lisp/emacs-lisp/lucid.el

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