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1.1 root 1: ;; Basic lisp subroutines for Emacs
2: ;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.
3:
4: ;; This file is part of GNU Emacs.
5:
6: ;; GNU Emacs is distributed in the hope that it will be useful,
7: ;; but WITHOUT ANY WARRANTY. No author or distributor
8: ;; accepts responsibility to anyone for the consequences of using it
9: ;; or for whether it serves any particular purpose or works at all,
10: ;; unless he says so in writing. Refer to the GNU Emacs General Public
11: ;; License for full details.
12:
13: ;; Everyone is granted permission to copy, modify and redistribute
14: ;; GNU Emacs, but only under the conditions described in the
15: ;; GNU Emacs General Public License. A copy of this license is
16: ;; supposed to have been given to you along with GNU Emacs so you
17: ;; can know your rights and responsibilities. It should be in a
18: ;; file named COPYING. Among other things, the copyright notice
19: ;; and this notice must be preserved on all copies.
20:
21:
22: (defun one-window-p (&optional arg)
23: "Returns non-nil if there is only one window.
24: Optional arg NOMINI non-nil means don't count the minibuffer
25: even if it is active."
26: (eq (selected-window)
27: (next-window (selected-window) (if arg 'arg))))
28:
29: (defun read-quoted-char (&optional prompt)
30: "Like `read-char', except that if the first character read is an octal
31: digit, we read up to two more octal digits and return the character
32: represented by the octal number consisting of those digits.
33: Optional argument PROMPT specifies a string to use to prompt the user."
34: (let ((count 0) (code 0) char)
35: (while (< count 3)
36: (let ((inhibit-quit (zerop count))
37: (help-form nil))
38: (and prompt (message "%s-" prompt))
39: (setq char (read-char))
40: (if inhibit-quit (setq quit-flag nil)))
41: (cond ((null char))
42: ((and (<= ?0 char) (<= char ?7))
43: (setq code (+ (* code 8) (- char ?0))
44: count (1+ count))
45: (and prompt (message (setq prompt
46: (format "%s %c" prompt char)))))
47: ((> count 0)
48: (setq unread-command-char char count 259))
49: (t (setq code char count 259))))
50: (logand 255 code)))
51:
52: (defun error (&rest args)
53: "Signal an error, making error message by passing all args to `format'."
54: (while t
55: (signal 'error (list (apply 'format args)))))
56:
57: (defun undefined ()
58: (interactive)
59: (ding))
60:
61: ;Prevent the \{...} documentation construct
62: ;from mentioning keys that run this command.
63: (put 'undefined 'suppress-keymap t)
64:
65: (defun suppress-keymap (map &optional arg)
66: "Make MAP override all buffer-modifying commands to be undefined.
67: Works by knowing which commands are normally buffer-modifying.
68: Normally also makes digits set numeric arg,
69: but optional second arg NODIGITS non-nil prevents this."
70: (let ((i ? ))
71: (while (< i 127)
72: (aset map i 'undefined)
73: (setq i (1+ i))))
74: (or arg
75: (let (loop)
76: (aset map ?- 'negative-argument)
77: ;; Make plain numbers do numeric args.
78: (setq loop ?0)
79: (while (<= loop ?9)
80: (aset map loop 'digit-argument)
81: (setq loop (1+ loop))))))
82:
83: ;; now in fns.c
84: ;(defun nth (n list)
85: ; "Returns the Nth element of LIST.
86: ;N counts from zero. If LIST is not that long, nil is returned."
87: ; (car (nthcdr n list)))
88: ;
89: ;(defun copy-alist (alist)
90: ; "Return a copy of ALIST.
91: ;This is a new alist which represents the same mapping
92: ;from objects to objects, but does not share the alist structure with ALIST.
93: ;The objects mapped (cars and cdrs of elements of the alist)
94: ;are shared, however."
95: ; (setq alist (copy-sequence alist))
96: ; (let ((tail alist))
97: ; (while tail
98: ; (if (consp (car tail))
99: ; (setcar tail (cons (car (car tail)) (cdr (car tail)))))
100: ; (setq tail (cdr tail))))
101: ; alist)
102:
103: ;Moved to keymap.c
104: ;(defun copy-keymap (keymap)
105: ; "Return a copy of KEYMAP"
106: ; (while (not (keymapp keymap))
107: ; (setq keymap (signal 'wrong-type-argument (list 'keymapp keymap))))
108: ; (if (vectorp keymap)
109: ; (copy-sequence keymap)
110: ; (copy-alist keymap)))
111:
112: (defun substitute-key-definition (olddef newdef keymap)
113: "Replace OLDDEF with NEWDEF for any keys in KEYMAP now defined as OLDDEF.
