add:
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.subcommand(
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App::new("add") // The name we call argument with
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.about("Adds files to myapp") // The message displayed in "myapp -h"
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// or "myapp help"
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.version("0.1") // Subcommands can have independent version
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.author("Kevin K.") // And authors
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.arg(
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Arg::new("input") // And their own arguments
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.help("the file to add")
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.index(1)
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.required(true),
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),
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)
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.get_matches();
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// Most commonly, you'll get the name and matches at the same time
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match matches.subcommand() {
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Some(("add", sub_matches)) => println!(
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"'myapp add' was used, input is: {}",
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sub_matches
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.value_of("input")
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.expect("'input' is required and parsing will fail if its missing")
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),
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None => println!("No subcommand was used"),
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_ => println!("Some other subcommand was used"),
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}
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// Continued program logic goes here...
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}
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