code.delx.au - gnu-emacs/blob - lisp/emacs-lisp/lucid.el

   1 ;;; lucid.el --- emulate some Lucid Emacs functions
   2
   3 ;; Copyright (C) 1993, 1995, 2001 Free Software Foundation, Inc.
   4
   5 ;; Maintainer: FSF
   6 ;; Keywords: emulations
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 ;; XEmacs autoloads CL so we might as well make use of it.
  30 (require 'cl)
  31
  32 (defalias 'current-time-seconds 'current-time)
  33
  34 (defun map-keymap (function keymap &optional sort-first)
  35   "Call FUNCTION for every binding in KEYMAP.
  36 This does not include bindings inherited from a parent keymap.
  37 FUNCTION receives two arguments each time it is called:
  38 the character (more generally, the event type) that is bound,
  39 and the binding it has.
  40
  41 Note that passing the event type directly to `define-key' does not work
  42 in Emacs 19.  We do not emulate that particular feature of Lucid Emacs.
  43 If your code does that, modify it to make a vector containing the event
  44 type that you get.  That will work in both versions of Emacs."
  45   (if sort-first
  46       (let (list)
  47         (cl-map-keymap (lambda (a b) (push (cons a b) list))
  48                        keymap)
  49         (setq list (sort list
  50                          (lambda (a b)
  51                            (setq a (car a) b (car b))
  52                            (if (integerp a)
  53                                (if (integerp b) (< a b)
  54                                  t)
  55                              (if (integerp b) t
  56                                (string< a b))))))
  57         (dolist (p list)
  58           (funcall function (car p) (cdr p))))
  59     (cl-map-keymap function keymap)))
  60
  61 (defun read-number (prompt &optional integers-only)
  62   "Read a number from the minibuffer.
  63 Keep reentering the minibuffer until we get suitable input.
  64 If optional argument INTEGERS-ONLY is non-nil, insist on an integer."
  65   (interactive)
  66   (let (success
  67         (number nil)
  68         (predicate (if integers-only 'integerp 'numberp)))
  69     (while (not success)
  70       (let ((input-string (read-string prompt)))
  71         (condition-case ()
  72             (setq number (read input-string))
  73           (error))
  74         (if (funcall predicate number)
  75             (setq success t)
  76           (let ((cursor-in-echo-area t))
  77             (message "Please type %s"
  78                      (if integers-only "an integer" "a number"))
  79             (sit-for 1)))))
  80     number))
  81
  82 (defun real-path-name (name &optional default)
  83   (file-truename (expand-file-name name default)))
  84
  85 ;; It's not clear what to return if the mouse is not in FRAME.
  86 (defun read-mouse-position (frame)
  87   (let ((pos (mouse-position)))
  88     (if (eq (car pos) frame)
  89         (cdr pos))))
  90
  91 (defun switch-to-other-buffer (arg)
  92   "Switch to the previous buffer.
  93 With a numeric arg N, switch to the Nth most recent buffer.
  94 With an arg of 0, buries the current buffer at the
  95 bottom of the buffer stack."
  96   (interactive "p")
  97   (if (eq arg 0)
  98       (bury-buffer (current-buffer)))
  99   (switch-to-buffer
 100    (if (<= arg 1) (other-buffer (current-buffer))
 101      (nth arg
 102           (apply 'nconc
 103                  (mapcar
 104                   (lambda (buf)
 105                     (if (= ?\  (string-to-char (buffer-name buf)))
 106                         nil
 107                       (list buf)))
 108                   (buffer-list)))))))
 109
 110 (defun device-class (&optional device)
 111   "Return the class (color behavior) of DEVICE.
 112 This will be one of 'color, 'grayscale, or 'mono.
 113 This function exists for compatibility with XEmacs."
 114   (cond
 115    ((display-color-p device) 'color)
 116    ((display-grayscale-p device) 'grayscale)
 117    (t 'mono)))
 118
 119 (defalias 'find-face 'internal-find-face)
 120 (defalias 'get-face 'internal-get-face)
 121 (defalias 'try-face-font 'internal-try-face-font)
 122
 123 (defalias 'exec-to-string 'shell-command-to-string)
 124 \f
 125
 126 ;; Buffer context
 127
 128 (defun buffer-syntactic-context (&optional buffer)
 129   "Syntactic context at point in BUFFER.
 130 Either of `string', `comment' or `nil'.
 131 This is an XEmacs compatibility function."
 132   (with-current-buffer (or buffer (current-buffer))
 133     (let ((state (syntax-ppss (point))))
 134       (cond
 135        ((nth 3 state) 'string)
 136        ((nth 4 state) 'comment)))))
 137
 138
 139 (defun buffer-syntactic-context-depth (&optional buffer)
 140   "Syntactic parenthesis depth at point in BUFFER.
