lisp/wid-browse.el

   1 ;;; wid-browse.el --- functions for browsing widgets
   2 ;;
   3 ;; Copyright (C) 1997 Free Software Foundation, Inc.
   4 ;;
   5 ;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
   6 ;; Keywords: extensions
   7 ;; Version: 1.9914
   8 ;; X-URL: http://www.dina.kvl.dk/~abraham/custom/
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 2, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  25 ;; Boston, MA 02111-1307, USA.
  26
  27 ;;; Commentary:
  28 ;;
  29 ;; Widget browser.  See `widget.el'.
  30
  31 ;;; Code:
  32
  33 (require 'easymenu)
  34 (require 'custom)
  35 (require 'wid-edit)
  36 (eval-when-compile (require 'cl))
  37
  38 (defgroup widget-browse nil
  39   "Customization support for browsing widgets."
  40   :group 'widgets)
  41
  42 ;;; The Mode.
  43
  44 (defvar widget-browse-mode-map nil
  45   "Keymap for `widget-browse-mode'.")
  46
  47 (unless widget-browse-mode-map
  48   (setq widget-browse-mode-map (make-sparse-keymap))
  49   (set-keymap-parent widget-browse-mode-map widget-keymap)
  50   (define-key widget-browse-mode-map "q" 'bury-buffer))
  51
  52 (easy-menu-define widget-browse-mode-customize-menu
  53     widget-browse-mode-map
  54   "Menu used in widget browser buffers."
  55   (customize-menu-create 'widgets))
  56
  57 (easy-menu-define widget-browse-mode-menu
  58     widget-browse-mode-map
  59   "Menu used in widget browser buffers."
  60   '("Widget"
  61     ["Browse" widget-browse t]
  62     ["Browse At" widget-browse-at t]))
  63
  64 (defcustom widget-browse-mode-hook nil
  65   "Hook called when entering widget-browse-mode."
  66   :type 'hook
  67   :group 'widget-browse)
  68
  69 (defun widget-browse-mode ()
  70   "Major mode for widget browser buffers.
  71
  72 The following commands are available:
  73
  74 \\[widget-forward]              Move to next button or editable field.
  75 \\[widget-backward]             Move to previous button or editable field.
  76 \\[widget-button-click]         Activate button under the mouse pointer.
  77 \\[widget-button-press]         Activate button under point.
  78
  79 Entry to this mode calls the value of `widget-browse-mode-hook'
  80 if that value is non-nil."
  81   (kill-all-local-variables)
  82   (setq major-mode 'widget-browse-mode
  83         mode-name "Widget")
  84   (use-local-map widget-browse-mode-map)
  85   (easy-menu-add widget-browse-mode-customize-menu)
  86   (easy-menu-add widget-browse-mode-menu)
  87   (run-hooks 'widget-browse-mode-hook))
  88
  89 (put 'widget-browse-mode 'mode-class 'special)
  90
  91 ;;; Commands.
  92
  93 ;;;###autoload
  94 (defun widget-browse-at (pos)
  95   "Browse the widget under point."
  96   (interactive "d")
  97   (let* ((field (get-char-property pos 'field))
  98          (button (get-char-property pos 'button))
  99          (doc (get-char-property pos 'widget-doc))
 100          (text (cond (field "This is an editable text area.")
 101                      (button "This is an active area.")
 102                      (doc "This is documentation text.")
 103                      (t "This is unidentified text.")))
 104          (widget (or field button doc)))
 105     (when widget
 106       (widget-browse widget))
 107     (message text)))
 108
 109 (defvar widget-browse-history nil)
 110
 111 ;;;###autoload
 112 (defun widget-browse (widget)
 113   "Create a widget browser for WIDGET."
 114   (interactive (list (completing-read "Widget: "
 115                                       obarray
 116                                       (lambda (symbol)
 117                                         (get symbol 'widget-type))
 118                                       t nil 'widget-browse-history)))
 119   (if (stringp widget)
 120       (setq widget (intern widget)))
 121   (unless (if (symbolp widget)
 122               (get widget 'widget-type)
 123             (and (consp widget)
 124                  (get (widget-type widget) 'widget-type)))
 125     (error "Not a widget"))
 126   ;; Create the buffer.
 127   (if (symbolp widget)
 128       (let ((buffer (format "*Browse %s Widget*" widget)))
 129         (kill-buffer (get-buffer-create buffer))
 130         (switch-to-buffer (get-buffer-create buffer)))
 131     (kill-buffer (get-buffer-create "*Browse Widget*"))
 132     (switch-to-buffer (get-buffer-create "*Browse Widget*")))
 133   (widget-browse-mode)
 134
 135   ;; Quick way to get out.
 136 ;;  (widget-create 'push-button
 137 ;;               :action (lambda (widget &optional event)
 138 ;;                         (bury-buffer))
 139 ;;               "Quit")
 140 ;;  (widget-insert "\n")
 141
 142   ;; Top text indicating whether it is a class or object browser.
 143   (if (listp widget)
 144       (widget-insert "Widget object browser.\n\nClass: ")
 145     (widget-insert "Widget class browser.\n\n")
 146     (widget-create 'widget-browse
 147                    :format "%[%v%]\n%d"
 148                    :doc (get widget 'widget-documentation)
 149                    widget)
 150     (unless (eq (preceding-char) ?\n)
 151       (widget-insert "\n"))
 152     (widget-insert "\nSuper: ")
 153     (setq widget (get widget 'widget-type)))
 154
 155   ;; Now show the attributes.
