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diff --git a/completions/zsh/_brew_cask b/completions/zsh/_brew_cask
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+#compdef brew-cask
+#autoload
+
+# Zsh Autocompletion script for Homebrew Cask
+#   https://github.com/homebrew/brew
+
+# Authors:
+#   Patrick Stadler (https://github.com/pstadler)
+#   Josh McKinney (https://github.com/joshka)
+
+# only display the main commands (but enable completing aliases like 'ls')
+zstyle -T ':completion:*:*:*:brew-cask:*' tag-order && \
+	zstyle ':completion:*:*:*:brew-cask:*' tag-order 'commands'
+
+__brew_all_casks() {
+  local -a list
+  local expl
+  list=( $(brew cask search) )
+  _wanted list expl 'all casks' compadd -a list
+}
+
+__brew_installed_casks() {
+  local -a list
+  local expl
+  list=( $(brew cask list|sed 's/(!)//') )
+  _wanted list expl 'installed casks' compadd -a list
+}
+
+__brew_cask_commands() {
+  local -a commands
+  commands=(
+    'audit:verifies installability of Casks'
+    'cat:dump raw source of the given Cask to the standard output'
+    'cleanup:cleans up cached downloads and tracker symlinks'
+    'create:creates the given Cask and opens it in an editor'
+    'doctor:checks for configuration issues'
+    'edit:edits the given Cask'
+    'fetch:downloads remote application files to local cache'
+    'home:opens the homepage of the given Cask'
+    'info:displays information about the given Cask'
+    'install:installs the given Cask'
+    'list:with no args, lists installed Casks; given installed Casks, lists staged files'
+    'search:searches all known Casks'
+    'style:checks Cask style using RuboCop'
+    'uninstall:uninstalls the given Cask'
+    "update:a synonym for 'brew update'"
+    'zap:zaps all files associated with the given Cask'
+  )
+  _describe -t commands "brew cask command" commands
+}
+
+__brew_cask_aliases() {
+  local -a aliases
+  aliases=(
+    'dr'
+    'homepage'
+    'abv'
+    'ls'
+    '-S'
+    'rm'
+    'remove'
+  )
+  _describe -t commands "brew cask command aliases" aliases
+}
+
+__brew_cask_command() {
+  local command="$1"
+  local completion_func="_brew_cask_${command//-/_}"
+  declare -f "$completion_func" >/dev/null && "$completion_func" && return
+}
+
+_brew_cask_abv() {
+  _brew_cask_info
+}
+
+_brew_cask_audit() {
+  __brew_all_casks
+}
+
+_brew_cask_cat() {
+  __brew_all_casks
+}
+
+_brew_cask_cat() {
+  __brew_all_casks
+}
+
+_brew_cask_cleanup() {
+  _arguments '--outdated:only clean up cached downloads older than 10 days old'
+}
+
+_brew_cask_create() {
+  _arguments '*::token:'
+}
+
+_brew_cask_edit() {
+  __brew_all_casks
+}
+
+_brew_cask_fetch() {
+  _arguments : \
+    '--force:force re-download even if the files are already cached' \
+    '*::token:__brew_all_casks'
+}
+
+_brew_cask_home() {
+  __brew_all_casks
+}
+
+_brew_cask_homepage() {
+  __brew_cask_home
+}
+
+_brew_cask_info() {
+  __brew_all_casks
+}
+
+_brew_cask_install() {
+  _arguments : \
+    '--force:re-install even if the Cask appears to be already present' \
+    '--skip-cask-deps:skip any Cask dependencies' \
+    '--require-sha:abort installation if the Cask does not have a checksum defined' \
+    '*::token:__brew_all_casks'
+}
+
+_brew_cask_list() {
+  _arguments : \
+    '-1[format output in a single column]' \
+    '-l[format as detailed list]' \
+    '*::token:__brew_installed_casks'
+}
+
+_brew_cask_ls() {
+  _brew_cask_list
+}
+
+_brew_cask_remove() {
+  _brew_cask_uninstall
+}
+
+_brew_cask_rm() {
+  _brew_cask_uninstall
+}
+
+_brew_cask_style() {
+  _arguments : \
+    '--fix:auto-correct any style errors if possible' \
+    '*::token:__brew_all_casks'
+}
+
+_brew_cask_uninstall() {
+  _arguments : \
+    '--force:uninstall even if the Cask does not appear to be present' \
+    '*::token:__brew_installed_casks'
+}
+
+_brew_cask_zap() {
+  __brew_all_casks
+}
+
+_brew_cask()
+{
+  local curcontext="$curcontext" state state_descr line
+  typeset -A opt_args
+
+  _arguments -C : \
+    '--verbose:Give additional feedback during installation.' \
+    '--appdir=-:Target location for Applications. The default value is /Applications:' \
+    '--colorpickerdir=-:Target location for Color Pickers. The default value is ~/Library/ColorPickers.' \
+    '--prefpanedir=-:Target location for Preference Panes. The default value is ~/Library/PreferencePanes.' \
+    '--qlplugindir=-:Target location for QuickLook Plugins. The default value is ~/Library/QuickLook.' \
+    '--fontdir=-:Target location for Fonts. The default value is ~/Library/Fonts.' \
+    '--servicedir=-:Target location for Services. The default value is ~/Library/Services.' \
+    '--input_methoddir=-:Target location for Input Methods. The default value is ~/Library/Input Methods.' \
+    '--internet_plugindir=-:Target location for Internet Plugins. The default value is ~/Library/Internet Plug-Ins.' \
+    '--audio_unit_plugindir=-:Target location for Audio Unit Plugins. The default value is ~/Library/Audio/Plug-Ins/Components.' \
+    '--vst_plugindir=-:Target location for VST Plugins. The default value is ~/Library/Audio/Plug-Ins/VST.' \
+    '--vst3_plugindir=-:Target location for VST3 Plugins. The default value is ~/Library/Audio/Plug-Ins/VST3.' \
+    '--screen_saverdir=-:Target location for Screen Savers. The default value is ~/Library/Screen Savers.' \
+    '--no-binaries:Do not link "helper" executables to /usr/local/bin.' \
+    '--debug:Output debugging information of use to Cask authors and developers.' \
+    ':command:->command' \
+    '*::options:->options'
+
+  case "$state" in
+  (command)
+    _alternative -C 'brew-cask' \
+      'aliases:alias:__brew_cask_aliases' \
+      'commands:command:__brew_cask_commands' ;;
+  (options)
+    __brew_cask_command "$line[1]" ;;
+  esac
+}
+
+_brew_cask "$@"