xemacs-beta: lisp/custom/wid-edit.el comparison

comparison lisp/custom/wid-edit.el @ 28:1917ad0d78d7 r19-15b97

Import from CVS: tag r19-15b97

author	cvs
date	Mon, 13 Aug 2007 08:51:55 +0200
parents
children	ec9a17fef872

comparison

equal deleted inserted replaced

-:0a3286277d9b
+:1917ad0d78d7
+;;; wid-edit.el --- Functions for creating and using widgets.
+;;
+;; Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+;;
+;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
+;; Keywords: extensions
+;; Version: 1.50
+;; X-URL: http://www.dina.kvl.dk/~abraham/custom/
+;;; Commentary:
+;;
+;; See `widget.el'.
+;;; Code:
+(require 'widget)
+(require 'cl)
+(autoload 'pp-to-string "pp")
+(autoload 'Info-goto-node "info")
+(if (string-match "XEmacs" emacs-version)
+;; XEmacs spell `intangible' as `atomic'.
+(defun widget-make-intangible (from to side)
+"Make text between FROM and TO atomic with regard to movement.
+Third argument should be `start-open' if it should be sticky to the rear,
+and `end-open' if it should sticky to the front."
+(require 'atomic-extents)
+(let ((ext (make-extent from to)))
+	 ;; XEmacs doesn't understant different kinds of read-only, so
+	 ;; we have to use extents instead.
+	(put-text-property from to 'read-only nil)
+	(set-extent-property ext 'read-only t)
+	(set-extent-property ext 'start-open nil)
+	(set-extent-property ext 'end-open nil)
+	(set-extent-property ext side t)
+	(set-extent-property ext 'atomic t)))
+(defun widget-make-intangible (from to size)
+"Make text between FROM and TO intangible."
+(put-text-property from to 'intangible 'front)))
+;; The following should go away when bundled with Emacs.
+(eval-and-compile
+(condition-case ()
+(require 'custom)
+(error nil))
+(unless (and (featurep 'custom) (fboundp 'custom-declare-variable))
+;; We have the old custom-library, hack around it!
+(defmacro defgroup (&rest args) nil)
+(defmacro defcustom (var value doc &rest args)
+`(defvar ,var ,value ,doc))
+(defmacro defface (&rest args) nil)
+(define-widget-keywords :prefix :tag :load :link :options :type :group)
+(when (fboundp 'copy-face)
+(copy-face 'default 'widget-documentation-face)
+(copy-face 'bold 'widget-button-face)
+(copy-face 'italic 'widget-field-face))))
+;;; Compatibility.
+(unless (fboundp 'event-point)
+;; XEmacs function missing in Emacs.
+(defun event-point (event)
+"Return the character position of the given mouse-motion, button-press,
+or button-release event.  If the event did not occur over a window, or did
+not occur over text, then this returns nil.  Otherwise, it returns an index
+into the buffer visible in the event's window."
+(posn-point (event-start event))))
+(unless (fboundp 'error-message-string)
+;; Emacs function missing in XEmacs.
+(defun error-message-string (obj)
+"Convert an error value to an error message."
+(let ((buf (get-buffer-create " *error-message*")))
+(erase-buffer buf)
+(display-error obj buf)
+(buffer-string buf))))
+;;; Customization.
+(defgroup widgets nil
+"Customization support for the Widget Library."
+:link '(custom-manual "(widget)Top")
+:link '(url-link :tag "Development Page"
+		   "http://www.dina.kvl.dk/~abraham/custom/")
+:prefix "widget-"
+:group 'extensions
+:group 'faces
+:group 'hypermedia)
+(defface widget-documentation-face '((((class color)
+				       (background dark))
+				      (:foreground "lime green"))
+				     (((class color)
+				       (background light))
+				      (:foreground "dark green"))
+				     (t nil))
+"Face used for documentation text."
+:group 'widgets)
+(defface widget-button-face '((t (:bold t)))
+"Face used for widget buttons."
+:group 'widgets)
+(defcustom widget-mouse-face 'highlight
+"Face used for widget buttons when the mouse is above them."
+:type 'face
+:group 'widgets)
+(defface widget-field-face '((((class grayscale color)
+			       (background light))
+			      (:background "light gray"))
+			     (((class grayscale color)
+			       (background dark))
+			      (:background "dark gray"))
+			     (t
+			      (:italic t)))
+"Face used for editable fields."
+:group 'widgets)
+(defcustom widget-menu-max-size 40
+"Largest number of items allowed in a popup-menu.
+Larger menus are read through the minibuffer."
+:group 'widgets
+:type 'integer)
+;;; Utility functions.
+;;
+;; These are not really widget specific.
+(defsubst widget-plist-member (plist prop)
+;; Return non-nil if PLIST has the property PROP.
+;; PLIST is a property list, which is a list of the form
+;; (PROP1 VALUE1 PROP2 VALUE2 ...).  PROP is a symbol.
+;; Unlike `plist-get', this allows you to distinguish between a missing
+;; property and a property with the value nil.
+;; The value is actually the tail of PLIST whose car is PROP.
+(while (and plist (not (eq (car plist) prop)))
+(setq plist (cdr (cdr plist))))
+plist)
+(defun widget-princ-to-string (object)
+;; Return string representation of OBJECT, any Lisp object.
+;; No quoting characters are used; no delimiters are printed around
+;; the contents of strings.
+(save-excursion
+(set-buffer (get-buffer-create " *widget-tmp*"))
+(erase-buffer)
+(let ((standard-output (current-buffer)))
+(princ object))
+(buffer-string)))
+(defun widget-clear-undo ()
+"Clear all undo information."
+(buffer-disable-undo (current-buffer))
+(buffer-enable-undo))
+(defun widget-choose (title items &optional event)
+"Choose an item from a list.
+First argument TITLE is the name of the list.
+Second argument ITEMS is an alist (NAME . VALUE).
+Optional third argument EVENT is an input event.
+The user is asked to choose between each NAME from the items alist,
+and the VALUE of the chosen element will be returned.  If EVENT is a
+mouse event, and the number of elements in items is less than
+`widget-menu-max-size', a popup menu will be used, otherwise the
+minibuffer."
+(cond ((and (< (length items) widget-menu-max-size)
+	      event (fboundp 'x-popup-menu) window-system)
+	 ;; We are in Emacs-19, pressed by the mouse
+	 (x-popup-menu event
+		       (list title (cons "" items))))
+	((and (< (length items) widget-menu-max-size)
+	      event (fboundp 'popup-menu) window-system)
+	 ;; We are in XEmacs, pressed by the mouse
+	 (let ((val (get-popup-menu-response
+		     (cons title
+			   (mapcar
+			    (function
+			     (lambda (x)
+			       (vector (car x) (list (car x)) t)))
+			    items)))))
+	   (setq val (and val
+			  (listp (event-object val))
+			  (stringp (car-safe (event-object val)))
+			  (car (event-object val))))
+	   (cdr (assoc val items))))
+	(t
+	 (cdr (assoc (completing-read (concat title ": ")
+				      items nil t)
+		     items)))))
+(defun widget-get-sibling (widget)
+"Get the item WIDGET is assumed to toggle.
+This is only meaningful for radio buttons or checkboxes in a list."
+(let* ((parent (widget-get widget :parent))
+	 (children (widget-get parent :children))
+	 child)
+(catch 'child
+(while children
+	(setq child (car children)
+	      children (cdr children))
+	(when (eq (widget-get child :button) widget)
+	  (throw 'child child)))
+nil)))
+;;; Widget text specifications.
+;;
+;; These functions are for specifying text properties.
+(defun widget-specify-none (from to)
+;; Clear all text properties between FROM and TO.
+(set-text-properties from to nil))
+(defun widget-specify-text (from to)
+;; Default properties.
+(add-text-properties from to (list 'read-only t
+				     'front-sticky t
+				     'start-open t
+				     'end-open t
+				     'rear-nonsticky nil)))
+(defun widget-specify-field (widget from to)
+;; Specify editable button for WIDGET between FROM and TO.
+(widget-specify-field-update widget from to)
+;; Make it possible to edit the front end of the field.
+(add-text-properties (1- from) from (list 'rear-nonsticky t
+					    'end-open t
+					    'invisible t))
+(when (or (string-match "\\(.\\|\n\\)%v" (widget-get widget :format))
+	    (widget-get widget :hide-front-space))
+;; WARNING: This is going to lose horrible if the character just
+;; before the field can be modified (e.g. if it belongs to a
+;; choice widget).  We try to compensate by checking the format
+;; string, and hope the user hasn't changed the :create method.
+(widget-make-intangible (- from 2) from 'end-open))
+;; Make it possible to edit back end of the field.
+(add-text-properties to (1+ to) (list 'front-sticky nil
+					'read-only t
+					'start-open t))
+(cond ((widget-get widget :size)
+	 (put-text-property to (1+ to) 'invisible t)
+	 (when (or (string-match "%v\\(.\\|\n\\)" (widget-get widget :format))
+		   (widget-get widget :hide-rear-space))
+	   ;; WARNING: This is going to lose horrible if the character just
+	   ;; after the field can be modified (e.g. if it belongs to a
+	   ;; choice widget).  We try to compensate by checking the format
+	   ;; string, and hope the user hasn't changed the :create method.
+	   (widget-make-intangible to (+ to 2) 'start-open)))
+	((string-match "XEmacs" emacs-version)
+	 ;; XEmacs does not allow you to insert before a read-only
+	 ;; character, even if it is start.open.
+	 ;; XEmacs does allow you to delete an read-only extent, so
+	 ;; making the terminating newline read only doesn't help.
+	 ;; I tried putting an invisible intangible read-only space
+	 ;; before the newline, which gave really weird effects.
+	 ;; So for now, we just have trust the user not to delete the
+	 ;; newline.
+	 (put-text-property to (1+ to) 'read-only nil))))
+(defun widget-specify-field-update (widget from to)
+;; Specify editable button for WIDGET between FROM and TO.
+(let ((map (widget-get widget :keymap))
+	(secret (widget-get widget :secret))
+	(secret-to to)
+	(size (widget-get widget :size))
+	(face (or (widget-get widget :value-face)
+		  'widget-field-face)))
+(when secret
+(while (and size
+		  (not (zerop size))
+		  (> secret-to from)
+		  (eq (char-after (1- secret-to)) ?\ ))
+	(setq secret-to (1- secret-to)))
+(save-excursion
+	(goto-char from)
+	(while (< (point) secret-to)
+	  (let ((old (get-text-property (point) 'secret)))
+	    (when old
+	      (subst-char-in-region (point) (1+ (point)) secret old)))
+	  (forward-char))))
+(set-text-properties from to (list 'field widget
+				       'read-only nil
+				       'keymap map
+				       'local-map map
+				       'face face))
+(when secret
+(save-excursion
+	(goto-char from)
+	(while (< (point) secret-to)
+	  (let ((old (following-char)))
+	    (subst-char-in-region (point) (1+ (point)) old secret)
+	    (put-text-property (point) (1+ (point)) 'secret old))
+	  (forward-char))))
+(unless (widget-get widget :size)
+(add-text-properties to (1+ to) (list 'field widget
+					    'face face)))
+(add-text-properties to (1+ to) (list 'local-map map
+					  'keymap map))))
+(defun widget-specify-button (widget from to)
+;; Specify button for WIDGET between FROM and TO.
+(let ((face (widget-apply widget :button-face-get)))
+(add-text-properties from to (list 'button widget
+				       'mouse-face widget-mouse-face
+				       'start-open t
+				       'end-open t
+				       'face face))))
+(defun widget-specify-sample (widget from to)
+;; Specify sample for WIDGET between FROM and TO.
+(let ((face (widget-apply widget :sample-face-get)))
+(when face
+(add-text-properties from to (list 'start-open t
+					 'end-open t
+					 'face face)))))
+(defun widget-specify-doc (widget from to)
+;; Specify documentation for WIDGET between FROM and TO.
+(add-text-properties from to (list 'widget-doc widget
+				     'face 'widget-documentation-face)))
+(defmacro widget-specify-insert (&rest form)
+;; Execute FORM without inheriting any text properties.
+`(save-restriction
+(let ((inhibit-read-only t)
+	   result
+	   after-change-functions)
+(insert "<>")
+(narrow-to-region (- (point) 2) (point))
+(widget-specify-none (point-min) (point-max))
+(goto-char (1+ (point-min)))
+(setq result (progn ,@form))
+(delete-region (point-min) (1+ (point-min)))
+(delete-region (1- (point-max)) (point-max))
+(goto-char (point-max))
+result)))
+;;; Widget Properties.
+(defsubst widget-type (widget)
+"Return the type of WIDGET, a symbol."
+(car widget))
+(defun widget-put (widget property value)
+"In WIDGET set PROPERTY to VALUE.
+The value can later be retrived with `widget-get'."
+(setcdr widget (plist-put (cdr widget) property value)))
+(defun widget-get (widget property)
+"In WIDGET, get the value of PROPERTY.
+The value could either be specified when the widget was created, or
+later with `widget-put'."
+(let ((missing t)
+	value tmp)
+(while missing
+(cond ((setq tmp (widget-plist-member (cdr widget) property))
+	     (setq value (car (cdr tmp))
+		   missing nil))
+	    ((setq tmp (car widget))
+	     (setq widget (get tmp 'widget-type)))
+	    (t
+	     (setq missing nil))))
+value))
+(defun widget-member (widget property)
+"Non-nil iff there is a definition in WIDGET for PROPERTY."
+(cond ((widget-plist-member (cdr widget) property)
+	 t)
+	((car widget)
+	 (widget-member (get (car widget) 'widget-type) property))
+	(t nil)))
+(defun widget-apply (widget property &rest args)
+"Apply the value of WIDGET's PROPERTY to the widget itself.
+ARGS are passed as extra argments to the function."
+(apply (widget-get widget property) widget args))
+(defun widget-value (widget)
+"Extract the current value of WIDGET."
+(widget-apply widget
+		:value-to-external (widget-apply widget :value-get)))
+(defun widget-value-set (widget value)
+"Set the current value of WIDGET to VALUE."
+(widget-apply widget
+		:value-set (widget-apply widget
+					 :value-to-internal value)))
+(defun widget-match-inline (widget vals)
+;; In WIDGET, match the start of VALS.
+(cond ((widget-get widget :inline)
+	 (widget-apply widget :match-inline vals))
+	((and vals
+	      (widget-apply widget :match (car vals)))
+	 (cons (list (car vals)) (cdr vals)))
+	(t nil)))
+;;; Glyphs.
+(defcustom widget-glyph-directory (concat data-directory "custom/")
+"Where widget glyphs are located.
+If this variable is nil, widget will try to locate the directory
+automatically. This does not work yet."
+:group 'widgets
+:type 'directory)
+(defcustom widget-glyph-enable t
+"If non nil, use glyphs in images when available."
+:group 'widgets
+:type 'boolean)
+(defun widget-glyph-insert (widget tag image)
+"In WIDGET, insert the text TAG or, if supported, IMAGE.
+IMAGE should be a name sans extension of an xpm or xbm file located in
+`widget-glyph-directory'"
+(if (and (string-match "XEmacs" emacs-version)
+	   widget-glyph-enable
+	   (fboundp 'make-glyph)
+	   image)
+(let ((file (concat widget-glyph-directory
+			(if (string-match "/\\'" widget-glyph-directory)
+			    ""
+			  "/")
+			image
+			(if (featurep 'xpm) ".xpm" ".xbm"))))
+	(if (file-readable-p file)
+	    (widget-glyph-insert-glyph widget tag (make-glyph file))
+	  ;; File not readable, give up.
+	  (insert tag)))
+;; We don't want or can't use glyphs.
+(insert tag)))
+(defun widget-glyph-insert-glyph (widget tag glyph)
+"In WIDGET, with alternative text TAG, insert GLYPH."
+(set-glyph-image glyph (cons 'tty tag))
+(set-glyph-property glyph 'widget widget)
+(insert "*")
+(add-text-properties (1- (point)) (point)
+		       (list 'invisible t
+			     'end-glyph glyph)))
+;;; Creating Widgets.
+;;;###autoload
+(defun widget-create (type &rest args)
+"Create widget of TYPE.
+The optional ARGS are additional keyword arguments."
+(let ((widget (apply 'widget-convert type args)))
+(widget-apply widget :create)
+widget))
+(defun widget-create-child-and-convert (parent type &rest args)
+"As part of the widget PARENT, create a child widget TYPE.
+The child is converted, using the keyword arguments ARGS."
+(let ((widget (apply 'widget-convert type args)))
+(widget-put widget :parent parent)
+(unless (widget-get widget :indent)
+(widget-put widget :indent (+ (or (widget-get parent :indent) 0)
+				    (or (widget-get widget :extra-offset) 0)
+				    (widget-get parent :offset))))
+(widget-apply widget :create)
+widget))
+(defun widget-create-child (parent type)
+"Create widget of TYPE."
+(let ((widget (copy-list type)))
+(widget-put widget :parent parent)
+(unless (widget-get widget :indent)
+(widget-put widget :indent (+ (or (widget-get parent :indent) 0)
+				    (or (widget-get widget :extra-offset) 0)
+				    (widget-get parent :offset))))
+(widget-apply widget :create)
+widget))
+(defun widget-create-child-value (parent type value)
+"Create widget of TYPE with value VALUE."
+(let ((widget (copy-list type)))
+(widget-put widget :value (widget-apply widget :value-to-internal value))
+(widget-put widget :parent parent)
+(unless (widget-get widget :indent)
+(widget-put widget :indent (+ (or (widget-get parent :indent) 0)
+				    (or (widget-get widget :extra-offset) 0)
+				    (widget-get parent :offset))))
+(widget-apply widget :create)
+widget))
+;;;###autoload
+(defun widget-delete (widget)
+"Delete WIDGET."
+(widget-apply widget :delete))
+(defun widget-convert (type &rest args)
+"Convert TYPE to a widget without inserting it in the buffer.
+The optional ARGS are additional keyword arguments."
+;; Don't touch the type.
+(let* ((widget (if (symbolp type)
+		     (list type)
+		   (copy-list type)))
+	 (current widget)
+	 (keys args))
+;; First set the :args keyword.
+(while (cdr current)		;Look in the type.
+(let ((next (car (cdr current))))
+	(if (and (symbolp next) (eq (aref (symbol-name next) 0) ?:))
+	    (setq current (cdr (cdr current)))
+	  (setcdr current (list :args (cdr current)))
+	  (setq current nil))))
+(while args				;Look in the args.
+(let ((next (nth 0 args)))
+	(if (and (symbolp next) (eq (aref (symbol-name next) 0) ?:))
+	    (setq args (nthcdr 2 args))
+	  (widget-put widget :args args)
+	  (setq args nil))))
+;; Then Convert the widget.
+(setq type widget)
+(while type
+(let ((convert-widget (plist-get (cdr type) :convert-widget)))
+	(if convert-widget
+	    (setq widget (funcall convert-widget widget))))
+(setq type (get (car type) 'widget-type)))
+;; Finally set the keyword args.
+(while keys
+(let ((next (nth 0 keys)))
+	(if (and (symbolp next) (eq (aref (symbol-name next) 0) ?:))
+	    (progn
+	      (widget-put widget next (nth 1 keys))
+	      (setq keys (nthcdr 2 keys)))
+	  (setq keys nil))))
+;; Convert the :value to internal format.
+(if (widget-member widget :value)
+	(let ((value (widget-get widget :value)))
+	  (widget-put widget
+		      :value (widget-apply widget :value-to-internal value))))
+;; Return the newly create widget.
+widget))
+(defun widget-insert (&rest args)
+"Call `insert' with ARGS and make the text read only."
+(let ((inhibit-read-only t)
+	after-change-functions
+	(from (point)))
+(apply 'insert args)
+(widget-specify-text from (point))))
+;;; Keymap and Comands.
+(defvar widget-keymap nil
+"Keymap containing useful binding for buffers containing widgets.
+Recommended as a parent keymap for modes using widgets.")
+(unless widget-keymap
+(setq widget-keymap (make-sparse-keymap))
+(define-key widget-keymap "\C-k" 'widget-kill-line)
+(define-key widget-keymap "\t" 'widget-forward)
+(define-key widget-keymap "\M-\t" 'widget-backward)
+(define-key widget-keymap [(shift tab)] 'widget-backward)
+(define-key widget-keymap [backtab] 'widget-backward)
+(if (string-match "XEmacs" (emacs-version))
+(progn
+	(define-key widget-keymap [button2] 'widget-button-click)
+	(define-key widget-keymap [button1] 'widget-button1-click))
+(define-key widget-keymap [mouse-2] 'ignore)
+(define-key widget-keymap [down-mouse-2] 'widget-button-click))
+(define-key widget-keymap "\C-m" 'widget-button-press))
+(defvar widget-global-map global-map
+"Keymap used for events the widget does not handle themselves.")
+(make-variable-buffer-local 'widget-global-map)
+(defvar widget-field-keymap nil
+"Keymap used inside an editable field.")
+(unless widget-field-keymap
+(setq widget-field-keymap (copy-keymap widget-keymap))
+(unless (string-match "XEmacs" (emacs-version))
+(define-key widget-field-keymap [menu-bar] 'nil))
+(define-key widget-field-keymap "\C-m" 'widget-field-activate)
+(define-key widget-field-keymap "\C-a" 'widget-beginning-of-line)
+(define-key widget-field-keymap "\C-e" 'widget-end-of-line)
+(set-keymap-parent widget-field-keymap global-map))
+(defvar widget-text-keymap nil
+"Keymap used inside a text field.")
+(unless widget-text-keymap
+(setq widget-text-keymap (copy-keymap widget-keymap))
+(unless (string-match "XEmacs" (emacs-version))
+(define-key widget-text-keymap [menu-bar] 'nil))
+(define-key widget-text-keymap "\C-a" 'widget-beginning-of-line)
+(define-key widget-text-keymap "\C-e" 'widget-end-of-line)
+(set-keymap-parent widget-text-keymap global-map))
+(defun widget-field-activate (pos &optional event)
+"Activate the ediable field at point."
+(interactive "@d")
+(let ((field (get-text-property pos 'field)))
+(if field
+	(widget-apply field :action event)
+(call-interactively
+(lookup-key widget-global-map (this-command-keys))))))
+(defun widget-button-click (event)
+"Activate button below mouse pointer."
+(interactive "@e")
+(cond ((and (fboundp 'event-glyph)
+	      (event-glyph event))
+	 (let ((widget (glyph-property (event-glyph event) 'widget)))
+	   (if widget
+	       (widget-apply widget :action event)
+	     (message "You clicked on a glyph."))))
+	((event-point event)
+	 (let ((button (get-text-property (event-point event) 'button)))
+	   (if button
+	       (widget-apply button :action event)
+	     (call-interactively
+	      (or (lookup-key widget-global-map [ button2 ])
+		  (lookup-key widget-global-map [ down-mouse-2 ])
+		  (lookup-key widget-global-map [ mouse-2]))))))
+	(t
+	 (message "You clicked somewhere weird."))))
+(defun widget-button1-click (event)
+"Activate glyph below mouse pointer."
+(interactive "@e")
+(if (and (fboundp 'event-glyph)
+	   (event-glyph event))
+(let ((widget (glyph-property (event-glyph event) 'widget)))
+	(if widget
+	    (widget-apply widget :action event)
+	  (message "You clicked on a glyph.")))
+(call-interactively (lookup-key widget-global-map (this-command-keys)))))
+(defun widget-button-press (pos &optional event)
+"Activate button at POS."
+(interactive "@d")
+(let ((button (get-text-property pos 'button)))
+(if button
+	(widget-apply button :action event)
+(let ((command (lookup-key widget-global-map (this-command-keys))))
+	(when (commandp command)
+	  (call-interactively command))))))
+(defun widget-move (arg)
+"Move point to the ARG next field or button.
+ARG may be negative to move backward."
+(while (> arg 0)
+(setq arg (1- arg))
+(let ((next (cond ((get-text-property (point) 'button)
+		       (next-single-property-change (point) 'button))
+		      ((get-text-property (point) 'field)
+		       (next-single-property-change (point) 'field))
+		      (t
+		       (point)))))
+(if (null next)			; Widget extends to end. of buffer
+	  (setq next (point-min)))
+(let ((button (next-single-property-change next 'button))
+	    (field (next-single-property-change next 'field)))
+	(cond ((or (get-text-property next 'button)
+		   (get-text-property next 'field))
+	       (goto-char next))
+	      ((and button field)
+	       (goto-char (min button field)))
+	      (button (goto-char button))
+	      (field (goto-char field))
+	      (t
+	       (let ((button (next-single-property-change (point-min) 'button))
+		     (field (next-single-property-change (point-min) 'field)))
+		 (cond ((and button field) (goto-char (min button field)))
+		       (button (goto-char button))
+		       (field (goto-char field))
+		       (t
+			(error "No buttons or fields found")))))))))
+(while (< arg 0)
+(if (= (point-min) (point))
+	(forward-char 1))
+(setq arg (1+ arg))
+(let ((previous (cond ((get-text-property (1- (point)) 'button)
+			   (previous-single-property-change (point) 'button))
+			  ((get-text-property (1- (point)) 'field)
+			   (previous-single-property-change (point) 'field))
+			  (t
+			   (point)))))
+(if (null previous)		; Widget extends to beg. of buffer
+	  (setq previous (point-max)))
+(let ((button (previous-single-property-change previous 'button))
+	    (field (previous-single-property-change previous 'field)))
+	(cond ((and button field)
+	       (goto-char (max button field)))
+	      (button (goto-char button))
+	      (field (goto-char field))
+	      (t
+	       (let ((button (previous-single-property-change
+			      (point-max) 'button))
+		     (field (previous-single-property-change
+			     (point-max) 'field)))
+		 (cond ((and button field) (goto-char (max button field)))
+		       (button (goto-char button))
+		       (field (goto-char field))
+		       (t
+			(error "No buttons or fields found"))))))))
+(let ((button (previous-single-property-change (point) 'button))
+	  (field (previous-single-property-change (point) 'field)))
+(cond ((and button field)
+	     (goto-char (max button field)))
+	    (button (goto-char button))
+	    (field (goto-char field)))))
+(widget-echo-help (point))
+(run-hooks 'widget-move-hook))
+(defun widget-forward (arg)
+"Move point to the next field or button.
+With optional ARG, move across that many fields."
+(interactive "p")
+(run-hooks 'widget-forward-hook)
+(widget-move arg))
+(defun widget-backward (arg)
+"Move point to the previous field or button.
+With optional ARG, move across that many fields."
+(interactive "p")
+(run-hooks 'widget-backward-hook)
+(widget-move (- arg)))
+(defun widget-beginning-of-line ()
+"Go to beginning of field or beginning of line, whichever is first."
+(interactive)
+(let ((bol (save-excursion (beginning-of-line) (point)))
+	(prev (previous-single-property-change (point) 'field)))
+(goto-char (max bol (or prev bol)))))
+(defun widget-end-of-line ()
+"Go to end of field or end of line, whichever is first."
+(interactive)
+(let ((bol (save-excursion (end-of-line) (point)))
+	(prev (next-single-property-change (point) 'field)))
+(goto-char (min bol (or prev bol)))))
+(defun widget-kill-line ()
+"Kill to end of field or end of line, whichever is first."
+(interactive)
+(let ((field (get-text-property (point) 'field))
+	(newline (save-excursion (search-forward "\n")))
+	(next (next-single-property-change (point) 'field)))
+(if (and field (> newline next))
+	(kill-region (point) next)
+(call-interactively 'kill-line))))
+;;; Setting up the buffer.
+(defvar widget-field-new nil)
+;; List of all newly created editable fields in the buffer.
+(make-variable-buffer-local 'widget-field-new)
+(defvar widget-field-list nil)
+;; List of all editable fields in the buffer.
+(make-variable-buffer-local 'widget-field-list)
+(defun widget-setup ()
+"Setup current buffer so editing string widgets works."
+(let ((inhibit-read-only t)
+	(after-change-functions nil)
+	field)
+(while widget-field-new
+(setq field (car widget-field-new)
+	    widget-field-new (cdr widget-field-new)
+	    widget-field-list (cons field widget-field-list))
+(let ((from (widget-get field :value-from))
+	    (to (widget-get field :value-to)))
+	(widget-specify-field field from to)
+	(move-marker from (1- from))
+	(move-marker to (1+ to)))))
+(widget-clear-undo)
+;; We need to maintain text properties and size of the editing fields.
+(make-local-variable 'after-change-functions)
+(if widget-field-list
+(setq after-change-functions '(widget-after-change))
+(setq after-change-functions nil)))
+(defvar widget-field-last nil)
+;; Last field containing point.
+(make-variable-buffer-local 'widget-field-last)
+(defvar widget-field-was nil)
+;; The widget data before the change.
+(make-variable-buffer-local 'widget-field-was)
+(defun widget-field-find (pos)
+;; Find widget whose editing field is located at POS.
+;; Return nil if POS is not inside and editing field.
+;;
+;; This is only used in `widget-field-modified', since ordinarily
+;; you would just test the field property.
+(let ((fields widget-field-list)
+	field found)
+(while fields
+(setq field (car fields)
+	    fields (cdr fields))
+(let ((from (widget-get field :value-from))
+	    (to (widget-get field :value-to)))
+	(if (and from to (< from pos) (> to  pos))
+	    (setq fields nil
+		  found field))))
+found))
+(defun widget-after-change (from to old)
+;; Adjust field size and text properties.
+(condition-case nil
+(let ((field (widget-field-find from))
+	    (inhibit-read-only t))
+	(cond ((null field))
+	      ((not (eq field (widget-field-find to)))
+	       (debug)
+	       (message "Error: `widget-after-change' called on two fields"))
+	      (t
+	       (let ((size (widget-get field :size)))
+		 (if size
+		     (let ((begin (1+ (widget-get field :value-from)))
+			   (end (1- (widget-get field :value-to))))
+		       (widget-specify-field-update field begin end)
+		       (cond ((< (- end begin) size)
+			      ;; Field too small.
+			      (save-excursion
+				(goto-char end)
+				(insert-char ?\  (- (+ begin size) end))
+				(widget-specify-field-update field
+							     begin
+							     (+ begin size))))
+			     ((> (- end begin) size)
+			      ;; Field too large and
+			      (if (or (< (point) (+ begin size))
+				      (> (point) end))
+				  ;; Point is outside extra space.
+				  (setq begin (+ begin size))
+				;; Point is within the extra space.
+				(setq begin (point)))
+			      (save-excursion
+				(goto-char end)
+				(while (and (eq (preceding-char) ?\ )
+					    (> (point) begin))
+				  (delete-backward-char 1))))))
+		   (widget-specify-field-update field from to)))
+	       (widget-apply field :notify field))))
+(error (debug))))
+;;; Widget Functions
+;;
+;; These functions are used in the definition of multiple widgets.
+(defun widget-children-value-delete (widget)
+"Delete all :children and :buttons in WIDGET."
+(mapcar 'widget-delete (widget-get widget :children))
+(widget-put widget :children nil)
+(mapcar 'widget-delete (widget-get widget :buttons))
+(widget-put widget :buttons nil))
+(defun widget-types-convert-widget (widget)
+"Convert :args as widget types in WIDGET."
+(widget-put widget :args (mapcar 'widget-convert (widget-get widget :args)))
+widget)
+;;; The `default' Widget.
+(define-widget 'default nil
+"Basic widget other widgets are derived from."
+:value-to-internal (lambda (widget value) value)
+:value-to-external (lambda (widget value) value)
+:create 'widget-default-create
+:indent nil
+:offset 0
+:format-handler 'widget-default-format-handler
+:button-face-get 'widget-default-button-face-get
+:sample-face-get 'widget-default-sample-face-get
+:delete 'widget-default-delete
+:value-set 'widget-default-value-set
+:value-inline 'widget-default-value-inline
+:menu-tag-get 'widget-default-menu-tag-get
+:validate (lambda (widget) nil)
+:action 'widget-default-action
+:notify 'widget-default-notify)
+(defun widget-default-create (widget)
+"Create WIDGET at point in the current buffer."
+(widget-specify-insert
+(let ((from (point))
+	 (tag (widget-get widget :tag))
+	 (glyph (widget-get widget :tag-glyph))
+	 (doc (widget-get widget :doc))
+	 button-begin button-end
+	 sample-begin sample-end
+	 doc-begin doc-end
+	 value-pos)
+(insert (widget-get widget :format))
+(goto-char from)
+;; Parse escapes in format.
+(while (re-search-forward "%\\(.\\)" nil t)
+(let ((escape (aref (match-string 1) 0)))
+	 (replace-match "" t t)
+	 (cond ((eq escape ?%)
+		(insert "%"))
+	       ((eq escape ?\[)
+		(setq button-begin (point)))
+	       ((eq escape ?\])
+		(setq button-end (point)))
+	       ((eq escape ?\{)
+		(setq sample-begin (point)))
+	       ((eq escape ?\})
+		(setq sample-end (point)))
+	       ((eq escape ?n)
+		(when (widget-get widget :indent)
+		  (insert "\n")
+		  (insert-char ?  (widget-get widget :indent))))
+	       ((eq escape ?t)
+		(cond (glyph
+		       (widget-glyph-insert widget (or tag "image") glyph))
+		      (tag
+		       (insert tag))
+		      (t
+		       (let ((standard-output (current-buffer)))
+			 (princ (widget-get widget :value))))))
+	       ((eq escape ?d)
+		(when doc
+		  (setq doc-begin (point))
+		  (insert doc)
+		  (while (eq (preceding-char) ?\n)
+		    (delete-backward-char 1))
+		  (insert "\n")
+		  (setq doc-end (point))))
+	       ((eq escape ?v)
+		(if (and button-begin (not button-end))
+		    (widget-apply widget :value-create)
+		  (setq value-pos (point))))
+	       (t
+		(widget-apply widget :format-handler escape)))))
+;; Specify button, sample, and doc, and insert value.
+(and button-begin button-end
+	  (widget-specify-button widget button-begin button-end))
+(and sample-begin sample-end
+	  (widget-specify-sample widget sample-begin sample-end))
+(and doc-begin doc-end
+	  (widget-specify-doc widget doc-begin doc-end))
+(when value-pos
+(goto-char value-pos)
+(widget-apply widget :value-create)))
+(let ((from (copy-marker (point-min)))
+	 (to (copy-marker (point-max))))
+(widget-specify-text from to)
+(set-marker-insertion-type from t)
+(set-marker-insertion-type to nil)
+(widget-put widget :from from)
+(widget-put widget :to to))))
+(defun widget-default-format-handler (widget escape)
+;; We recognize the %h escape by default.
+(let* ((buttons (widget-get widget :buttons))
+	 (doc-property (widget-get widget :documentation-property))
+	 (doc-try (cond ((widget-get widget :doc))
+			((symbolp doc-property)
+			 (documentation-property (widget-get widget :value)
+						 doc-property))
+			(t
+			 (funcall doc-property (widget-get widget :value)))))
+	 (doc-text (and (stringp doc-try)
+			(> (length doc-try) 1)
+			doc-try)))
+(cond ((eq escape ?h)
+	   (when doc-text
+	     (and (eq (preceding-char) ?\n)
+		  (widget-get widget :indent)
+		  (insert-char ?  (widget-get widget :indent)))
+	     ;; The `*' in the beginning is redundant.
+	     (when (eq (aref doc-text  0) ?*)
+	       (setq doc-text (substring doc-text 1)))
+	     ;; Get rid of trailing newlines.
+	     (when (string-match "\n+\\'" doc-text)
+	       (setq doc-text (substring doc-text 0 (match-beginning 0))))
+	     (push (if (string-match "\n." doc-text)
+		       ;; Allow multiline doc to be hiden.
+		       (widget-create-child-and-convert
+			widget 'widget-help
+			:doc (progn
+			       (string-match "\\`.*" doc-text)
+			       (match-string 0 doc-text))
+			:widget-doc doc-text
+			"?")
+		     ;; A single line is just inserted.
+		     (widget-create-child-and-convert
+		      widget 'item :format "%d" :doc doc-text nil))
+		   buttons)))
+	  (t
+	   (error "Unknown escape `%c'" escape)))
+(widget-put widget :buttons buttons)))
+(defun widget-default-button-face-get (widget)
+;; Use :button-face or widget-button-face
+(or (widget-get widget :button-face) 'widget-button-face))
+(defun widget-default-sample-face-get (widget)
+;; Use :sample-face.
+(widget-get widget :sample-face))
+(defun widget-default-delete (widget)
+;; Remove widget from the buffer.
+(let ((from (widget-get widget :from))
+	(to (widget-get widget :to))
+	(inhibit-read-only t)
+	after-change-functions)
+(widget-apply widget :value-delete)
+(delete-region from to)
+(set-marker from nil)
+(set-marker to nil)))
+(defun widget-default-value-set (widget value)
+;; Recreate widget with new value.
+(save-excursion
+(goto-char (widget-get widget :from))
+(widget-apply widget :delete)
+(widget-put widget :value value)
+(widget-apply widget :create)))
+(defun widget-default-value-inline (widget)
+;; Wrap value in a list unless it is inline.
+(if (widget-get widget :inline)
+(widget-value widget)
+(list (widget-value widget))))
+(defun widget-default-menu-tag-get (widget)
+;; Use tag or value for menus.
+(or (widget-get widget :menu-tag)
+(widget-get widget :tag)
+(widget-princ-to-string (widget-get widget :value))))
+(defun widget-default-action (widget &optional event)
+;; Notify the parent when a widget change
+(let ((parent (widget-get widget :parent)))
+(when parent
+(widget-apply parent :notify widget event))))
+(defun widget-default-notify (widget child &optional event)
+;; Pass notification to parent.
+(widget-default-action widget event))
+;;; The `item' Widget.
+(define-widget 'item 'default
+"Constant items for inclusion in other widgets."
+:convert-widget 'widget-item-convert-widget
+:value-create 'widget-item-value-create
+:value-delete 'ignore
+:value-get 'widget-item-value-get
+:match 'widget-item-match
+:match-inline 'widget-item-match-inline
+:action 'widget-item-action
+:format "%t\n")
+(defun widget-item-convert-widget (widget)
+;; Initialize :value from :args in WIDGET.
+(let ((args (widget-get widget :args)))
+(when args
+(widget-put widget :value (widget-apply widget
+					      :value-to-internal (car args)))
+(widget-put widget :args nil)))
+widget)
+(defun widget-item-value-create (widget)
+;; Insert the printed representation of the value.
+(let ((standard-output (current-buffer)))
+(princ (widget-get widget :value))))
+(defun widget-item-match (widget value)
+;; Match if the value is the same.
+(equal (widget-get widget :value) value))
+(defun widget-item-match-inline (widget values)
+;; Match if the value is the same.
+(let ((value (widget-get widget :value)))
+(and (listp value)
+	 (<= (length value) (length values))
+	 (let ((head (subseq values 0 (length value))))
+	   (and (equal head value)
+		(cons head (subseq values (length value))))))))
+(defun widget-item-action (widget &optional event)
+;; Just notify itself.
+(widget-apply widget :notify widget event))
+(defun widget-item-value-get (widget)
+;; Items are simple.
+(widget-get widget :value))
+;;; The `push-button' Widget.
+(defcustom widget-push-button-gui t
+"If non nil, use GUI push buttons when available."
+:group 'widgets
+:type 'boolean)
+;; Cache already created GUI objects.
+(defvar widget-push-button-cache nil)
+(define-widget 'push-button 'item
+"A pushable button."
+:value-create 'widget-push-button-value-create
+:format "%[%v%]")
+(defun widget-push-button-value-create (widget)
+;; Insert text representing the `on' and `off' states.
+(let* ((tag (or (widget-get widget :tag)
+		  (widget-get widget :value)))
+	 (text (concat "[" tag "]"))
+	 (gui (cdr (assoc tag widget-push-button-cache))))
+(if (and (fboundp 'make-gui-button)
+	     (fboundp 'make-glyph)
+	     widget-push-button-gui
+	     (fboundp 'device-on-window-system-p)
+	     (device-on-window-system-p)
+	     (string-match "XEmacs" emacs-version))
+	(progn
+	  (unless gui
+	    (setq gui (make-gui-button tag 'widget-gui-action widget))
+	    (push (cons tag gui) widget-push-button-cache))
+	  (widget-glyph-insert-glyph widget text
+				     (make-glyph (car (aref gui 1)))))
+(insert text))))
+(defun widget-gui-action (widget)
+"Apply :action for WIDGET."
