brew-cask.plugin.zsh

# Autocompletion for homebrew-cask.
#
# This script intercepts calls to the brew plugin and adds autocompletion
# for the cask subcommand.
#
# Author: https://github.com/pstadler

compdef _brew-cask brew

_brew-cask()
{
	local curcontext="$curcontext" state line
	typeset -A opt_args

	_arguments -C \
		':command:->command' \
		':subcmd:->subcmd' \
		'*::options:->options'

	case $state in
		(command)
			__call_original_brew
			cask_commands=(
				'cask:manage casks'
			)
			_describe -t commands 'brew cask command' cask_commands ;;

		(subcmd)
			case "$line[1]" in
				cask)
					if (( CURRENT == 3 )); then
						local -a subcommands
						subcommands=(
							"alfred:used to modify Alfred's scope to include the Caskroom"
							'audit:verifies installability of casks'
							'checklinks:checks for bad cask links'
							'create:creates a cask of the given name and opens it in an editor'
							'edit:edits the cask of the given name'
							'home:opens the homepage of the cask of the given name'
							'info:displays information about the cask of the given name'
							'install:installs the cask of the given name'
							'list:with no args, lists installed casks; given installed casks, lists installed files'
							'search:searches all known casks'
							'uninstall:uninstalls the cask of the given name'
						)
						_describe -t commands "brew cask subcommand" subcommands
					fi ;;

				*)
					__call_original_brew ;;
			esac ;;

		(options)
			local -a casks installed_casks
			local expl
			case "$line[2]" in
				list|uninstall)
					__brew_installed_casks
					_wanted installed_casks expl 'installed casks' compadd -a installed_casks ;;
				audit|edit|home|info|install)
					__brew_all_casks
					_wanted casks expl 'all casks' compadd -a casks ;;
			esac ;;
	esac
}

__brew_all_casks() {
	casks=(`brew cask search`)
}

__brew_installed_casks() {
	installed_casks=(`brew cask list`)
}

__call_original_brew()
{
	local ret=1
	_call_function ret _brew
	compdef _brew-cask brew
}

is there a way to use this outside ohmyzsh? maybe just dump it in fpath somewhere?