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;;; cus-edit.el --- tools for customizing Emacs and Lisp packages
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;;
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;; Copyright (C) 1996, 1997, 1999, 2000, 2001, 2002, 2003, 2004,
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;;   2005, 2006, 2007 Free Software Foundation, Inc.
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;;
;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
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;; Maintainer: FSF
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;; Keywords: help, faces

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;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
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;;; Commentary:
;;
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;; This file implements the code to create and edit customize buffers.
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;;
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;; See `custom.el'.

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;; No commands should have names starting with `custom-' because
;; that interferes with completion.  Use `customize-' for commands
;; that the user will run with M-x, and `Custom-' for interactive commands.

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;; The identity of a customize option is represented by a Lisp symbol.
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;; The following values are associated with an option.
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;; 0. The current value.

;;    This is the value of the option as seen by "the rest of Emacs".

;;    Usually extracted by 'default-value', but can be extracted with
;;    different means if the option symbol has the 'custom-get'
;;    property.  Similarly, set-default (or the 'custom-set' property)
;;    can set it.

;; 1. The widget value.

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;;    This is the value shown in the widget in a customize buffer.
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;; 2. The customized value.

;;    This is the last value given to the option through customize.

;;    It is stored in the 'customized-value' property of the option, in a
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;;    cons-cell whose car evaluates to the customized value.
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;; 3. The saved value.

;;    This is last value saved from customize.

;;    It is stored in the 'saved-value' property of the option, in a
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;;    cons-cell whose car evaluates to the saved value.
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;; 4. The standard value.

;;    This is the value given in the 'defcustom' declaration.

;;    It is stored in the 'standard-value' property of the option, in a
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;;    cons-cell whose car evaluates to the standard value.
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;; 5. The "think" value.
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;;    This is what customize thinks the current value should be.

;;    This is the customized value, if any such value exists, otherwise
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;;    the saved value, if that exists, and as a last resort the standard
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;;    value.
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;; The reason for storing values unevaluated: This is so you can have
;; values that depend on the environment.  For example, you can have a
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;; variable that has one value when Emacs is running under a window
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;; system, and another value on a tty.  Since the evaluation is only done
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;; when the variable is first initialized, this is only relevant for the
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;; saved (and standard) values, but affect others values for
;; compatibility.

;; You can see (and modify and save) this unevaluated value by selecting
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;; "Show Saved Lisp Expression" from the Lisp interface.  This will
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;; give you the unevaluated saved value, if any, otherwise the
;; unevaluated standard value.

;; The possible states for a customize widget are:

;; 0. unknown

;;    The state has not been determined yet.

;; 1. modified

;;    The widget value is different from the current value.

;; 2. changed
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;;    The current value is different from the "think" value.
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;; 3. set

;;    The "think" value is the customized value.

;; 4. saved

;;    The "think" value is the saved value.

;; 5. standard

;;    The "think" value is the standard value.

;; 6. rogue

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;;    There is no standard value.  This means that the variable was
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;;    not defined with defcustom, nor handled in cus-start.el.  Most
;;    standard interactive Custom commands do not let you create a
;;    Custom buffer containing such variables.  However, such Custom
;;    buffers can be created, for instance, by calling
;;    `customize-apropos' with a prefix arg or by calling
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;;    `customize-option' non-interactively.
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;; 7. hidden

;;    There is no widget value.

;; 8. mismatch

;;    The widget value is not valid member of the :type specified for the
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;;    option.
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;;; Code:

(require 'cus-face)
(require 'wid-edit)
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(eval-when-compile
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  (defvar custom-versions-load-alist)	; from cus-load
  (defvar recentf-exclude))		; from recentf.el
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(condition-case nil
    (require 'cus-load)
  (error nil))
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(condition-case nil
    (require 'cus-start)
  (error nil))

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(put 'custom-define-hook 'custom-type 'hook)
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(put 'custom-define-hook 'standard-value '(nil))
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(custom-add-to-group 'customize 'custom-define-hook 'custom-variable)

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;;; Customization Groups.