+(widget-apply widget :action (this-command-keys)))
+;;; The `link' Widget.
+(define-widget 'link 'item
+"An embedded link."
+:help-echo "Push me to follow the link."
+:format "%[_%t_%]")
+;;; The `info-link' Widget.
+(define-widget 'info-link 'link
+"A link to an info file."
+:action 'widget-info-link-action)
+(defun widget-info-link-action (widget &optional event)
+"Open the info node specified by WIDGET."
+(Info-goto-node (widget-value widget)))
+;;; The `url-link' Widget.
+(define-widget 'url-link 'link
+"A link to an www page."
+:action 'widget-url-link-action)
+(defun widget-url-link-action (widget &optional event)
+"Open the url specified by WIDGET."
+(require 'browse-url)
+(funcall browse-url-browser-function (widget-value widget)))
+;;; The `editable-field' Widget.
+(define-widget 'editable-field 'default
+"An editable text field."
+:convert-widget 'widget-item-convert-widget
+:keymap widget-field-keymap
+:format "%v"
+:value ""
+:action 'widget-field-action
+:validate 'widget-field-validate
+:valid-regexp ""
+:error "No match"
+:value-create 'widget-field-value-create
+:value-delete 'widget-field-value-delete
+:value-get 'widget-field-value-get
+:match 'widget-field-match)
+;; History of field minibuffer edits.
+(defvar widget-field-history nil)
+(defun widget-field-action (widget &optional event)
+;; Edit the value in the minibuffer.
+(let ((tag (widget-apply widget :menu-tag-get))
+	(invalid (widget-apply widget :validate)))
+(when invalid
+(error (widget-get invalid :error)))
+(widget-value-set widget
+		      (widget-apply widget
+				    :value-to-external
+				    (read-string (concat tag ": ")
+						 (widget-apply
+						  widget
+						  :value-to-internal
+						  (widget-value widget))
+						 'widget-field-history)))
+(widget-apply widget :notify widget event)
+(widget-setup)))
+(defun widget-field-validate (widget)
+;; Valid if the content matches `:valid-regexp'.
+(save-excursion
+(let ((value (widget-apply widget :value-get))
+	  (regexp (widget-get widget :valid-regexp)))
+(if (string-match regexp value)
+	  nil
+	widget))))
+(defun widget-field-value-create (widget)
+;; Create an editable text field.
+(insert " ")
+(let ((size (widget-get widget :size))
+	(value (widget-get widget :value))
+	(from (point)))
+(insert value)
+(and size
+	 (< (length value) size)
+	 (insert-char ?\  (- size (length value))))
+(unless (memq widget widget-field-list)
+(setq widget-field-new (cons widget widget-field-new)))
+(widget-put widget :value-to (copy-marker (point)))
+(set-marker-insertion-type (widget-get widget :value-to) nil)
+(if (null size)
+	(insert ?\n)
+(insert ?\ ))
+(widget-put widget :value-from (copy-marker from))
+(set-marker-insertion-type (widget-get widget :value-from) t)))
+(defun widget-field-value-delete (widget)
+;; Remove the widget from the list of active editing fields.
+(setq widget-field-list (delq widget widget-field-list))
+;; These are nil if the :format string doesn't contain `%v'.
+(when (widget-get widget :value-from)
+(set-marker (widget-get widget :value-from) nil))
+(when (widget-get widget :value-from)
+(set-marker (widget-get widget :value-to) nil)))
+(defun widget-field-value-get (widget)
+;; Return current text in editing field.
+(let ((from (widget-get widget :value-from))
+	(to (widget-get widget :value-to))
+	(size (widget-get widget :size))
+	(secret (widget-get widget :secret))
+	(old (current-buffer)))
+(if (and from to)
+	(progn
+	  (set-buffer (marker-buffer from))
+	  (setq from (1+ from)
+		to (1- to))
+	  (while (and size
+		      (not (zerop size))
+		      (> to from)
+		      (eq (char-after (1- to)) ?\ ))
+	    (setq to (1- to)))
+	  (let ((result (buffer-substring-no-properties from to)))
+	    (when secret
+	      (let ((index 0))
+		(while (< (+ from index) to)
+		  (aset result index
+			(get-text-property (+ from index) 'secret))
+		  (setq index (1+ index)))))
+	    (set-buffer old)
+	    result))
+(widget-get widget :value))))
+(defun widget-field-match (widget value)
+;; Match any string.
+(stringp value))
+;;; The `text' Widget.
+(define-widget 'text 'editable-field
+:keymap widget-text-keymap
+"A multiline text area.")
+;;; The `menu-choice' Widget.
+(define-widget 'menu-choice 'default
+"A menu of options."
+:convert-widget  'widget-types-convert-widget
+:format "%[%t%]: %v"
+:case-fold t
+:tag "choice"
+:void '(item :format "invalid (%t)\n")
+:value-create 'widget-choice-value-create
+:value-delete 'widget-children-value-delete
+:value-get 'widget-choice-value-get
+:value-inline 'widget-choice-value-inline
+:action 'widget-choice-action
+:error "Make a choice"
+:validate 'widget-choice-validate
+:match 'widget-choice-match
+:match-inline 'widget-choice-match-inline)
+(defun widget-choice-value-create (widget)
+;; Insert the first choice that matches the value.
+(let ((value (widget-get widget :value))
+	(args (widget-get widget :args))
+	current)
+(while args
+(setq current (car args)
+	    args (cdr args))
+(when (widget-apply current :match value)
+	(widget-put widget :children (list (widget-create-child-value
+					    widget current value)))
+	(widget-put widget :choice current)
+	(setq args nil
+	      current nil)))
+(when current
+(let ((void (widget-get widget :void)))
+	(widget-put widget :children (list (widget-create-child-and-convert
+					    widget void :value value)))
+	(widget-put widget :choice void)))))
+(defun widget-choice-value-get (widget)
+;; Get value of the child widget.
+(widget-value (car (widget-get widget :children))))
+(defun widget-choice-value-inline (widget)
+;; Get value of the child widget.
+(widget-apply (car (widget-get widget :children)) :value-inline))
+(defun widget-choice-action (widget &optional event)
+;; Make a choice.
+(let ((args (widget-get widget :args))
+	(old (widget-get widget :choice))
+	(tag (widget-apply widget :menu-tag-get))
+	(completion-ignore-case (widget-get widget :case-fold))
+	current choices)
+;; Remember old value.
+(if (and old (not (widget-apply widget :validate)))
+	(let* ((external (widget-value widget))
+	       (internal (widget-apply old :value-to-internal external)))
+	  (widget-put old :value internal)))
+;; Find new choice.
+(setq current
+	  (cond ((= (length args) 0)
+		 nil)
+		((= (length args) 1)
+		 (nth 0 args))
+		((and (= (length args) 2)
+		      (memq old args))
+		 (if (eq old (nth 0 args))
+		     (nth 1 args)
+		   (nth 0 args)))
+		(t
+		 (while args
+		   (setq current (car args)
+			 args (cdr args))
+		   (setq choices
+			 (cons (cons (widget-apply current :menu-tag-get)
+				     current)
+			       choices)))
+		 (widget-choose tag (reverse choices) event))))
+(when current
+(widget-value-set widget
+			(widget-apply current :value-to-external
+				      (widget-get current :value)))
+(widget-apply widget :notify widget event)
+(widget-setup)))
+;; Notify parent.
+(widget-apply widget :notify widget event)
+(widget-clear-undo))
+(defun widget-choice-validate (widget)
+;; Valid if we have made a valid choice.
+(let ((void (widget-get widget :void))
+	(choice (widget-get widget :choice))
+	(child (car (widget-get widget :children))))
+(if (eq void choice)
+	widget
+(widget-apply child :validate))))
+(defun widget-choice-match (widget value)
+;; Matches if one of the choices matches.
+(let ((args (widget-get widget :args))
+	current found)
+(while (and args (not found))
+(setq current (car args)
+	    args (cdr args)
+	    found (widget-apply current :match value)))
+found))
+(defun widget-choice-match-inline (widget values)
+;; Matches if one of the choices matches.
+(let ((args (widget-get widget :args))
+	current found)
+(while (and args (null found))
+(setq current (car args)
+	    args (cdr args)
+	    found (widget-match-inline current values)))
+found))
+;;; The `toggle' Widget.
+(define-widget 'toggle 'item
+"Toggle between two states."
+:format "%[%v%]\n"
+:value-create 'widget-toggle-value-create
+:action 'widget-toggle-action
+:match (lambda (widget value) t)
+:on "on"
+:off "off")
+(defun widget-toggle-value-create (widget)
+;; Insert text representing the `on' and `off' states.
+(if (widget-value widget)
+(widget-glyph-insert widget
+			   (widget-get widget :on)
+			   (widget-get widget :on-glyph))
+(widget-glyph-insert widget
+			 (widget-get widget :off)
+			 (widget-get widget :off-glyph))))
+(defun widget-toggle-action (widget &optional event)
+;; Toggle value.
+(widget-value-set widget (not (widget-value widget)))
+(widget-apply widget :notify widget event))
+;;; The `checkbox' Widget.
+(define-widget 'checkbox 'toggle
+"A checkbox toggle."
+:format "%[%v%]"
+:on "[X]"
+:on-glyph "check1"
+:off "[ ]"
+:off-glyph "check0")
+;;; The `checklist' Widget.
+(define-widget 'checklist 'default
+"A multiple choice widget."
+:convert-widget 'widget-types-convert-widget
+:format "%v"
+:offset 4
+:entry-format "%b %v"
+:menu-tag "checklist"
+:greedy nil
+:value-create 'widget-checklist-value-create
+:value-delete 'widget-children-value-delete
+:value-get 'widget-checklist-value-get
+:validate 'widget-checklist-validate
+:match 'widget-checklist-match
+:match-inline 'widget-checklist-match-inline)
+(defun widget-checklist-value-create (widget)
+;; Insert all values
+(let ((alist (widget-checklist-match-find widget (widget-get widget :value)))
+	(args (widget-get widget :args)))
+(while args
+(widget-checklist-add-item widget (car args) (assq (car args) alist))
+(setq args (cdr args)))
+(widget-put widget :children (nreverse (widget-get widget :children)))))
+(defun widget-checklist-add-item (widget type chosen)
+;; Create checklist item in WIDGET of type TYPE.
