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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:11:38 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:13:23 +0000 |
commit | 20431706a863f92cb37dc512fef6e48d192aaf2c (patch) | |
tree | 2867f13f5fd5437ba628c67d7f87309ccadcd286 /vendor/clap/examples/tutorial_builder/04_01_enum.rs | |
parent | Releasing progress-linux version 1.65.0+dfsg1-2~progress7.99u1. (diff) | |
download | rustc-20431706a863f92cb37dc512fef6e48d192aaf2c.tar.xz rustc-20431706a863f92cb37dc512fef6e48d192aaf2c.zip |
Merging upstream version 1.66.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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 e8cf70f5c..000000000 --- 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<'a>> { - Some(match self { - Mode::Fast => PossibleValue::new("fast"), - Mode::Slow => PossibleValue::new("slow"), - }) - } -} - -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"); - } - } -} |