(defgroup emacs nil
  "Customization of the One True Editor."
  :link '(custom-manual "(emacs)Top"))

;; Most of these groups are stolen from `finder.el',
(defgroup editing nil
  "Basic text editing facilities."
  :group 'emacs)

(defgroup abbrev nil
  "Abbreviation handling, typing shortcuts, macros."
  :tag "Abbreviations"
  :group 'editing)

(defgroup matching nil
  "Various sorts of searching and matching."
  :group 'editing)

(defgroup emulations nil
  "Emulations of other editors."
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  :link '(custom-manual "(emacs)Emulation")
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  :group 'editing)

(defgroup mouse nil
  "Mouse support."
  :group 'editing)

(defgroup outlines nil
  "Support for hierarchical outlining."
  :group 'editing)

(defgroup external nil
  "Interfacing to external utilities."
  :group 'emacs)

(defgroup processes nil
  "Process, subshell, compilation, and job control support."
  :group 'external
  :group 'development)

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(defgroup convenience nil
  "Convenience features for faster editing."
  :group 'emacs)

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(defgroup programming nil
  "Support for programming in other languages."
  :group 'emacs)

(defgroup languages nil
  "Specialized modes for editing programming languages."
  :group 'programming)

(defgroup lisp nil
  "Lisp support, including Emacs Lisp."
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  :link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces)
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  :group 'languages
  :group 'development)

(defgroup c nil
  "Support for the C language and related languages."
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  :link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces)
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  :link '(custom-manual "(ccmode)")
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  :group 'languages)

(defgroup tools nil
  "Programming tools."
  :group 'programming)

(defgroup oop nil
  "Support for object-oriented programming."
  :group 'programming)

(defgroup applications nil
  "Applications written in Emacs."
  :group 'emacs)

(defgroup calendar nil
  "Calendar and time management support."
  :group 'applications)

(defgroup mail nil
  "Modes for electronic-mail handling."
  :group 'applications)

(defgroup news nil
  "Support for netnews reading and posting."
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  :link '(custom-manual "(gnus)")
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  :group 'applications)

(defgroup games nil
  "Games, jokes and amusements."
  :group 'applications)

(defgroup development nil
  "Support for further development of Emacs."
  :group 'emacs)

(defgroup docs nil
  "Support for Emacs documentation."
  :group 'development)

(defgroup extensions nil
  "Emacs Lisp language extensions."
  :group 'development)

(defgroup internal nil
  "Code for Emacs internals, build process, defaults."
  :group 'development)

(defgroup maint nil
  "Maintenance aids for the Emacs development group."
  :tag "Maintenance"
  :group 'development)

(defgroup environment nil
  "Fitting Emacs with its environment."
  :group 'emacs)

(defgroup comm nil
  "Communications, networking, remote access to files."
  :tag "Communication"
  :group 'environment)

(defgroup hardware nil
  "Support for interfacing with exotic hardware."
  :group 'environment)

(defgroup terminals nil
  "Support for terminal types."
  :group 'environment)

(defgroup unix nil
  "Front-ends/assistants for, or emulators of, UNIX features."
  :group 'environment)

(defgroup vms nil
  "Support code for vms."
  :group 'environment)

(defgroup i18n nil
  "Internationalization and alternate character-set support."
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  :link '(custom-manual "(emacs)International")
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  :group 'environment
  :group 'editing)

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(defgroup x nil
  "The X Window system."
  :group 'environment)

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(defgroup frames nil
  "Support for Emacs frames and window systems."
  :group 'environment)

(defgroup data nil
  "Support editing files of data."
  :group 'emacs)

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(defgroup files nil
  "Support editing files."
  :group 'emacs)

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(defgroup wp nil
  "Word processing."
  :group 'emacs)

(defgroup tex nil
  "Code related to the TeX formatter."
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  :link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces)
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  :group 'wp)

(defgroup faces nil
  "Support for multiple fonts."
  :group 'emacs)

(defgroup hypermedia nil
  "Support for links between text or other media types."
  :group 'emacs)

(defgroup help nil
  "Support for on-line help systems."
  :group 'emacs)

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(defgroup multimedia nil
  "Non-textual support, specifically images and sound."
  :group 'emacs)

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(defgroup local nil
  "Code local to your site."
  :group 'emacs)

(defgroup customize '((widgets custom-group))
  "Customization of the Customization support."
  :prefix "custom-"
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  :group 'help)

(defgroup custom-faces nil
  "Faces used by customize."
  :group 'customize
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  :group 'faces)

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(defgroup custom-browse nil
  "Control customize browser."
  :prefix "custom-"
  :group 'customize)

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(defgroup custom-buffer nil
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  "Control customize buffers."
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  :prefix "custom-"
  :group 'customize)

(defgroup custom-menu nil
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  "Control customize menus."
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  :prefix "custom-"
  :group 'customize)