+;; If the item is checked, CHOSEN is a cons whose cdr is the value.
+(and (eq (preceding-char) ?\n)
+(widget-get widget :indent)
+(insert-char ?  (widget-get widget :indent)))
+(widget-specify-insert
+(let* ((children (widget-get widget :children))
+	  (buttons (widget-get widget :buttons))
+	  (from (point))
+	  child button)
+(insert (widget-get widget :entry-format))
+(goto-char from)
+;; Parse % escapes in format.
+(while (re-search-forward "%\\([bv%]\\)" nil t)
+(let ((escape (aref (match-string 1) 0)))
+	 (replace-match "" t t)
+	 (cond ((eq escape ?%)
+		(insert "%"))
+	       ((eq escape ?b)
+		(setq button (widget-create-child-and-convert
+			      widget 'checkbox :value (not (null chosen)))))
+	       ((eq escape ?v)
+		(setq child
+		      (cond ((not chosen)
+			     (widget-create-child widget type))
+			    ((widget-get type :inline)
+			     (widget-create-child-value
+			      widget type (cdr chosen)))
+			    (t
+			     (widget-create-child-value
+			      widget type (car (cdr chosen)))))))
+	       (t
+		(error "Unknown escape `%c'" escape)))))
+;; Update properties.
+(and button child (widget-put child :button button))
+(and button (widget-put widget :buttons (cons button buttons)))
+(and child (widget-put widget :children (cons child children))))))
+(defun widget-checklist-match (widget values)
+;; All values must match a type in the checklist.
+(and (listp values)
+(null (cdr (widget-checklist-match-inline widget values)))))
+(defun widget-checklist-match-inline (widget values)
+;; Find the values which match a type in the checklist.
+(let ((greedy (widget-get widget :greedy))
+	(args (copy-list (widget-get widget :args)))
+	found rest)
+(while values
+(let ((answer (widget-checklist-match-up args values)))
+	(cond (answer
+	       (let ((vals (widget-match-inline answer values)))
+		 (setq found (append found (car vals))
+		       values (cdr vals)
+		       args (delq answer args))))
+	      (greedy
+	       (setq rest (append rest (list (car values)))
+		     values (cdr values)))
+	      (t
+	       (setq rest (append rest values)
+		     values nil)))))
+(cons found rest)))
+(defun widget-checklist-match-find (widget vals)
+;; Find the vals which match a type in the checklist.
+;; Return an alist of (TYPE MATCH).
+(let ((greedy (widget-get widget :greedy))
+	(args (copy-list (widget-get widget :args)))
+	found)
+(while vals
+(let ((answer (widget-checklist-match-up args vals)))
+	(cond (answer
+	       (let ((match (widget-match-inline answer vals)))
+		 (setq found (cons (cons answer (car match)) found)
+		       vals (cdr match)
+		       args (delq answer args))))
+	      (greedy
+	       (setq vals (cdr vals)))
+	      (t
+	       (setq vals nil)))))
+found))
+(defun widget-checklist-match-up (args vals)
+;; Rerturn the first type from ARGS that matches VALS.
+(let (current found)
+(while (and args (null found))
+(setq current (car args)
+	    args (cdr args)
+	    found (widget-match-inline current vals)))
+(if found
+	current
+nil)))
+(defun widget-checklist-value-get (widget)
+;; The values of all selected items.
+(let ((children (widget-get widget :children))
+	child result)
+(while children
+(setq child (car children)
+	    children (cdr children))
+(if (widget-value (widget-get child :button))
+	  (setq result (append result (widget-apply child :value-inline)))))
+result))
+(defun widget-checklist-validate (widget)
+;; Ticked chilren must be valid.
+(let ((children (widget-get widget :children))
+	child button found)
+(while (and children (not found))
+(setq child (car children)
+	    children (cdr children)
+	    button (widget-get child :button)
+	    found (and (widget-value button)
+		       (widget-apply child :validate))))
+found))
+;;; The `option' Widget
+(define-widget 'option 'checklist
+"An widget with an optional item."
+:inline t)
+;;; The `choice-item' Widget.
+(define-widget 'choice-item 'item
+"Button items that delegate action events to their parents."
+:action 'widget-choice-item-action
+:format "%[%t%] \n")
+(defun widget-choice-item-action (widget &optional event)
+;; Tell parent what happened.
+(widget-apply (widget-get widget :parent) :action event))
+;;; The `radio-button' Widget.
+(define-widget 'radio-button 'toggle
+"A radio button for use in the `radio' widget."
+:notify 'widget-radio-button-notify
+:format "%[%v%]"
+:on "(*)"
+:on-glyph "radio1"
+:off "( )"
+:off-glyph "radio0")
+(defun widget-radio-button-notify (widget child &optional event)
+;; Tell daddy.
+(widget-apply (widget-get widget :parent) :action widget event))
+;;; The `radio-button-choice' Widget.
+(define-widget 'radio-button-choice 'default
+"Select one of multiple options."
+:convert-widget 'widget-types-convert-widget
+:offset 4
+:format "%v"
+:entry-format "%b %v"
+:menu-tag "radio"
+:value-create 'widget-radio-value-create
+:value-delete 'widget-children-value-delete
+:value-get 'widget-radio-value-get
+:value-inline 'widget-radio-value-inline
+:value-set 'widget-radio-value-set
+:error "You must push one of the buttons"
+:validate 'widget-radio-validate
+:match 'widget-choice-match
+:match-inline 'widget-choice-match-inline
+:action 'widget-radio-action)
+(defun widget-radio-value-create (widget)
+;; Insert all values
+(let ((args (widget-get widget :args))
+	arg)
+(while args
+(setq arg (car args)
+	    args (cdr args))
+(widget-radio-add-item widget arg))))
+(defun widget-radio-add-item (widget type)
+"Add to radio widget WIDGET a new radio button item of type TYPE."
+;; (setq type (widget-convert type))
+(and (eq (preceding-char) ?\n)
+(widget-get widget :indent)
+(insert-char ?  (widget-get widget :indent)))
+(widget-specify-insert
+(let* ((value (widget-get widget :value))
+	  (children (widget-get widget :children))
+	  (buttons (widget-get widget :buttons))
+	  (from (point))
+	  (chosen (and (null (widget-get widget :choice))
+		       (widget-apply type :match value)))
+	  child button)
+(insert (widget-get widget :entry-format))
+(goto-char from)
+;; Parse % escapes in format.
+(while (re-search-forward "%\\([bv%]\\)" nil t)
+(let ((escape (aref (match-string 1) 0)))
+	 (replace-match "" t t)
+	 (cond ((eq escape ?%)
+		(insert "%"))
+	       ((eq escape ?b)
+		(setq button (widget-create-child-and-convert
+			      widget 'radio-button
+			      :value (not (null chosen)))))
+	       ((eq escape ?v)
+		(setq child (if chosen
+				(widget-create-child-value
+				 widget type value)
+			      (widget-create-child widget type))))
+	       (t
+		(error "Unknown escape `%c'" escape)))))
+;; Update properties.
+(when chosen
+(widget-put widget :choice type))
+(when button
+(widget-put child :button button)
+(widget-put widget :buttons (nconc buttons (list button))))
+(when child
+(widget-put widget :children (nconc children (list child))))
+child)))
+(defun widget-radio-value-get (widget)
+;; Get value of the child widget.
+(let ((chosen (widget-radio-chosen widget)))
+(and chosen (widget-value chosen))))
+(defun widget-radio-chosen (widget)
+"Return the widget representing the chosen radio button."
+(let ((children (widget-get widget :children))
+	current found)
+(while children
+(setq current (car children)
+	    children (cdr children))
+(let* ((button (widget-get current :button))
+	     (value (widget-apply button :value-get)))
+	(when value
+	  (setq found current
+		children nil))))
+found))
+(defun widget-radio-value-inline (widget)
+;; Get value of the child widget.
+(let ((children (widget-get widget :children))
+	current found)
+(while children
+(setq current (car children)
+	    children (cdr children))
+(let* ((button (widget-get current :button))
+	     (value (widget-apply button :value-get)))
+	(when value
+	  (setq found (widget-apply current :value-inline)
+		children nil))))
+found))
+(defun widget-radio-value-set (widget value)
+;; We can't just delete and recreate a radio widget, since children
+;; can be added after the original creation and won't be recreated
+;; by `:create'.
+(let ((children (widget-get widget :children))
+	current found)
+(while children
+(setq current (car children)
+	    children (cdr children))
+(let* ((button (widget-get current :button))
+	     (match (and (not found)
+			 (widget-apply current :match value))))
+	(widget-value-set button match)
+	(if match
+	    (widget-value-set current value))
+	(setq found (or found match))))))
+(defun widget-radio-validate (widget)
+;; Valid if we have made a valid choice.
+(let ((children (widget-get widget :children))
+	current found button)
+(while (and children (not found))
+(setq current (car children)
+	    children (cdr children)
+	    button (widget-get current :button)
+	    found (widget-apply button :value-get)))
+(if found
+	(widget-apply current :validate)
+widget)))
+(defun widget-radio-action (widget child event)
+;; Check if a radio button was pressed.
+(let ((children (widget-get widget :children))
+	(buttons (widget-get widget :buttons))
+	current)
+(when (memq child buttons)
+(while children
+	(setq current (car children)
+	      children (cdr children))
+	(let* ((button (widget-get current :button)))
+	  (cond ((eq child button)
+		 (widget-value-set button t))
+		((widget-value button)
+		 (widget-value-set button nil)))))))
+;; Pass notification to parent.
+(widget-apply widget :notify child event))
+;;; The `insert-button' Widget.
+(define-widget 'insert-button 'push-button
+"An insert button for the `editable-list' widget."
+:tag "INS"
+:action 'widget-insert-button-action)
+(defun widget-insert-button-action (widget &optional event)
+;; Ask the parent to insert a new item.
