simple.el 112 KB
Newer Older
Eric S. Raymond's avatar
Eric S. Raymond committed
1 2
;;; simple.el --- basic editing commands for Emacs

Karl Heuer's avatar
Karl Heuer committed
3
;; Copyright (C) 1985, 86, 87, 93, 94, 95 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
4 5 6 7 8

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
Eric S. Raymond's avatar
Eric S. Raymond committed
9
;; the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
10 11 12 13 14 15 16 17 18 19 20
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

21 22 23 24 25
;;; Commentary:

;; A grab-bag of basic Emacs commands not specifically related to some
;; major mode or to file-handling.

Eric S. Raymond's avatar
Eric S. Raymond committed
26
;;; Code:
Jim Blandy's avatar
Jim Blandy committed
27

28
(defun newline (&optional arg)
29
  "Insert a newline, and move to left margin of the new line if it's blank.
30 31 32 33 34 35 36 37 38 39 40
The newline is marked with the text-property `hard'.
With arg, insert that many newlines.
In Auto Fill mode, if no numeric arg, break the preceding line if it's long."
  (interactive "*P")
  ;; Inserting a newline at the end of a line produces better redisplay in
  ;; try_window_id than inserting at the beginning of a line, and the textual
  ;; result is the same.  So, if we're at beginning of line, pretend to be at
  ;; the end of the previous line.
  (let ((flag (and (not (bobp)) 
		   (bolp)
		   (< (or (previous-property-change (point)) -2) 
41 42 43 44
		      (- (point) 2))))
	(was-page-start (and (bolp)
			     (looking-at page-delimiter)))
	(beforepos (point)))
45 46 47 48 49
    (if flag (backward-char 1))
    ;; Call self-insert so that auto-fill, abbrev expansion etc. happens.
    ;; Set last-command-char to tell self-insert what to insert.
    (let ((last-command-char ?\n)
	  ;; Don't auto-fill if we have a numeric argument.
50 51 52
	  ;; Also not if flag is true (it would fill wrong line);
	  ;; there is no need to since we're at BOL.
	  (auto-fill-function (if (or arg flag) nil auto-fill-function)))
53 54 55 56 57 58 59 60 61 62
      (self-insert-command (prefix-numeric-value arg)))
    ;; Mark the newline(s) `hard'.
    (if use-hard-newlines
	(let* ((from (- (point) (if arg (prefix-numeric-value arg) 1)))
	       (sticky (get-text-property from 'rear-nonsticky)))
	  (put-text-property from (point) 'hard 't)
	  ;; If rear-nonsticky is not "t", add 'hard to rear-nonsticky list
	  (if (and (listp sticky) (not (memq 'hard sticky)))
	      (put-text-property from (point) 'rear-nonsticky
				 (cons 'hard sticky)))))
63 64 65 66 67 68 69 70 71 72 73 74 75 76 77
    ;; If the newline leaves the previous line blank,
    ;; and we have a left margin, delete that from the blank line.
    (or flag
	(save-excursion
	  (goto-char beforepos)
	  (beginning-of-line)
	  (and (looking-at "[ \t]$")
	       (> (current-left-margin) 0)
	       (delete-region (point) (progn (end-of-line) (point))))))
    (if flag (forward-char 1))
    ;; Indent the line after the newline, except in one case:
    ;; when we added the newline at the beginning of a line
    ;; which starts a page.
    (or was-page-start
	(move-to-left-margin nil t)))
78 79
  nil)

Jim Blandy's avatar
Jim Blandy committed
80
(defun open-line (arg)
81
  "Insert a newline and leave point before it.
82
If there is a fill prefix and/or a left-margin, insert them on the new line
83
if the line would have been blank.
84
With arg N, insert N newlines."
Jim Blandy's avatar
Jim Blandy committed
85
  (interactive "*p")
86
  (let* ((do-fill-prefix (and fill-prefix (bolp)))
87
	 (do-left-margin (and (bolp) (> (current-left-margin) 0)))
88
	 (loc (point)))
89 90
    (newline arg)
    (goto-char loc)
91
    (while (> arg 0)
92 93 94 95
      (cond ((bolp)
	     (if do-left-margin (indent-to (current-left-margin)))
	     (if do-fill-prefix (insert-and-inherit fill-prefix))))
      (forward-line 1)
96
      (setq arg (1- arg)))
97 98
    (goto-char loc)
    (end-of-line)))
Jim Blandy's avatar
Jim Blandy committed
99 100 101 102 103 104 105

(defun split-line ()
  "Split current line, moving portion beyond point vertically down."
  (interactive "*")
  (skip-chars-forward " \t")
  (let ((col (current-column))
	(pos (point)))
106
    (newline 1)
Jim Blandy's avatar
Jim Blandy committed
107 108 109 110 111
    (indent-to col 0)
    (goto-char pos)))

(defun quoted-insert (arg)
  "Read next input character and insert it.
112
This is useful for inserting control characters.
Jim Blandy's avatar
Jim Blandy committed
113
You may also type up to 3 octal digits, to insert a character with that code.
114 115 116 117 118 119 120 121 122

In overwrite mode, this function inserts the character anyway, and
does not handle octal digits specially.  This means that if you use
overwrite as your normal editing mode, you can use this function to
insert characters when necessary.

In binary overwrite mode, this function does overwrite, and octal
digits are interpreted as a character code.  This is supposed to make
this function useful in editing binary files."
Jim Blandy's avatar
Jim Blandy committed
123
  (interactive "*p")
124 125 126 127
  (let ((char (if (or (not overwrite-mode)
		      (eq overwrite-mode 'overwrite-mode-binary))
		  (read-quoted-char)
		(read-char))))
128 129 130 131 132 133
    (if (> arg 0)
	(if (eq overwrite-mode 'overwrite-mode-binary)
	    (delete-char arg)))
    (while (> arg 0)
      (insert-and-inherit char)
      (setq arg (1- arg)))))
Jim Blandy's avatar
Jim Blandy committed
134 135 136

(defun delete-indentation (&optional arg)
  "Join this line to previous and fix up whitespace at join.
137
If there is a fill prefix, delete it from the beginning of this line.
Jim Blandy's avatar
Jim Blandy committed
138 139 140 141 142 143 144
With argument, join this line to following line."
  (interactive "*P")
  (beginning-of-line)
  (if arg (forward-line 1))
  (if (eq (preceding-char) ?\n)
      (progn
	(delete-region (point) (1- (point)))
145 146 147
	;; If the second line started with the fill prefix,
	;; delete the prefix.
	(if (and fill-prefix
148
		 (<= (+ (point) (length fill-prefix)) (point-max))
149 150 151 152
		 (string= fill-prefix
			  (buffer-substring (point)
					    (+ (point) (length fill-prefix)))))
	    (delete-region (point) (+ (point) (length fill-prefix))))
Jim Blandy's avatar
Jim Blandy committed
153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184
	(fixup-whitespace))))

