Macro minus_or_plus_flag_arg 

macro_rules! minus_or_plus_flag_arg {
    ($struct_name:ident, $flag_char:literal, $desc:literal) => { ... };
}

Macro to define a struct that represents a shell built-in flag argument that can be enabled or disabled by specifying an option with a leading ‘+’ or ‘-’ character.

Arguments

• $struct_name - The identifier to be used for the struct to define.
• $flag_char - The character to use as the flag.
• $desc - The string description of the flag.