Trait clap::Args

source · [−]

pub trait Args: FromArgMatches + Sized {
    fn augment_args(cmd: Command<'_>) -> Command<'_>;
    fn augment_args_for_update(cmd: Command<'_>) -> Command<'_>;
}

Expand description

Parse a set of arguments into a user-defined container.

Implementing this trait lets a parent container delegate argument parsing behavior to Self. with:

#[clap(flatten)] args: ChildArgs: Attribute can only be used with struct fields that impl Args.
Variant(ChildArgs): No attribute is used with enum variants that impl Args.

See the derive reference for attributes and best practices.

NOTE: Deriving requires the [derive feature flag][crate::_features]

Example

#[derive(clap::Parser)]
struct Args {
   #[clap(flatten)]
   logging: LogArgs,
}

#[derive(clap::Args)]
struct LogArgs {
   #[clap(long, short = 'v', parse(from_occurrences))]
   verbose: i8,
}