(defun fixup-whitespace ()
  "Fixup white space between objects around point.
Leave one space or none, according to the context."
  (interactive "*")
  (save-excursion
    (delete-horizontal-space)
    (if (or (looking-at "^\\|\\s)")
	    (save-excursion (forward-char -1)
			    (looking-at "$\\|\\s(\\|\\s'")))
	nil
      (insert ?\ ))))

(defun delete-horizontal-space ()
  "Delete all spaces and tabs around point."
  (interactive "*")
  (skip-chars-backward " \t")
  (delete-region (point) (progn (skip-chars-forward " \t") (point))))

(defun just-one-space ()
  "Delete all spaces and tabs around point, leaving one space."
  (interactive "*")
  (skip-chars-backward " \t")
  (if (= (following-char) ? )
      (forward-char 1)
    (insert ? ))
  (delete-region (point) (progn (skip-chars-forward " \t") (point))))

(defun delete-blank-lines ()
  "On blank line, delete all surrounding blank lines, leaving just one.
On isolated blank line, delete that one.
185
On nonblank line, delete any immediately following blank lines."
Jim Blandy's avatar
Jim Blandy committed
186 187 188 189 190
  (interactive "*")
  (let (thisblank singleblank)
    (save-excursion
      (beginning-of-line)
      (setq thisblank (looking-at "[ \t]*$"))
Jim Blandy's avatar
Jim Blandy committed
191
      ;; Set singleblank if there is just one blank line here.
Jim Blandy's avatar
Jim Blandy committed
192 193 194 195 196 197
      (setq singleblank
	    (and thisblank
		 (not (looking-at "[ \t]*\n[ \t]*$"))
		 (or (bobp)
		     (progn (forward-line -1)
			    (not (looking-at "[ \t]*$")))))))
Jim Blandy's avatar
Jim Blandy committed
198
    ;; Delete preceding blank lines, and this one too if it's the only one.
Jim Blandy's avatar
Jim Blandy committed
199 200 201 202 203 204 205 206
    (if thisblank
	(progn
	  (beginning-of-line)
	  (if singleblank (forward-line 1))
	  (delete-region (point)
			 (if (re-search-backward "[^ \t\n]" nil t)
			     (progn (forward-line 1) (point))
			   (point-min)))))
Jim Blandy's avatar
Jim Blandy committed
207 208
    ;; Delete following blank lines, unless the current line is blank
    ;; and there are no following blank lines.
Jim Blandy's avatar
Jim Blandy committed
209 210 211 212 213 214 215
    (if (not (and thisblank singleblank))
	(save-excursion
	  (end-of-line)
	  (forward-line 1)
	  (delete-region (point)
			 (if (re-search-forward "[^ \t\n]" nil t)
			     (progn (beginning-of-line) (point))
Jim Blandy's avatar
Jim Blandy committed
216 217 218 219 220
			   (point-max)))))
    ;; Handle the special case where point is followed by newline and eob.
    ;; Delete the line, leaving point at eob.
    (if (looking-at "^[ \t]*\n\\'")
	(delete-region (point) (point-max)))))
Jim Blandy's avatar
Jim Blandy committed
221 222 223 224 225 226 227 228 229

(defun back-to-indentation ()
  "Move point to the first non-whitespace character on this line."
  (interactive)
  (beginning-of-line 1)
  (skip-chars-forward " \t"))

(defun newline-and-indent ()
  "Insert a newline, then indent according to major mode.
230
Indentation is done using the value of `indent-line-function'.
Jim Blandy's avatar
Jim Blandy committed
231
In programming language modes, this is the same as TAB.
232
In some text modes, where TAB inserts a tab, this command indents to the
233
column specified by the function `current-left-margin'."
Jim Blandy's avatar
Jim Blandy committed
234 235
  (interactive "*")
  (delete-region (point) (progn (skip-chars-backward " \t") (point)))
Jim Blandy's avatar
Jim Blandy committed
236
  (newline)
Jim Blandy's avatar
Jim Blandy committed
237 238 239 240 241
  (indent-according-to-mode))

(defun reindent-then-newline-and-indent ()
  "Reindent current line, insert newline, then indent the new line.
Indentation of both lines is done according to the current major mode,
242
which means calling the current value of `indent-line-function'.
Jim Blandy's avatar
Jim Blandy committed
243 244
In programming language modes, this is the same as TAB.
In some text modes, where TAB inserts a tab, this indents to the
245
column specified by the function `current-left-margin'."
Jim Blandy's avatar
Jim Blandy committed
246 247 248 249
  (interactive "*")
  (save-excursion
    (delete-region (point) (progn (skip-chars-backward " \t") (point)))
    (indent-according-to-mode))
Jim Blandy's avatar
Jim Blandy committed
250
  (newline)
Jim Blandy's avatar
Jim Blandy committed
251 252
  (indent-according-to-mode))

253 254 255 256 257 258 259 260 261 262 263 264
;; Internal subroutine of delete-char
(defun kill-forward-chars (arg)
  (if (listp arg) (setq arg (car arg)))
  (if (eq arg '-) (setq arg -1))
  (kill-region (point) (+ (point) arg)))

;; Internal subroutine of backward-delete-char
(defun kill-backward-chars (arg)
  (if (listp arg) (setq arg (car arg)))
  (if (eq arg '-) (setq arg -1))
  (kill-region (point) (- (point) arg)))

Jim Blandy's avatar
Jim Blandy committed
265 266 267 268
(defun backward-delete-char-untabify (arg &optional killp)
  "Delete characters backward, changing tabs into spaces.
Delete ARG chars, and kill (save in kill ring) if KILLP is non-nil.
Interactively, ARG is the prefix arg (default 1)
269
and KILLP is t if a prefix arg was specified."
Jim Blandy's avatar
Jim Blandy committed
270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298
  (interactive "*p\nP")
  (let ((count arg))
    (save-excursion
      (while (and (> count 0) (not (bobp)))
	(if (= (preceding-char) ?\t)
	    (let ((col (current-column)))
	      (forward-char -1)
	      (setq col (- col (current-column)))
	      (insert-char ?\ col)
	      (delete-char 1)))
	(forward-char -1)
	(setq count (1- count)))))
  (delete-backward-char arg killp)
  ;; In overwrite mode, back over columns while clearing them out,
  ;; unless at end of line.
  (and overwrite-mode (not (eolp))
       (save-excursion (insert-char ?\  arg))))

(defun zap-to-char (arg char)
  "Kill up to and including ARG'th occurrence of CHAR.
Goes backward if ARG is negative; error if CHAR not found."
  (interactive "p\ncZap to char: ")
  (kill-region (point) (progn
			 (search-forward (char-to-string char) nil nil arg)
;			 (goto-char (if (> arg 0) (1- (point)) (1+ (point))))
			 (point))))

(defun beginning-of-buffer (&optional arg)
  "Move point to the beginning of the buffer; leave mark at previous position.
299 300 301 302
With arg N, put point N/10 of the way from the beginning.

