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1 | ;; Basic lisp subroutines for Emacs |
2 | ;; Copyright (C) 1985, 1986, 1990 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 1, 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 one-window-p (&optional arg) | |
22 | "Returns non-nil if there is only one window. | |
23 | Optional arg NOMINI non-nil means don't count the minibuffer | |
24 | even if it is active." | |
25 | (eq (selected-window) | |
26 | (next-window (selected-window) (if arg 'arg)))) | |
27 | ||
28 | (defun read-quoted-char (&optional prompt) | |
29 | "Like `read-char', except that if the first character read is an octal | |
30 | digit, we read up to two more octal digits and return the character | |
31 | represented by the octal number consisting of those digits. | |
32 | Optional argument PROMPT specifies a string to use to prompt the user." | |
33 | (let ((count 0) (code 0) char) | |
34 | (while (< count 3) | |
35 | (let ((inhibit-quit (zerop count)) | |
36 | (help-form nil)) | |
37 | (and prompt (message "%s-" prompt)) | |
38 | (setq char (read-char)) | |
39 | (if inhibit-quit (setq quit-flag nil))) | |
40 | (cond ((null char)) | |
41 | ((and (<= ?0 char) (<= char ?7)) | |
42 | (setq code (+ (* code 8) (- char ?0)) | |
43 | count (1+ count)) | |
44 | (and prompt (message (setq prompt | |
45 | (format "%s %c" prompt char))))) | |
46 | ((> count 0) | |
47 | (setq unread-command-char char count 259)) | |
48 | (t (setq code char count 259)))) | |
49 | (logand 255 code))) | |
50 | ||
51 | (defun error (&rest args) | |
52 | "Signal an error, making error message by passing all args to `format'." | |
53 | (while t | |
54 | (signal 'error (list (apply 'format args))))) | |
55 | ||
56 | (defun undefined () | |
57 | (interactive) | |
58 | (ding)) | |
59 | ||
60 | ;Prevent the \{...} documentation construct | |
61 | ;from mentioning keys that run this command. | |
62 | (put 'undefined 'suppress-keymap t) | |
63 | ||
64 | (defun suppress-keymap (map &optional arg) | |
65 | "Make MAP override all buffer-modifying commands to be undefined. | |
66 | Works by knowing which commands are normally buffer-modifying. | |
67 | Normally also makes digits set numeric arg, | |
68 | but optional second arg NODIGITS non-nil prevents this." | |
69 | (let ((i ? )) | |
70 | (while (< i 127) | |
71 | (aset map i 'undefined) | |
72 | (setq i (1+ i)))) | |
73 | (or arg | |
74 | (let (loop) | |
75 | (aset map ?- 'negative-argument) | |
76 | ;; Make plain numbers do numeric args. | |
77 | (setq loop ?0) | |
78 | (while (<= loop ?9) | |
79 | (aset map loop 'digit-argument) | |
80 | (setq loop (1+ loop)))))) | |
81 | ||
82 | ;; now in fns.c | |
83 | ;(defun nth (n list) | |
84 | ; "Returns the Nth element of LIST. | |
85 | ;N counts from zero. If LIST is not that long, nil is returned." | |
86 | ; (car (nthcdr n list))) | |
87 | ; | |
88 | ;(defun copy-alist (alist) | |
89 | ; "Return a copy of ALIST. | |
90 | ;This is a new alist which represents the same mapping | |
91 | ;from objects to objects, but does not share the alist structure with ALIST. | |
92 | ;The objects mapped (cars and cdrs of elements of the alist) | |
93 | ;are shared, however." | |
94 | ; (setq alist (copy-sequence alist)) | |
95 | ; (let ((tail alist)) | |
96 | ; (while tail | |
97 | ; (if (consp (car tail)) | |
98 | ; (setcar tail (cons (car (car tail)) (cdr (car tail))))) | |
99 | ; (setq tail (cdr tail)))) | |
100 | ; alist) | |
101 | ||
102 | ;Moved to keymap.c | |
103 | ;(defun copy-keymap (keymap) | |
104 | ; "Return a copy of KEYMAP" | |
105 | ; (while (not (keymapp keymap)) | |
106 | ; (setq keymap (signal 'wrong-type-argument (list 'keymapp keymap)))) | |
107 | ; (if (vectorp keymap) | |
108 | ; (copy-sequence keymap) | |
109 | ; (copy-alist keymap))) | |
110 | ||
111 | (defun substitute-key-definition (olddef newdef keymap) | |
112 | "Replace OLDDEF with NEWDEF for any keys in KEYMAP now defined as OLDDEF. | |
113 | In other words, OLDDEF is replaced with NEWDEF where ever it appears." | |
114 | (if (arrayp keymap) | |
115 | (let ((len (length keymap)) | |
116 | (i 0)) | |
117 | (while (< i len) | |
118 | (if (eq (aref keymap i) olddef) | |
119 | (aset keymap i newdef)) | |
120 | (setq i (1+ i)))) | |
121 | (while keymap | |
122 | (if (eq (cdr-safe (car-safe keymap)) olddef) | |
123 | (setcdr (car keymap) newdef)) | |
124 | (setq keymap (cdr keymap))))) | |
125 | ||
126 | ;; Avoids useless byte-compilation. | |
127 | ;; In the future, would be better to fix byte compiler | |
128 | ;; not to really compile in cases like this, | |
129 | ;; and use defun here. | |
130 | (fset 'ignore '(lambda (&rest ignore) nil)) | |
131 | ||
132 | \f | |
