#compdef port
  
  local subcmds 
  
  # we cache the list of ports
  # we shall use some cache policy to avoid problems with new ports
  if (( ! $+portlist )); then
  	portlist=($(port echo all; echo "all current active inactive installed uninstalled outdated"))
  fi
  
  subcmds=(
  'activate'
  'archive'
  'build'
  'cat'
  'clean'
  'configure'
  'contents'
  'deactivate'
  'dependents'
  'deps'
  'destroot'
  'dir'
  'distcheck'
  'distclean'
  'dmg'
  'echo'
  'edit'
  'extract'
  'fetch'
  'file'
  'help'
  'info'
  'install' 
  'installed' 
  'list'
  'livecheck'
  'location'
  'mpkg'
  'outdated'
  'patch'
  'pkg'
  'provides'
  'rpmpackage'
  'search'
  'selfupdate'
  'sync'
  'test'
  'unarchive'
  'uninstall'
  'upgrade' 
  'variants'
  'version'
  )
  
  _arguments -C \
  '-v[verbose mode (generate verbose messages)]' \
  '-d[debug mode (generate debugging messages)]' \
  '-q[quiet mode (suppress messages)]' \
  '-D[specify portdir]' \
  '-k[keep mode (do not autoclean after install)]' \
  '-n[dont follow dependencies in upgrade (only for upgrading)]' \
  '-a[upgrade all installed ports (only for upgrading)]' \
  '-u[uninstall non-active ports when upgrading and uninstalling]' \
  '-f[force mode (ignore state file)]' \
  '-s[source-only mode]' \
  '-b[binary-only mode]' \
  '-o[honor state files older than Portfile]' \
  '*::command:->command' \
  && return 0
  
  case $state in
  	command)
  	if ((CURRENT == 1)); then
  		state=subcommands
  	else
  		state=portname
  	fi
  	;;
  esac
  
  case $state in
  	subcommands)
  	_describe -t commands 'port commands' subcmds
  	;;
  	portname)
  	_describe -t commands 'available ports' portlist
  	;;
  esac