If the buffer is narrowed, this command uses the beginning and size
of the accessible part of the buffer.
303 304

Don't use this command in Lisp programs!
Jim Blandy's avatar
Jim Blandy committed
305 306 307
\(goto-char (point-min)) is faster and avoids clobbering the mark."
  (interactive "P")
  (push-mark)
308 309 310 311 312 313 314 315 316
  (let ((size (- (point-max) (point-min))))
    (goto-char (if arg
		   (+ (point-min)
		      (if (> size 10000)
			  ;; Avoid overflow for large buffer sizes!
			  (* (prefix-numeric-value arg)
			     (/ size 10))
			(/ (+ 10 (* size (prefix-numeric-value arg))) 10)))
		 (point-min))))
Jim Blandy's avatar
Jim Blandy committed
317 318 319 320
  (if arg (forward-line 1)))

(defun end-of-buffer (&optional arg)
  "Move point to the end of the buffer; leave mark at previous position.
321 322 323 324
With arg N, put point N/10 of the way from the end.

If the buffer is narrowed, this command uses the beginning and size
of the accessible part of the buffer.
325 326

Don't use this command in Lisp programs!
Jim Blandy's avatar
Jim Blandy committed
327 328 329
\(goto-char (point-max)) is faster and avoids clobbering the mark."
  (interactive "P")
  (push-mark)
330 331 332 333 334 335 336 337 338
  (let ((size (- (point-max) (point-min))))
    (goto-char (if arg
		   (- (point-max)
		      (if (> size 10000)
			  ;; Avoid overflow for large buffer sizes!
			  (* (prefix-numeric-value arg)
			     (/ size 10))
			(/ (* size (prefix-numeric-value arg)) 10)))
		 (point-max))))
Eric S. Raymond's avatar
Eric S. Raymond committed
339 340
  ;; If we went to a place in the middle of the buffer,
  ;; adjust it to the beginning of a line.
Jim Blandy's avatar
Jim Blandy committed
341
  (if arg (forward-line 1)
Eric S. Raymond's avatar
Eric S. Raymond committed
342 343 344 345 346 347 348
    ;; If the end of the buffer is not already on the screen,
    ;; then scroll specially to put it near, but not at, the bottom.
    (if (let ((old-point (point)))
	  (save-excursion
		    (goto-char (window-start))
		    (vertical-motion (window-height))
		    (< (point) old-point)))
349 350 351
	(progn
	  (overlay-recenter (point))
	  (recenter -3)))))
Jim Blandy's avatar
Jim Blandy committed
352 353

(defun mark-whole-buffer ()
Jim Blandy's avatar
Jim Blandy committed
354 355 356 357
  "Put point at beginning and mark at end of buffer.
You probably should not use this function in Lisp programs;
it is usually a mistake for a Lisp function to use any subroutine
that uses or sets the mark."
Jim Blandy's avatar
Jim Blandy committed
358 359
  (interactive)
  (push-mark (point))
360
  (push-mark (point-max) nil t)
Jim Blandy's avatar
Jim Blandy committed
361 362 363
  (goto-char (point-min)))

(defun count-lines-region (start end)
364
  "Print number of lines and characters in the region."
Jim Blandy's avatar
Jim Blandy committed
365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381
  (interactive "r")
  (message "Region has %d lines, %d characters"
	   (count-lines start end) (- end start)))

(defun what-line ()
  "Print the current line number (in the buffer) of point."
  (interactive)
  (save-restriction
    (widen)
    (save-excursion
      (beginning-of-line)
      (message "Line %d"
	       (1+ (count-lines 1 (point)))))))

(defun count-lines (start end)
  "Return number of lines between START and END.
This is usually the number of newlines between them,
382
but can be one more if START is not equal to END
Jim Blandy's avatar
Jim Blandy committed
383
and the greater of them is not at the start of a line."
384 385 386 387 388 389
  (save-excursion
    (save-restriction
      (narrow-to-region start end)
      (goto-char (point-min))
      (if (eq selective-display t)
	  (save-match-data
390 391 392 393 394
	    (let ((done 0))
	      (while (re-search-forward "[\n\C-m]" nil t 40)
		(setq done (+ 40 done)))
	      (while (re-search-forward "[\n\C-m]" nil t 1)
		(setq done (+ 1 done)))
395 396 397 398
	      (goto-char (point-max))
	      (if (and (/= start end)
		       (not (bolp)))
		  (1+ done)
399 400
		done)))
	(- (buffer-size) (forward-line (buffer-size)))))))
Jim Blandy's avatar
Jim Blandy committed
401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424

(defun what-cursor-position ()
  "Print info on cursor position (on screen and within buffer)."
  (interactive)
  (let* ((char (following-char))
	 (beg (point-min))
	 (end (point-max))
         (pos (point))
	 (total (buffer-size))
	 (percent (if (> total 50000)
		      ;; Avoid overflow from multiplying by 100!
		      (/ (+ (/ total 200) (1- pos)) (max (/ total 100) 1))
		    (/ (+ (/ total 2) (* 100 (1- pos))) (max total 1))))
	 (hscroll (if (= (window-hscroll) 0)
		      ""
		    (format " Hscroll=%d" (window-hscroll))))
	 (col (current-column)))
    (if (= pos end)
	(if (or (/= beg 1) (/= end (1+ total)))
	    (message "point=%d of %d(%d%%) <%d - %d>  column %d %s"
		     pos total percent beg end col hscroll)
	  (message "point=%d of %d(%d%%)  column %d %s"
		   pos total percent col hscroll))
      (if (or (/= beg 1) (/= end (1+ total)))
425 426 427 428
	  (message "Char: %s (0%o, %d, 0x%x)  point=%d of %d(%d%%) <%d - %d>  column %d %s"
		   (single-key-description char) char char char pos total percent beg end col hscroll)
	(message "Char: %s (0%o, %d, 0x%x)  point=%d of %d(%d%%)  column %d %s"
		 (single-key-description char) char char char pos total percent col hscroll)))))
Jim Blandy's avatar
Jim Blandy committed
429 430 431 432 433 434 435

(defun fundamental-mode ()
  "Major mode not specialized for anything in particular.
Other major modes are defined by comparison with this one."
  (interactive)
  (kill-all-local-variables))

