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https://github.com/clap-rs/clap
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2ac2fc6005
This better matches our other examples
41 lines
1.5 KiB
Rust
41 lines
1.5 KiB
Rust
//! Example of a `busybox-style` multicall program
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//!
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//! See the documentation for clap::AppSettings::Multicall for rationale.
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//!
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//! This example omits every command except true and false,
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//! which are the most trivial to implement,
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//! but includes the `--install` option as an example of why it can be useful
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//! for the main program to take arguments that aren't applet subcommands.
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use std::process::exit;
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use clap::{App, AppSettings, Arg};
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fn main() {
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let app = App::new(env!("CARGO_CRATE_NAME"))
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.setting(AppSettings::ArgRequiredElseHelp)
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.arg(
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Arg::new("install")
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.long("install")
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.about("Install hardlinks for all subcommands in path")
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.exclusive(true)
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.takes_value(true)
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.default_missing_value("/usr/local/bin")
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.use_delimiter(false),
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)
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.subcommand(App::new("true").about("does nothing successfully"))
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.subcommand(App::new("false").about("does nothing unsuccessfully"));
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#[cfg(feature = "unstable-multicall")]
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let app = app.setting(AppSettings::Multicall);
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let matches = app.get_matches();
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if matches.occurrences_of("install") > 0 {
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unimplemented!("Make hardlinks to the executable here");
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}
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match matches.subcommand_name() {
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Some("true") => exit(0),
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Some("false") => exit(1),
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_ => unreachable!("parser should ensure only valid subcommand names are used"),
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}
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}
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