1;;; lucid.el --- emulate some Lucid Emacs functions
2
3;; Copyright (C) 1993, 1995, 2001, 2002, 2003, 2004,
4;;   2005, 2006, 2007 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 2, or (at your option)
14;; 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; see the file COPYING.  If not, write to the
23;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24;; Boston, MA 02110-1301, USA.
25
26;;; Commentary:
27
28;;; Code:
29
30;; XEmacs autoloads CL so we might as well make use of it.
31(require 'cl)
32
33(defalias 'current-time-seconds 'current-time)
34
35(defun read-number (prompt &optional integers-only)
36  "Read a number from the minibuffer.
37Keep reentering the minibuffer until we get suitable input.
38If optional argument INTEGERS-ONLY is non-nil, insist on an integer."
39  (interactive)
40  (let (success
41	(number nil)
42	(predicate (if integers-only 'integerp 'numberp)))
43    (while (not success)
44      (let ((input-string (read-string prompt)))
45	(condition-case ()
46	    (setq number (read input-string))
47	  (error))
48	(if (funcall predicate number)
49	    (setq success t)
50	  (let ((cursor-in-echo-area t))
51	    (message "Please type %s"
52		     (if integers-only "an integer" "a number"))
53	    (sit-for 1)))))
54    number))
55
56(defun real-path-name (name &optional default)
57  (file-truename (expand-file-name name default)))
58
59;; It's not clear what to return if the mouse is not in FRAME.
60(defun read-mouse-position (frame)
61  (let ((pos (mouse-position)))
62    (if (eq (car pos) frame)
63	(cdr pos))))
64
65(defun switch-to-other-buffer (arg)
66  "Switch to the previous buffer.
67With a numeric arg N, switch to the Nth most recent buffer.
68With an arg of 0, buries the current buffer at the
69bottom of the buffer stack."
70  (interactive "p")
71  (if (eq arg 0)
72      (bury-buffer (current-buffer)))
73  (switch-to-buffer
74   (if (<= arg 1) (other-buffer (current-buffer))
75     (nth arg
76	  (apply 'nconc
77		 (mapcar
78		  (lambda (buf)
79		    (if (= ?\  (string-to-char (buffer-name buf)))
80			nil
81		      (list buf)))
82		  (buffer-list)))))))
83
84(defun device-class (&optional device)
85  "Return the class (color behavior) of DEVICE.
86This will be one of 'color, 'grayscale, or 'mono.
87This function exists for compatibility with XEmacs."
88  (cond
89   ((display-color-p device) 'color)
90   ((display-grayscale-p device) 'grayscale)
91   (t 'mono)))
92
93(defalias 'find-face 'internal-find-face)
94(defalias 'get-face 'internal-get-face)
95(defalias 'try-face-font 'internal-try-face-font)
96
97(defalias 'exec-to-string 'shell-command-to-string)
98
99
100;; Buffer context
101
102(defun buffer-syntactic-context (&optional buffer)
103  "Syntactic context at point in BUFFER.
104Either of `string', `comment' or nil.
105This is an XEmacs compatibility function."
106  (with-current-buffer (or buffer (current-buffer))
107    (let ((state (syntax-ppss (point))))
108      (cond
109       ((nth 3 state) 'string)
110       ((nth 4 state) 'comment)))))
111
112
113(defun buffer-syntactic-context-depth (&optional buffer)
114  "Syntactic parenthesis depth at point in BUFFER.
115This is an XEmacs compatibility function."