436
(defvar read-expression-map (cons 'keymap minibuffer-local-map)
437 438 439
  "Minibuffer keymap used for reading Lisp expressions.")
(define-key read-expression-map "\M-\t" 'lisp-complete-symbol)

Jim Blandy's avatar
Jim Blandy committed
440 441
(put 'eval-expression 'disabled t)

442 443 444
(defvar read-expression-history nil)

;; We define this, rather than making `eval' interactive,
Jim Blandy's avatar
Jim Blandy committed
445 446 447
;; for the sake of completion of names like eval-region, eval-current-buffer.
(defun eval-expression (expression)
  "Evaluate EXPRESSION and print value in minibuffer.
448
Value is also consed on to front of the variable `values'."
449
  (interactive
450 451 452
   (list (read-from-minibuffer "Eval: "
			       nil read-expression-map t
			       'read-expression-history)))
Jim Blandy's avatar
Jim Blandy committed
453 454 455 456 457 458 459
  (setq values (cons (eval expression) values))
  (prin1 (car values) t))

(defun edit-and-eval-command (prompt command)
  "Prompting with PROMPT, let user edit COMMAND and eval result.
COMMAND is a Lisp expression.  Let user edit that expression in
the minibuffer, then read and evaluate the result."
460 461 462 463
  (let ((command (read-from-minibuffer prompt
				       (prin1-to-string command)
				       read-expression-map t
				       '(command-history . 1))))
464 465 466 467 468 469 470 471 472
    ;; If command was added to command-history as a string,
    ;; get rid of that.  We want only evallable expressions there.
    (if (stringp (car command-history))
	(setq command-history (cdr command-history)))

    ;; If command to be redone does not match front of history,
    ;; add it to the history.
    (or (equal command (car command-history))
	(setq command-history (cons command command-history)))
Jim Blandy's avatar
Jim Blandy committed
473 474
    (eval command)))

475
(defun repeat-complex-command (arg)
Jim Blandy's avatar
Jim Blandy committed
476 477 478 479 480 481
  "Edit and re-evaluate last complex command, or ARGth from last.
A complex command is one which used the minibuffer.
The command is placed in the minibuffer as a Lisp form for editing.
The result is executed, repeating the command as changed.
If the command has been changed or is not the most recent previous command
it is added to the front of the command history.
482 483
You can use the minibuffer history commands \\<minibuffer-local-map>\\[next-history-element] and \\[previous-history-element]
to get different commands to edit and resubmit."
Jim Blandy's avatar
Jim Blandy committed
484
  (interactive "p")
485
  (let ((elt (nth (1- arg) command-history))
486
	(minibuffer-history-position arg)
487
	(minibuffer-history-sexp-flag t)
Jim Blandy's avatar
Jim Blandy committed
488 489
	newcmd)
    (if elt
490
	(progn
491
	  (setq newcmd
492 493 494 495
		(let ((print-level nil))
		  (read-from-minibuffer
		   "Redo: " (prin1-to-string elt) read-expression-map t
		   (cons 'command-history arg))))
496

497 498 499 500 501 502 503 504 505
	  ;; If command was added to command-history as a string,
	  ;; get rid of that.  We want only evallable expressions there.
	  (if (stringp (car command-history))
	      (setq command-history (cdr command-history)))

	  ;; If command to be redone does not match front of history,
	  ;; add it to the history.
	  (or (equal newcmd (car command-history))
	      (setq command-history (cons newcmd command-history)))
Jim Blandy's avatar
Jim Blandy committed
506 507
	  (eval newcmd))
      (ding))))
508

509 510 511 512 513
(defvar minibuffer-history nil
  "Default minibuffer history list.
This is used for all minibuffer input
except when an alternate history list is specified.")
(defvar minibuffer-history-sexp-flag nil
514
  "Non-nil when doing history operations on `command-history'.
515 516
More generally, indicates that the history list being acted on
contains expressions rather than strings.")
517 518
(setq minibuffer-history-variable 'minibuffer-history)
(setq minibuffer-history-position nil)
519
(defvar minibuffer-history-search-history nil)
520

Jim Blandy's avatar
Jim Blandy committed
521
(mapcar
522 523 524 525 526 527 528 529 530 531
 (lambda (key-and-command)
   (mapcar
    (lambda (keymap-and-completionp)
      ;; Arg is (KEYMAP-SYMBOL . COMPLETION-MAP-P).
      ;; If the cdr of KEY-AND-COMMAND (the command) is a cons,
      ;; its car is used if COMPLETION-MAP-P is nil, its cdr if it is t.
      (define-key (symbol-value (car keymap-and-completionp))
	(car key-and-command)
	(let ((command (cdr key-and-command)))
	  (if (consp command)
532 533 534 535
	      ;; (and ... nil) => ... turns back on the completion-oriented
	      ;; history commands which rms turned off since they seem to
	      ;; do things he doesn't like.
	      (if (and (cdr keymap-and-completionp) nil) ;XXX turned off
536
		  (progn (error "EMACS BUG!") (cdr command))
537 538 539 540 541 542 543
		(car command))
	    command))))
    '((minibuffer-local-map . nil)
      (minibuffer-local-ns-map . nil)
      (minibuffer-local-completion-map . t)
      (minibuffer-local-must-match-map . t)
      (read-expression-map . nil))))
544 545 546 547
 '(("\en" . (next-history-element . next-complete-history-element))
   ([next] . (next-history-element . next-complete-history-element))
   ("\ep" . (previous-history-element . previous-complete-history-element))
   ([prior] . (previous-history-element . previous-complete-history-element))
Jim Blandy's avatar
Jim Blandy committed
548 549
   ("\er" . previous-matching-history-element)
   ("\es" . next-matching-history-element)))
550 551

