mirror of
https://github.com/clap-rs/clap
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befee6667b
This creates distinct tutorial examples from complex feature examples (more how-tos). Both sets are getting builder / derive versions (at least the critical ones).
25 lines
619 B
Rust
25 lines
619 B
Rust
use clap::{app_from_crate, arg};
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fn main() {
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let matches = app_from_crate!()
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.arg(
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arg!(<MODE>)
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.help("What mode to run the program in")
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.possible_values(["fast", "slow"]),
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)
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.get_matches();
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// Note, it's safe to call unwrap() because the arg is required
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match matches
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.value_of("MODE")
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.expect("'MODE' is required and parsing will fail if its missing")
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{
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"fast" => {
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println!("Hare");
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}
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"slow" => {
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println!("Tortoise");
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}
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_ => unreachable!(),
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}
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}
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