Command

larpa

Trait Command 

Source 
pub trait Command: CommandInternal + Sized {
    const DESC: CommandDesc;

    // Provided methods
    fn from_args() -> Self { ... }
    fn from_iter<I>(args: I) -> Self
       where I: IntoIterator<Item: Into<OsString>> { ... }
    fn try_from_args() -> Result<Self> { ... }
    fn try_from_iter<I>(args: I) -> Result<Self>
       where I: IntoIterator<Item: Into<OsString>> { ... }
}
Expand description

A CLI command.

This trait cannot be implemented by hand, it can only be #[derive]d.

Required Associated Constants§

Source

const DESC: CommandDesc

The command description.

Provided Methods§

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fn from_args() -> Self

Tries to parse an instance of Self from the arguments passed to the program (env::args_os).

If parsing fails, an error will be printed and the process will exit with an appropriate error code.

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fn from_iter<I>(args: I) -> Self
where I: IntoIterator<Item: Into<OsString>>,

Tries to parse an instance of Self from the given arguments.

The first element yielded by args is treated as the program name (argv[0]).

If parsing fails, an error will be printed and the process will exit with an appropriate error code.

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fn try_from_args() -> Result<Self>

Tries to parse an instance of Self from the arguments passed to the program (env::args_os).

If parsing fails, an Error is returned to the caller.

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fn try_from_iter<I>(args: I) -> Result<Self>
where I: IntoIterator<Item: Into<OsString>>,

Tries to parse an instance of Self from the given arguments.

The first element yielded by args is treated as the program name (argv[0]).

If parsing fails, an Error is returned to the caller.

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors§