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;;; cus-edit.el --- tools for customizing Emacs and Lisp packages
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;;
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;; Copyright (C) 1996,97,1999,2000,01,02,03,2004  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
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, 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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;;; Code:

(require 'cus-face)
(require 'wid-edit)
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(eval-when-compile
  (defvar custom-versions-load-alist))	; from cus-load
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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."
  :group 'languages
  :group 'development)

(defgroup c nil
  "Support for the C language and related languages."
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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."
  :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)

(defgroup modeline nil
  "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
  "Controling the behaviour 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)

(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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;;; Utilities.

(defun custom-quote (sexp)
  "Quote SEXP iff it is not self quoting."
  (if (or (memq sexp '(t nil))
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	  (keywordp sexp)
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	  (and (listp sexp)
	       (memq (car sexp) '(lambda)))
	  (stringp sexp)
	  (numberp sexp)
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	  (vectorp sexp)
;;;  	  (and (fboundp 'characterp)
;;;  	       (characterp sexp))
	  )
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      sexp
    (list 'quote sexp)))

(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'."
   (let ((v (variable-at-point))
	 (enable-recursive-minibuffers t)
	 val)
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     (setq val (completing-read
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		(if (and (symbolp v) (custom-variable-p v))
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		    (format "Customize option: (default %s) " v)
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		  "Customize option: ")
		obarray 'custom-variable-p t))
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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
  "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
  "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)
    ("-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 'customize)

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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")))
  :group 'customize)
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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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(defcustom custom-browse-sort-alphabetically nil
  "If non-nil, sort members of each customization group alphabetically."
  :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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(defcustom custom-buffer-sort-alphabetically nil
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  "If non-nil, sort members of each customization group alphabetically."
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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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(defcustom custom-menu-sort-alphabetically nil
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  "If non-nil, sort members of each customization group alphabetically."
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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 changes in all modified options."
  (interactive)
  (let ((children custom-options))
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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)))

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(defun Custom-save ()
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  "Set all modified group members and save them."
  (interactive)
  (let ((children custom-options))
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    (mapc (lambda (child)
	    (when (memq (widget-get child :custom-state)
			'(modified set changed rogue))
	      (widget-apply child :custom-save)))
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	    children))
  (custom-save-all))

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(defvar custom-reset-menu
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  '(("Current" . Custom-reset-current)
    ("Saved" . Custom-reset-saved)
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    ("Erase Customization (use standard settings)" . 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)
	 (answer (widget-choose "Reset to"
				custom-reset-menu
				event)))
    (if answer
	(funcall answer))))

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(defun Custom-reset-current (&rest ignore)
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  "Reset all modified group members to their current value."
  (interactive)
  (let ((children custom-options))
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    (mapc (lambda (widget)
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	    (if (memq (widget-get widget :custom-state)
		      '(modified changed))
		(widget-apply widget :custom-reset-current)))
	  children)))
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(defun Custom-reset-saved (&rest ignore)
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  "Reset all modified or set group members to their saved value."
  (interactive)
  (let ((children custom-options))
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    (mapc (lambda (widget)
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	    (if (memq (widget-get widget :custom-state)
		      '(modified set changed rogue))
		(widget-apply widget :custom-reset-saved)))
	  children)))
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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.
The immediate result is to restore them to their standard settings.
This operation eliminates any saved settings for the group members,
making them as if they had never been customized at all."
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  (interactive)
  (let ((children custom-options))
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    (mapc (lambda (widget)
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	    (and (widget-apply widget :custom-standard-value)
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		 (if (memq (widget-get widget :custom-state)
			   '(modified set changed saved rogue))
		     (widget-apply widget :custom-reset-standard))))
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	    children)))

;;; 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.

If optional COMMENT argument is non nil, also prompt for a comment and return
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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  (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 (list (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) "
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					obarray
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					(lambda (symbol)
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					  (or (get symbol 'custom-loads)
					      (get symbol 'custom-group)))
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					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."
  (interactive (list (let ((completion-ignore-case t))
		       (completing-read "Customize group: (default emacs) "
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					obarray
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					(lambda (symbol)
					  (or (get symbol 'custom-loads)
					      (get symbol 'custom-group)))
					t))))
  (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)
	      (special-display-buffer-names nil)
	      (special-display-regexps nil)
	      (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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  (custom-buffer-create (list (list symbol 'custom-variable))
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			(format "*Customize Option: %s*"
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				(custom-unlispify-tag-name symbol))))
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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))
  (custom-buffer-create-other-window
   (list (list symbol 'custom-variable))
   (format "*Customize Option: %s*" (custom-unlispify-tag-name symbol))))

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(defvar customize-changed-options-previous-release "20.2"
  "Version for `customize-changed-options' to refer back to by default.")

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;;;###autoload
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(defun customize-changed-options (since-version)
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  "Customize all user option variables changed in Emacs itself.
This includes new user option variables and faces, and new
customization groups, as well as older options and faces whose default
values have changed since the previous major Emacs release.

