diff options
Diffstat (limited to 'vendor/clap/examples/tutorial_builder/04_01_enum.rs')
-rw-r--r-- | vendor/clap/examples/tutorial_builder/04_01_enum.rs | 66 |
1 files changed, 0 insertions, 66 deletions
diff --git a/vendor/clap/examples/tutorial_builder/04_01_enum.rs b/vendor/clap/examples/tutorial_builder/04_01_enum.rs deleted file mode 100644 index aa9f41c..0000000 --- a/vendor/clap/examples/tutorial_builder/04_01_enum.rs +++ /dev/null @@ -1,66 +0,0 @@ -use clap::{arg, builder::PossibleValue, command, value_parser, ValueEnum}; - -#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord)] -enum Mode { - Fast, - Slow, -} - -// Can also be derived with feature flag `derive` -impl ValueEnum for Mode { - fn value_variants<'a>() -> &'a [Self] { - &[Mode::Fast, Mode::Slow] - } - - fn to_possible_value<'a>(&self) -> Option<PossibleValue> { - Some(match self { - Mode::Fast => PossibleValue::new("fast").help("Run swiftly"), - Mode::Slow => PossibleValue::new("slow").help("Crawl slowly but steadily"), - }) - } -} - -impl std::fmt::Display for Mode { - fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { - self.to_possible_value() - .expect("no values are skipped") - .get_name() - .fmt(f) - } -} - -impl std::str::FromStr for Mode { - type Err = String; - - fn from_str(s: &str) -> Result<Self, Self::Err> { - for variant in Self::value_variants() { - if variant.to_possible_value().unwrap().matches(s, false) { - return Ok(*variant); - } - } - Err(format!("invalid variant: {s}")) - } -} - -fn main() { - let matches = command!() // requires `cargo` feature - .arg( - arg!(<MODE>) - .help("What mode to run the program in") - .value_parser(value_parser!(Mode)), - ) - .get_matches(); - - // Note, it's safe to call unwrap() because the arg is required - match matches - .get_one::<Mode>("MODE") - .expect("'MODE' is required and parsing will fail if its missing") - { - Mode::Fast => { - println!("Hare"); - } - Mode::Slow => { - println!("Tortoise"); - } - } -} |