Trait clap::Subcommand

pub trait Subcommand: FromArgMatches + Sized {
    // Required methods
    fn augment_subcommands(cmd: Command) -> Command;
    fn augment_subcommands_for_update(cmd: Command) -> Command;
    fn has_subcommand(name: &str) -> bool;
}

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

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

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

NOTE: Deriving requires the derive feature flag

Required Methods

fn augment_subcommands(cmd: Command) -> Command

Append to Command so it can instantiate Self.

See also CommandFactory.

fn augment_subcommands_for_update(cmd: Command) -> Command

Append to Command so it can update self.

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

See also CommandFactory.

fn has_subcommand(name: &str) -> bool

Test whether Self can parse a specific subcommand

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl<T> Subcommand for Box<T>

where T: Subcommand,

fn augment_subcommands(cmd: Command) -> Command

fn augment_subcommands_for_update(cmd: Command) -> Command

fn has_subcommand(name: &str) -> bool

Implementors