lisp/emacs-lisp/lucid.el

   1 ;;; lucid.el --- emulate some Lucid Emacs functions
   2
   3 ;; Copyright (C) 1993, 1995, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   5
   6 ;; Maintainer: FSF
   7 ;; Keywords: emulations
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;;; Code:
  27
  28 ;; XEmacs autoloads CL so we might as well make use of it.
  29 (require 'cl)
  30
  31 (defalias 'current-time-seconds 'current-time)
  32
  33 (defun read-number (prompt &optional integers-only)
  34   "Read a number from the minibuffer.
  35 Keep reentering the minibuffer until we get suitable input.
  36 If optional argument INTEGERS-ONLY is non-nil, insist on an integer."
  37   (interactive)
  38   (let (success
  39         (number nil)
  40         (predicate (if integers-only 'integerp 'numberp)))
  41     (while (not success)
  42       (let ((input-string (read-string prompt)))
  43         (condition-case ()
  44             (setq number (read input-string))
  45           (error))
  46         (if (funcall predicate number)
  47             (setq success t)
  48           (let ((cursor-in-echo-area t))
  49             (message "Please type %s"
  50                      (if integers-only "an integer" "a number"))
  51             (sit-for 1)))))
  52     number))
  53
  54 (defun real-path-name (name &optional default)
  55   (file-truename (expand-file-name name default)))
  56
  57 ;; It's not clear what to return if the mouse is not in FRAME.
  58 (defun read-mouse-position (frame)
  59   (let ((pos (mouse-position)))
  60     (if (eq (car pos) frame)
  61         (cdr pos))))
  62
  63 (defun switch-to-other-buffer (arg)
  64   "Switch to the previous buffer.
  65 With a numeric arg N, switch to the Nth most recent buffer.
  66 With an arg of 0, buries the current buffer at the
  67 bottom of the buffer stack."
  68   (interactive "p")
  69   (if (eq arg 0)
  70       (bury-buffer (current-buffer)))
  71   (switch-to-buffer
  72    (if (<= arg 1) (other-buffer (current-buffer))
  73      (nth arg
  74           (apply 'nconc
  75                  (mapcar
  76                   (lambda (buf)
  77                     (if (= ?\  (string-to-char (buffer-name buf)))
  78                         nil
  79                       (list buf)))
  80                   (buffer-list)))))))
  81
  82 (defun device-class (&optional device)
  83   "Return the class (color behavior) of DEVICE.
  84 This will be one of 'color, 'grayscale, or 'mono.
  85 This function exists for compatibility with XEmacs."
  86   (cond
  87    ((display-color-p device) 'color)
  88    ((display-grayscale-p device) 'grayscale)
  89    (t 'mono)))
  90
  91 (defalias 'find-face 'internal-find-face)
  92 (defalias 'get-face 'internal-get-face)
  93 (defalias 'try-face-font 'internal-try-face-font)
  94
  95 (defalias 'exec-to-string 'shell-command-to-string)
  96 \f
  97
  98 ;; Buffer context
  99
 100 (defun buffer-syntactic-context (&optional buffer)
 101   "Syntactic context at point in BUFFER.
 102 Either of `string', `comment' or nil.
 103 This is an XEmacs compatibility function."
 104   (with-current-buffer (or buffer (current-buffer))
 105     (let ((state (syntax-ppss (point))))
 106       (cond
 107        ((nth 3 state) 'string)
 108        ((nth 4 state) 'comment)))))
 109
 110
 111 (defun buffer-syntactic-context-depth (&optional buffer)
 112   "Syntactic parenthesis depth at point in BUFFER.
 113 This is an XEmacs compatibility function."
 114   (with-current-buffer (or buffer (current-buffer))
 115     (nth 0 (syntax-ppss (point)))))
 116
 117
 118 ;; Extents
 119 (defun make-extent (beg end &optional buffer)
 120   (make-overlay beg end buffer))
 121
 122 (defun extent-properties (extent) (overlay-properties extent))
 123 (unless (fboundp 'extent-property) (defalias 'extent-property 'overlay-get))
 124
 125 (defun extent-at (pos &optional object property before)
 126   (with-current-buffer (or object (current-buffer))
 127     (let ((overlays (overlays-at pos)))
 128       (when property
 129         (let (filtered)
 130           (while overlays
 131             (if (overlay-get (car overlays) property)
 132                 (setq filtered (cons (car overlays) filtered)))
 133             (setq overlays (cdr overlays)))
 134           (setq overlays filtered)))
 135       (setq overlays
 136             (sort overlays
 137                   (function (lambda (o1 o2)
 138                               (let ((p1 (or (overlay-get o1 'priority) 0))
 139                                     (p2 (or (overlay-get o2 'priority) 0)))
 140                                 (or (> p1 p2)
 141                                     (and (= p1 p2)
 142                                          (> (overlay-start o1) (overlay-start o2)))))))))
 143       (if before
 144           (nth 1 (memq before overlays))
 145         (car overlays)))))
 146
 147 (defun set-extent-property (extent prop value)
 148   ;; Make sure that separate adjacent extents
 149   ;; with the same mouse-face value
 150   ;; do not run together as one extent.