133 | ; old names | |
134 | (fset 'make-syntax-table 'copy-syntax-table) | |
135 | (fset 'dot 'point) | |
136 | (fset 'dot-marker 'point-marker) | |
137 | (fset 'dot-min 'point-min) | |
138 | (fset 'dot-max 'point-max) | |
139 | (fset 'window-dot 'window-point) | |
140 | (fset 'set-window-dot 'set-window-point) | |
141 | (fset 'read-input 'read-string) | |
142 | (fset 'send-string 'process-send-string) | |
143 | (fset 'send-region 'process-send-region) | |
144 | (fset 'show-buffer 'set-window-buffer) | |
145 | ||
146 | ; alternate names | |
147 | (fset 'string= 'string-equal) | |
148 | (fset 'string< 'string-lessp) | |
149 | (fset 'mod '%) | |
150 | (fset 'move-marker 'set-marker) | |
151 | (fset 'eql 'eq) | |
152 | (fset 'not 'null) | |
153 | (fset 'numberp 'integerp) | |
154 | (fset 'rplaca 'setcar) | |
155 | (fset 'rplacd 'setcdr) | |
156 | (fset 'beep 'ding) ;preserve lingual purtity | |
157 | (fset 'indent-to-column 'indent-to) | |
158 | (fset 'backward-delete-char 'delete-backward-char) | |
159 | \f | |
160 | (defvar global-map nil | |
161 | "Default global keymap mapping Emacs keyboard input into commands. | |
162 | The value is a keymap which is usually (but not necessarily) Emacs's | |
163 | global map.") | |
164 | ||
165 | (defvar ctl-x-map nil | |
166 | "Default keymap for C-x commands. | |
167 | The normal global definition of the character C-x indirects to this keymap.") | |
168 | ||
169 | (defvar esc-map nil | |
170 | "Default keymap for ESC (meta) commands. | |
171 | The normal global definition of the character ESC indirects to this keymap.") | |
172 | ||
173 | (defvar mouse-map nil | |
174 | "Keymap for mouse commands from the X window system.") | |
175 | \f | |
176 | (defun run-hooks (&rest hooklist) | |
177 | "Takes hook names and runs each one in turn. Major mode functions use this. | |
178 | Each argument should be a symbol, a hook variable. | |
179 | These symbols are processed in the order specified. | |
180 | If a hook symbol has a non-nil value, that value may be a function | |
181 | or a list of functions to be called to run the hook. | |
182 | If the value is a function, it is called with no arguments. | |
183 | If it is a list, the elements are called, in order, with no arguments." | |
184 | (while hooklist | |
185 | (let ((sym (car hooklist))) | |
186 | (and (boundp sym) | |
187 | (symbol-value sym) | |
188 | (let ((value (symbol-value sym))) | |
189 | (if (and (listp value) (not (eq (car value) 'lambda))) | |
190 | (mapcar 'funcall value) | |
191 | (funcall value))))) | |
192 | (setq hooklist (cdr hooklist)))) | |
193 | \f | |
194 | (defun momentary-string-display (string pos &optional exit-char message) | |
195 | "Momentarily display STRING in the buffer at POS. | |
196 | Display remains until next character is typed. | |
197 | If the char is EXIT-CHAR (optional third arg, default is SPC) it is swallowed; | |
198 | otherwise it is then available as input (as a command if nothing else). | |
199 | Display MESSAGE (optional fourth arg) in the echo area. | |
200 | If MESSAGE is nil, instructions to type EXIT-CHAR are displayed there." | |
201 | (or exit-char (setq exit-char ?\ )) | |
202 | (let ((buffer-read-only nil) | |
203 | (modified (buffer-modified-p)) | |
204 | (name buffer-file-name) | |
205 | insert-end) | |
206 | (unwind-protect | |
207 | (progn | |
208 | (save-excursion | |
209 | (goto-char pos) | |
210 | ;; defeat file locking... don't try this at home, kids! | |
211 | (setq buffer-file-name nil) | |
212 | (insert-before-markers string) | |
213 | (setq insert-end (point))) | |
214 | (message (or message "Type %s to continue editing.") | |
215 | (single-key-description exit-char)) | |
216 | (let ((char (read-char))) | |
217 | (or (eq char exit-char) | |
218 | (setq unread-command-char char)))) | |
219 | (if insert-end | |
220 | (save-excursion | |
221 | (delete-region pos insert-end))) | |
222 | (setq buffer-file-name name) | |
223 | (set-buffer-modified-p modified)))) | |
224 | \f | |
225 | (defun undo-start () | |
226 | "Move undo-pointer to front of undo records. | |
227 | The next call to undo-more will undo the most recently made change." | |
228 | (if (eq buffer-undo-list t) | |
229 | (error "No undo information in this buffer")) | |
230 | (setq pending-undo-list buffer-undo-list)) | |
231 | ||
232 | (defun undo-more (count) | |
233 | "Undo back N undo-boundaries beyond what was already undone recently. | |
234 | Call undo-start to get ready to undo recent changes, | |
235 | then call undo-more one or more times to undo them." | |
236 | (or pending-undo-list | |
237 | (error "No further undo information")) | |
238 | (setq pending-undo-list (primitive-undo count pending-undo-list))) |