commands 0.0.4

A command system for Rust. This provides a general command system which can be used in a variety of environments, including GUI applications and command line utilities. This is inspired by elements of the Lisp Machine, the Common Lisp Interface Manager (CLIM), router command line interfaces, and the TOPS-20 command line among other things.
Documentation 
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

/// Indicate the type of parameter, so that the correct class and node
/// structures are created.
#[derive(Clone, Copy, PartialEq)]
pub enum ParameterKind {
    /// This parameter is a flag parameter.
    Flag,
    /// This parameter is a named parameter.
    Named,
    /// This parameter is a simple parameter.
    Simple,
}

/// Minimum priority.
pub const PRIORITY_MINIMUM: i32 = -10000;
/// The default priority for a parameter.
pub const PRIORITY_PARAMETER: i32 = -10;
/// The default priority.
pub const PRIORITY_DEFAULT: i32 = 0;