 151   (and (eq prop 'mouse-face)
 152        (symbolp value)
 153        (setq value (list value)))
 154   (if (eq prop 'duplicable)
 155       (cond ((and value (not (overlay-get extent prop)))
 156              ;; If becoming duplicable, copy all overlayprops to text props.
 157              (add-text-properties (overlay-start extent)
 158                                   (overlay-end extent)
 159                                   (overlay-properties extent)
 160                                   (overlay-buffer extent)))
 161             ;; If becoming no longer duplicable, remove these text props.
 162             ((and (not value) (overlay-get extent prop))
 163              (remove-text-properties (overlay-start extent)
 164                                      (overlay-end extent)
 165                                      (overlay-properties extent)
 166                                      (overlay-buffer extent))))
 167     ;; If extent is already duplicable, put this property
 168     ;; on the text as well as on the overlay.
 169     (if (overlay-get extent 'duplicable)
 170         (put-text-property  (overlay-start extent)
 171                             (overlay-end extent)
 172                             prop value (overlay-buffer extent))))
 173   (overlay-put extent prop value))
 174
 175 (defun set-extent-face (extent face)
 176   (set-extent-property extent 'face face))
 177
 178 (defun set-extent-end-glyph (extent glyph)
 179   (set-extent-property extent 'after-string glyph))
 180
 181 (defun delete-extent (extent)
 182   (set-extent-property extent 'duplicable nil)
 183   (delete-overlay extent))
 184 \f
 185 ;; Support the Lucid names with `screen' instead of `frame'.
 186
 187 (defalias 'current-screen-configuration 'current-frame-configuration)
 188 (defalias 'delete-screen 'delete-frame)
 189 (defalias 'find-file-new-screen 'find-file-other-frame)
 190 (defalias 'find-file-read-only-new-screen 'find-file-read-only-other-frame)
 191 (defalias 'find-tag-new-screen 'find-tag-other-frame)
 192 ;;(defalias 'focus-screen 'focus-frame)
 193 (defalias 'iconify-screen 'iconify-frame)
 194 (defalias 'mail-new-screen 'mail-other-frame)
 195 (defalias 'make-screen-invisible 'make-frame-invisible)
 196 (defalias 'make-screen-visible 'make-frame-visible)
 197 ;; (defalias 'minibuffer-screen-list 'minibuffer-frame-list)
 198 (defalias 'modify-screen-parameters 'modify-frame-parameters)
 199 (defalias 'next-screen 'next-frame)
 200 ;; (defalias 'next-multiscreen-window 'next-multiframe-window)
 201 ;; (defalias 'previous-multiscreen-window 'previous-multiframe-window)
 202 ;; (defalias 'redirect-screen-focus 'redirect-frame-focus)
 203 (defalias 'redraw-screen 'redraw-frame)
 204 ;; (defalias 'screen-char-height 'frame-char-height)
 205 ;; (defalias 'screen-char-width 'frame-char-width)
 206 ;; (defalias 'screen-configuration-to-register 'frame-configuration-to-register)
 207 ;; (defalias 'screen-focus 'frame-focus)
 208 (defalias 'screen-list 'frame-list)
 209 ;; (defalias 'screen-live-p 'frame-live-p)
 210 (defalias 'screen-parameters 'frame-parameters)
 211 (defalias 'screen-pixel-height 'frame-pixel-height)
 212 (defalias 'screen-pixel-width 'frame-pixel-width)
 213 (defalias 'screen-root-window 'frame-root-window)
 214 (defalias 'screen-selected-window 'frame-selected-window)
 215 (defalias 'lower-screen 'lower-frame)
 216 (defalias 'raise-screen 'raise-frame)
 217 (defalias 'screen-visible-p 'frame-visible-p)
 218 (defalias 'screenp 'framep)
 219 (defalias 'select-screen 'select-frame)
 220 (defalias 'selected-screen 'selected-frame)
 221 ;; (defalias 'set-screen-configuration 'set-frame-configuration)
 222 ;; (defalias 'set-screen-height 'set-frame-height)
 223 (defalias 'set-screen-position 'set-frame-position)
 224 (defalias 'set-screen-size 'set-frame-size)
 225 ;; (defalias 'set-screen-width 'set-frame-width)
 226 (defalias 'switch-to-buffer-new-screen 'switch-to-buffer-other-frame)
 227 ;; (defalias 'unfocus-screen 'unfocus-frame)
 228 (defalias 'visible-screen-list 'visible-frame-list)
 229 (defalias 'window-screen 'window-frame)
 230 (defalias 'x-create-screen 'x-create-frame)
 231 (defalias 'x-new-screen 'make-frame)
 232
 233 (provide 'lucid)
 234
 235 ;; arch-tag: 80f9ab46-0b36-4151-86ed-3edb6d449c9e
 236 ;;; lucid.el ends here