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., 51 Franklin Street, Fifth Floor,
  23 ;; Boston, MA 02110-1301, 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 read-number (prompt &optional integers-only)
  35   "Read a number from the minibuffer.
  36 Keep reentering the minibuffer until we get suitable input.
  37 If optional argument INTEGERS-ONLY is non-nil, insist on an integer."
  38   (interactive)
  39   (let (success
  40         (number nil)
  41         (predicate (if integers-only 'integerp 'numberp)))
  42     (while (not success)
  43       (let ((input-string (read-string prompt)))
  44         (condition-case ()
  45             (setq number (read input-string))
  46           (error))
  47         (if (funcall predicate number)
  48             (setq success t)
  49           (let ((cursor-in-echo-area t))
  50             (message "Please type %s"
  51                      (if integers-only "an integer" "a number"))
  52             (sit-for 1)))))
  53     number))
  54
  55 (defun real-path-name (name &optional default)
  56   (file-truename (expand-file-name name default)))
  57
  58 ;; It's not clear what to return if the mouse is not in FRAME.
  59 (defun read-mouse-position (frame)
  60   (let ((pos (mouse-position)))
  61     (if (eq (car pos) frame)
  62         (cdr pos))))
  63
  64 (defun switch-to-other-buffer (arg)
  65   "Switch to the previous buffer.
  66 With a numeric arg N, switch to the Nth most recent buffer.
  67 With an arg of 0, buries the current buffer at the
  68 bottom of the buffer stack."
  69   (interactive "p")
  70   (if (eq arg 0)
  71       (bury-buffer (current-buffer)))
  72   (switch-to-buffer
  73    (if (<= arg 1) (other-buffer (current-buffer))
  74      (nth arg
  75           (apply 'nconc
  76                  (mapcar
  77                   (lambda (buf)
  78                     (if (= ?\  (string-to-char (buffer-name buf)))
  79                         nil
  80                       (list buf)))
  81                   (buffer-list)))))))
  82
  83 (defun device-class (&optional device)
  84   "Return the class (color behavior) of DEVICE.
  85 This will be one of 'color, 'grayscale, or 'mono.
  86 This function exists for compatibility with XEmacs."
  87   (cond
  88    ((display-color-p device) 'color)
  89    ((display-grayscale-p device) 'grayscale)
  90    (t 'mono)))
  91
  92 (defalias 'find-face 'internal-find-face)
  93 (defalias 'get-face 'internal-get-face)
  94 (defalias 'try-face-font 'internal-try-face-font)
  95
  96 (defalias 'exec-to-string 'shell-command-to-string)
  97 \f
  98
  99 ;; Buffer context
 100
 101 (defun buffer-syntactic-context (&optional buffer)
 102   "Syntactic context at point in BUFFER.
 103 Either of `string', `comment' or nil.
 104 This is an XEmacs compatibility function."
 105   (with-current-buffer (or buffer (current-buffer))
 106     (let ((state (syntax-ppss (point))))
 107       (cond
 108        ((nth 3 state) 'string)
 109        ((nth 4 state) 'comment)))))
 110
 111
 112 (defun buffer-syntactic-context-depth (&optional buffer)
 113   "Syntactic parenthesis depth at point in BUFFER.
 114 This is an XEmacs compatibility function."
 115   (with-current-buffer (or buffer (current-buffer))
 116     (nth 0 (syntax-ppss (point)))))
 117
 118
 119 ;; Extents
 120 (defun make-extent (beg end &optional buffer)
 121   (make-overlay beg end buffer))
 122
 123 (defun extent-properties (extent) (overlay-properties extent))
 124 (unless (fboundp 'extent-property) (defalias 'extent-property 'overlay-get))
 125
 126 (defun extent-at (pos &optional object property before)
 127   (with-current-buffer (or object (current-buffer))
 128     (let ((overlays (overlays-at pos)))
 129       (when property
 130         (let (filtered)
 131           (while overlays
 132             (if (overlay-get (car overlays) property)
 133                 (setq filtered (cons (car overlays) filtered)))
 134             (setq overlays (cdr overlays)))
 135           (setq overlays filtered)))
 136       (setq overlays
 137             (sort overlays
 138                   (function (lambda (o1 o2)
 139                               (let ((p1 (or (overlay-get o1 'priority) 0))
 140                                     (p2 (or (overlay-get o2 'priority) 0)))
 141                                 (or (> p1 p2)
 142                                     (and (= p1 p2)
 143                                          (> (overlay-start o1) (overlay-start o2)))))))))
 144       (if before
 145           (nth 1 (memq before overlays))
 146         (car overlays)))))
 147
 148 (defun set-extent-property (extent prop value)
 149   ;; Make sure that separate adjacent extents
 150   ;; with the same mouse-face value
 151   ;; do not run together as one extent.
