1 ;;; picture.el --- "Picture mode" -- editing using quarter-plane screen model.
3 ;; Copyright (C) 1985, 1994 Free Software Foundation, Inc.
5 ;; Author: K. Shane Hartman
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
27 ;; This code provides the picture-mode commands documented in the Emacs
28 ;; manual. The screen is treated as a semi-infinite quarter-plane with
29 ;; support for rectangle operations and `etch-a-sketch' character
30 ;; insertion in any of eight directions.
34 (defun move-to-column-force (column)
35 "Move to column COLUMN in current line.
36 Differs from `move-to-column' in that it creates or modifies whitespace
37 if necessary to attain exactly the specified column."
38 (or (natnump column
) (setq column
0))
39 (move-to-column column
)
40 (let ((col (current-column)))
43 (if (and (/= col column
)
44 (= (preceding-char) ?
\t))
45 (let (indent-tabs-mode)
48 (move-to-column column
))))
49 ;; This call will go away when Emacs gets real horizontal autoscrolling
50 (hscroll-point-visible)))
53 ;; Picture Movement Commands
55 (defun picture-beginning-of-line (&optional arg
)
56 "Position point at the beginning of the line.
57 With ARG not nil, move forward ARG - 1 lines first.
58 If scan reaches end of buffer, stop there without error."
60 (if arg
(forward-line (1- (prefix-numeric-value arg
))))
62 ;; This call will go away when Emacs gets real horizontal autoscrolling
63 (hscroll-point-visible))
65 (defun picture-end-of-line (&optional arg
)
66 "Position point after last non-blank character on current line.
67 With ARG not nil, move forward ARG - 1 lines first.
68 If scan reaches end of buffer, stop there without error."
70 (if arg
(forward-line (1- (prefix-numeric-value arg
))))
72 (skip-chars-backward " \t" (prog1 (point) (end-of-line)))
73 ;; This call will go away when Emacs gets real horizontal autoscrolling
74 (hscroll-point-visible))
76 (defun picture-forward-column (arg)
77 "Move cursor right, making whitespace if necessary.
78 With argument, move that many columns."
80 (let ((target-column (+ (current-column) arg
)))
81 (move-to-column-force target-column
)
82 ;; Picture mode isn't really suited to multi-column characters,
83 ;; but we might as well let the user move across them.
85 (> (current-column) target-column
)
88 (defun picture-backward-column (arg)
89 "Move cursor left, making whitespace if necessary.
90 With argument, move that many columns."
92 (picture-forward-column (- arg
)))
94 (defun picture-move-down (arg)
95 "Move vertically down, making whitespace if necessary.
96 With argument, move that many lines."
98 (let ((col (current-column)))
100 (move-to-column-force col
)))
102 (defconst picture-vertical-step
0
103 "Amount to move vertically after text character in Picture mode.")
105 (defconst picture-horizontal-step
1
106 "Amount to move horizontally after text character in Picture mode.")
108 (defun picture-move-up (arg)
109 "Move vertically up, making whitespace if necessary.
110 With argument, move that many lines."
112 (picture-move-down (- arg
)))
114 (defun picture-movement-right ()
115 "Move right after self-inserting character in Picture mode."
117 (picture-set-motion 0 1))
119 (defun picture-movement-left ()
120 "Move left after self-inserting character in Picture mode."
122 (picture-set-motion 0 -
1))
124 (defun picture-movement-up ()
125 "Move up after self-inserting character in Picture mode."
127 (picture-set-motion -
1 0))
129 (defun picture-movement-down ()
130 "Move down after self-inserting character in Picture mode."
132 (picture-set-motion 1 0))
134 (defun picture-movement-nw ()
135 "Move up and left after self-inserting character in Picture mode."
137 (picture-set-motion -
1 -
1))
139 (defun picture-movement-ne ()
140 "Move up and right after self-inserting character in Picture mode."
142 (picture-set-motion -
1 1))
144 (defun picture-movement-sw ()
145 "Move down and left after self-inserting character in Picture mode."
