Help for Invalid Command Syntax

One pattern for robot commands (especially for robots managing infrastructure) is to use a CLI-like <verb> (... args) or <verb-noun> (... args) structure - e.g. build-app. These kinds of commands can have arbitrarily complex syntax, however; build-app (branch) (--skip-checks), or multiple forms of the command. To mimic a CLI environment, you can take advantage of the first-match behavior in the list of CommandMatchers for a given plugin:

CommandMatchers:
- Regex: '(?i:build-?app(?: (\w[\w-]*))?(?: (--skip-checks))?)'
  Command: build
- Regex: '(?i:build-?app\b.*)'
  Command: buildhelp

Then, add code to your plugin to handle the buildhelp command (ruby example):

when "buildhelp"
    bot_alias = bot.GetBotAttribute("alias")
    bot.Say("Usage for build-app:")
    bot.Say("#{bot_alias}build-app (branch) (--skip-checks)", "fixed")

The more complex forms of build-app should come first, if none of them match, it will fall-through to buildhelp command.

NOTE:

• If a user command matches multiple plugins, the robot will complain and do nothing; the first-match behavior only applies within a single list of CommandMatchers
• The help message should probably match the configured keyword help