116  (with-current-buffer (or buffer (current-buffer))
117    (nth 0 (syntax-ppss (point)))))
118
119
120;; Extents
121(defun make-extent (beg end &optional buffer)
122  (make-overlay beg end buffer))
123
124(defun extent-properties (extent) (overlay-properties extent))
125(unless (fboundp 'extent-property) (defalias 'extent-property 'overlay-get))
126
127(defun extent-at (pos &optional object property before)
128  (with-current-buffer (or object (current-buffer))
129    (let ((overlays (overlays-at pos)))
130      (when property
131	(let (filtered)
132	  (while overlays
133	    (if (overlay-get (car overlays) property)
134		(setq filtered (cons (car overlays) filtered)))
135	    (setq overlays (cdr overlays)))
136	  (setq overlays filtered)))
137      (setq overlays
138	    (sort overlays
139		  (function (lambda (o1 o2)
140			      (let ((p1 (or (overlay-get o1 'priority) 0))
141				    (p2 (or (overlay-get o2 'priority) 0)))
142				(or (> p1 p2)
143				    (and (= p1 p2)
144					 (> (overlay-start o1) (overlay-start o2)))))))))
145      (if before
146	  (nth 1 (memq before overlays))
147	(car overlays)))))
148
149(defun set-extent-property (extent prop value)
150  ;; Make sure that separate adjacent extents
151  ;; with the same mouse-face value
152  ;; do not run together as one extent.
153  (and (eq prop 'mouse-face)
154       (symbolp value)
155       (setq value (list value)))
156  (if (eq prop 'duplicable)
157      (cond ((and value (not (overlay-get extent prop)))
158	     ;; If becoming duplicable, copy all overlayprops to text props.
159	     (add-text-properties (overlay-start extent)
160				  (overlay-end extent)
161				  (overlay-properties extent)
162				  (overlay-buffer extent)))
163	    ;; If becoming no longer duplicable, remove these text props.
164	    ((and (not value) (overlay-get extent prop))
165	     (remove-text-properties (overlay-start extent)
166				     (overlay-end extent)
167				     (overlay-properties extent)
168				     (overlay-buffer extent))))
169    ;; If extent is already duplicable, put this property
170    ;; on the text as well as on the overlay.
171    (if (overlay-get extent 'duplicable)
172	(put-text-property  (overlay-start extent)
173			    (overlay-end extent)
174			    prop value (overlay-buffer extent))))
175  (overlay-put extent prop value))
176
177(defun set-extent-face (extent face)
178  (set-extent-property extent 'face face))
179
180(defun set-extent-end-glyph (extent glyph)
181  (set-extent-property extent 'after-string glyph))
182
183(defun delete-extent (extent)
184  (set-extent-property extent 'duplicable nil)
185  (delete-overlay extent))
186
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-list 'frame-list)
211;; (defalias 'screen-live-p 'frame-live-p)
212(defalias 'screen-parameters 'frame-parameters)
213(defalias 'screen-pixel-height 'frame-pixel-height)
214(defalias 'screen-pixel-width 'frame-pixel-width)
215(defalias 'screen-root-window 'frame-root-window)
216(defalias 'screen-selected-window 'frame-selected-window)
217(defalias 'lower-screen 'lower-frame)
218(defalias 'raise-screen 'raise-frame)
219(defalias 'screen-visible-p 'frame-visible-p)
220(defalias 'screenp 'framep)
221(defalias 'select-screen 'select-frame)
222(defalias 'selected-screen 'selected-frame)
223;; (defalias 'set-screen-configuration 'set-frame-configuration)
224;; (defalias 'set-screen-height 'set-frame-height)
225(defalias 'set-screen-position 'set-frame-position)
226(defalias 'set-screen-size 'set-frame-size)
227;; (defalias 'set-screen-width 'set-frame-width)
228(defalias 'switch-to-buffer-new-screen 'switch-to-buffer-other-frame)
229;; (defalias 'unfocus-screen 'unfocus-frame)
230(defalias 'visible-screen-list 'visible-frame-list)
231(defalias 'window-screen 'window-frame)
232(defalias 'x-create-screen 'x-create-frame)
233(defalias 'x-new-screen 'make-frame)
234
235(provide 'lucid)
236
237;;; arch-tag: 80f9ab46-0b36-4151-86ed-3edb6d449c9e
238;;; lucid.el ends here
239