114: In other words, OLDDEF is replaced with NEWDEF where ever it appears."
115: (if (arrayp keymap)
116: (let ((len (length keymap))
117: (i 0))
118: (while (< i len)
119: (if (eq (aref keymap i) olddef)
120: (aset keymap i newdef))
121: (setq i (1+ i))))
122: (while keymap
123: (if (eq (cdr-safe (car-safe keymap)) olddef)
124: (setcdr (car keymap) newdef))
125: (setq keymap (cdr keymap)))))
126:
127: ;; Avoids useless byte-compilation.
128: ;; In the future, would be better to fix byte compiler
129: ;; not to really compile in cases like this,
130: ;; and use defun here.
131: (fset 'ignore '(lambda (&rest ignore) nil))
132:
133:
134: ; old names
135: (fset 'make-syntax-table 'copy-syntax-table)
136: (fset 'dot 'point)
137: (fset 'dot-marker 'point-marker)
138: (fset 'dot-min 'point-min)
139: (fset 'dot-max 'point-max)
140: (fset 'window-dot 'window-point)
141: (fset 'set-window-dot 'set-window-point)
142: (fset 'read-input 'read-string)
143: (fset 'send-string 'process-send-string)
144: (fset 'send-region 'process-send-region)
145: (fset 'show-buffer 'set-window-buffer)
146:
147: ; alternate names
148: (fset 'string= 'string-equal)
149: (fset 'string< 'string-lessp)
150: (fset 'mod '%)
151: (fset 'move-marker 'set-marker)
152: (fset 'eql 'eq)
153: (fset 'not 'null)
154: (fset 'numberp 'integerp)
155: (fset 'rplaca 'setcar)
156: (fset 'rplacd 'setcdr)
157: (fset 'beep 'ding) ;preserve lingual purtity
158: (fset 'indent-to-column 'indent-to)
159: (fset 'backward-delete-char 'delete-backward-char)
160:
161: (defvar global-map nil
162: "Default global keymap mapping Emacs keyboard input into commands.
163: The value is a keymap which is usually (but not necessarily) Emacs's
164: global map.")
165:
166: (defvar ctl-x-map nil
167: "Default keymap for C-x commands.
168: The normal global definition of the character C-x indirects to this keymap.")
169:
170: (defvar esc-map nil
171: "Default keymap for ESC (meta) commands.
172: The normal global definition of the character ESC indirects to this keymap.")
173:
174: (defvar mouse-map nil
175: "Keymap for mouse commands from the X window system.")
176:
177: (defun run-hooks (&rest hooklist)
178: "Takes hook names and runs each one in turn. Major mode functions use this.
179: Each argument should be a symbol, a hook variable.
180: These symbols are processed in the order specified.
181: If a hook symbol has a non-nil value, that value may be a function
182: or a list of functions to be called to run the hook.
183: If the value is a function, it is called with no arguments.
184: If it is a list, the elements are called, in order, with no arguments."
185: (while hooklist
186: (let ((sym (car hooklist)))
187: (and (boundp sym)
188: (symbol-value sym)
189: (let ((value (symbol-value sym)))
190: (if (and (listp value) (not (eq (car value) 'lambda)))
191: (mapcar 'funcall value)
192: (funcall value)))))
193: (setq hooklist (cdr hooklist))))
194:
195: (defun momentary-string-display (string pos &optional exit-char message)
196: "Momentarily display STRING in the buffer at POS.
197: Display remains until next character is typed.
198: If the char is EXIT-CHAR (optional third arg, default is SPC) it is swallowed;
199: otherwise it is then available as input (as a command if nothing else).
200: Display MESSAGE (optional fourth arg) in the echo area.
201: If MESSAGE is nil, instructions to type EXIT-CHAR are displayed there."
202: (or exit-char (setq exit-char ?\ ))
203: (let ((buffer-read-only nil)
204: (modified (buffer-modified-p))
205: (name buffer-file-name)
206: insert-end)
207: (unwind-protect
208: (progn
209: (save-excursion
210: (goto-char pos)
211: ;; defeat file locking... don't try this at home, kids!
212: (setq buffer-file-name nil)
213: (insert-before-markers string)
214: (setq insert-end (point)))
215: (message (or message "Type %s to continue editing.")
216: (single-key-description exit-char))
217: (let ((char (read-char)))
218: (or (eq char exit-char)
219: (setq unread-command-char char))))
220: (if insert-end
221: (save-excursion
222: (delete-region pos insert-end)))
223: (setq buffer-file-name name)
224: (set-buffer-modified-p modified))))
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