(defun previous-matching-history-element (regexp n)
552 553 554 555 556
  "Find the previous history element that matches REGEXP.
\(Previous history elements refer to earlier actions.)
With prefix argument N, search for Nth previous match.
If N is negative, find the next or Nth next match."
  (interactive
557 558 559 560 561 562 563 564 565
   (let* ((enable-recursive-minibuffers t)
	  (minibuffer-history-sexp-flag nil)
	  (regexp (read-from-minibuffer "Previous element matching (regexp): "
					nil
					minibuffer-local-map
					nil
					'minibuffer-history-search-history)))
     ;; Use the last regexp specified, by default, if input is empty.
     (list (if (string= regexp "")
566 567 568
	       (if minibuffer-history-search-history
		   (car minibuffer-history-search-history)
		 (error "No previous history search regexp"))
569
	     regexp)
570
	   (prefix-numeric-value current-prefix-arg))))
571
  (let ((history (symbol-value minibuffer-history-variable))
572
	prevpos
573 574 575 576 577 578
	(pos minibuffer-history-position))
    (while (/= n 0)
      (setq prevpos pos)
      (setq pos (min (max 1 (+ pos (if (< n 0) -1 1))) (length history)))
      (if (= pos prevpos)
	  (error (if (= pos 1)
579 580
		     "No later matching history item"
		   "No earlier matching history item")))
581 582
      (if (string-match regexp
			(if minibuffer-history-sexp-flag
583 584
			    (let ((print-level nil))
			      (prin1-to-string (nth (1- pos) history)))
585
			  (nth (1- pos) history)))
586
	  (setq n (+ n (if (< n 0) 1 -1)))))
587 588 589 590
    (setq minibuffer-history-position pos)
    (erase-buffer)
    (let ((elt (nth (1- pos) history)))
      (insert (if minibuffer-history-sexp-flag
591 592
		  (let ((print-level nil))
		    (prin1-to-string elt))
593
		elt)))
594 595 596 597
      (goto-char (point-min)))
  (if (or (eq (car (car command-history)) 'previous-matching-history-element)
	  (eq (car (car command-history)) 'next-matching-history-element))
      (setq command-history (cdr command-history))))
598 599

(defun next-matching-history-element (regexp n)
600 601 602 603 604
  "Find the next history element that matches REGEXP.
\(The next history element refers to a more recent action.)
With prefix argument N, search for Nth next match.
If N is negative, find the previous or Nth previous match."
  (interactive
605 606 607 608 609 610 611 612 613 614 615 616
   (let* ((enable-recursive-minibuffers t)
	  (minibuffer-history-sexp-flag nil)
	  (regexp (read-from-minibuffer "Next element matching (regexp): "
					nil
					minibuffer-local-map
					nil
					'minibuffer-history-search-history)))
     ;; Use the last regexp specified, by default, if input is empty.
     (list (if (string= regexp "")
	       (setcar minibuffer-history-search-history
		       (nth 1 minibuffer-history-search-history))
	     regexp)
617
	   (prefix-numeric-value current-prefix-arg))))
618
  (previous-matching-history-element regexp (- n)))
Jim Blandy's avatar
Jim Blandy committed
619

620 621
(defun next-history-element (n)
  "Insert the next element of the minibuffer history into the minibuffer."
Jim Blandy's avatar
Jim Blandy committed
622
  (interactive "p")
623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642
  (or (zerop n)
      (let ((narg (min (max 1 (- minibuffer-history-position n))
		       (length (symbol-value minibuffer-history-variable)))))
	    (if (or (zerop narg)
		    (= minibuffer-history-position narg))
		(error (if (if (zerop narg)
			       (> n 0)
			     (= minibuffer-history-position 1))
		       "End of history; no next item"
		     "Beginning of history; no preceding item"))
	  (erase-buffer)
	  (setq minibuffer-history-position narg)
	  (let ((elt (nth (1- minibuffer-history-position)
			  (symbol-value minibuffer-history-variable))))
	    (insert
	     (if minibuffer-history-sexp-flag
		 (let ((print-level nil))
		   (prin1-to-string elt))
	       elt)))
	  (goto-char (point-min))))))
Jim Blandy's avatar
Jim Blandy committed
643

644
(defun previous-history-element (n)
Richard M. Stallman's avatar
Richard M. Stallman committed
645
  "Inserts the previous element of the minibuffer history into the minibuffer."
Jim Blandy's avatar
Jim Blandy committed
646
  (interactive "p")
647
  (next-history-element (- n)))
648 649

(defun next-complete-history-element (n)
650
  "Get next element of history which is a completion of minibuffer contents."
651
  (interactive "p")
652 653 654 655 656 657 658
  (let ((point-at-start (point)))
    (next-matching-history-element
     (concat "^" (regexp-quote (buffer-substring (point-min) (point)))) n)
    ;; next-matching-history-element always puts us at (point-min).
    ;; Move to the position we were at before changing the buffer contents.
    ;; This is still sensical, because the text before point has not changed.
    (goto-char point-at-start)))
659 660

(defun previous-complete-history-element (n)
661 662
  "\
Get previous element of history which is a completion of minibuffer contents."
663 664
  (interactive "p")
  (next-complete-history-element (- n)))
665

Jim Blandy's avatar
Jim Blandy committed
666 667 668
(defun goto-line (arg)
  "Goto line ARG, counting from line 1 at beginning of buffer."
  (interactive "NGoto line: ")
669
  (setq arg (prefix-numeric-value arg))
Jim Blandy's avatar
Jim Blandy committed
670 671 672 673 674 675 676 677
  (save-restriction
    (widen)
    (goto-char 1)
    (if (eq selective-display t)
	(re-search-forward "[\n\C-m]" nil 'end (1- arg))
      (forward-line (1- arg)))))

;Put this on C-x u, so we can force that rather than C-_ into startup msg
678
(define-function 'advertised-undo 'undo)
Jim Blandy's avatar
Jim Blandy committed
679 680 681 682 683 684

(defun undo (&optional arg)
  "Undo some previous changes.
Repeat this command to undo more changes.
A numeric argument serves as a repeat count."
  (interactive "*p")
685 686 687
  ;; If we don't get all the way thru, make last-command indicate that
  ;; for the following command.
  (setq this-command t)
688 689
  (let ((modified (buffer-modified-p))
	(recent-save (recent-auto-save-p)))
Jim Blandy's avatar
Jim Blandy committed
690 691
    (or (eq (selected-window) (minibuffer-window))
	(message "Undo!"))
Jim Blandy's avatar
Jim Blandy committed
692 693 694 695
    (or (eq last-command 'undo)
	(progn (undo-start)
	       (undo-more 1)))
    (undo-more (or arg 1))
696 697 698 699 700 701 702 703 704 705
    ;; Don't specify a position in the undo record for the undo command.
    ;; Instead, undoing this should move point to where the change is.
    (let ((tail buffer-undo-list)
	  done)
      (while (and tail (not done) (not (null (car tail))))
	(if (integerp (car tail))
	    (progn
	      (setq done t)
	      (setq buffer-undo-list (delq (car tail) buffer-undo-list))))
	(setq tail (cdr tail))))
Jim Blandy's avatar
Jim Blandy committed
706
    (and modified (not (buffer-modified-p))
707 708 709
	 (delete-auto-save-file-if-necessary recent-save)))
  ;; If we do get all the way thru, make this-command indicate that.
  (setq this-command 'undo))
Jim Blandy's avatar
Jim Blandy committed
710

711 712 713
(defvar pending-undo-list nil
  "Within a run of consecutive undo commands, list remaining to be undone.")

