#compdef gem
 #autoload
 
 # gem zsh completion, based on homebrew completion
 
 _gem_installed() {
   installed_gems=(`gem list --local --no-versions`)
 }
 
 local -a _1st_arguments
 _1st_arguments=(
   'cert:Manage RubyGems certificates and signing settings'
   'check:Check installed gems'
   'cleanup:Clean up old versions of installed gems in the local repository'
   'contents:Display the contents of the installed gems'
   'dependency:Show the dependencies of an installed gem'
   'environment:Display information about the RubyGems environment'
   'fetch:Download a gem and place it in the current directory'
   'generate_index:Generates the index files for a gem server directory'
   'help:Provide help on the `gem` command'
   'install:Install a gem into the local repository'
   'list:Display gems whose name starts with STRING'
   'lock:Generate a lockdown list of gems'
   'mirror:Mirror a gem repository'
   'outdated:Display all gems that need updates'
   'owner:Manage gem owners on RubyGems.org.'
   'pristine:Restores installed gems to pristine condition from files located in the gem cache'
   'push:Push a gem up to RubyGems.org'
   'query:Query gem information in local or remote repositories'
   'rdoc:Generates RDoc for pre-installed gems'
   'search:Display all gems whose name contains STRING'
   'server:Documentation and gem repository HTTP server'
   'sources:Manage the sources and cache file RubyGems uses to search for gems'
   'specification:Display gem specification (in yaml)'
   'stale:List gems along with access times'
   'uninstall:Uninstall gems from the local repository'
   'unpack:Unpack an installed gem to the current directory'
   'update:Update the named gems (or all installed gems) in the local repository'
   'which:Find the location of a library file you can require'
 )
 
 local expl
 local -a gems installed_gems
 
 _arguments \
   '(-v --version)'{-v,--version}'[show version]' \
   '(-h --help)'{-h,--help}'[show help]' \
   '*:: :->subcmds' && return 0
 
 if (( CURRENT == 1 )); then
   _describe -t commands "gem subcommand" _1st_arguments
   return
 fi
 
 case "$words[1]" in
   list)
       if [[ "$state" == forms ]]; then
         _gem_installed
         _requested installed_gems expl 'installed gems' compadd -a installed_gems
       fi ;;
   uninstall|update)
     _gem_installed
     _wanted installed_gems expl 'installed gems' compadd -a installed_gems ;;
 esac