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// In order to use YAML to define your CLI you must compile clap with the "yaml" feature because
// it's **not** included by default.
//
// In order to do this, ensure your Cargo.toml looks like one of the following:
//
// [dependencies.clap]
// features = ["yaml"]
//
// __OR__
//
// [dependencies]
// clap = { features = ["yaml"] }
// Using yaml requires calling a clap macro `load_yaml!()` so we must use the '#[macro_use]'
// directive
#[macro_use]
extern crate clap;
#[cfg(feature = "yaml")]
fn main() {
use clap::App;
// To load a yaml file containing our CLI definition such as the example '17_yaml.yml' we can
// use the convenience macro which loads the file at compile relative to the current file
// similar to how modules are found.
//
// Then we pass that yaml object to App to build the CLI.
//
// Finally we call get_matches() to start the parsing process. We use the matches just as we
// normally would
let yml = load_yaml!("17_yaml.yml");
let m = App::from_yaml(yml).get_matches();
// Because the example 17_yaml.yml is rather large we'll just look a single arg so you can
// see that it works...
if let Some(mode) = m.value_of("mode") {
match mode {
"vi" => println!("You are using vi"),
"emacs" => println!("You are using emacs..."),
_ => unreachable!()
}
} else {
println!("--mode <MODE> wasn't used...");
}
}
#[cfg(not(feature = "yaml"))]
fn main() {
// As stated above, if clap is not compiled with the YAML feature, it is disabled.
println!("YAML feature is disabled.");
println!("Pass --features yaml to cargo when trying this example.");
}
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