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#compdef -K _history-complete-older complete-word \e/ _history-complete-newer complete-word \e,
#
# Complete words from the history
#
# by Adam Spiers, with help gratefully received from
# Sven Wischnowsky and Bart Schaefer
#
# Available styles:
#
#   list --  avoid to display lists of available matches
#   stop --  stop before looping at beginning and end of matches
#   sort --  sort matches lexically (default is to sort by age)
#   remove-all-dups --
#            remove /all/ duplicate matches rather than just consecutives
#   range -- range of history words to complete

_history_complete_word () {
  eval "$_comp_setup"

  local expl direction stop curcontext="$curcontext"

  if [[ -z "$curcontext" ]]; then
    curcontext=history-words:::
  else
    curcontext="history-words${curcontext#*:}"
  fi

  if [[ $WIDGET = *newer ]]; then
    direction=newer
  else
    direction=older
  fi

  zstyle -t ":completion:${curcontext}:history-words" stop && stop=yes

  zstyle -T ":completion:${curcontext}:history-words" list || compstate[list]=''

  if [[ $LASTWIDGET = _history-complete-* &&
        ( -n "$compstate[old_list]" || -n $_hist_stop ) ]]; then
    if [[ "$direction" == older ]]; then
      if [[ $_hist_stop = new ]]; then
        PREFIX=$_hist_old_prefix
        _history_complete_word_gen_matches
        compstate[insert]=2
        _hist_stop=
      elif [[ $_hist_stop = old ]]; then
        PREFIX=$_hist_old_prefix
        _history_complete_word_gen_matches
        compstate[insert]=1
        _hist_stop=
      elif [[ compstate[old_insert] -lt _hist_menu_length ]]; then
        compstate[old_list]=keep
        (( compstate[insert] = compstate[old_insert] + 1 ))
      elif [[ -n $stop ]]; then
        _hist_stop=old
        _message 'beginning of history reached'
        return 1
      else
        compstate[old_list]=keep
        compstate[insert]=1
      fi
    elif [[ "$direction" == 'newer' ]]; then
      if [[ $_hist_stop = old ]]; then
        PREFIX=$_hist_old_prefix
        _history_complete_word_gen_matches
        compstate[insert]=$(( $compstate[nmatches] - 1 ))
        _hist_stop=
      elif [[ $_hist_stop = new ]]; then
        PREFIX=$_hist_old_prefix
        _history_complete_word_gen_matches
        compstate[insert]=$compstate[nmatches]
        _hist_stop=
      elif [[ compstate[old_insert] -gt 1 ]]; then
        compstate[old_list]=keep
        (( compstate[insert] = compstate[old_insert] - 1 ))
      elif [[ -n $stop ]]; then
        _hist_stop=new
        _message 'end of history reached'
        return 1
      else
        compstate[old_list]=keep
        compstate[insert]=$_hist_menu_length
      fi
    fi
    return 0
  else
    _hist_stop=
    _hist_old_prefix="$PREFIX"
    _history_complete_word_gen_matches
  fi

  (( $compstate[nmatches] ))
}

_history_complete_word_gen_matches () {

  [[ -n "$_hist_stop" ]] && PREFIX="$_hist_old_prefix"

  _main_complete _history

  zstyle -T ":completion:${curcontext}:history-words" list || compstate[list]=

  _hist_menu_length="$compstate[nmatches]"

  if [[ $_lastcomp[insert] != *unambig* ]]; then
    case "$direction" in 
      newer)  compstate[insert]=$_hist_menu_length
	      [[ -n "$_hist_stop" ]] && (( compstate[insert]-- ))
              ;;
      older)  compstate[insert]=1
	      [[ -n "$_hist_stop" ]] && (( compstate[insert]++ ))
              ;;
    esac
  fi

  _hist_stop=

  return
}

_history_complete_word "$@"

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