zsh/Completion/Builtins/_zstyle

#compdef zstyle

local curcontext="$curcontext" state ostate line expl ctop
local nm=$compstat[nmatches]

typeset -A styles
# Assoc array of styles; the values give the possible top-level
# contexts (currently c for completion, z for zftp or cz for both),
# followed by a colon, followed by a state to enter, empty if none.
styles=(
  accept-exact		 c:bool
  arguments		 c:
  auto-description	 c:
  cache-path		 'c:_path_files -/'
  completer		 c:completer
  completions		 c:
  condition		 c:
  cursor		 c:bool
  disable-stat		 c:bool
  expand		 c:
  format		 c:
  glob			 c:
  group-name		 c:
  group-order		 c:tag
  groups		 c:_groups
  hidden		 c:bool
  hosts			 c:_hosts
  hosts-ports		 c:host-port
  hosts-ports-users	 c:host-port-user
  ignored-suffixes	 c:
  insert-unambiguous	 c:bool
  last-prompt		 c:bool
  list			 c:listwhen
  list-arguments	 c:
  list-colors		 c:
  list-packed		 c:bool
  list-rows-first	 c:bool
  local			 c:
  max-errors		 c:
  menu			 c:boolauto
  numbers		 c:bool
  original		 c:bool
  path			 'c:_path_files -/'
  ports			 c:_ports
  prefix-hidden		 c:bool
  prefix-needed		 c:bool
  prompt		 c:
  remove-all-dups	 c:bool
  sort			 c:bool
  tag-order		 c:tag
  special-dirs		 c:sdirs
  stop			 c:stop
  substitute		 c:
  users			 c:_users
  users-hosts		 c:user-host
  verbose		 c:bool
  word			 c:bool

  chpwd			 z:bool
  progress		 z:progress
  remote_glob		 z:bool
  titlebar		 z:bool
  update		 z:
)

local taglist
taglist=(accounts all-files all-expansions arguments arrays
association-keys bookmarks builtins characters colors commands corrections
cursors cvs default descriptions devices directories directory-stack
displays expansions extensions files fonts functions globbed-files groups
history-words hosts indexes jobs keymaps keysyms local-directories
libraries limits manuals maps messages modifiers modules my-accounts
named-directories names nicknames options original other-accounts packages
parameters path-directories paths pods ports prefixes processes ps regex
sequences sessions signals strings tags targets types urls users values
warnings widgets windows zsh-options)

_arguments ':context:->contexts' ':style:->styles' '*:argument:->style-arg'

while [[ -n $state ]]; do
  ostate=$state
  state=

  case "$ostate" in
    contexts)
      if [[ $PREFIX != :*: ]]; then
	_wanted contexts expl context &&
	compadd -P : -S : "$expl[@]" completion zftp
      fi
      ;;

    styles)
      # Get the top-level context we're completing for, if any.
      if [[ $words[2] = :(completion|zftp):* ]]; then
	ctop=${words[2][2]}
      else
        ctop=cz
      fi
      _wanted styles expl style &&
         compadd "$expl[@]" - ${(k)styles[(R)[^:]#[$ctop][^:]#:*]}
      ;;
      
    style-arg)
      state="${styles[$words[3]]#*:}"
      ;;

    bool) 
      _wanted values expl boolean &&
	compadd "$expl[@]" true false
      ;;

    boolauto) 
      _wanted values expl boolean &&
	compadd "$expl[@]" true false auto select
      ;;

    completer)
      _wanted values expl completer &&
	compadd "$expl[@]" _complete _approximate _correct _match \
          _expand _list _menu _oldlist
      ;;

    host-port*)
      if [[ $PREFIX != *:* ]]; then
	_hosts -S :
      elif [[ $ostate != *user || $PREFIX != *:*:* ]]; then
	compset -P 1 '*:'
	_ports
      else
	compset -P 2 '*:'
        _users
      fi
      ;;

    listwhen)
      _wanted values expl 'when to list completions' &&
	compadd "$expl[@]" always never sometimes
      ;;

    progress)
      _wanted values expl 'progress meter style' &&
        compadd "$expl[@]" none bar percent
      ;;

    sdirs)
      _wanted values expl 'whether to complete . or ..' &&
        compadd "$expl[@]" true false ..
      ;;

    stop)
      _wanted values expl 'when to insert matches' &&
	compadd "$expl[@]" true false verbose
      ;;

    tag)
      _wanted tags expl tag && compadd "$expl[@]" - $taglist
      ;;

    user-host)
      if [[ $PREFIX = *:* ]]; then
	compset -P '*:'
	_hosts
      else
	_users
      fi
      ;;

    _*)
      ${=ostate}
      ;;

    *)
      ;;
  esac
done

[[ $compstate[nmatches] != $nm ]]