 152   (and (eq prop 'mouse-face)
 153        (symbolp value)
 154        (setq value (list value)))
 155   (if (eq prop 'duplicable)
 156       (cond ((and value (not (overlay-get extent prop)))
 157              ;; If becoming duplicable, copy all overlayprops to text props.
 158              (add-text-properties (overlay-start extent)
 159                                   (overlay-end extent)
 160                                   (overlay-properties extent)
 161                                   (overlay-buffer extent)))
 162             ;; If becoming no longer duplicable, remove these text props.
 163             ((and (not value) (overlay-get extent prop))
 164              (remove-text-properties (overlay-start extent)
 165                                      (overlay-end extent)
 166                                      (overlay-properties extent)
 167                                      (overlay-buffer extent))))
 168     ;; If extent is already duplicable, put this property
 169     ;; on the text as well as on the overlay.
 170     (if (overlay-get extent 'duplicable)
 171         (put-text-property  (overlay-start extent)
 172                             (overlay-end extent)
 173                             prop value (overlay-buffer extent))))
 174   (overlay-put extent prop value))
 175
 176 (defun set-extent-face (extent face)
 177   (set-extent-property extent 'face face))
 178
 179 (defun set-extent-end-glyph (extent glyph)
 180   (set-extent-property extent 'after-string glyph))
 181
 182 (defun delete-extent (extent)
 183   (set-extent-property extent 'duplicable nil)
 184   (delete-overlay extent))
 185 \f
 186 ;; Support the Lucid names with `screen' instead of `frame'.
 187
 188 (defalias 'current-screen-configuration 'current-frame-configuration)
 189 (defalias 'delete-screen 'delete-frame)
 190 (defalias 'find-file-new-screen 'find-file-other-frame)
 191 (defalias 'find-file-read-only-new-screen 'find-file-read-only-other-frame)
 192 (defalias 'find-tag-new-screen 'find-tag-other-frame)
 193 ;;(defalias 'focus-screen 'focus-frame)
 194 (defalias 'iconify-screen 'iconify-frame)
 195 (defalias 'mail-new-screen 'mail-other-frame)
 196 (defalias 'make-screen-invisible 'make-frame-invisible)
 197 (defalias 'make-screen-visible 'make-frame-visible)
 198 ;; (defalias 'minibuffer-screen-list 'minibuffer-frame-list)
 199 (defalias 'modify-screen-parameters 'modify-frame-parameters)
 200 (defalias 'next-screen 'next-frame)
 201 ;; (defalias 'next-multiscreen-window 'next-multiframe-window)
 202 ;; (defalias 'previous-multiscreen-window 'previous-multiframe-window)
 203 ;; (defalias 'redirect-screen-focus 'redirect-frame-focus)
 204 (defalias 'redraw-screen 'redraw-frame)
 205 ;; (defalias 'screen-char-height 'frame-char-height)
 206 ;; (defalias 'screen-char-width 'frame-char-width)
 207 ;; (defalias 'screen-configuration-to-register 'frame-configuration-to-register)
 208 ;; (defalias 'screen-focus 'frame-focus)
 209 (defalias 'screen-list 'frame-list)
 210 ;; (defalias 'screen-live-p 'frame-live-p)
 211 (defalias 'screen-parameters 'frame-parameters)
 212 (defalias 'screen-pixel-height 'frame-pixel-height)
 213 (defalias 'screen-pixel-width 'frame-pixel-width)
 214 (defalias 'screen-root-window 'frame-root-window)
 215 (defalias 'screen-selected-window 'frame-selected-window)
 216 (defalias 'lower-screen 'lower-frame)
 217 (defalias 'raise-screen 'raise-frame)
 218 (defalias 'screen-visible-p 'frame-visible-p)
 219 (defalias 'screenp 'framep)
 220 (defalias 'select-screen 'select-frame)
 221 (defalias 'selected-screen 'selected-frame)
 222 ;; (defalias 'set-screen-configuration 'set-frame-configuration)
 223 ;; (defalias 'set-screen-height 'set-frame-height)
 224 (defalias 'set-screen-position 'set-frame-position)
 225 (defalias 'set-screen-size 'set-frame-size)
 226 ;; (defalias 'set-screen-width 'set-frame-width)
 227 (defalias 'switch-to-buffer-new-screen 'switch-to-buffer-other-frame)
 228 ;; (defalias 'unfocus-screen 'unfocus-frame)
 229 (defalias 'visible-screen-list 'visible-frame-list)
 230 (defalias 'window-screen 'window-frame)
 231 (defalias 'x-create-screen 'x-create-frame)
 232 (defalias 'x-new-screen 'make-frame)
 233
 234 (provide 'lucid)
 235
 236 ;;; arch-tag: 80f9ab46-0b36-4151-86ed-3edb6d449c9e
 237 ;;; lucid.el ends here