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docs: update example, mentioning the pseudo-flag pattern

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rami3l 2021-07-30 22:44:52 +02:00
parent a4a4d4c307
commit 38649cc0b5
1 changed files with 14 additions and 0 deletions
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14
examples/05_flag_args.rs
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@ -29,6 +29,15 @@ fn main() {
// also has a conflicts_with_all(Vec<&str>)
// and an exclusive(true)
)
.arg(
// Sometimes we might want to accept one of the following: `--pseudo-flag`, `--pseudo-flag=true`, `--pseudo-flag=false.`
// The following is the `pseudo-flag` pattern stated in https://github.com/clap-rs/clap/issues/1649#issuecomment-661274943
Arg::new("pseudo-flag") // Create a "pesudo-flag" with optional value
.possible_values(&["true", "false"]) // Limit that value to `true` of `false`
.long("pseudo-flag")
.min_values(0)
.max_values(1),
)
.arg("-c, --config=[FILE] 'sets a custom config file'")
.arg("<output> 'sets an output file'")
.get_matches();
@ -38,6 +47,11 @@ fn main() {
println!("Awesomeness is turned on");
}
// Same thing with `pseudo-flag`
if app.value_of("pseudo-flag") != Some("false") {
println!("Pseudo-flag is turned on");
}
// If we set the multiple option of a flag we can check how many times the user specified
//
// Note: if we did not specify the multiple option, and the user used "awesome" we would get