Jim Blandy's avatar
Jim Blandy committed
714
(defun undo-start ()
715 716
  "Set `pending-undo-list' to the front of the undo list.
The next call to `undo-more' will undo the most recently made change."
Jim Blandy's avatar
Jim Blandy committed
717 718 719 720 721 722
  (if (eq buffer-undo-list t)
      (error "No undo information in this buffer"))
  (setq pending-undo-list buffer-undo-list))

(defun undo-more (count)
  "Undo back N undo-boundaries beyond what was already undone recently.
723 724
Call `undo-start' to get ready to undo recent changes,
then call `undo-more' one or more times to undo them."
Jim Blandy's avatar
Jim Blandy committed
725 726 727 728
  (or pending-undo-list
      (error "No further undo information"))
  (setq pending-undo-list (primitive-undo count pending-undo-list)))

729 730 731
(defvar shell-command-history nil
  "History list for some commands that read shell commands.")

732 733 734
(defvar shell-command-switch "-c"
  "Switch used to have the shell execute its command line argument.")

735
(defun shell-command (command &optional output-buffer)
Jim Blandy's avatar
Jim Blandy committed
736
  "Execute string COMMAND in inferior shell; display output, if any.
737

Jim Blandy's avatar
Jim Blandy committed
738
If COMMAND ends in ampersand, execute it asynchronously.
739 740 741 742 743 744 745 746 747
The output appears in the buffer `*Async Shell Command*'.

Otherwise, COMMAND is executed synchronously.  The output appears
in the buffer `*Shell Command Output*'.
If the output is one line, it is displayed in the echo area *as well*,
but it is nonetheless available in buffer `*Shell Command Output*',
even though that buffer is not automatically displayed.
If there is no output, or if output is inserted in the current buffer,
then `*Shell Command Output*' is deleted.
748 749 750 751 752 753 754

The optional second argument OUTPUT-BUFFER, if non-nil,
says to put the output in some other buffer.
If OUTPUT-BUFFER is a buffer or buffer name, put the output there.
If OUTPUT-BUFFER is not a buffer and not nil,
insert output in current buffer.  (This cannot be done asynchronously.)
In either case, the output is inserted after point (leaving mark after it)."
755 756 757
  (interactive (list (read-from-minibuffer "Shell command: "
					   nil nil nil 'shell-command-history)
		     current-prefix-arg))
758 759
  (if (and output-buffer
	   (not (or (bufferp output-buffer)  (stringp output-buffer))))
Jim Blandy's avatar
Jim Blandy committed
760 761 762 763 764 765 766 767
      (progn (barf-if-buffer-read-only)
	     (push-mark)
	     ;; We do not use -f for csh; we will not support broken use of
	     ;; .cshrcs.  Even the BSD csh manual says to use
	     ;; "if ($?prompt) exit" before things which are not useful
	     ;; non-interactively.  Besides, if someone wants their other
	     ;; aliases for shell commands then they can still have them.
	     (call-process shell-file-name nil t nil
768
			   shell-command-switch command)
769 770 771 772 773 774
	     ;; This is like exchange-point-and-mark, but doesn't activate the mark.
	     ;; It is cleaner to avoid activation, even though the command
	     ;; loop would deactivate the mark because we inserted text.
	     (goto-char (prog1 (mark t)
			  (set-marker (mark-marker) (point)
				      (current-buffer)))))
Jim Blandy's avatar
Jim Blandy committed
775 776 777 778 779
    ;; Preserve the match data in case called from a program.
    (let ((data (match-data)))
      (unwind-protect
	  (if (string-match "[ \t]*&[ \t]*$" command)
	      ;; Command ending with ampersand means asynchronous.
780
	      (let ((buffer (get-buffer-create
781
			     (or output-buffer "*Asynch Shell Command*")))
Jim Blandy's avatar
Jim Blandy committed
782 783 784 785 786 787 788 789 790 791 792 793
		    (directory default-directory)
		    proc)
		;; Remove the ampersand.
		(setq command (substring command 0 (match-beginning 0)))
		;; If will kill a process, query first.
		(setq proc (get-buffer-process buffer))
		(if proc
		    (if (yes-or-no-p "A command is running.  Kill it? ")
			(kill-process proc)
		      (error "Shell command in progress")))
		(save-excursion
		  (set-buffer buffer)
794
		  (setq buffer-read-only nil)
Jim Blandy's avatar
Jim Blandy committed
795 796 797 798
		  (erase-buffer)
		  (display-buffer buffer)
		  (setq default-directory directory)
		  (setq proc (start-process "Shell" buffer 
799 800
					    shell-file-name 
					    shell-command-switch command))
801
		  (setq mode-line-process '(":%s"))
Jim Blandy's avatar
Jim Blandy committed
802 803 804 805 806 807 808 809 810
		  (set-process-sentinel proc 'shell-command-sentinel)
		  (set-process-filter proc 'shell-command-filter)
		  ))
	    (shell-command-on-region (point) (point) command nil))
	(store-match-data data)))))

;; We have a sentinel to prevent insertion of a termination message
;; in the buffer itself.
(defun shell-command-sentinel (process signal)
811 812
  (if (and (memq (process-status process) '(exit signal))
	   (buffer-name (process-buffer process)))
Jim Blandy's avatar
Jim Blandy committed
813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832
      (progn
	(message "%s: %s." 
		 (car (cdr (cdr (process-command process))))
		 (substring signal 0 -1))
	(save-excursion
	  (set-buffer (process-buffer process))
	  (setq mode-line-process nil))
	(delete-process process))))

(defun shell-command-filter (proc string)
  ;; Do save-excursion by hand so that we can leave point numerically unchanged
  ;; despite an insertion immediately after it.
  (let* ((obuf (current-buffer))
	 (buffer (process-buffer proc))
	 opoint
	 (window (get-buffer-window buffer))
	 (pos (window-start window)))
    (unwind-protect
	(progn
	  (set-buffer buffer)
833 834
	  (or (= (point) (point-max))
	      (setq opoint (point)))
Jim Blandy's avatar
Jim Blandy committed
835 836 837 838 839
	  (goto-char (point-max))
	  (insert-before-markers string))
      ;; insert-before-markers moved this marker: set it back.
      (set-window-start window pos)
      ;; Finish our save-excursion.
840 841
      (if opoint
	  (goto-char opoint))
Jim Blandy's avatar
Jim Blandy committed
842 843
      (set-buffer obuf))))

844
(defun shell-command-on-region (start end command
845
				      &optional output-buffer replace)
Jim Blandy's avatar
Jim Blandy committed
846 847 848
  "Execute string COMMAND in inferior shell with region as input.
Normally display output (if any) in temp buffer `*Shell Command Output*';
Prefix arg means replace the region with it.
849 850 851

