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 copy-tree (tree)
  25   (if (consp tree)
  26       (cons (copy-tree (car tree))
  27             (copy-tree (cdr tree)))
  28     (if (vectorp tree)
  29         (let* ((new (copy-sequence tree))
  30                (i (1- (length new))))
  31           (while (>= i 0)
  32             (aset new i (copy-tree (aref new i)))
  33             (setq i (1- i)))
  34           new)
  35       tree)))
  36
  37 (defalias 'current-time-seconds 'current-time)
  38
  39 (defun remprop (symbol prop)
  40   (let ((plist (symbol-plist symbol)))
  41     (while (eq (car plist) prop)
  42       (setplist symbol (setq plist (cdr (cdr plist)))))
  43     (while plist
  44       (if (eq (nth 2 plist) prop)
  45           (setcdr (cdr plist) (nthcdr 4 plist)))
  46       (setq plist (cdr (cdr plist))))))
  47
  48 (defun map-keymap (function keymap &optional sort-first)
  49   "Call FUNCTION for every binding in KEYMAP.
  50 This includes bindings inherited from a parent keymap.
  51 FUNCTION receives two arguments each time it is called:
  52 the character (more generally, the event type) that is bound,
  53 and the binding it has.
  54
  55 Note that passing the event type directly to `define-key' does not work
  56 in Emacs 19.  We do not emulate that particular feature of Lucid Emacs.
  57 If your code does that, modify it to make a vector containing the event
  58 type that you get.  That will work in both versions of Emacs."
  59   (if sort-first
  60       (let (list)
  61         (map-keymap (function (lambda (a b)
  62                                 (setq list (cons (cons a b) list))))
  63                     keymap)
  64         (setq list (sort list
  65                          (function (lambda (a b)
  66                                      (setq a (car a) b (car b))
  67                                      (if (integerp a)
  68                                          (if (integerp b) (< a b)
  69                                            t)
  70                                        (if (integerp b) t
  71                                          (string< a b)))))))
  72         (while list
  73           (funcall function (car (car list)) (cdr (car list)))
  74           (setq list (cdr list))))
  75     (while (consp keymap)
  76       (if (consp (car keymap))
  77           (funcall function (car (car keymap)) (cdr (car keymap)))
  78         (if (vectorp (car keymap))
  79             (let ((i (1- (length (car keymap))))
  80                   (vector (car keymap)))
  81               (while (>= i 0)
  82                 (funcall function i (aref vector i))
  83                 (setq i (1- i))))))
  84       (setq keymap (cdr keymap)))))
  85
  86 (defun read-number (prompt &optional integers-only)
  87   "Read a number from the minibuffer.
  88 Keep reentering the minibuffer until we get suitable input.
  89 If optional argument INTEGERS-ONLY is non-nil, insist on an integer."
  90   (interactive)
  91   (let (success
  92         (number nil)
  93         (predicate (if integers-only 'integerp 'numberp)))
  94     (while (not success)
  95       (let ((input-string (read-string prompt)))
  96         (condition-case ()
  97             (setq number (read input-string))
  98           (error))
  99         (if (funcall predicate number)
 100             (setq success t)
 101           (let ((cursor-in-echo-area t))
 102             (message "Please type %s"
 103                      (if integers-only "an integer" "a number"))
 104             (sit-for 1)))))
 105     number))
 106
 107 (defun real-path-name (name &optional default)
 108   (file-truename (expand-file-name name default)))
 109
 110 ;; It's not clear what to return if the mouse is not in FRAME.
 111 (defun read-mouse-position (frame)
 112   (let ((pos (mouse-position)))
 113     (if (eq (car pos) frame)
 114         (cdr pos))))
 115
 116 (defun switch-to-other-buffer (arg)
 117   "Switch to the previous buffer.
 118 With a numeric arg N, switch to the Nth most recent buffer.
 119 With an arg of 0, buries the current buffer at the
 120 bottom of the buffer stack."
 121   (interactive "p")
 122   (if (eq arg 0)
 123       (bury-buffer (current-buffer)))
 124   (switch-to-buffer
 125    (if (<= arg 1) (other-buffer (current-buffer))
 126      (nth arg
 127           (apply 'nconc
 128                  (mapcar
 129                   (lambda (buf)
 130                     (if (= ?\  (string-to-char (buffer-name buf)))
 131                         nil
 132                       (list buf)))
 133                   (buffer-list)))))))
 134
 135 (defalias 'find-face 'internal-find-face)
 136 (defalias 'get-face 'internal-get-face)
 137 (defalias 'try-face-font 'internal-try-face-font)
 138
 139 (defalias 'exec-to-string 'shell-command-to-string)
 140 \f
 141 (defun make-extent (beg end &optional buffer)
 142   (make-overlay beg end buffer))
 143
 144 (defun extent-properties (extent)
 145   (overlay-properties extent))
 146
 147 (defun extent-at (pos &optional object property before)
 148   (with-current-buffer (or object (current-buffer))
 149     (let ((overlays (overlays-at pos)))
 150       (when property
 151         (let (filtered)
 152           (while overlays
 153             (if (overlay-get (car overlays) property)
 154                 (setq filtered (cons (car overlays) filtered)))
 155             (setq overlays (cdr overlays)))
 156           (setq overlays filtered)))
 157       (setq overlays
 158             (sort overlays
 159                   (function (lambda (o1 o2)
 160                               (let ((p1 (or (overlay-get o1 'priority) 0))
 161                                     (p2 (or (overlay-get o2 'priority) 0)))
 162                                 (or (> p1 p2)
 163                                     (and (= p1 p2)
 164                                          (> (overlay-start o1) (overlay-start o2)))))))))
 165       (if before
 166           (nth 1 (memq before overlays))
 167         (car overlays)))))
 168
 169 (defun set-extent-property (extent prop value)
 170   ;; Make sure that separate adjacent extents
 171   ;; with the same mouse-face value
 172   ;; do not run together as one extent.