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(defgroup abbrev-mode nil
  "Word abbreviations mode."
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  :link '(custom-manual "(emacs)Abbrevs")
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  :group 'abbrev)

(defgroup alloc nil
  "Storage allocation and gc for GNU Emacs Lisp interpreter."
  :tag "Storage Allocation"
  :group 'internal)

(defgroup undo nil
  "Undoing changes in buffers."
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  :link '(custom-manual "(emacs)Undo")
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  :group 'editing)

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(defgroup mode-line nil
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  "Content of the modeline."
  :group 'environment)

(defgroup editing-basics nil
  "Most basic editing facilities."
  :group 'editing)

(defgroup display nil
  "How characters are displayed in buffers."
  :group 'environment)

(defgroup execute nil
  "Executing external commands."
  :group 'processes)

(defgroup installation nil
  "The Emacs installation."
  :group 'environment)

(defgroup dired nil
  "Directory editing."
  :group 'environment)

(defgroup limits nil
  "Internal Emacs limits."
  :group 'internal)

(defgroup debug nil
  "Debugging Emacs itself."
  :group 'development)

(defgroup minibuffer nil
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  "Controling the behavior of the minibuffer."
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  :link '(custom-manual "(emacs)Minibuffer")
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  :group 'environment)

(defgroup keyboard nil
  "Input from the keyboard."
  :group 'environment)

(defgroup mouse nil
  "Input from the mouse."
  :group 'environment)

(defgroup menu nil
  "Input from the menus."
  :group 'environment)

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(defgroup dnd nil
  "Handling data from drag and drop."
  :group 'environment)

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(defgroup auto-save nil
  "Preventing accidential loss of data."
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  :group 'files)
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(defgroup processes-basics nil
  "Basic stuff dealing with processes."
  :group 'processes)

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(defgroup mule nil
  "MULE Emacs internationalization."
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  :group 'i18n)
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(defgroup windows nil
  "Windows within a frame."
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  :link '(custom-manual "(emacs)Windows")
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  :group 'environment)
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(defgroup mac nil
  "Mac specific features."
  :link '(custom-manual "(emacs)Mac OS")
  :group 'environment
  :version "22.1"
  :prefix "mac-")

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;;; Custom mode keymaps

(defvar custom-mode-map
  ;; This keymap should be dense, but a dense keymap would prevent inheriting
  ;; "\r" bindings from the parent map.
  ;; Actually, this misfeature of dense keymaps was fixed on 2001-11-26.
  (let ((map (make-keymap)))
    (set-keymap-parent map widget-keymap)
    (define-key map [remap self-insert-command] 'Custom-no-edit)
    (define-key map "\^m" 'Custom-newline)
    (define-key map " " 'scroll-up)
    (define-key map "\177" 'scroll-down)
    (define-key map "\C-c\C-c" 'Custom-set)
    (define-key map "\C-x\C-s" 'Custom-save)
    (define-key map "q" 'Custom-buffer-done)
    (define-key map "u" 'Custom-goto-parent)
    (define-key map "n" 'widget-forward)
    (define-key map "p" 'widget-backward)
    map)
  "Keymap for `custom-mode'.")

(defvar custom-mode-link-map
  (let ((map (make-keymap)))
    (set-keymap-parent map custom-mode-map)
    (define-key map [down-mouse-2] nil)
    (define-key map [down-mouse-1] 'mouse-drag-region)
    (define-key map [mouse-2] 'widget-move-and-invoke)
    map)
  "Local keymap for links in `custom-mode'.")


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;;; Utilities.

(defun custom-split-regexp-maybe (regexp)
  "If REGEXP is a string, split it to a list at `\\|'.
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You can get the original back with from the result with:
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  (mapconcat 'identity result \"\\|\")

IF REGEXP is not a string, return it unchanged."
  (if (stringp regexp)
      (let ((start 0)
	    all)
	(while (string-match "\\\\|" regexp start)
	  (setq all (cons (substring regexp start (match-beginning 0)) all)
		start (match-end 0)))
	(nreverse (cons (substring regexp start) all)))
    regexp))