The noninteractive arguments are START, END, COMMAND, OUTPUT-BUFFER, REPLACE.
If REPLACE is non-nil, that means insert the output
852
in place of text from START to END, putting point and mark around it.
Jim Blandy's avatar
Jim Blandy committed
853 854 855

If the output is one line, it is displayed in the echo area,
but it is nonetheless available in buffer `*Shell Command Output*'
856
even though that buffer is not automatically displayed.
857
If there is no output, or if output is inserted in the current buffer,
858
then `*Shell Command Output*' is deleted.
859

860 861
If the optional fourth argument OUTPUT-BUFFER is non-nil,
that says to put the output in some other buffer.
862 863 864 865
If OUTPUT-BUFFER is a buffer or buffer name, put the output there.
If OUTPUT-BUFFER is not a buffer and not nil,
insert output in the current buffer.
In either case, the output is inserted after point (leaving mark after it)."
866 867 868 869 870 871 872 873 874 875
  (interactive (let ((string
		      ;; Do this before calling region-beginning
		      ;; and region-end, in case subprocess output
		      ;; relocates them while we are in the minibuffer.
		      (read-from-minibuffer "Shell command on region: "
					    nil nil nil
					    'shell-command-history)))
		 (list (region-beginning) (region-end)
		       string
		       current-prefix-arg
876 877 878 879
		       current-prefix-arg)))
  (if (or replace
	  (and output-buffer
	       (not (or (bufferp output-buffer) (stringp output-buffer)))))
Jim Blandy's avatar
Jim Blandy committed
880
      ;; Replace specified region with output from command.
881
      (let ((swap (and replace (< (point) (mark)))))
882 883
	;; Don't muck with mark unless REPLACE says we should.
	(goto-char start)
884
	(and replace (push-mark))
Jim Blandy's avatar
Jim Blandy committed
885
	(call-process-region start end shell-file-name t t nil
886
			     shell-command-switch command)
887 888 889
	(let ((shell-buffer (get-buffer "*Shell Command Output*")))
	  (and shell-buffer (not (eq shell-buffer (current-buffer)))
	       (kill-buffer shell-buffer)))
890
	;; Don't muck with mark unless REPLACE says we should.
891
	(and replace swap (exchange-point-and-mark)))
Jim Blandy's avatar
Jim Blandy committed
892 893
    ;; No prefix argument: put the output in a temp buffer,
    ;; replacing its entire contents.
894 895
    (let ((buffer (get-buffer-create
		   (or output-buffer "*Shell Command Output*")))
896 897 898 899 900 901
	  (success nil))
      (unwind-protect
	  (if (eq buffer (current-buffer))
	      ;; If the input is the same buffer as the output,
	      ;; delete everything but the specified region,
	      ;; then replace that region with the output.
902 903
	      (progn (setq buffer-read-only nil)
		     (delete-region end (point-max))
904 905 906
		     (delete-region (point-min) start)
		     (call-process-region (point-min) (point-max)
					  shell-file-name t t nil
907
					  shell-command-switch command)
908 909 910 911
		     (setq success t))
	    ;; Clear the output buffer, then run the command with output there.
	    (save-excursion
	      (set-buffer buffer)
912
	      (setq buffer-read-only nil)
913 914 915
	      (erase-buffer))
	    (call-process-region start end shell-file-name
				 nil buffer nil
916
				 shell-command-switch command)
917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933
	    (setq success t))
	;; Report the amount of output.
	(let ((lines (save-excursion
		       (set-buffer buffer)
		       (if (= (buffer-size) 0)
			   0
			 (count-lines (point-min) (point-max))))))
	  (cond ((= lines 0)
		 (if success
		     (message "(Shell command completed with no output)"))
		 (kill-buffer buffer))
		((and success (= lines 1))
		 (message "%s"
			  (save-excursion
			    (set-buffer buffer)
			    (goto-char (point-min))
			    (buffer-substring (point)
934
					      (progn (end-of-line) (point))))))
935 936
		(t 
		 (set-window-start (display-buffer buffer) 1))))))))
Jim Blandy's avatar
Jim Blandy committed
937

938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956
(defconst universal-argument-map
  (let ((map (make-sparse-keymap)))
    (define-key map [t] 'universal-argument-other-key)
    (define-key map [switch-frame] nil)
    (define-key map [?\C-u] 'universal-argument-more)
    (define-key map [?-] 'universal-argument-minus)
    (define-key map [?0] 'digit-argument)
    (define-key map [?1] 'digit-argument)
    (define-key map [?2] 'digit-argument)
    (define-key map [?3] 'digit-argument)
    (define-key map [?4] 'digit-argument)
    (define-key map [?5] 'digit-argument)
    (define-key map [?6] 'digit-argument)
    (define-key map [?7] 'digit-argument)
    (define-key map [?8] 'digit-argument)
    (define-key map [?9] 'digit-argument)
    map)
  "Keymap used while processing \\[universal-argument].")

957 958 959 960 961 962 963
(defun universal-argument ()
  "Begin a numeric argument for the following command.
Digits or minus sign following \\[universal-argument] make up the numeric argument.
\\[universal-argument] following the digits or minus sign ends the argument.
\\[universal-argument] without digits or minus sign provides 4 as argument.
Repeating \\[universal-argument] without digits or minus sign
 multiplies the argument by 4 each time."
964 965 966
  (interactive)
  (setq prefix-arg (list 4))
  (setq overriding-terminal-local-map universal-argument-map))
967

968 969 970
;; A subsequent C-u means to multiply the factor by 4 if we've typed
;; nothing but C-u's; otherwise it means to terminate the prefix arg.
(defun universal-argument-more (arg)
971
  (interactive "P")
972 973 974 975
  (if (consp arg)
      (setq prefix-arg (list (* 4 (car arg))))
    (setq prefix-arg arg)
    (setq overriding-terminal-local-map nil)))
976 977 978 979 980

(defun negative-argument (arg)
  "Begin a negative numeric argument for the next command.
\\[universal-argument] following digits or minus sign ends the argument."
  (interactive "P")
981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016
  (cond ((integerp arg)
	 (setq prefix-arg (- arg)))
	((eq arg '-)
	 (setq prefix-arg nil))
	(t
	 (setq prefix-arg '-))))

(defun digit-argument (arg)
  "Part of the numeric argument for the next command.
\\[universal-argument] following digits or minus sign ends the argument."
  (interactive "P")
  (let ((digit (- (logand last-command-char ?\177) ?0)))
    (cond ((integerp arg)
	   (setq prefix-arg (+ (* arg 10)
			       (if (< arg 0) (- digit) digit))))
	  ((eq arg '-)
	   ;; Treat -0 as just -, so that -01 will work.
	   (setq prefix-arg (if (zerop digit) '- (- digit))))
	  (t
	   (setq prefix-arg digit)))))