 173   (and (eq prop 'mouse-face)
 174        (symbolp value)
 175        (setq value (list value)))
 176   (if (eq prop 'duplicable)
 177       (cond ((and value (not (overlay-get extent prop)))
 178              ;; If becoming duplicable, copy all overlayprops to text props.
 179              (add-text-properties (overlay-start extent)
 180                                   (overlay-end extent)
 181                                   (overlay-properties extent)
 182                                   (overlay-buffer extent)))
 183             ;; If becoming no longer duplicable, remove these text props.
 184             ((and (not value) (overlay-get extent prop))
 185              (remove-text-properties (overlay-start extent)
 186                                      (overlay-end extent)
 187                                      (overlay-properties extent)
 188                                      (overlay-buffer extent))))
 189     ;; If extent is already duplicable, put this property
 190     ;; on the text as well as on the overlay.
 191     (if (overlay-get extent 'duplicable)
 192         (put-text-property  (overlay-start extent)
 193                             (overlay-end extent)
 194                             prop value (overlay-buffer extent))))
 195   (overlay-put extent prop value))
 196
 197 (defun set-extent-face (extent face)
 198   (set-extent-property extent 'face face))
 199
 200 (defun delete-extent (extent)
 201   (set-extent-property extent 'duplicable nil)
 202   (delete-overlay extent))
 203 \f
 204 ;; Support the Lucid names with `screen' instead of `frame'.
 205
 206 (defalias 'current-screen-configuration 'current-frame-configuration)
 207 (defalias 'delete-screen 'delete-frame)
 208 (defalias 'find-file-new-screen 'find-file-other-frame)
 209 (defalias 'find-file-read-only-new-screen 'find-file-read-only-other-frame)
 210 (defalias 'find-tag-new-screen 'find-tag-other-frame)
 211 ;;(defalias 'focus-screen 'focus-frame)
 212 (defalias 'iconify-screen 'iconify-frame)
 213 (defalias 'mail-new-screen 'mail-other-frame)
 214 (defalias 'make-screen-invisible 'make-frame-invisible)
 215 (defalias 'make-screen-visible 'make-frame-visible)
 216 ;; (defalias 'minibuffer-screen-list 'minibuffer-frame-list)
 217 (defalias 'modify-screen-parameters 'modify-frame-parameters)
 218 (defalias 'next-screen 'next-frame)
 219 ;; (defalias 'next-multiscreen-window 'next-multiframe-window)
 220 ;; (defalias 'previous-multiscreen-window 'previous-multiframe-window)
 221 ;; (defalias 'redirect-screen-focus 'redirect-frame-focus)
 222 (defalias 'redraw-screen 'redraw-frame)
 223 ;; (defalias 'screen-char-height 'frame-char-height)
 224 ;; (defalias 'screen-char-width 'frame-char-width)
 225 ;; (defalias 'screen-configuration-to-register 'frame-configuration-to-register)
 226 ;; (defalias 'screen-focus 'frame-focus)
 227 (defalias 'screen-list 'frame-list)
 228 ;; (defalias 'screen-live-p 'frame-live-p)
 229 (defalias 'screen-parameters 'frame-parameters)
 230 (defalias 'screen-pixel-height 'frame-pixel-height)
 231 (defalias 'screen-pixel-width 'frame-pixel-width)
 232 (defalias 'screen-root-window 'frame-root-window)
 233 (defalias 'screen-selected-window 'frame-selected-window)
 234 (defalias 'lower-screen 'lower-frame)
 235 (defalias 'raise-screen 'raise-frame)
 236 (defalias 'screen-visible-p 'frame-visible-p)
 237 (defalias 'screenp 'framep)
 238 (defalias 'select-screen 'select-frame)
 239 (defalias 'selected-screen 'selected-frame)
 240 ;; (defalias 'set-screen-configuration 'set-frame-configuration)
 241 ;; (defalias 'set-screen-height 'set-frame-height)
 242 (defalias 'set-screen-position 'set-frame-position)
 243 (defalias 'set-screen-size 'set-frame-size)
 244 ;; (defalias 'set-screen-width 'set-frame-width)
 245 (defalias 'switch-to-buffer-new-screen 'switch-to-buffer-other-frame)
 246 ;; (defalias 'unfocus-screen 'unfocus-frame)
 247 (defalias 'visible-screen-list 'visible-frame-list)
 248 (defalias 'window-screen 'window-frame)
 249 (defalias 'x-create-screen 'x-create-frame)
 250 (defalias 'x-new-screen 'make-frame)
 251
 252 (provide 'lucid)
 253
 254 ;;; end of lucid.el