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(defun custom-variable-prompt ()
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  "Prompt for a custom variable, defaulting to the variable at point.
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Return a list suitable for use in `interactive'."
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   (let* ((v (variable-at-point))
	  (default (and (symbolp v) (custom-variable-p v) (symbol-name v)))
	  (enable-recursive-minibuffers t)
	  val)
     (setq val (completing-read
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		(if default (format "Customize variable (default %s): " default)
		  "Customize variable: ")
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		obarray 'custom-variable-p t nil nil default))
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     (list (if (equal val "")
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	       (if (symbolp v) v nil)
	     (intern val)))))
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(defun custom-menu-filter (menu widget)
  "Convert MENU to the form used by `widget-choose'.
MENU should be in the same format as `custom-variable-menu'.
WIDGET is the widget to apply the filter entries of MENU on."
  (let ((result nil)
	current name action filter)
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    (while menu
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      (setq current (car menu)
	    name (nth 0 current)
	    action (nth 1 current)
	    filter (nth 2 current)
	    menu (cdr menu))
      (if (or (null filter) (funcall filter widget))
	  (push (cons name action) result)
	(push name result)))
    (nreverse result)))

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;;; Unlispify.

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(defvar custom-prefix-list nil
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  "List of prefixes that should be ignored by `custom-unlispify'.")
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(defcustom custom-unlispify-menu-entries t
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  "Display menu entries as words instead of symbols if non-nil."
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  :group 'custom-menu
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  :type 'boolean)

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(defcustom custom-unlispify-remove-prefixes nil
  "Non-nil means remove group prefixes from option names in buffer."
  :group 'custom-menu
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  :group 'custom-buffer
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  :type 'boolean)

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(defun custom-unlispify-menu-entry (symbol &optional no-suffix)
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  "Convert SYMBOL into a menu entry."
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  (cond ((not custom-unlispify-menu-entries)
	 (symbol-name symbol))
	((get symbol 'custom-tag)
	 (if no-suffix
	     (get symbol 'custom-tag)
	   (concat (get symbol 'custom-tag) "...")))
	(t
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	 (with-current-buffer (get-buffer-create " *Custom-Work*")
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	   (erase-buffer)
	   (princ symbol (current-buffer))
	   (goto-char (point-min))
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	   ;; FIXME: Boolean variables are not predicates, so they shouldn't
	   ;; end with `-p'.  -stef
	   ;; (when (and (eq (get symbol 'custom-type) 'boolean)
	   ;; 	      (re-search-forward "-p\\'" nil t))
	   ;;   (replace-match "" t t)
	   ;;   (goto-char (point-min)))
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	   (if custom-unlispify-remove-prefixes
	       (let ((prefixes custom-prefix-list)
		     prefix)
		 (while prefixes
		   (setq prefix (car prefixes))
		   (if (search-forward prefix (+ (point) (length prefix)) t)
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		       (progn
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			 (setq prefixes nil)
			 (delete-region (point-min) (point)))
		     (setq prefixes (cdr prefixes))))))
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	   (subst-char-in-region (point-min) (point-max) ?- ?\  t)
	   (capitalize-region (point-min) (point-max))
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	   (unless no-suffix
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	     (goto-char (point-max))
	     (insert "..."))
	   (buffer-string)))))

(defcustom custom-unlispify-tag-names t
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  "Display tag names as words instead of symbols if non-nil."
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  :group 'custom-buffer
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  :type 'boolean)

(defun custom-unlispify-tag-name (symbol)
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  "Convert SYMBOL into a menu entry."
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  (let ((custom-unlispify-menu-entries custom-unlispify-tag-names))
    (custom-unlispify-menu-entry symbol t)))

(defun custom-prefix-add (symbol prefixes)
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  "Add SYMBOL to list of ignored PREFIXES."
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  (cons (or (get symbol 'custom-prefix)
	    (concat (symbol-name symbol) "-"))
	prefixes))

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;;; Guess.

(defcustom custom-guess-name-alist
  '(("-p\\'" boolean)
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    ("-flag\\'" boolean)
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    ("-hook\\'" hook)
    ("-face\\'" face)
    ("-file\\'" file)
    ("-function\\'" function)
    ("-functions\\'" (repeat function))
    ("-list\\'" (repeat sexp))
    ("-alist\\'" (repeat (cons sexp sexp))))
  "Alist of (MATCH TYPE).