;; For backward compatibility, minus with no modifiers is an ordinary
;; command if digits have already been entered.
(defun universal-argument-minus (arg)
  (interactive "P")
  (if (integerp arg)
      (universal-argument-other-key arg)
    (negative-argument arg)))

;; Anything else terminates the argument and is left in the queue to be
;; executed as a command.
(defun universal-argument-other-key (arg)
  (interactive "P")
  (setq prefix-arg arg)
  (setq unread-command-events (list last-input-event))
  (setq overriding-terminal-local-map nil))
1017

Jim Blandy's avatar
Jim Blandy committed
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
(defun forward-to-indentation (arg)
  "Move forward ARG lines and position at first nonblank character."
  (interactive "p")
  (forward-line arg)
  (skip-chars-forward " \t"))

(defun backward-to-indentation (arg)
  "Move backward ARG lines and position at first nonblank character."
  (interactive "p")
  (forward-line (- arg))
  (skip-chars-forward " \t"))

1030
(defvar kill-whole-line nil
1031
  "*If non-nil, `kill-line' with no arg at beg of line kills the whole line.")
1032

Jim Blandy's avatar
Jim Blandy committed
1033
(defun kill-line (&optional arg)
1034
  "Kill the rest of the current line; if no nonblanks there, kill thru newline.
Jim Blandy's avatar
Jim Blandy committed
1035 1036 1037 1038
With prefix argument, kill that many lines from point.
Negative arguments kill lines backward.

When calling from a program, nil means \"no arg\",
1039 1040 1041 1042
a number counts as a prefix arg.

If `kill-whole-line' is non-nil, then kill the whole line
when given no argument at the beginning of a line."
Jim Blandy's avatar
Jim Blandy committed
1043 1044
  (interactive "P")
  (kill-region (point)
1045 1046 1047 1048 1049 1050
	       ;; It is better to move point to the other end of the kill
	       ;; before killing.  That way, in a read-only buffer, point
	       ;; moves across the text that is copied to the kill ring.
	       ;; The choice has no effect on undo now that undo records
	       ;; the value of point from before the command was run.
	       (progn
Jim Blandy's avatar
Jim Blandy committed
1051 1052 1053 1054
		 (if arg
		     (forward-line (prefix-numeric-value arg))
		   (if (eobp)
		       (signal 'end-of-buffer nil))
1055
		   (if (or (looking-at "[ \t]*$") (and kill-whole-line (bolp)))
Jim Blandy's avatar
Jim Blandy committed
1056 1057 1058 1059
		       (forward-line 1)
		     (end-of-line)))
		 (point))))

Jim Blandy's avatar
Jim Blandy committed
1060 1061 1062 1063 1064 1065
;;;; Window system cut and paste hooks.

(defvar interprogram-cut-function nil
  "Function to call to make a killed region available to other programs.

Most window systems provide some sort of facility for cutting and
1066 1067 1068
pasting text between the windows of different programs.
This variable holds a function that Emacs calls whenever text
is put in the kill ring, to make the new kill available to other
Jim Blandy's avatar
Jim Blandy committed
1069 1070
programs.

1071 1072 1073 1074 1075
The function takes one or two arguments.
The first argument, TEXT, is a string containing
the text which should be made available.
The second, PUSH, if non-nil means this is a \"new\" kill;
nil means appending to an \"old\" kill.")
Jim Blandy's avatar
Jim Blandy committed
1076 1077 1078 1079 1080

(defvar interprogram-paste-function nil
  "Function to call to get text cut from other programs.

Most window systems provide some sort of facility for cutting and
1081 1082
pasting text between the windows of different programs.
This variable holds a function that Emacs calls to obtain
Jim Blandy's avatar
Jim Blandy committed
1083 1084 1085 1086 1087
text that other programs have provided for pasting.

The function should be called with no arguments.  If the function
returns nil, then no other program has provided such text, and the top
of the Emacs kill ring should be used.  If the function returns a
Jim Blandy's avatar
Jim Blandy committed
1088 1089 1090 1091 1092 1093 1094 1095
string, that string should be put in the kill ring as the latest kill.

Note that the function should return a string only if a program other
than Emacs has provided a string for pasting; if Emacs provided the
most recent string, the function should return nil.  If it is
difficult to tell whether Emacs or some other program provided the
current string, it is probably good enough to return nil if the string
is equal (according to `string=') to the last text Emacs provided.")
Jim Blandy's avatar
Jim Blandy committed
1096 1097 1098 1099



;;;; The kill ring data structure.
Jim Blandy's avatar
Jim Blandy committed
1100 1101

(defvar kill-ring nil
Jim Blandy's avatar
Jim Blandy committed
1102 1103 1104 1105 1106 1107 1108 1109
  "List of killed text sequences.
Since the kill ring is supposed to interact nicely with cut-and-paste
facilities offered by window systems, use of this variable should
interact nicely with `interprogram-cut-function' and
`interprogram-paste-function'.  The functions `kill-new',
`kill-append', and `current-kill' are supposed to implement this
interaction; you may want to use them instead of manipulating the kill
ring directly.")
Jim Blandy's avatar
Jim Blandy committed
1110 1111 1112 1113 1114 1115 1116

(defconst kill-ring-max 30
  "*Maximum length of kill ring before oldest elements are thrown away.")

(defvar kill-ring-yank-pointer nil
  "The tail of the kill ring whose car is the last thing yanked.")

1117
(defun kill-new (string &optional replace)
Jim Blandy's avatar
Jim Blandy committed
1118 1119
  "Make STRING the latest kill in the kill ring.
Set the kill-ring-yank pointer to point to it.
1120 1121 1122
If `interprogram-cut-function' is non-nil, apply it to STRING.
Optional second argument REPLACE non-nil means that STRING will replace
the front of the kill ring, rather than being added to the list."
1123 1124
  (and (fboundp 'menu-bar-update-yank-menu)
       (menu-bar-update-yank-menu string (and replace (car kill-ring))))
1125 1126 1127 1128 1129
  (if replace
      (setcar kill-ring string)
    (setq kill-ring (cons string kill-ring))
    (if (> (length kill-ring) kill-ring-max)
	(setcdr (nthcdr (1- kill-ring-max) kill-ring) nil)))
Jim Blandy's avatar
Jim Blandy committed
1130 1131
  (setq kill-ring-yank-pointer kill-ring)
  (if interprogram-cut-function
1132
      (funcall interprogram-cut-function string t)))
Jim Blandy's avatar
Jim Blandy committed
1133

Jim Blandy's avatar
Jim Blandy committed
1134