+(widget-apply (widget-get widget :parent)
+		:insert-before (widget-get widget :widget)))
+;;; The `delete-button' Widget.
+(define-widget 'delete-button 'push-button
+"A delete button for the `editable-list' widget."
+:tag "DEL"
+:action 'widget-delete-button-action)
+(defun widget-delete-button-action (widget &optional event)
+;; Ask the parent to insert a new item.
+(widget-apply (widget-get widget :parent)
+		:delete-at (widget-get widget :widget)))
+;;; The `editable-list' Widget.
+(defcustom widget-editable-list-gui nil
+"If non nil, use GUI push-buttons in editable list when available."
+:type 'boolean
+:group 'widgets)
+(define-widget 'editable-list 'default
+"A variable list of widgets of the same type."
+:convert-widget 'widget-types-convert-widget
+:offset 12
+:format "%v%i\n"
+:format-handler 'widget-editable-list-format-handler
+:entry-format "%i %d %v"
+:menu-tag "editable-list"
+:value-create 'widget-editable-list-value-create
+:value-delete 'widget-children-value-delete
+:value-get 'widget-editable-list-value-get
+:validate 'widget-editable-list-validate
+:match 'widget-editable-list-match
+:match-inline 'widget-editable-list-match-inline
+:insert-before 'widget-editable-list-insert-before
+:delete-at 'widget-editable-list-delete-at)
+(defun widget-editable-list-format-handler (widget escape)
+;; We recognize the insert button.
+(let ((widget-push-button-gui widget-editable-list-gui))
+(cond ((eq escape ?i)
+	   (and (widget-get widget :indent)
+		(insert-char ?  (widget-get widget :indent)))
+	   (widget-create-child-and-convert widget 'insert-button))
+	  (t
+	   (widget-default-format-handler widget escape)))))
+(defun widget-editable-list-value-create (widget)
+;; Insert all values
+(let* ((value (widget-get widget :value))
+	 (type (nth 0 (widget-get widget :args)))
+	 (inlinep (widget-get type :inline))
+	 children)
+(widget-put widget :value-pos (copy-marker (point)))
+(set-marker-insertion-type (widget-get widget :value-pos) t)
+(while value
+(let ((answer (widget-match-inline type value)))
+	(if answer
+	    (setq children (cons (widget-editable-list-entry-create
+				  widget
+				  (if inlinep
+				      (car answer)
+				    (car (car answer)))
+				  t)
+				 children)
+		  value (cdr answer))
+	  (setq value nil))))
+(widget-put widget :children (nreverse children))))
+(defun widget-editable-list-value-get (widget)
+;; Get value of the child widget.
+(apply 'append (mapcar (lambda (child) (widget-apply child :value-inline))
+			 (widget-get widget :children))))
+(defun widget-editable-list-validate (widget)
+;; All the chilren must be valid.
+(let ((children (widget-get widget :children))
+	child found)
+(while (and children (not found))
+(setq child (car children)
+	    children (cdr children)
+	    found (widget-apply child :validate)))
+found))
+(defun widget-editable-list-match (widget value)
+;; Value must be a list and all the members must match the type.
+(and (listp value)
+(null (cdr (widget-editable-list-match-inline widget value)))))
+(defun widget-editable-list-match-inline (widget value)
+(let ((type (nth 0 (widget-get widget :args)))
+	(ok t)
+	found)
+(while (and value ok)
+(let ((answer (widget-match-inline type value)))
+	(if answer
+	    (setq found (append found (car answer))
+		  value (cdr answer))
+	  (setq ok nil))))
+(cons found value)))
+(defun widget-editable-list-insert-before (widget before)
+;; Insert a new child in the list of children.
+(save-excursion
+(let ((children (widget-get widget :children))
+	  (inhibit-read-only t)
+	  after-change-functions)
+(cond (before
+	     (goto-char (widget-get before :entry-from)))
+	    (t
+	     (goto-char (widget-get widget :value-pos))))
+(let ((child (widget-editable-list-entry-create
+		    widget nil nil)))
+	(when (< (widget-get child :entry-from) (widget-get widget :from))
+	  (set-marker (widget-get widget :from)
+		      (widget-get child :entry-from)))
+	(widget-specify-text (widget-get child :entry-from)
+			     (widget-get child :entry-to))
+	(if (eq (car children) before)
+	    (widget-put widget :children (cons child children))
+	  (while (not (eq (car (cdr children)) before))
+	    (setq children (cdr children)))
+	  (setcdr children (cons child (cdr children)))))))
+(widget-setup)
+(widget-apply widget :notify widget))
+(defun widget-editable-list-delete-at (widget child)
+;; Delete child from list of children.
+(save-excursion
+(let ((buttons (copy-list (widget-get widget :buttons)))
+	  button
+	  (inhibit-read-only t)
+	  after-change-functions)
+(while buttons
+	(setq button (car buttons)
+	      buttons (cdr buttons))
+	(when (eq (widget-get button :widget) child)
+	  (widget-put widget
+		      :buttons (delq button (widget-get widget :buttons)))
+	  (widget-delete button))))
+(let ((entry-from (widget-get child :entry-from))
+	  (entry-to (widget-get child :entry-to))
+	  (inhibit-read-only t)
+	  after-change-functions)
+(widget-delete child)
+(delete-region entry-from entry-to)
+(set-marker entry-from nil)
+(set-marker entry-to nil))
+(widget-put widget :children (delq child (widget-get widget :children))))
+(widget-setup)
+(widget-apply widget :notify widget))
+(defun widget-editable-list-entry-create (widget value conv)
+;; Create a new entry to the list.
+(let ((type (nth 0 (widget-get widget :args)))
+	(widget-push-button-gui widget-editable-list-gui)
+	child delete insert)
+(widget-specify-insert
+(save-excursion
+(and (widget-get widget :indent)
+	    (insert-char ?  (widget-get widget :indent)))
+(insert (widget-get widget :entry-format)))
+;; Parse % escapes in format.
+(while (re-search-forward "%\\(.\\)" nil t)
+(let ((escape (aref (match-string 1) 0)))
+	 (replace-match "" t t)
+	 (cond ((eq escape ?%)
+		(insert "%"))
+	       ((eq escape ?i)
+		(setq insert (widget-create-child-and-convert
+			      widget 'insert-button)))
+	       ((eq escape ?d)
+		(setq delete (widget-create-child-and-convert
+			      widget 'delete-button)))
+	       ((eq escape ?v)
+		(if conv
+		    (setq child (widget-create-child-value
+				 widget type value))
+		  (setq child (widget-create-child widget type))))
+	       (t
+		(error "Unknown escape `%c'" escape)))))
+(widget-put widget
+		 :buttons (cons delete
+				(cons insert
+				      (widget-get widget :buttons))))
+(let ((entry-from (copy-marker (point-min)))
+	   (entry-to (copy-marker (point-max))))
+(widget-specify-text entry-from entry-to)
+(set-marker-insertion-type entry-from t)
+(set-marker-insertion-type entry-to nil)
+(widget-put child :entry-from entry-from)
+(widget-put child :entry-to entry-to)))
+(widget-put insert :widget child)
+(widget-put delete :widget child)
+child))
+;;; The `group' Widget.
+(define-widget 'group 'default
+"A widget which group other widgets inside."
+:convert-widget 'widget-types-convert-widget
+:format "%v"
+:value-create 'widget-group-value-create
+:value-delete 'widget-children-value-delete
+:value-get 'widget-editable-list-value-get
+:validate 'widget-editable-list-validate
+:match 'widget-group-match
+:match-inline 'widget-group-match-inline)
+(defun widget-group-value-create (widget)
+;; Create each component.
+(let ((args (widget-get widget :args))
+	(value (widget-get widget :value))
+	arg answer children)
+(while args
+(setq arg (car args)
+	    args (cdr args)
+	    answer (widget-match-inline arg value)
+	    value (cdr answer))
+(and (eq (preceding-char) ?\n)
+	   (widget-get widget :indent)
+	   (insert-char ?  (widget-get widget :indent)))
+(push (cond ((null answer)
+		   (widget-create-child widget arg))
+		  ((widget-get arg :inline)
+		   (widget-create-child-value widget arg  (car answer)))
+		  (t
+		   (widget-create-child-value widget arg  (car (car answer)))))
+	    children))
+(widget-put widget :children (nreverse children))))
+(defun widget-group-match (widget values)
+;; Match if the components match.
+(and (listp values)
+(let ((match (widget-group-match-inline widget values)))
+	 (and match (null (cdr match))))))
+(defun widget-group-match-inline (widget vals)
+;; Match if the components match.
+(let ((args (widget-get widget :args))
+	argument answer found)
+(while args
+(setq argument (car args)
+	    args (cdr args)
+	    answer (widget-match-inline argument vals))
+(if answer
+	  (setq vals (cdr answer)
+		found (append found (car answer)))
+	(setq vals nil
+	      args nil)))
+(if answer
+	(cons found vals)
+nil)))
+;;; The `widget-help' Widget.
+(define-widget 'widget-help 'push-button
+"The widget documentation button."
+:format "%[[%t]%] %d"
+:help-echo "Push me to toggle the documentation."
+:action 'widget-help-action)
+(defun widget-help-action (widget &optional event)
+"Toggle documentation for WIDGET."
+(let ((old (widget-get widget :doc))
+	(new (widget-get widget :widget-doc)))
+(widget-put widget :doc new)
+(widget-put widget :widget-doc old))
+(widget-value-set widget (widget-value widget)))
+;;; The Sexp Widgets.
+(define-widget 'const 'item
+"An immutable sexp."
+:format "%t\n%d")
+(define-widget 'function-item 'item
+"An immutable function name."
+:format "%v\n%h"
+:documentation-property (lambda (symbol)
+			    (condition-case nil
+				(documentation symbol t)
+			      (error nil))))
+(define-widget 'variable-item 'item
+"An immutable variable name."
+:format "%v\n%h"
+:documentation-property 'variable-documentation)
+(define-widget 'string 'editable-field
+"A string"
+:tag "String"
+:format "%[%t%]: %v")
+(define-widget 'regexp 'string
+"A regular expression."
+;; Should do validation.