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MATCH should be a regexp matching the name of a symbol, and TYPE should
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be a widget suitable for editing the value of that symbol.  The TYPE
of the first entry where MATCH matches the name of the symbol will be
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used.
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This is used for guessing the type of variables not declared with
customize."
  :type '(repeat (group (regexp :tag "Match") (sexp :tag "Type")))
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  :group 'custom-buffer)
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(defcustom custom-guess-doc-alist
  '(("\\`\\*?Non-nil " boolean))
  "Alist of (MATCH TYPE).
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MATCH should be a regexp matching a documentation string, and TYPE
should be a widget suitable for editing the value of a variable with
that documentation string.  The TYPE of the first entry where MATCH
matches the name of the symbol will be used.
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This is used for guessing the type of variables not declared with
customize."
  :type '(repeat (group (regexp :tag "Match") (sexp :tag "Type")))
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  :group 'custom-buffer)
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(defun custom-guess-type (symbol)
  "Guess a widget suitable for editing the value of SYMBOL.
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This is done by matching SYMBOL with `custom-guess-name-alist' and
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if that fails, the doc string with `custom-guess-doc-alist'."
  (let ((name (symbol-name symbol))
	(names custom-guess-name-alist)
	current found)
    (while names
      (setq current (car names)
	    names (cdr names))
      (when (string-match (nth 0 current) name)
	(setq found (nth 1 current)
	      names nil)))
    (unless found
      (let ((doc (documentation-property symbol 'variable-documentation))
	    (docs custom-guess-doc-alist))
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	(when doc
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	  (while docs
	    (setq current (car docs)
		  docs (cdr docs))
	    (when (string-match (nth 0 current) doc)
	      (setq found (nth 1 current)
		    docs nil))))))
    found))
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;;; Sorting.

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;;;###autoload
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(defcustom custom-browse-sort-alphabetically nil
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  "If non-nil, sort customization group alphabetically in `custom-browse'."
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  :type 'boolean
  :group 'custom-browse)

(defcustom custom-browse-order-groups nil
  "If non-nil, order group members within each customization group.
If `first', order groups before non-groups.
If `last', order groups after non-groups."
  :type '(choice (const first)
		 (const last)
		 (const :tag "none" nil))
  :group 'custom-browse)

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(defcustom custom-browse-only-groups nil
  "If non-nil, show group members only within each customization group."
  :type 'boolean
  :group 'custom-browse)

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;;;###autoload
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(defcustom custom-buffer-sort-alphabetically nil
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  "If non-nil, sort each customization group alphabetically in Custom buffer."
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  :type 'boolean
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  :group 'custom-buffer)
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(defcustom custom-buffer-order-groups 'last
  "If non-nil, order group members within each customization group.
If `first', order groups before non-groups.
If `last', order groups after non-groups."
  :type '(choice (const first)
		 (const last)
		 (const :tag "none" nil))
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  :group 'custom-buffer)
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;;;###autoload
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(defcustom custom-menu-sort-alphabetically nil
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  "If non-nil, sort each customization group alphabetically in menus."
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  :type 'boolean
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  :group 'custom-menu)
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(defcustom custom-menu-order-groups 'first
  "If non-nil, order group members within each customization group.
If `first', order groups before non-groups.
If `last', order groups after non-groups."
  :type '(choice (const first)
		 (const last)
		 (const :tag "none" nil))
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  :group 'custom-menu)

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;;;###autoload (add-hook 'same-window-regexps "\\`\\*Customiz.*\\*\\'")

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(defun custom-sort-items (items sort-alphabetically order-groups)
  "Return a sorted copy of ITEMS.
ITEMS should be a `custom-group' property.
If SORT-ALPHABETICALLY non-nil, sort alphabetically.
If ORDER-GROUPS is `first' order groups before non-groups, if `last' order
groups after non-groups, if nil do not order groups at all."
  (sort (copy-sequence items)
   (lambda (a b)
     (let ((typea (nth 1 a)) (typeb (nth 1 b))
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	   (namea (nth 0 a)) (nameb (nth 0 b)))
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       (cond ((not order-groups)
	      ;; Since we don't care about A and B order, maybe sort.
	      (when sort-alphabetically
		(string-lessp namea nameb)))
	     ((eq typea 'custom-group)
	      ;; If B is also a group, maybe sort.  Otherwise, order A and B.
	      (if (eq typeb 'custom-group)
		  (when sort-alphabetically
		    (string-lessp namea nameb))
		(eq order-groups 'first)))
	     ((eq typeb 'custom-group)
	      ;; Since A cannot be a group, order A and B.
	      (eq order-groups 'last))
	     (sort-alphabetically
	      ;; Since A and B cannot be groups, sort.
	      (string-lessp namea nameb)))))))
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;;; Custom Mode Commands.

