clap/examples/24a_multicall_busybox.rs
Ed Page 2ac2fc6005 docs(examples): Be explicit in multicall for what clap does
This better matches our other examples
2021-11-17 15:23:31 -06:00

41 lines
1.5 KiB
Rust

//! Example of a `busybox-style` multicall program
//!
//! See the documentation for clap::AppSettings::Multicall for rationale.
//!
//! This example omits every command except true and false,
//! which are the most trivial to implement,
//! but includes the `--install` option as an example of why it can be useful
//! for the main program to take arguments that aren't applet subcommands.
use std::process::exit;
use clap::{App, AppSettings, Arg};
fn main() {
let app = App::new(env!("CARGO_CRATE_NAME"))
.setting(AppSettings::ArgRequiredElseHelp)
.arg(
Arg::new("install")
.long("install")
.about("Install hardlinks for all subcommands in path")
.exclusive(true)
.takes_value(true)
.default_missing_value("/usr/local/bin")
.use_delimiter(false),
)
.subcommand(App::new("true").about("does nothing successfully"))
.subcommand(App::new("false").about("does nothing unsuccessfully"));
#[cfg(feature = "unstable-multicall")]
let app = app.setting(AppSettings::Multicall);
let matches = app.get_matches();
if matches.occurrences_of("install") > 0 {
unimplemented!("Make hardlinks to the executable here");
}
match matches.subcommand_name() {
Some("true") => exit(0),
Some("false") => exit(1),
_ => unreachable!("parser should ensure only valid subcommand names are used"),
}
}