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+;;; wid-browse.el --- Functions for browsing widgets.
+;;
+;; Copyright (C) 1997 Free Software Foundation, Inc.
+;;
+;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
+;; Keywords: extensions
+;; Version: 1.71
+;; X-URL: http://www.dina.kvl.dk/~abraham/custom/
+
+;;; Commentary:
+;;
+;; Widget browser.  See `widget.el'.
+
+;;; Code:
+
+(require 'easymenu)
+(require 'custom)
+(require 'wid-edit)
+(require 'cl)
+
+(defgroup widget-browse nil
+  "Customization support for browsing widgets."
+  :group 'widgets)
+
+;;; The Mode.
+
+(defvar widget-browse-mode-map nil
+  "Keymap for `widget-browse-mode'.")
+  
+(unless widget-browse-mode-map
+  (setq widget-browse-mode-map (make-sparse-keymap))
+  (set-keymap-parent widget-browse-mode-map widget-keymap))
+
+(easy-menu-define widget-browse-mode-menu 
+    widget-browse-mode-map
+  "Menu used in widget browser buffers."
+  '("Widget"
+    ["Browse" widget-browse t]
+    ["Browse At" widget-browse-at t]))
+
+(defcustom widget-browse-mode-hook nil
+  "Hook called when entering widget-browse-mode."
+  :type 'hook
+  :group 'widget-browse)
+
+(defun widget-browse-mode ()
+  "Major mode for widget browser buffers.
+
+The following commands are available:
+
+\\[widget-forward]		Move to next button or editable field.
+\\[widget-backward]		Move to previous button or editable field.
+\\[widget-button-click]		Activate button under the mouse pointer.
+\\[widget-button-press]		Activate button under point.
+
+Entry to this mode calls the value of `widget-browse-mode-hook'
+if that value is non-nil."
+  (kill-all-local-variables)
+  (setq major-mode 'widget-browse-mode
+	mode-name "Widget")
+  (use-local-map widget-browse-mode-map)
+  (easy-menu-add widget-browse-mode-menu)
+  (run-hooks 'widget-browse-mode-hook))
+
+;;; Commands.
+
+;;;###autoload
+(defun widget-browse-at (pos)
+  "Browse the widget under point."
+  (interactive "d")
+  (let* ((field (get-text-property pos 'field))
+	 (button (get-text-property pos 'button))
+	 (doc (get-text-property pos 'widget-doc))
+	 (text (cond (field "This is an editable text area.")
+		     (button "This is an active area.")
+		     (doc "This is documentation text.")
+		     (t "This is unidentified text.")))
+	 (widget (or field button doc)))
+    (when widget
+      (widget-browse widget))
+    (message text)))
+
+(defvar widget-browse-history nil)
+
+(defun widget-browse (widget)
+  "Create a widget browser for WIDGET."
+  (interactive (list (completing-read "Widget: " 
+				      obarray
+				      (lambda (symbol)
+					(get symbol 'widget-type))
+				      t nil 'widget-browse-history)))
+  (if (stringp widget)
+      (setq widget (intern widget)))
+  (unless (if (symbolp widget)
+	      (get widget 'widget-type)
+	    (and (consp widget)
+		 (get (widget-type widget) 'widget-type)))
+    (error "Not a widget."))
+  ;; Create the buffer.
+  (if (symbolp widget)
+      (let ((buffer (format "*Browse %s Widget*" widget)))
+	(kill-buffer (get-buffer-create buffer))
+	(switch-to-buffer (get-buffer-create buffer)))
+    (kill-buffer (get-buffer-create "*Browse Widget*"))
+    (switch-to-buffer (get-buffer-create "*Browse Widget*")))
+  (widget-browse-mode)
+  
+  ;; Quick way to get out.
+  (widget-create 'push-button
+		 :action (lambda (widget &optional event)
+			   (bury-buffer))
+		 "Quit")
+  (widget-insert "\n")
+
+  ;; Top text indicating whether it is a class or object browser.