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(defvar custom-options nil
  "Customization widgets in the current buffer.")

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(defun Custom-set ()
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  "Set the current value of all edited settings in the buffer."
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  (interactive)
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  (let ((children custom-options))
    (if (or (and (= 1 (length children))
		 (memq (widget-type (car children))
		       '(custom-variable custom-face)))
	    (y-or-n-p "Set all values according to this buffer? "))
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	(mapc (lambda (child)
		(when (eq (widget-get child :custom-state) 'modified)
		  (widget-apply child :custom-set)))
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	      children)
      (message "Aborted"))))
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(defun Custom-save ()
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  "Set all edited settings, then save all settings that have been set.
If a setting was edited and set before, this saves it.
If a setting was merely edited before, this sets it then saves it."
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  (interactive)
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  (let ((children custom-options))
    (if (or (and (= 1 (length children))
		 (memq (widget-type (car children))
		       '(custom-variable custom-face)))
	    (yes-or-no-p "Save all settings in this buffer? "))
	(progn
	  (mapc (lambda (child)
		  (when (memq (widget-get child :custom-state)
			      '(modified set changed rogue))
		    (widget-apply child :custom-save)))
		children)
	  (custom-save-all))
      (message "Aborted"))))
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(defvar custom-reset-menu
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  '(("Undo Edits" . Custom-reset-current)
    ("Reset to Saved" . Custom-reset-saved)
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    ("Erase Customization (use standard values)" . Custom-reset-standard))
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  "Alist of actions for the `Reset' button.
The key is a string containing the name of the action, the value is a
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Lisp function taking the widget as an element which will be called
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when the action is chosen.")

(defun custom-reset (event)
  "Select item from reset menu."
  (let* ((completion-ignore-case t)
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	 (answer (widget-choose "Reset settings"
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				custom-reset-menu
				event)))
    (if answer
	(funcall answer))))

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(defun Custom-reset-current (&rest ignore)
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  "Reset all edited settings in the buffer to show their current values."
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  (interactive)
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  (let ((children custom-options))
    (if (or (and (= 1 (length children))
		 (memq (widget-type (car children))
		       '(custom-variable custom-face)))
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	    (y-or-n-p "Reset all settings' buffer text to show current values? "))
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	(mapc (lambda (widget)
		(if (memq (widget-get widget :custom-state)
			  '(modified changed))
		    (widget-apply widget :custom-reset-current)))
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	      children)
      (message "Aborted"))))
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(defun Custom-reset-saved (&rest ignore)
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  "Reset all edited or set settings in the buffer to their saved value.
This also shows the saved values in the buffer."
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  (interactive)
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  (let ((children custom-options))
    (if (or (and (= 1 (length children))
		 (memq (widget-type (car children))
		       '(custom-variable custom-face)))
	    (y-or-n-p "Reset all settings (current values and buffer text) to saved values? "))
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	(mapc (lambda (widget)
		(if (memq (widget-get widget :custom-state)
			  '(modified set changed rogue))
		    (widget-apply widget :custom-reset-saved)))
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	      children)
      (message "Aborted"))))
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(defun Custom-reset-standard (&rest ignore)
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  "Erase all customization (either current or saved) for the group members.
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The immediate result is to restore them to their standard values.
This operation eliminates any saved values for the group members,
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making them as if they had never been customized at all."
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  (interactive)
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  (let ((children custom-options))
    (if (or (and (= 1 (length children))
		 (memq (widget-type (car children))
		       '(custom-variable custom-face)))
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	    (yes-or-no-p "Erase all customizations for settings in this buffer? "))
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	(mapc (lambda (widget)
		(and (if (widget-get widget :custom-standard-value)
			 (widget-apply widget :custom-standard-value)
		       t)
		     (memq (widget-get widget :custom-state)
			   '(modified set changed saved rogue))
		     (widget-apply widget :custom-reset-standard)))
	      children)
      (message "Aborted"))))
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;;; The Customize Commands

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(defun custom-prompt-variable (prompt-var prompt-val &optional comment)
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  "Prompt for a variable and a value and return them as a list.
PROMPT-VAR is the prompt for the variable, and PROMPT-VAL is the
prompt for the value.  The %s escape in PROMPT-VAL is replaced with
the name of the variable.

If the variable has a `variable-interactive' property, that is used as if
it were the arg to `interactive' (which see) to interactively read the value.

