mirror of
https://github.com/clap-rs/clap
synced 2024-12-14 06:42:33 +00:00
20 lines
775 B
Rust
20 lines
775 B
Rust
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extern crate clap;
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use clap::{App, Arg};
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fn main() {
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// You can get a "default value" like feature by using Option<T>'s .unwrap_or() method
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//
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// Let's assume you have -c <config> argument to allow users to specify a configuration file
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// but you also want to support a default file, if none is specified.
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let matches = App::new("myapp").about("does awesome things")
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.arg(Arg::new("CONFIG")
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.help("The config file to use (default is \"config.json\")")
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.short("c")
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.takes_value(true))
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.get_matches();
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let config_file = matches.value_of("CONFIG").unwrap_or("config.json");
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// use config_file here...
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}
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