Knub Command Manager

Knub Command Manager is a library for managing and matching text-based commands. It was created for use in Knub, a Discord bot framework, but can also be used as standalone.

Features

• Command prefixes (e.g. !command where ! is the prefix)
• Regex support for prefixes and command names
• Required and optional parameters
• -options and -switches with shortcuts (e.g. -f)
  • Customizable option prefixes (defaults to -- and -)
• Parameter/option types with runtime validation and type conversion
  • Including custom types
• Default values for arguments/options
• "Rest arguments" (multiple arguments returned in an array) and "catch-all" arguments (treats the rest of the string as the value for that argument)
• Filters that are run before and after commands signature validation
  • "Pre-filters" (run before) are useful for e.g. checking if the command is valid to use in the current context. If a pre-filter fails, command matching is resumed to other potentially matching commands.
  • "Post-filters" (run after) are useful for e.g. command cooldowns. If a post-filter fails, command matching is not resumed and no error is returned, making the result equivalent to no command matching at all.
• Full TypeScript typings with generics for custom data passed to filters and argument/option type conversion functions and for extra data passed in command configuration

Installation

npm install knub-command-manager

Basic usage

import { CommandManager, parseSignature as p, string } from 'knub-command-manager';

const manager = new CommandManager({
  prefix: '!'
});

const command1 = manager.add('echo', p('<text:string>'));
const command2 = manager.add('ping', { ip: string() });

const matchedCommand = manager.findMatchingCommand('!echo hello');