+:tag "Regexp")
+(define-widget 'file 'string
+"A file widget.
+It will read a file name from the minibuffer when activated."
+:format "%[%t%]: %v"
+:tag "File"
+:action 'widget-file-action)
+(defun widget-file-action (widget &optional event)
+;; Read a file name from the minibuffer.
+(let* ((value (widget-value widget))
+	 (dir (file-name-directory value))
+	 (file (file-name-nondirectory value))
+	 (menu-tag (widget-apply widget :menu-tag-get))
+	 (must-match (widget-get widget :must-match))
+	 (answer (read-file-name (concat menu-tag ": (defalt `" value "') ")
+				 dir nil must-match file)))
+(widget-value-set widget (abbreviate-file-name answer))
+(widget-apply widget :notify widget event)
+(widget-setup)))
+(define-widget 'directory 'file
+"A directory widget.
+It will read a directory name from the minibuffer when activated."
+:tag "Directory")
+(define-widget 'symbol 'string
+"A lisp symbol."
+:value nil
+:tag "Symbol"
+:match (lambda (widget value) (symbolp value))
+:value-to-internal (lambda (widget value)
+		       (if (symbolp value)
+			   (symbol-name value)
+			 value))
+:value-to-external (lambda (widget value)
+		       (if (stringp value)
+			   (intern value)
+			 value)))
+(define-widget 'function 'sexp
+;; Should complete on functions.
+"A lisp function."
+:tag "Function")
+(define-widget 'variable 'symbol
+;; Should complete on variables.
+"A lisp variable."
+:tag "Variable")
+(define-widget 'sexp 'string
+"An arbitrary lisp expression."
+:tag "Lisp expression"
+:value nil
+:validate 'widget-sexp-validate
+:match (lambda (widget value) t)
+:value-to-internal 'widget-sexp-value-to-internal
+:value-to-external (lambda (widget value) (read value)))
+(defun widget-sexp-value-to-internal (widget value)
+;; Use pp for printer representation.
+(let ((pp (pp-to-string value)))
+(while (string-match "\n\\'" pp)
+(setq pp (substring pp 0 -1)))
+(if (or (string-match "\n\\'" pp)
+	    (> (length pp) 40))
+	(concat "\n" pp)
+pp)))
+(defun widget-sexp-validate (widget)
+;; Valid if we can read the string and there is no junk left after it.
+(save-excursion
+(let ((buffer (set-buffer (get-buffer-create " *Widget Scratch*"))))
+(erase-buffer)
+(insert (widget-apply widget :value-get))
+(goto-char (point-min))
+(condition-case data
+	  (let ((value (read buffer)))
+	    (if (eobp)
+		(if (widget-apply widget :match value)
+		    nil
+		  (widget-put widget :error (widget-get widget :type-error))
+		  widget)
+	      (widget-put widget
+			  :error (format "Junk at end of expression: %s"
+					 (buffer-substring (point)
+							   (point-max))))
+	      widget))
+	(error (widget-put widget :error (error-message-string data))
+	       widget)))))
+(define-widget 'integer 'sexp
+"An integer."
+:tag "Integer"
+:value 0
+:type-error "This field should contain an integer"
+:value-to-internal (lambda (widget value)
+		       (if (integerp value)
+			   (prin1-to-string value)
+			 value))
+:match (lambda (widget value) (integerp value)))
+(define-widget 'character 'string
+"An character."
+:tag "Character"
+:value 0
+:size 1
+:format "%{%t%}: %v\n"
+:type-error "This field should contain a character"
+:value-to-internal (lambda (widget value)
+		       (if (integerp value)
+			   (char-to-string value)
+			 value))
+:value-to-external (lambda (widget value)
+		       (if (stringp value)
+			   (aref value 0)
+			 value))
+:match (lambda (widget value) (integerp value)))
+(define-widget 'number 'sexp
+"A floating point number."
+:tag "Number"
+:value 0.0
+:type-error "This field should contain a number"
+:value-to-internal (lambda (widget value)
+		       (if (numberp value)
+			   (prin1-to-string value)
+			 value))
+:match (lambda (widget value) (numberp value)))
+(define-widget 'list 'group
+"A lisp list."
+:tag "List"
+:format "%{%t%}:\n%v")
+(define-widget 'vector 'group
+"A lisp vector."
+:tag "Vector"
+:format "%{%t%}:\n%v"
+:match 'widget-vector-match
+:value-to-internal (lambda (widget value) (append value nil))
+:value-to-external (lambda (widget value) (apply 'vector value)))
+(defun widget-vector-match (widget value)
+(and (vectorp value)
+(widget-group-match widget
+			   (widget-apply :value-to-internal widget value))))
+(define-widget 'cons 'group
+"A cons-cell."
+:tag "Cons-cell"
+:format "%{%t%}:\n%v"
+:match 'widget-cons-match
+:value-to-internal (lambda (widget value)
+		       (list (car value) (cdr value)))
+:value-to-external (lambda (widget value)
+		       (cons (nth 0 value) (nth 1 value))))
+(defun widget-cons-match (widget value)
+(and (consp value)
+(widget-group-match widget
+			   (widget-apply widget :value-to-internal value))))
+(define-widget 'choice 'menu-choice
+"A union of several sexp types."
+:tag "Choice"
+:format "%[%t%]: %v")
+(define-widget 'radio 'radio-button-choice
+"A union of several sexp types."
+:tag "Choice"
+:format "%{%t%}:\n%v")
+(define-widget 'repeat 'editable-list
+"A variable length homogeneous list."
+:tag "Repeat"
+:format "%{%t%}:\n%v%i\n")
+(define-widget 'set 'checklist
+"A list of members from a fixed set."
+:tag "Set"
+:format "%{%t%}:\n%v")
+(define-widget 'boolean 'toggle
+"To be nil or non-nil, that is the question."
+:tag "Boolean"
+:format "%{%t%}: %[%v%]\n")
+;;; The `color' Widget.
+(define-widget 'color-item 'choice-item
+"A color name (with sample)."
+:format "%v (%[sample%])\n"
+:button-face-get 'widget-color-item-button-face-get)
+(defun widget-color-item-button-face-get (widget)
+;; We create a face from the value.
+(require 'facemenu)
+(condition-case nil
+(facemenu-get-face (intern (concat "fg:" (widget-value widget))))
+(error 'default)))
+(define-widget 'color 'push-button
+"Choose a color name (with sample)."
+:format "%[%t%]: %v"
+:tag "Color"
+:value "default"
+:value-create 'widget-color-value-create
+:value-delete 'widget-children-value-delete
+:value-get 'widget-color-value-get
+:value-set 'widget-color-value-set
+:action 'widget-color-action
+:match 'widget-field-match
+:tag "Color")
+(defvar widget-color-choice-list nil)
+;; Variable holding the possible colors.
+(defun widget-color-choice-list ()
+(unless widget-color-choice-list
+(setq widget-color-choice-list
+	  (mapcar '(lambda (color) (list color))
+		  (x-defined-colors))))
+widget-color-choice-list)
+(defun widget-color-value-create (widget)
+(let ((child (widget-create-child-and-convert
+		widget 'color-item (widget-get widget :value))))
+(widget-put widget :children (list child))))
+(defun widget-color-value-get (widget)
+;; Pass command to first child.
+(widget-apply (car (widget-get widget :children)) :value-get))
+(defun widget-color-value-set (widget value)
+;; Pass command to first child.
+(widget-apply (car (widget-get widget :children)) :value-set value))
+(defvar widget-color-history nil
+"History of entered colors")
+(defun widget-color-action (widget &optional event)
+;; Prompt for a color.
+(let* ((tag (widget-apply widget :menu-tag-get))
+	 (prompt (concat tag ": "))
+	 (answer (cond ((string-match "XEmacs" emacs-version)
+			(read-color prompt))
+		       ((fboundp 'x-defined-colors)
+			(completing-read (concat tag ": ")
+					 (widget-color-choice-list)
+					 nil nil nil 'widget-color-history))
+		       (t
+			(read-string prompt (widget-value widget))))))
+(unless (zerop (length answer))
+(widget-value-set widget answer)
+(widget-apply widget :notify widget event)
+(widget-setup))))
+;;; The Help Echo
+(defun widget-echo-help-mouse ()
+"Display the help message for the widget under the mouse.
+Enable with (run-with-idle-timer 1 t 'widget-echo-help-mouse)"
+(let* ((pos (mouse-position))
+	 (frame (car pos))
+	 (x (car (cdr pos)))
+	 (y (cdr (cdr pos)))
+	 (win (window-at x y frame))
+	 (where (coordinates-in-window-p (cons x y) win)))
+(when (consp where)
+(save-window-excursion
+	(progn ; save-excursion
+	  (select-window win)
+	  (let* ((result (compute-motion (window-start win)
+					 '(0 . 0)
+					 (window-end win)
+					 where
+					 (window-width win)
+					 (cons (window-hscroll) 0)
+					 win)))
+	    (when (and (eq (nth 1 result) x)
+		       (eq (nth 2 result) y))
+	      (widget-echo-help (nth 0 result))))))))
+(unless track-mouse
+(setq track-mouse t)
+(add-hook 'post-command-hook 'widget-stop-mouse-tracking)))
+(defun widget-stop-mouse-tracking (&rest args)
+"Stop the mouse tracking done while idle."
+(remove-hook 'post-command-hook 'widget-stop-mouse-tracking)
+(setq track-mouse nil))
+(defun widget-at (pos)
+"The button or field at POS."
+(or (get-text-property pos 'button)
+(get-text-property pos 'field)))
+(defun widget-echo-help (pos)
+"Display the help echo for widget at POS."
+(let* ((widget (widget-at pos))
+	 (help-echo (and widget (widget-get widget :help-echo))))
+(cond ((stringp help-echo)
+	   (message "%s" help-echo))
+	  ((and (symbolp help-echo) (fboundp help-echo)
+		(stringp (setq help-echo (funcall help-echo widget))))
+	   (message "%s" help-echo)))))
+;;; The End:
+(provide 'wid-edit)
+;; wid-edit.el ends here

Mercurial > hg > xemacs-beta

comparison lisp/custom/wid-edit.el @ 28:1917ad0d78d7 r19-15b97