lisp/emacs-lisp/lucid.el

   1 ;;; lucid.el --- Emulate some Lucid Emacs functions.
   2 ;; Copyright (C) 1993, 1995 Free Software Foundation, Inc.
   3
   4 ;; This file is part of GNU Emacs.
   5
   6 ;; GNU Emacs is free software; you can redistribute it and/or modify
   7 ;; it under the terms of the GNU General Public License as published by
   8 ;; the Free Software Foundation; either version 2, or (at your option)
   9 ;; any later version.
  10
  11 ;; GNU Emacs is distributed in the hope that it will be useful,
  12 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 ;; GNU General Public License for more details.
  15
  16 ;; You should have received a copy of the GNU General Public License
  17 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  18 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20
  21 (defun add-timeout (secs function object &optional resignal)
  22   (run-at-time secs resignal function object))
  23
  24 (defun disable-timeout (timeout)
  25   (cancel-timer timeout))
  26
  27 (defun copy-tree (tree)
  28   (if (consp tree)
  29       (cons (copy-tree (car tree))
  30             (copy-tree (cdr tree)))
  31     (if (vectorp tree)
  32         (let* ((new (copy-sequence tree))
  33                (i (1- (length new))))
  34           (while (>= i 0)
  35             (aset new i (copy-tree (aref new i)))
  36             (setq i (1- i)))
  37           new)
  38       tree)))
  39
  40 (defalias 'current-time-seconds 'current-time)
  41
  42 (defun keymap-parent (keymap)
  43   (let ((tail (cdr keymap)))
  44     (while (and tail (not (eq (car tail) 'keymap)))
  45       (setq tail (cdr tail)))
  46     tail))
  47
  48 (defun set-keymap-parent (keymap new-parent)
  49   (let ((tail keymap))
  50     (while (and tail (cdr tail) (not (eq (car (cdr tail)) 'keymap)))
  51       (setq tail (cdr tail)))
  52     (if tail
  53         (setcdr tail new-parent))))
  54
  55 (defun remprop (symbol prop)
  56   (let ((plist (symbol-plist symbol)))
  57     (while (eq (car plist) prop)
  58       (setplist symbol (setq plist (cdr (cdr plist)))))
  59     (while plist
  60       (if (eq (nth 2 plist) prop)
  61           (setcdr (cdr plist) (nthcdr 4 plist)))
  62       (setq plist (cdr (cdr plist))))))
  63
  64 (defun map-keymap (function keymap &optional sort-first)
  65   "Call FUNCTION for every binding in KEYMAP.
  66 This includes bindings inherited from a parent keymap.
  67 FUNCTION receives two arguments each time it is called:
  68 the character (more generally, the event type) that is bound,
  69 and the binding it has.
  70
  71 Note that passing the event type directly to `define-key' does not work
  72 in Emacs 19.  We do not emulate that particular feature of Lucid Emacs.
  73 If your code does that, modify it to make a vector containing the event
  74 type that you get.  That will work in both versions of Emacs."
  75   (if sort-first
  76       (let (list)
  77         (map-keymap (function (lambda (a b)
  78                                 (setq list (cons (cons a b) list))))
  79                     keymap)
  80         (setq list (sort list
  81                          (function (lambda (a b)
  82                                      (setq a (car a) b (car b))
  83                                      (if (integerp a)
  84                                          (if (integerp b) (< a b)
  85                                            t)
  86                                        (if (integerp b) t
  87                                          (string< a b)))))))
  88         (while list
  89           (funcall function (car (car list)) (cdr (car list)))
  90           (setq list (cdr list))))
  91     (while (consp keymap)
  92       (if (consp (car keymap))
  93           (funcall function (car (car keymap)) (cdr (car keymap)))
  94         (if (vectorp (car keymap))
  95             (let ((i (1- (length (car keymap))))
  96                   (vector (car keymap)))
  97               (while (>= i 0)
  98                 (funcall function i (aref vector i))
  99                 (setq i (1- i))))))
 100       (setq keymap (cdr keymap)))))
 101
 102 (defun read-number (prompt &optional integers-only)
 103   "Read a number from the minibuffer.
 104 Keep reentering the minibuffer until we get suitable input.
 105 If optional argument INTEGERS-ONLY is non-nil, insist on an integer."
 106   (interactive)
 107   (let (success
 108         (number nil)
 109         (predicate (if integers-only 'integerp 'numberp)))
 110     (while (not success)
 111       (let ((input-string (read-string prompt)))
 112         (condition-case ()
 113             (setq number (read input-string))
 114           (error))
 115         (if (funcall predicate number)
 116             (setq success t)
 117           (let ((cursor-in-echo-area t))
 118             (message "Please type %s"
 119                      (if integers-only "an integer" "a number"))
 120             (sit-for 1)))))
 121     number))
 122
 123 (defun real-path-name (name &optional default)
 124   (file-truename (expand-file-name name default)))
 125
 126 ;; It's not clear what to return if the mouse is not in FRAME.
 127 (defun read-mouse-position (frame)
 128   (let ((pos (mouse-position)))
 129     (if (eq (car pos) frame)
 130         (cdr pos))))
 131
 132 (defun switch-to-other-buffer (arg)
 133   "Switch to the previous buffer.
 134 With a numeric arg N, switch to the Nth most recent buffer.
 135 With an arg of 0, buries the current buffer at the
 136 bottom of the buffer stack."
