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Trait clap::Subcommand

source · [−]
pub trait Subcommand: FromArgMatches + Sized {
    fn augment_subcommands(app: App<'_>) -> App<'_>;

    fn augment_subcommands_for_update(app: App<'_>) -> App<'_>;

    fn has_subcommand(name: &str) -> bool;
}
Expand description

Parse a sub-command into a user-defined enum.

Implementing this trait let’s a parent container delegate subcommand behavior to Self. with:

  • #[clap(subcommand)] field: SubCmd: Attribute can be used with either struct fields or enum variants that impl Subcommand.
  • #[clap(flatten)] Variant(SubCmd): Attribute can only be used with enum variants that impl Subcommand.

Example

#[derive(clap::Clap)]
struct Args {
    #[clap(subcommand)]
    action: Action,
}

#[derive(clap::Subcommand)]
enum Action {
    Add,
    Remove,
}

Required methods

Append to App so it can instantiate Self.

See also IntoApp.

Append to App so it can update self.

This is used to implement #[clap(flatten)]

See also IntoApp.

Test whether Self can parse a specific subcommand

Implementations on Foreign Types

Implementors