arg

ezcli

Macro arg 

Source 
macro_rules! arg {
    (-$short_arg:tt: $desc:expr) => { ... };
    (--$long_arg:tt: $desc:expr) => { ... };
    (-$short_arg:tt, --$long_arg:tt: $desc:expr) => { ... };
    (-$short_arg:tt <$val:tt>: $desc:expr) => { ... };
    (--$long_arg:tt <$val:tt>: $desc:expr) => { ... };
    (-$short_arg:tt, --$long_arg:tt <$val:tt>: $desc:expr) => { ... };
    (-$short_arg:tt [$( $opt_val:tt )|*]: $desc:expr) => { ... };
    (--$long_arg:tt [$( $opt_val:tt )|*]: $desc:expr) => { ... };
    (-$short_arg:tt, --$long_arg:tt [$( $opt_val:tt )|*]: $desc:expr) => { ... };
}
Expand description

Output documentation for your arguments. Write argument name followed by a description. This macro replaces underscores in long-name argument token with hyphens (e.g.: flag!(--my_arg). -> "--my-arg")

use ezcli::arg;

// Flag (boolean) arguments
arg!(-a, --my_arg: "Description");
// Option arguments
arg!(-a, --my_arg <VALUE>: "Description");
// Option arguments with specific possible values
arg!(-a, --my_arg [V|VAL|VALUE]: "Description");