 137   (interactive "p")
 138   (if (eq arg 0)
 139       (bury-buffer (current-buffer)))
 140   (switch-to-buffer
 141    (if (<= arg 1) (other-buffer (current-buffer))
 142      (nth arg
 143           (apply 'nconc
 144                  (mapcar
 145                   (lambda (buf)
 146                     (if (= ?\  (string-to-char (buffer-name buf)))
 147                         nil
 148                       (list buf)))
 149                   (buffer-list)))))))
 150
 151 (defalias 'find-face 'internal-find-face)
 152 (defalias 'get-face 'internal-get-face)
 153 (defalias 'try-face-font 'internal-try-face-font)
 154 \f
 155 (defun make-extent (beg end &optional buffer)
 156   (make-overlay beg end buffer))
 157
 158 (defun set-extent-property (extent prop value)
 159   (if (eq prop 'duplicable)
 160       (cond ((and value (not (overlay-get extent prop)))
 161              ;; If becoming duplicable, copy all overlayprops to text props.
 162              (add-text-properties (overlay-start extent)
 163                                   (overlay-end extent)
 164                                   (overlay-properties extent)
 165                                   (overlay-buffer extent)))
 166             ;; If becoming no longer duplicable, remove these text props.
 167             ((and (not value) (overlay-get extent prop))
 168              (remove-text-properties (overlay-start extent)
 169                                      (overlay-end extent)
 170                                      (overlay-properties extent)
 171                                      (overlay-buffer extent))))
 172     ;; If extent is already duplicable, put this property
 173     ;; on the text as well as on the overlay.
 174     (if (overlay-get extent 'duplicable)
 175         (put-text-property  (overlay-start extent)
 176                             (overlay-end extent)
 177                             prop value (overlay-buffer extent))))
 178   (overlay-put extent prop value))
 179
 180 (defun set-extent-face (extent face)
 181   (set-extent-property extent 'face face))
 182
 183 (defun delete-extent (extent)
 184   (set-extent-property extent 'duplicable nil)
 185   (delete-overlay extent))
 186 \f
 187 ;; Support the Lucid names with `screen' instead of `frame'.
 188
 189 (defalias 'current-screen-configuration 'current-frame-configuration)
 190 (defalias 'delete-screen 'delete-frame)
 191 (defalias 'find-file-new-screen 'find-file-other-frame)
 192 (defalias 'find-file-read-only-new-screen 'find-file-read-only-other-frame)
 193 (defalias 'find-tag-new-screen 'find-tag-other-frame)
 194 ;;(defalias 'focus-screen 'focus-frame)
 195 (defalias 'iconify-screen 'iconify-frame)
 196 (defalias 'mail-new-screen 'mail-other-frame)
 197 (defalias 'make-screen-invisible 'make-frame-invisible)
 198 (defalias 'make-screen-visible 'make-frame-visible)
 199 ;; (defalias 'minibuffer-screen-list 'minibuffer-frame-list)
 200 (defalias 'modify-screen-parameters 'modify-frame-parameters)
 201 (defalias 'next-screen 'next-frame)
 202 ;; (defalias 'next-multiscreen-window 'next-multiframe-window)
 203 ;; (defalias 'previous-multiscreen-window 'previous-multiframe-window)
 204 ;; (defalias 'redirect-screen-focus 'redirect-frame-focus)
 205 (defalias 'redraw-screen 'redraw-frame)
 206 ;; (defalias 'screen-char-height 'frame-char-height)
 207 ;; (defalias 'screen-char-width 'frame-char-width)
 208 ;; (defalias 'screen-configuration-to-register 'frame-configuration-to-register)
 209 ;; (defalias 'screen-focus 'frame-focus)
 210 (defalias 'screen-height 'frame-height)
 211 (defalias 'screen-list 'frame-list)
 212 ;; (defalias 'screen-live-p 'frame-live-p)
 213 (defalias 'screen-parameters 'frame-parameters)
 214 (defalias 'screen-pixel-height 'frame-pixel-height)
 215 (defalias 'screen-pixel-width 'frame-pixel-width)
 216 (defalias 'screen-root-window 'frame-root-window)
 217 (defalias 'screen-selected-window 'frame-selected-window)
 218 (defalias 'lower-screen 'lower-frame)
 219 (defalias 'raise-screen 'raise-frame)
 220 (defalias 'screen-visible-p 'frame-visible-p)
 221 (defalias 'screen-width 'frame-width)
 222 (defalias 'screenp 'framep)
 223 (defalias 'select-screen 'select-frame)
 224 (defalias 'selected-screen 'selected-frame)
 225 ;; (defalias 'set-screen-configuration 'set-frame-configuration)
 226 ;; (defalias 'set-screen-height 'set-frame-height)
 227 (defalias 'set-screen-position 'set-frame-position)
 228 (defalias 'set-screen-size 'set-frame-size)
 229 ;; (defalias 'set-screen-width 'set-frame-width)
 230 (defalias 'switch-to-buffer-new-screen 'switch-to-buffer-other-frame)
 231 ;; (defalias 'unfocus-screen 'unfocus-frame)
 232 (defalias 'visible-screen-list 'visible-frame-list)
 233 (defalias 'window-screen 'window-frame)
 234 (defalias 'x-create-screen 'x-create-frame)
 235 (defalias 'x-new-screen 'make-frame)
 236
 237 (provide 'lucid)
 238
 239 ;;; end of lucid.el