+  (if (listp widget)
+      (widget-insert "Widget object browser.\n\nClass: ")
+    (widget-insert "Widget class browser.\n\n")
+    (widget-create 'widget-browse
+		   :format "%[%v%]\n%d"
+		   :doc (get widget 'widget-documentation)
+		   widget)
+    (unless (eq (preceding-char) ?\n)
+      (widget-insert "\n"))
+    (widget-insert "\nSuper: ")
+    (setq widget (get widget 'widget-type)))
+
+  ;; Now show the attributes.
+  (let ((name (car widget))
+	(items (cdr widget))
+	key value printer)
+    (widget-create 'widget-browse
+		   :format "%[%v%]"
+		   name)
+    (widget-insert "\n")
+    (while items
+      (setq key (nth 0 items)
+	    value (nth 1 items)
+	    printer (or (get key 'widget-keyword-printer)
+			'widget-browse-sexp)
+	    items (cdr (cdr items)))
+      (widget-insert "\n" (symbol-name key) "\n\t")
+      (funcall printer widget key value)
+      (widget-insert "\n")))
+  (widget-setup)
+  (goto-char (point-min)))
+
+;;; The `widget-browse' Widget.
+
+(define-widget 'widget-browse 'push-button
+  "Button for creating a widget browser.
+The :value of the widget shuld be the widget to be browsed."
+  :format "%[[%v]%]"
+  :value-create 'widget-browse-value-create
+  :action 'widget-browse-action)
+
+(defun widget-browse-action (widget &optional event)
+  ;; Create widget browser for WIDGET's :value. 
+  (widget-browse (widget-get widget :value)))
+
+(defun widget-browse-value-create (widget)
+  ;; Insert type name.
+  (let ((value (widget-get widget :value)))
+    (cond ((symbolp value)
+	   (insert (symbol-name value)))
+	  ((consp value)
+	   (insert (symbol-name (widget-type value))))
+	  (t
+	   (insert "strange")))))
+
+;;; Keyword Printer Functions.
+
+(defun widget-browse-widget (widget key value)
+  "Insert description of WIDGET's KEY VALUE.
+VALUE is assumed to be a widget."
+  (widget-create 'widget-browse value))
+
+(defun widget-browse-widgets (widget key value)
+  "Insert description of WIDGET's KEY VALUE.
+VALUE is assumed to be a list of widgets."
+  (while value
+    (widget-create 'widget-browse
+		   (car value))
+    (setq value (cdr value))
+    (when value
+      (widget-insert " "))))
+
+(defun widget-browse-sexp (widget key value)
+  "Insert description of WIDGET's KEY VALUE.
+Nothing is assumed about value."
+  (let ((pp (condition-case signal
+		(pp-to-string value)
+	      (error (prin1-to-string signal)))))
+    (when (string-match "\n\\'" pp)
+      (setq pp (substring pp 0 (1- (length pp)))))
+    (if (cond ((string-match "\n" pp)
+	       nil)
+	      ((> (length pp) (- (window-width) (current-column)))
+	       nil)
+	      (t t))
+	(widget-insert pp)
+      (widget-create 'push-button
+		     :tag "show"
+		     :action (lambda (widget &optional event)
+			       (with-output-to-temp-buffer
+				   "*Pp Eval Output*"
+				 (princ (widget-get widget :value))))
+		     pp))))
+
+(defun widget-browse-sexps (widget key value)
+  "Insert description of WIDGET's KEY VALUE.
+VALUE is assumed to be a list of widgets."
+  (let ((target (current-column)))
+    (while value
+      (widget-browse-sexp widget key (car value))
+      (setq value (cdr value))
+      (when value
+	(widget-insert "\n" (make-string target ?\ ))))))
+
+;;; Keyword Printers.
+
+(put :parent 'widget-keyword-printer 'widget-browse-widget)
+(put :children 'widget-keyword-printer 'widget-browse-widgets)
+(put :buttons 'widget-keyword-printer 'widget-browse-widgets)
+(put :button 'widget-keyword-printer 'widget-browse-widget)
+(put :args 'widget-keyword-printer 'widget-browse-sexps)
+
+;;; The End:
+
+(provide 'wid-browse)
+
+;; wid-browse.el ends here