## completion system
  zstyle ':completion:*:approximate:'    max-errors 'reply=( $((($#PREFIX+$#SUFFIX)/3 )) numeric )' # allow one error for every three characters typed in approximate completer
  zstyle ':completion:*:complete:-command-::commands' ignored-patterns '*\~' # don't complete backup files as executables
  zstyle ':completion:*:correct:*'       insert-unambiguous true             # start menu completion only if it could find no unambiguous initial string
  zstyle ':completion:*:corrections'     format $'%{\e[0;31m%}%d (errors: %e)%{\e[0m%}' #
  zstyle ':completion:*:correct:*'       original true                       #
  zstyle ':completion:*:default'         list-colors ${(s.:.)LS_COLORS}      # activate color-completion(!)
  zstyle ':completion:*:descriptions'    format $'%{\e[0;31m%}completing %B%d%b%{\e[0m%}'  # format on completion
  zstyle ':completion:*:*:cd:*:directory-stack' menu yes select              # complete 'cd -<tab>' with menu
  zstyle ':completion:*:expand:*'        tag-order all-expansions            # insert all expansions for expand completer
  zstyle ':completion:*:history-words'   list false                          #
  zstyle ':completion:*:history-words'   menu yes                            # activate menu
  zstyle ':completion:*:history-words'   remove-all-dups yes                 # ignore duplicate entries
  zstyle ':completion:*:history-words'   stop yes                            #
  zstyle ':completion:*'                 matcher-list 'm:{a-z}={A-Z}'        # match uppercase from lowercase
  zstyle ':completion:*:matches'         group 'yes'                         # separate matches into groups
  zstyle ':completion:*'                 group-name ''
  if [[ -z "$NOMENU" ]] ; then
    zstyle ':completion:*'               menu select=5                       # if there are more than 5 options allow selecting from a menu
  else
    setopt no_auto_menu # don't use any menus at all
  fi
  zstyle ':completion:*:messages'        format '%d'                         #
  zstyle ':completion:*:options'         auto-description '%d'               #
  zstyle ':completion:*:options'         description 'yes'                   # describe options in full
  zstyle ':completion:*:processes'       command 'ps -au$USER'               # on processes completion complete all user processes
  zstyle ':completion:*:*:-subscript-:*' tag-order indexes parameters        # offer indexes before parameters in subscripts
  zstyle ':completion:*'                 verbose true                        # provide verbose completion information
  zstyle ':completion:*:warnings'        format $'%{\e[0;31m%}No matches for:%{\e[0m%} %d' # set format for warnings
  zstyle ':completion:*:*:zcompile:*'    ignored-patterns '(*~|*.zwc)'       # define files to ignore for zcompile
  zstyle ':completion:correct:'          prompt 'correct to: %e'             #
  zstyle ':completion::(^approximate*):*:functions' ignored-patterns '_*'    # Ignore completion functions for commands you don't have:

# complete manual by their section
  zstyle ':completion:*:manuals'    separate-sections true
  zstyle ':completion:*:manuals.*'  insert-sections   true
  zstyle ':completion:*:man:*'      menu yes select

## correction
# run rehash on completion so new installed program are found automatically:
  _force_rehash() {
      (( CURRENT == 1 )) && rehash
         return 1 # Because we didn't really complete anything
    }
# some people don't like the automatic correction - so run 'NOCOR=1 zsh' to deactivate it
  if [[ -n "$NOCOR" ]] ; then
    zstyle ':completion:*' completer _oldlist _expand _force_rehash _complete _files
    setopt nocorrect # do not try to correct the spelling if possible
  else
#    zstyle ':completion:*' completer _oldlist _expand _force_rehash _complete _correct _approximate _files
    setopt correct  # try to correct the spelling if possible
    zstyle -e ':completion:*' completer '
        if [[ $_last_try != "$HISTNO$BUFFER$CURSOR" ]]; then
          _last_try="$HISTNO$BUFFER$CURSOR"
          reply=(_complete _match _prefix _files)
        else
          if [[ $words[1] = (rm|mv) ]]; then
            reply=(_complete _files)
          else
            reply=(_oldlist _expand _force_rehash _complete _correct _approximate _files)
          fi
        fi'
  fi
# zstyle ':completion:*' completer _complete _correct _approximate
# zstyle ':completion:*' expand prefix suffix

# automatic rehash? Credits go to Frank Terbeck
# function my_accept () {
#   local buf
#   [[ -z ${BUFFER} ]] && zle accept-line && return
#   buf=( ${(z)BUFFER}  )
#   [[ -z ${commands[${buf[1]}]} ]] && rehash
#   zle accept-line
# }
# zle -N my_accept
# bindkey "^M" my_accept

# command for process lists, the local web server details and host completion
  zstyle ':completion:*:urls' local 'www' '/var/www/' 'public_html'
  
  # caching
  [ -d $ZSHDIR/cache ] && zstyle ':completion:*' use-cache yes && \
                          zstyle ':completion::complete:*' cache-path $ZSHDIR/cache/

# host completion /* add brackets as vim can't parse zsh's complex cmdlines 8-) {{{ */
    [ -r ~/.ssh/known_hosts ] && _ssh_hosts=(${${${${(f)"$(<$HOME/.ssh/known_hosts)"}:#[\|]*}%%\ *}%%,*}) || _ssh_hosts=()
    [ -r /etc/hosts ] && : ${(A)_etc_hosts:=${(s: :)${(ps:\t:)${${(f)~~"$(</etc/hosts)"}%%\#*}##[:blank:]#[^[:blank:]]#}}} || _etc_hosts=()
  hosts=(
      `hostname`
      "$_ssh_hosts[@]"
      "$_etc_hosts[@]"
      grml.org
      localhost
  )
  zstyle ':completion:*:hosts' hosts $hosts
#  zstyle '*' hosts $hosts