147 (picture-set-motion 1 -
1))
149 (defun picture-movement-se ()
150 "Move down and right after self-inserting character in Picture mode."
152 (picture-set-motion 1 1))
154 (defun picture-set-motion (vert horiz
)
155 "Set VERTICAL and HORIZONTAL increments for movement in Picture mode.
156 The mode line is updated to reflect the current direction."
157 (setq picture-vertical-step vert
158 picture-horizontal-step horiz
)
161 (car (nthcdr (+ 1 (% horiz
2) (* 3 (1+ (% vert
2))))
162 '(nw up ne left none right sw down se
)))))
163 (force-mode-line-update)
166 (defun picture-move ()
167 "Move in direction of `picture-vertical-step' and `picture-horizontal-step'."
168 (picture-move-down picture-vertical-step
)
169 (picture-forward-column picture-horizontal-step
))
171 (defun picture-motion (arg)
172 "Move point in direction of current picture motion in Picture mode.
173 With ARG do it that many times. Useful for delineating rectangles in
174 conjunction with diagonal picture motion.
175 Do \\[command-apropos] picture-movement to see commands which control motion."
177 (picture-move-down (* arg picture-vertical-step
))
178 (picture-forward-column (* arg picture-horizontal-step
)))
180 (defun picture-motion-reverse (arg)
181 "Move point in direction opposite of current picture motion in Picture mode.
182 With ARG do it that many times. Useful for delineating rectangles in
183 conjunction with diagonal picture motion.
184 Do \\[command-apropos] `picture-movement' to see commands which control motion."
186 (picture-motion (- arg
)))
189 ;; Picture insertion and deletion.
191 (defun picture-self-insert (arg)
192 "Insert this character in place of character previously at the cursor.
193 The cursor then moves in the direction you previously specified
194 with the commands `picture-movement-right', `picture-movement-up', etc.
195 Do \\[command-apropos] `picture-movement' to see those commands."
199 (move-to-column-force (1+ (current-column)))
201 (insert last-command-event
) ; Always a character in this case.
205 (defun picture-clear-column (arg)
206 "Clear out ARG columns after point without moving."
208 (let* ((opoint (point))
209 (original-col (current-column))
210 (target-col (+ original-col arg
)))
211 (move-to-column-force target-col
)
212 (delete-region opoint
(point))
214 (indent-to (max target-col original-col
)))))
216 (defun picture-backward-clear-column (arg)
217 "Clear out ARG columns before point, moving back over them."
219 (picture-clear-column (- arg
)))
221 (defun picture-clear-line (arg)
222 "Clear out rest of line; if at end of line, advance to next line.
223 Cleared-out line text goes into the kill ring, as do newlines that are
224 advanced over. With argument, clear out (and save in kill ring) that
229 (setq arg
(prefix-numeric-value arg
))
231 (newline (if (> arg
0) arg
(- arg
))))
232 (if (looking-at "[ \t]*$")
233 (kill-ring-save (point) (progn (forward-line 1) (point)))
234 (kill-region (point) (progn (end-of-line) (point))))))
236 (defun picture-newline (arg)
237 "Move to the beginning of the following line.
238 With argument, moves that many lines (up, if negative argument);
239 always moves to the beginning of a line."
245 (if (eobp) (newline) (forward-char 1))
246 (setq arg
(1- arg
))))
247 ;; This call will go away when Emacs gets real horizontal autoscrolling
248 (hscroll-point-visible))
250 (defun picture-open-line (arg)
251 "Insert an empty line after the current line.
252 With positive argument insert that many lines."
257 ;; This call will go away when Emacs gets real horizontal autoscrolling
258 (hscroll-point-visible))
260 (defun picture-duplicate-line ()
261 "Insert a duplicate of the current line, below it."
266 (progn (beginning-of-line) (point))
267 (progn (picture-newline 1) (point)))))
271 ;; Like replace-match, but overwrites.
272 (defun picture-replace-match (newtext fixedcase literal
)
273 (let (ocolumn change pos
)
274 (goto-char (setq pos
(match-end 0)))
275 (setq ocolumn
(current-column))
276 ;; Make the replacement and undo it, to see how it changes the length.