 141 This is an XEmacs compatibility function."
 142   (with-current-buffer (or buffer (current-buffer))
 143     (nth 0 (syntax-ppss (point)))))
 144
 145
 146 ;; Extents
 147 (defun make-extent (beg end &optional buffer)
 148   (make-overlay beg end buffer))
 149
 150 (defun extent-properties (extent) (overlay-properties extent))
 151 (unless (fboundp 'extent-property) (defalias 'extent-property 'overlay-get))
 152
 153 (defun extent-at (pos &optional object property before)
 154   (with-current-buffer (or object (current-buffer))
 155     (let ((overlays (overlays-at pos)))
 156       (when property
 157         (let (filtered)
 158           (while overlays
 159             (if (overlay-get (car overlays) property)
 160                 (setq filtered (cons (car overlays) filtered)))
 161             (setq overlays (cdr overlays)))
 162           (setq overlays filtered)))
 163       (setq overlays
 164             (sort overlays
 165                   (function (lambda (o1 o2)
 166                               (let ((p1 (or (overlay-get o1 'priority) 0))
 167                                     (p2 (or (overlay-get o2 'priority) 0)))
 168                                 (or (> p1 p2)
 169                                     (and (= p1 p2)
 170                                          (> (overlay-start o1) (overlay-start o2)))))))))
 171       (if before
 172           (nth 1 (memq before overlays))
 173         (car overlays)))))
 174
 175 (defun set-extent-property (extent prop value)
 176   ;; Make sure that separate adjacent extents
 177   ;; with the same mouse-face value
 178   ;; do not run together as one extent.
 179   (and (eq prop 'mouse-face)
 180        (symbolp value)
 181        (setq value (list value)))
 182   (if (eq prop 'duplicable)
 183       (cond ((and value (not (overlay-get extent prop)))
 184              ;; If becoming duplicable, copy all overlayprops to text props.
 185              (add-text-properties (overlay-start extent)
 186                                   (overlay-end extent)
 187                                   (overlay-properties extent)
 188                                   (overlay-buffer extent)))
 189             ;; If becoming no longer duplicable, remove these text props.
 190             ((and (not value) (overlay-get extent prop))
 191              (remove-text-properties (overlay-start extent)
 192                                      (overlay-end extent)
 193                                      (overlay-properties extent)
 194                                      (overlay-buffer extent))))
 195     ;; If extent is already duplicable, put this property
 196     ;; on the text as well as on the overlay.
 197     (if (overlay-get extent 'duplicable)
 198         (put-text-property  (overlay-start extent)
 199                             (overlay-end extent)
 200                             prop value (overlay-buffer extent))))
 201   (overlay-put extent prop value))
 202
 203 (defun set-extent-face (extent face)
 204   (set-extent-property extent 'face face))
 205
 206 (defun set-extent-end-glyph (extent glyph)
 207   (set-extent-property extent 'after-string glyph))
 208
 209 (defun delete-extent (extent)
 210   (set-extent-property extent 'duplicable nil)
 211   (delete-overlay extent))
 212 \f
 213 ;; Support the Lucid names with `screen' instead of `frame'.
 214
 215 (defalias 'current-screen-configuration 'current-frame-configuration)
 216 (defalias 'delete-screen 'delete-frame)
 217 (defalias 'find-file-new-screen 'find-file-other-frame)
 218 (defalias 'find-file-read-only-new-screen 'find-file-read-only-other-frame)
 219 (defalias 'find-tag-new-screen 'find-tag-other-frame)
 220 ;;(defalias 'focus-screen 'focus-frame)
 221 (defalias 'iconify-screen 'iconify-frame)
 222 (defalias 'mail-new-screen 'mail-other-frame)
 223 (defalias 'make-screen-invisible 'make-frame-invisible)
 224 (defalias 'make-screen-visible 'make-frame-visible)
 225 ;; (defalias 'minibuffer-screen-list 'minibuffer-frame-list)
 226 (defalias 'modify-screen-parameters 'modify-frame-parameters)
 227 (defalias 'next-screen 'next-frame)
 228 ;; (defalias 'next-multiscreen-window 'next-multiframe-window)
 229 ;; (defalias 'previous-multiscreen-window 'previous-multiframe-window)
 230 ;; (defalias 'redirect-screen-focus 'redirect-frame-focus)
 231 (defalias 'redraw-screen 'redraw-frame)
 232 ;; (defalias 'screen-char-height 'frame-char-height)
 233 ;; (defalias 'screen-char-width 'frame-char-width)
 234 ;; (defalias 'screen-configuration-to-register 'frame-configuration-to-register)
 235 ;; (defalias 'screen-focus 'frame-focus)
 236 (defalias 'screen-list 'frame-list)
 237 ;; (defalias 'screen-live-p 'frame-live-p)
 238 (defalias 'screen-parameters 'frame-parameters)
 239 (defalias 'screen-pixel-height 'frame-pixel-height)
 240 (defalias 'screen-pixel-width 'frame-pixel-width)
 241 (defalias 'screen-root-window 'frame-root-window)
 242 (defalias 'screen-selected-window 'frame-selected-window)
 243 (defalias 'lower-screen 'lower-frame)
 244 (defalias 'raise-screen 'raise-frame)
 245 (defalias 'screen-visible-p 'frame-visible-p)
 246 (defalias 'screenp 'framep)
 247 (defalias 'select-screen 'select-frame)
 248 (defalias 'selected-screen 'selected-frame)
 249 ;; (defalias 'set-screen-configuration 'set-frame-configuration)
 250 ;; (defalias 'set-screen-height 'set-frame-height)
 251 (defalias 'set-screen-position 'set-frame-position)
 252 (defalias 'set-screen-size 'set-frame-size)
 253 ;; (defalias 'set-screen-width 'set-frame-width)
 254 (defalias 'switch-to-buffer-new-screen 'switch-to-buffer-other-frame)
 255 ;; (defalias 'unfocus-screen 'unfocus-frame)
 256 (defalias 'visible-screen-list 'visible-frame-list)
 257 (defalias 'window-screen 'window-frame)
 258 (defalias 'x-create-screen 'x-create-frame)
 259 (defalias 'x-new-screen 'make-frame)
 260
 261 (provide 'lucid)
 262
 263 ;;; lucid.el ends here