If the variable has a `custom-type' property, it must be a widget and the
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`:prompt-value' property of that widget will be used for reading the value.

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If optional COMMENT argument is non-nil, also prompt for a comment and return
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it as the third element in the list."
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  (let* ((var (read-variable prompt-var))
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	 (minibuffer-help-form '(describe-variable var))
	 (val
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	  (let ((prop (get var 'variable-interactive))
		(type (get var 'custom-type))
		(prompt (format prompt-val var)))
	    (unless (listp type)
	      (setq type (list type)))
	    (cond (prop
		   ;; Use VAR's `variable-interactive' property
		   ;; as an interactive spec for prompting.
		   (call-interactively (list 'lambda '(arg)
					     (list 'interactive prop)
					     'arg)))
		  (type
		   (widget-prompt-value type
					prompt
					(if (boundp var)
					    (symbol-value var))
					(not (boundp var))))
		  (t
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		   (eval-minibuffer prompt))))))
    (if comment
 	(list var val
 	      (read-string "Comment: " (get var 'variable-comment)))
      (list var val))))
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;;;###autoload
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(defun customize-set-value (variable value &optional comment)
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  "Set VARIABLE to VALUE, and return VALUE.  VALUE is a Lisp object.
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If VARIABLE has a `variable-interactive' property, that is used as if
it were the arg to `interactive' (which see) to interactively read the value.

If VARIABLE has a `custom-type' property, it must be a widget and the
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`:prompt-value' property of that widget will be used for reading the value.

If given a prefix (or a COMMENT argument), also prompt for a comment."
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  (interactive (custom-prompt-variable "Set variable: "
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				       "Set %s to value: "
				       current-prefix-arg))
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  (cond ((string= comment "")
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 	 (put variable 'variable-comment nil))
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 	(comment
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 	 (put variable 'variable-comment comment)))
  (set variable value))
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;;;###autoload
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(defun customize-set-variable (variable value &optional comment)
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  "Set the default for VARIABLE to VALUE, and return VALUE.
VALUE is a Lisp object.
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If VARIABLE has a `custom-set' property, that is used for setting
VARIABLE, otherwise `set-default' is used.

The `customized-value' property of the VARIABLE will be set to a list
with a quoted VALUE as its sole list member.

If VARIABLE has a `variable-interactive' property, that is used as if
it were the arg to `interactive' (which see) to interactively read the value.

If VARIABLE has a `custom-type' property, it must be a widget and the
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`:prompt-value' property of that widget will be used for reading the value.

If given a prefix (or a COMMENT argument), also prompt for a comment."
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  (interactive (custom-prompt-variable "Set variable: "
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				       "Set customized value for %s to: "
				       current-prefix-arg))
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  (custom-load-symbol variable)
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  (custom-push-theme 'theme-value variable 'user 'set (custom-quote value))
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  (funcall (or (get variable 'custom-set) 'set-default) variable value)
  (put variable 'customized-value (list (custom-quote value)))
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  (cond ((string= comment "")
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 	 (put variable 'variable-comment nil)
 	 (put variable 'customized-variable-comment nil))
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 	(comment
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 	 (put variable 'variable-comment comment)
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 	 (put variable 'customized-variable-comment comment)))
  value)
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;;;###autoload
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(defun customize-save-variable (variable value &optional comment)
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  "Set the default for VARIABLE to VALUE, and save it for future sessions.
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Return VALUE.

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If VARIABLE has a `custom-set' property, that is used for setting
VARIABLE, otherwise `set-default' is used.

The `customized-value' property of the VARIABLE will be set to a list
with a quoted VALUE as its sole list member.

If VARIABLE has a `variable-interactive' property, that is used as if
it were the arg to `interactive' (which see) to interactively read the value.

If VARIABLE has a `custom-type' property, it must be a widget and the
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`:prompt-value' property of that widget will be used for reading the value.

