lisp/wid-browse.el

   1 ;;; wid-browse.el --- functions for browsing widgets
   2 ;;
   3 ;; Copyright (C) 1997, 2001, 2002, 2003, 2004, 2005,
   4 ;;   2006, 2007 Free Software Foundation, Inc.
   5 ;;
   6 ;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
   7 ;; Keywords: extensions
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27 ;;
  28 ;; Widget browser.  See `widget.el'.
  29
  30 ;;; Code:
  31
  32 (require 'easymenu)
  33 (require 'custom)
  34 (require 'wid-edit)
  35 (eval-when-compile (require 'cl))
  36
  37 (defgroup widget-browse nil
  38   "Customization support for browsing widgets."
  39   :group 'widgets)
  40
  41 ;;; The Mode.
  42
  43 (defvar widget-browse-mode-map nil
  44   "Keymap for `widget-browse-mode'.")
  45
  46 (unless widget-browse-mode-map
  47   (setq widget-browse-mode-map (make-sparse-keymap))
  48   (set-keymap-parent widget-browse-mode-map widget-keymap)
  49   (define-key widget-browse-mode-map "q" 'bury-buffer))
  50
  51 (easy-menu-define widget-browse-mode-customize-menu
  52     widget-browse-mode-map
  53   "Menu used in widget browser buffers."
  54   (customize-menu-create 'widgets))
  55
  56 (easy-menu-define widget-browse-mode-menu
  57     widget-browse-mode-map
  58   "Menu used in widget browser buffers."
  59   '("Widget"
  60     ["Browse" widget-browse t]
  61     ["Browse At" widget-browse-at t]))
  62
  63 (defcustom widget-browse-mode-hook nil
  64   "Hook called when entering widget-browse-mode."
  65   :type 'hook
  66   :group 'widget-browse)
  67
  68 (defun widget-browse-mode ()
  69   "Major mode for widget browser buffers.
  70
  71 The following commands are available:
  72
  73 \\[widget-forward]              Move to next button or editable field.
  74 \\[widget-backward]             Move to previous button or editable field.
  75 \\[widget-button-click]         Activate button under the mouse pointer.
  76 \\[widget-button-press]         Activate button under point.
  77
  78 Entry to this mode calls the value of `widget-browse-mode-hook'
  79 if that value is non-nil."
  80   (kill-all-local-variables)
  81   (setq major-mode 'widget-browse-mode
  82         mode-name "Widget")
  83   (use-local-map widget-browse-mode-map)
  84   (easy-menu-add widget-browse-mode-customize-menu)
  85   (easy-menu-add widget-browse-mode-menu)
  86   (run-mode-hooks 'widget-browse-mode-hook))
  87
  88 (put 'widget-browse-mode 'mode-class 'special)
  89
  90 ;;; Commands.
  91
  92 ;;;###autoload
  93 (defun widget-browse-at (pos)
  94   "Browse the widget under point."
  95   (interactive "d")
  96   (let* ((field (get-char-property pos 'field))
  97          (button (get-char-property pos 'button))
  98          (doc (get-char-property pos 'widget-doc))
  99          (text (cond (field "This is an editable text area.")
 100                      (button "This is an active area.")
 101                      (doc "This is documentation text.")
 102                      (t "This is unidentified text.")))
 103          (widget (or field button doc)))
 104     (when widget
 105       (widget-browse widget))
 106     (message text)))
 107
 108 (defvar widget-browse-history nil)
 109
 110 ;;;###autoload
 111 (defun widget-browse (widget)
 112   "Create a widget browser for WIDGET."
 113   (interactive (list (completing-read "Widget: "
 114                                       obarray
 115                                       (lambda (symbol)
 116                                         (get symbol 'widget-type))
 117                                       t nil 'widget-browse-history)))
 118   (if (stringp widget)
 119       (setq widget (intern widget)))
 120   (unless (if (symbolp widget)
 121               (get widget 'widget-type)
 122             (and (consp widget)
 123                  (get (widget-type widget) 'widget-type)))
 124     (error "Not a widget"))
 125   ;; Create the buffer.
 126   (if (symbolp widget)
 127       (let ((buffer (format "*Browse %s Widget*" widget)))
 128         (kill-buffer (get-buffer-create buffer))
 129         (switch-to-buffer (get-buffer-create buffer)))
 130     (kill-buffer (get-buffer-create "*Browse Widget*"))
 131     (switch-to-buffer (get-buffer-create "*Browse Widget*")))
 132   (widget-browse-mode)
 133
 134   ;; Quick way to get out.
 135 ;;  (widget-create 'push-button
 136 ;;               :action (lambda (widget &optional event)
 137 ;;                         (bury-buffer))
 138 ;;               "Quit")
 139 ;;  (widget-insert "\n")
 140
 141   ;; Top text indicating whether it is a class or object browser.
 142   (if (listp widget)
 143       (widget-insert "Widget object browser.\n\nClass: ")
 144     (widget-insert "Widget class browser.\n\n")
 145     (widget-create 'widget-browse
 146                    :format "%[%v%]\n%d"
 147                    :doc (get widget 'widget-documentation)
 148                    widget)
 149     (unless (eq (preceding-char) ?\n)
 150       (widget-insert "\n"))
 151     (widget-insert "\nSuper: ")
 152     (setq widget (get widget 'widget-type)))
 153
 154   ;; Now show the attributes.