 156   (let ((name (car widget))
 157         (items (cdr widget))
 158         key value printer)
 159     (widget-create 'widget-browse
 160                    :format "%[%v%]"
 161                    name)
 162     (widget-insert "\n")
 163     (while items
 164       (setq key (nth 0 items)
 165             value (nth 1 items)
 166             printer (or (get key 'widget-keyword-printer)
 167                         'widget-browse-sexp)
 168             items (cdr (cdr items)))
 169       (widget-insert "\n" (symbol-name key) "\n\t")
 170       (funcall printer widget key value)
 171       (widget-insert "\n")))
 172   (widget-setup)
 173   (goto-char (point-min)))
 174
 175 ;;;###autoload
 176 (defun widget-browse-other-window (&optional widget)
 177   "Show widget browser for WIDGET in other window."
 178   (interactive)
 179   (let ((window (selected-window)))
 180     (switch-to-buffer-other-window "*Browse Widget*")
 181     (if widget
 182         (widget-browse widget)
 183       (call-interactively 'widget-browse))
 184     (select-window window)))
 185
 186
 187 ;;; The `widget-browse' Widget.
 188
 189 (define-widget 'widget-browse 'push-button
 190   "Button for creating a widget browser.
 191 The :value of the widget shuld be the widget to be browsed."
 192   :format "%[[%v]%]"
 193   :value-create 'widget-browse-value-create
 194   :action 'widget-browse-action)
 195
 196 (defun widget-browse-action (widget &optional event)
 197   ;; Create widget browser for WIDGET's :value.
 198   (widget-browse (widget-get widget :value)))
 199
 200 (defun widget-browse-value-create (widget)
 201   ;; Insert type name.
 202   (let ((value (widget-get widget :value)))
 203     (cond ((symbolp value)
 204            (insert (symbol-name value)))
 205           ((consp value)
 206            (insert (symbol-name (widget-type value))))
 207           (t
 208            (insert "strange")))))
 209
 210 ;;; Keyword Printer Functions.
 211
 212 (defun widget-browse-widget (widget key value)
 213   "Insert description of WIDGET's KEY VALUE.
 214 VALUE is assumed to be a widget."
 215   (widget-create 'widget-browse value))
 216
 217 (defun widget-browse-widgets (widget key value)
 218   "Insert description of WIDGET's KEY VALUE.
 219 VALUE is assumed to be a list of widgets."
 220   (while value
 221     (widget-create 'widget-browse
 222                    (car value))
 223     (setq value (cdr value))
 224     (when value
 225       (widget-insert " "))))
 226
 227 (defun widget-browse-sexp (widget key value)
 228   "Insert description of WIDGET's KEY VALUE.
 229 Nothing is assumed about value."
 230   (let ((pp (condition-case signal
 231                 (pp-to-string value)
 232               (error (prin1-to-string signal)))))
 233     (when (string-match "\n\\'" pp)
 234       (setq pp (substring pp 0 (1- (length pp)))))
 235     (if (cond ((string-match "\n" pp)
 236                nil)
 237               ((> (length pp) (- (window-width) (current-column)))
 238                nil)
 239               (t t))
 240         (widget-insert pp)
 241       (widget-create 'push-button
 242                      :tag "show"
 243                      :action (lambda (widget &optional event)
 244                                (with-output-to-temp-buffer
 245                                    "*Pp Eval Output*"
 246                                  (princ (widget-get widget :value))))
 247                      pp))))
 248
 249 (defun widget-browse-sexps (widget key value)
 250   "Insert description of WIDGET's KEY VALUE.
 251 VALUE is assumed to be a list of widgets."
 252   (let ((target (current-column)))
 253     (while value
 254       (widget-browse-sexp widget key (car value))
 255       (setq value (cdr value))
 256       (when value
 257         (widget-insert "\n" (make-string target ?\ ))))))
 258
 259 ;;; Keyword Printers.
 260
 261 (put :parent 'widget-keyword-printer 'widget-browse-widget)
 262 (put :children 'widget-keyword-printer 'widget-browse-widgets)
 263 (put :buttons 'widget-keyword-printer 'widget-browse-widgets)
 264 (put :button 'widget-keyword-printer 'widget-browse-widget)
 265 (put :args 'widget-keyword-printer 'widget-browse-sexps)
 266
 267 ;;; Widget Minor Mode.
 268
 269 (defvar widget-minor-mode nil
 270   "I non-nil, we are in Widget Minor Mode.")
 271   (make-variable-buffer-local 'widget-minor-mode)
 272
 273 (defvar widget-minor-mode-map nil
 274   "Keymap used in Widget Minor Mode.")
 275
 276 (unless widget-minor-mode-map
 277   (setq widget-minor-mode-map (make-sparse-keymap))
 278   (set-keymap-parent widget-minor-mode-map widget-keymap))
 279
 280 ;;;###autoload
 281 (defun widget-minor-mode (&optional arg)
 282   "Togle minor mode for traversing widgets.
 283 With arg, turn widget mode on if and only if arg is positive."
 284   (interactive "P")
 285   (cond ((null arg)
 286          (setq widget-minor-mode (not widget-minor-mode)))
 287         ((<= arg 0)
 288          (setq widget-minor-mode nil))
 289         (t
 290          (setq widget-minor-mode t)))
 291   (force-mode-line-update))
 292
 293 (add-to-list 'minor-mode-alist '(widget-minor-mode " Widget"))
 294
 295 (add-to-list 'minor-mode-map-alist
 296              (cons 'widget-minor-mode widget-minor-mode-map))
 297
 298 ;;; The End:
 299
 300 (provide 'wid-browse)
 301
 302 ;;; wid-browse.el ends here