If given a prefix (or a COMMENT argument), also prompt for a comment."
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  (interactive (custom-prompt-variable "Set and save variable: "
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				       "Set and save value for %s as: "
				       current-prefix-arg))
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  (funcall (or (get variable 'custom-set) 'set-default) variable value)
  (put variable 'saved-value (list (custom-quote value)))
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  (custom-push-theme 'theme-value variable 'user 'set (custom-quote value))
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  (cond ((string= comment "")
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 	 (put variable 'variable-comment nil)
 	 (put variable 'saved-variable-comment nil))
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 	(comment
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 	 (put variable 'variable-comment comment)
 	 (put variable 'saved-variable-comment comment)))
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  (custom-save-all)
  value)
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;;;###autoload
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(defun customize ()
  "Select a customization buffer which you can use to set user options.
User options are structured into \"groups\".
Initially the top-level group `Emacs' and its immediate subgroups
are shown; the contents of those subgroups are initially hidden."
  (interactive)
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  (customize-group 'emacs))
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;;;###autoload
(defun customize-mode (mode)
  "Customize options related to the current major mode.
If a prefix \\[universal-argument] was given (or if the current major mode has no known group),
then prompt for the MODE to customize."
  (interactive
   (list
    (let ((completion-regexp-list '("-mode\\'"))
	  (group (custom-group-of-mode major-mode)))
      (if (and group (not current-prefix-arg))
	  major-mode
	(intern
	 (completing-read (if group
			      (format "Major mode (default %s): " major-mode)
			    "Major mode: ")
			  obarray
			  'custom-group-of-mode
			  t nil nil (if group (symbol-name major-mode))))))))
  (customize-group (custom-group-of-mode mode)))


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;;;###autoload
(defun customize-group (group)
  "Customize GROUP, which must be a customization group."
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  (interactive
   (list (let ((completion-ignore-case t))
	   (completing-read "Customize group (default emacs): "
			    obarray
			    (lambda (symbol)
			      (or (and (get symbol 'custom-loads)
				       (not (get symbol 'custom-autoload)))
				  (get symbol 'custom-group)))
			    t))))
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  (when (stringp group)
    (if (string-equal "" group)
	(setq group 'emacs)
      (setq group (intern group))))
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  (let ((name (format "*Customize Group: %s*"
		      (custom-unlispify-tag-name group))))
    (if (get-buffer name)
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	(pop-to-buffer name)
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      (custom-buffer-create (list (list group 'custom-group))
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			    name
			    (concat " for group "
				    (custom-unlispify-tag-name group))))))
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;;;###autoload
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(defun customize-group-other-window (group)
  "Customize GROUP, which must be a customization group."
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  (interactive
   (list (let ((completion-ignore-case t))
	   (completing-read "Customize group (default emacs): "
			    obarray
			    (lambda (symbol)
			      (or (and (get symbol 'custom-loads)
				       (not (get symbol 'custom-autoload)))
				  (get symbol 'custom-group)))
			    t))))
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  (when (stringp group)
    (if (string-equal "" group)
	(setq group 'emacs)
      (setq group (intern group))))
  (let ((name (format "*Customize Group: %s*"
		      (custom-unlispify-tag-name group))))
    (if (get-buffer name)
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	(let (
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	      ;; Copied from `custom-buffer-create-other-window'.
	      (pop-up-windows t)
	      (same-window-buffer-names nil)
	      (same-window-regexps nil))
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	  (pop-to-buffer name))
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      (custom-buffer-create-other-window
       (list (list group 'custom-group))
       name
       (concat " for group "
	       (custom-unlispify-tag-name group))))))
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;;;###autoload
(defalias 'customize-variable 'customize-option)
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;;;###autoload
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(defun customize-option (symbol)
  "Customize SYMBOL, which must be a user option variable."
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  (interactive (custom-variable-prompt))
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  (unless symbol
    (error "No variable specified"))
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  (let ((basevar (indirect-variable symbol)))
    (custom-buffer-create (list (list basevar 'custom-variable))
			  (format "*Customize Option: %s*"
				  (custom-unlispify-tag-name basevar)))
    (unless (eq symbol basevar)
      (message "`%s' is an alias for `%s'" symbol basevar))))
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;;;###autoload
(defalias 'customize-variable-other-window 'customize-option-other-window)

;;;###autoload
(defun customize-option-other-window (symbol)
  "Customize SYMBOL, which must be a user option variable.
Show the buffer in another window, but don't select it."
  (interactive (custom-variable-prompt))
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  (unless symbol
    (error "No variable specified"))
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  (let ((basevar (indirect-variable symbol)))
    (custom-buffer-create-other-window
     (list (list basevar 'custom-variable))
     (format "*Customize Option: %s*" (custom-unlispify-tag-name basevar)))
    (unless (eq symbol basevar)
      (message "`%s' is an alias for `%s'" symbol basevar))))
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(defvar customize-changed-options-previous-release "21.1"
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  "Version for `customize-changed-options' to refer back to by default.")