 155   (let ((name (car widget))
 156         (items (cdr widget))
 157         key value printer)
 158     (widget-create 'widget-browse
 159                    :format "%[%v%]"
 160                    name)
 161     (widget-insert "\n")
 162     (while items
 163       (setq key (nth 0 items)
 164             value (nth 1 items)
 165             printer (or (get key 'widget-keyword-printer)
 166                         'widget-browse-sexp)
 167             items (cdr (cdr items)))
 168       (widget-insert "\n" (symbol-name key) "\n\t")
 169       (funcall printer widget key value)
 170       (widget-insert "\n")))
 171   (widget-setup)
 172   (goto-char (point-min)))
 173
 174 ;;;###autoload
 175 (defun widget-browse-other-window (&optional widget)
 176   "Show widget browser for WIDGET in other window."
 177   (interactive)
 178   (let ((window (selected-window)))
 179     (switch-to-buffer-other-window "*Browse Widget*")
 180     (if widget
 181         (widget-browse widget)
 182       (call-interactively 'widget-browse))
 183     (select-window window)))
 184
 185
 186 ;;; The `widget-browse' Widget.
 187
 188 (define-widget 'widget-browse 'push-button
 189   "Button for creating a widget browser.
 190 The :value of the widget shuld be the widget to be browsed."
 191   :format "%[[%v]%]"
 192   :value-create 'widget-browse-value-create
 193   :action 'widget-browse-action)
 194
 195 (defun widget-browse-action (widget &optional event)
 196   ;; Create widget browser for WIDGET's :value.
 197   (widget-browse (widget-get widget :value)))
 198
 199 (defun widget-browse-value-create (widget)
 200   ;; Insert type name.
 201   (let ((value (widget-get widget :value)))
 202     (cond ((symbolp value)
 203            (insert (symbol-name value)))
 204           ((consp value)
 205            (insert (symbol-name (widget-type value))))
 206           (t
 207            (insert "strange")))))
 208
 209 ;;; Keyword Printer Functions.
 210
 211 (defun widget-browse-widget (widget key value)
 212   "Insert description of WIDGET's KEY VALUE.
 213 VALUE is assumed to be a widget."
 214   (widget-create 'widget-browse value))
 215
 216 (defun widget-browse-widgets (widget key value)
 217   "Insert description of WIDGET's KEY VALUE.
 218 VALUE is assumed to be a list of widgets."
 219   (while value
 220     (widget-create 'widget-browse
 221                    (car value))
 222     (setq value (cdr value))
 223     (when value
 224       (widget-insert " "))))
 225
 226 (defun widget-browse-sexp (widget key value)
 227   "Insert description of WIDGET's KEY VALUE.
 228 Nothing is assumed about value."
 229   (let ((pp (condition-case signal
 230                 (pp-to-string value)
 231               (error (prin1-to-string signal)))))
 232     (when (string-match "\n\\'" pp)
 233       (setq pp (substring pp 0 (1- (length pp)))))
 234     (if (cond ((string-match "\n" pp)
 235                nil)
 236               ((> (length pp) (- (window-width) (current-column)))
 237                nil)
 238               (t t))
 239         (widget-insert pp)
 240       (widget-create 'push-button
 241                      :tag "show"
 242                      :action (lambda (widget &optional event)
 243                                (with-output-to-temp-buffer
 244                                    "*Pp Eval Output*"
 245                                  (princ (widget-get widget :value))))
 246                      pp))))
 247
 248 (defun widget-browse-sexps (widget key value)
 249   "Insert description of WIDGET's KEY VALUE.
 250 VALUE is assumed to be a list of widgets."
 251   (let ((target (current-column)))
 252     (while value
 253       (widget-browse-sexp widget key (car value))
 254       (setq value (cdr value))
 255       (when value
 256         (widget-insert "\n" (make-string target ?\ ))))))
 257
 258 ;;; Keyword Printers.
 259
 260 (put :parent 'widget-keyword-printer 'widget-browse-widget)
 261 (put :children 'widget-keyword-printer 'widget-browse-widgets)
 262 (put :buttons 'widget-keyword-printer 'widget-browse-widgets)
 263 (put :button 'widget-keyword-printer 'widget-browse-widget)
 264 (put :args 'widget-keyword-printer 'widget-browse-sexps)
 265
 266 ;;; Widget Minor Mode.
 267
 268 (defvar widget-minor-mode nil
 269   "If non-nil, we are in Widget Minor Mode.")
 270 (make-variable-buffer-local 'widget-minor-mode)
 271
 272 (defvar widget-minor-mode-map nil
 273   "Keymap used in Widget Minor Mode.")
 274
 275 (unless widget-minor-mode-map
 276   (setq widget-minor-mode-map (make-sparse-keymap))
 277   (set-keymap-parent widget-minor-mode-map widget-keymap))
 278
 279 ;;;###autoload
 280 (defun widget-minor-mode (&optional arg)
 281   "Togle minor mode for traversing widgets.
 282 With arg, turn widget mode on if and only if arg is positive."
 283   (interactive "P")
 284   (cond ((null arg)
 285          (setq widget-minor-mode (not widget-minor-mode)))
 286         ((<= arg 0)
 287          (setq widget-minor-mode nil))
 288         (t
 289          (setq widget-minor-mode t)))
 290   (force-mode-line-update))
 291
 292 (add-to-list 'minor-mode-alist '(widget-minor-mode " Widget"))
 293
 294 (add-to-list 'minor-mode-map-alist
 295              (cons 'widget-minor-mode widget-minor-mode-map))
 296
 297 ;;; The End:
 298
 299 (provide 'wid-browse)
 300
 301 ;;; arch-tag: d5ffb18f-8984-4735-8502-edf70456db21
 302 ;;; wid-browse.el ends here