With argument SINCE-VERSION (a string), customize all user option
variables that were added (or their meanings were changed) since that
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version."
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  (interactive "sCustomize options changed, since version (default all versions): ")
  (if (equal since-version "")
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      (setq since-version nil)
    (unless (condition-case nil
		(numberp (read since-version))
	      (error nil))
      (signal 'wrong-type-argument (list 'numberp since-version))))
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  (unless since-version
    (setq since-version customize-changed-options-previous-release))
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  ;; Load the information for versions since since-version.  We use
  ;; custom-load-symbol for this.
  (put 'custom-versions-load-alist 'custom-loads nil)
  (dolist (elt custom-versions-load-alist)
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    (if (customize-version-lessp since-version (car elt))
	(dolist (load (cdr elt))
	  (custom-add-load 'custom-versions-load-alist load))))
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  (custom-load-symbol 'custom-versions-load-alist)
  (put 'custom-versions-load-alist 'custom-loads nil)

  (let (found)
    (mapatoms
     (lambda (symbol)
       (let ((version (get symbol 'custom-version)))
	 (if version
	     (when (customize-version-lessp since-version version)
	       (if (or (get symbol 'custom-group)
		       (get symbol 'group-documentation))
		   (push (list symbol 'custom-group) found))
	       (if (custom-variable-p symbol)
		   (push (list symbol 'custom-variable) found))
	       (if (custom-facep symbol)
		   (push (list symbol 'custom-face) found)))))))
    (if found
	(custom-buffer-create (custom-sort-items found t 'first)
			      "*Customize Changed Options*")
      (error "No user option defaults have been changed since Emacs %s"
	     since-version))))
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(defun customize-version-lessp (version1 version2)
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  ;; Why are the versions strings, and given that they are, why aren't
  ;; they converted to numbers and compared as such here?  -- fx

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  ;; In case someone made a mistake and left out the quotes
  ;; in the :version value.
  (if (numberp version2)
      (setq version2 (prin1-to-string version2)))
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  (let (major1 major2 minor1 minor2)
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    (string-match "\\([0-9]+\\)\\(\\.\\([0-9]+\\)\\)?" version1)
    (setq major1 (read (or (match-string 1 version1)
			   "0")))
    (setq minor1 (read (or (match-string 3 version1)
			   "0")))
    (string-match "\\([0-9]+\\)\\(\\.\\([0-9]+\\)\\)?" version2)
    (setq major2 (read (or (match-string 1 version2)
			   "0")))
    (setq minor2 (read (or (match-string 3 version2)
			   "0")))
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    (or (< major1 major2)
	(and (= major1 major2)
	     (< minor1 minor2)))))
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;;;###autoload
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(defun customize-face (&optional face)
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  "Customize FACE, which should be a face name or nil.
If FACE is nil, customize all faces.
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Interactively, when point is on text which has a face specified,
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suggest to customize that face, if it's customizable."
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  (interactive
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   (list (read-face-name "Customize face" "all faces" t)))
  (if (member face '(nil ""))
      (setq face (face-list)))
  (if (and (listp face) (null (cdr face)))
      (setq face (car face)))
  (if (listp face)
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      (custom-buffer-create (custom-sort-items
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			     (mapcar (lambda (s)
				       (list s 'custom-face))
				     face)
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			     t nil)
			    "*Customize Faces*")
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    (unless (facep face)
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      (error "Invalid face %S" face))
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    (custom-buffer-create (list (list face 'custom-face))
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			  (format "*Customize Face: %s*"
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				  (custom-unlispify-tag-name face)))))
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;;;###autoload
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(defun customize-face-other-window (&optional face)
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  "Show customization buffer for face FACE in other window.
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Interactively, when point is on text which has a face specified,
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suggest to customize that face, if it's customizable."
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  (interactive
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   (list (read-face-name "Customize face" "all faces" t)))
  (if (member face '(nil ""))
      (setq face (face-list)))
  (if (and (listp face) (null (cdr face)))
      (setq face (car face)))
  (if (listp face)
      (custom-buffer-create-other-window
       (custom-sort-items
	(mapcar (lambda (s)
		  (list s 'custom-face))
		face)
	t nil)
       "*Customize Faces*")
    (unless (facep face)
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      (error "Invalid face %S" face))
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    (custom-buffer-create-other-window
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     (list (list face 'custom-face))
     (format "*Customize Face: %s*"
	     (custom-unlispify-tag-name face)))))
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;;;###autoload
(defun customize-customized ()
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  "Customize all user options set since the last save in this session."
  (interactive)
  (let ((found nil))
    (mapatoms (lambda (symbol)
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		(and (or (get symbol 'customized-face)
			 (get symbol 'customized-face-comment))
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		     (custom-facep symbol)
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		     (push (list symbol 'custom-face) found))
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		(and (or (get symbol 'customized-value)
			 (get symbol 'customized-variable-comment))
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		     (boundp symbol)
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		     (push (list symbol 'custom-variable) found))))
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    (if (not found)
	(error "No customized user options")
      (custom-buffer-create (custom-sort-items found t nil)
			    "*Customize Customized*"))))
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;;;###autoload
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(defun customize-rogue ()
  "Customize all user variable modified outside customize."
  (interactive)
  (let ((found nil))
    (mapatoms (lambda (symbol)
		(let ((cval (or (get symbol 'customized-value)
				(get symbol 'saved-value)
				(get symbol 'standard-value))))
		  (when (and cval 	;Declared with defcustom.
			     (default-boundp symbol) ;Has a value.
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			     (not (equal (eval (car cval))
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					 ;; Which does not match customize.
					 (default-value symbol))))
		    (push (list symbol 'custom-variable) found)))))
    (if (not found)
	(error "No rogue user options")
      (custom-buffer-create (custom-sort-items found t nil)
			    "*Customize Rogue*"))))
;;;###autoload
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(defun customize-saved ()
  "Customize all already saved user options."
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  (interactive)
  (let ((found nil))
    (mapatoms (lambda (symbol)
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		(and (or (get symbol 'saved-face)
			 (get symbol 'saved-face-comment))
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		     (custom-facep symbol)
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		     (push (list symbol 'custom-face) found))
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		(and (or (get symbol 'saved-value)
			 (get symbol 'saved-variable-comment))