#compdef brew
 
 # copied from _fink
 
 _brew_all_formulae() {
   formulae=(`brew search`)
 }
 
 _brew_installed_formulae() {
   installed_formulae=(`brew list`)
 }
 
 local -a _1st_arguments
 _1st_arguments=(
   'install:install a formula'
   'remove:remove a formula'
   'search:search for a formula (/regex/ or string)'
   'list:list files in a formula or not-installed formulae'
   'link:link a formula'
   'unlink:unlink a formula'
   'home:visit the homepage of a formula or the brew project'
   'info:information about a formula'
   'prune:remove dead links'
   'update:freshen up links'
   'log:git commit log for a formula'
   'create:create a new formula'
   'edit:edit a formula'
 )
 
 local expl
 local -a formula installed_formulae
 
 _arguments \
   '(-v --verbose)'{-v,--verbose}'[verbose]' \
   '(--version)--version[version information]' \
   '(--prefix)--prefix[where brew lives on this system]' \
   '(--cache)--cache[brew cache]' \
   '*:: :->subcmds' && return 0
 
 if (( CURRENT == 1 )); then
   _describe -t commands "brew subcommand" _1st_arguments
   return
 fi
 
 case "$words[1]" in
   list)
     _arguments \
       '(--unbrewed)--unbrewed[files in brew --prefix not controlled by brew]' \
       '1: :->forms' &&  return 0
       
       if [[ "$state" == forms ]]; then
         _brew_installed_formulae
         _requested installed_formulae expl 'installed formulae' compadd -a installed_formulae
       fi ;;
   install|home|log|info)
     _brew_all_formulae
     _wanted formulae expl 'all formulae' compadd -a formulae ;;
   remove|edit|xo)
     _brew_installed_formulae
     _wanted installed_formulae expl 'installed formulae' compadd -a installed_formulae ;;
 esac