Trait clap::ArgEnum [−][src]
pub trait ArgEnum: Sized { const VARIANTS: &'static [&'static str]; fn from_str(input: &str, case_insensitive: bool) -> Result<Self, String>; fn as_arg(&self) -> Option<&'static str>; }
Expand description
Parse arguments into enums.
When deriving Clap
, a field whose type implements ArgEnum
can have the attribute
#[clap(arg_enum)]
. In addition to parsing, help and error messages may report possible
variants.
Example
#[derive(clap::Clap)] struct Args { #[clap(arg_enum)] level: Level, } #[derive(clap::ArgEnum)] enum Level { Debug, Info, Warning, Error, }
Associated Constants
const VARIANTS: &'static [&'static str]
const VARIANTS: &'static [&'static str]
All possible argument choices, in display order.
Required methods
Parse an argument into Self
.