277 (let ((buffer-undo-list nil
)
279 (replace-match newtext fixedcase literal
)
280 (setq change
(- (current-column) ocolumn
))
281 (setq list1 buffer-undo-list
)
283 (setq list1
(primitive-undo 1 list1
))))
286 (delete-region (point)
288 (move-to-column-force (+ change
(current-column)))
290 (replace-match newtext fixedcase literal
)
292 (insert-char ?\
(- change
)))))
296 (defvar picture-tab-chars
"!-~"
297 "*A character set which controls behavior of commands
298 \\[picture-set-tab-stops] and \\[picture-tab-search]. It is NOT a
299 regular expression, any regexp special characters will be quoted.
300 It defines a set of \"interesting characters\" to look for when setting
301 \(or searching for) tab stops, initially \"!-~\" (all printing characters).
302 For example, suppose that you are editing a table which is formatted thus:
303 | foo | bar + baz | 23 *
304 | bubbles | and + etc | 97 *
305 and that `picture-tab-chars' is \"|+*\". Then invoking
306 \\[picture-set-tab-stops] on either of the previous lines would result
307 in the following tab stops
309 Another example - \"A-Za-z0-9\" would produce the tab stops
312 Note that if you want the character `-' to be in the set, it must be
313 included in a range or else appear in a context where it cannot be
314 taken for indicating a range (e.g. \"-A-Z\" declares the set to be the
315 letters `A' through `Z' and the character `-'). If you want the
316 character `\\' in the set it must be preceded by itself: \"\\\\\".
318 The command \\[picture-tab-search] is defined to move beneath (or to) a
319 character belonging to this set independent of the tab stops list.")
321 (defun picture-set-tab-stops (&optional arg
)
322 "Set value of `tab-stop-list' according to context of this line.
323 This controls the behavior of \\[picture-tab]. A tab stop is set at
324 every column occupied by an \"interesting character\" that is preceded
325 by whitespace. Interesting characters are defined by the variable
326 `picture-tab-chars', see its documentation for an example of usage.
327 With ARG, just (re)set `tab-stop-list' to its default value. The tab
328 stops computed are displayed in the minibuffer with `:' at each stop."
333 (setq tabs
(default-value 'tab-stop-list
))
334 (let ((regexp (concat "[ \t]+[" (regexp-quote picture-tab-chars
) "]")))
338 (while (re-search-backward regexp bol t
)
339 (skip-chars-forward " \t")
340 (setq tabs
(cons (current-column) tabs
)))
342 (error "No characters in set %s on this line."
343 (regexp-quote picture-tab-chars
))))))
344 (setq tab-stop-list tabs
)
345 (let ((blurb (make-string (1+ (nth (1- (length tabs
)) tabs
)) ?\
)))
347 (aset blurb
(car tabs
) ?
:)
348 (setq tabs
(cdr tabs
)))
351 (defun picture-tab-search (&optional arg
)
352 "Move to column beneath next interesting char in previous line.
353 With ARG move to column occupied by next interesting character in this
354 line. The character must be preceded by whitespace.
355 \"interesting characters\" are defined by variable `picture-tab-chars'.
356 If no such character is found, move to beginning of line."
358 (let ((target (current-column)))
364 (concat "^" (regexp-quote picture-tab-chars
))
367 (move-to-column target
))
368 (if (re-search-forward
369 (concat "[ \t]+[" (regexp-quote picture-tab-chars
) "]")
370 (save-excursion (end-of-line) (point))
372 (setq target
(1- (current-column)))
375 (move-to-column-force target
)
376 (beginning-of-line))))
378 (defun picture-tab (&optional arg
)
379 "Tab transparently (just move point) to next tab stop.
380 With prefix arg, overwrite the traversed text with spaces. The tab stop
381 list can be changed by \\[picture-set-tab-stops] and \\[edit-tab-stops].
382 See also documentation for variable `picture-tab-chars'."
384 (let* ((opoint (point)))
387 (let (indent-tabs-mode
388 (column (current-column)))
389 (delete-region opoint
(point))
390 (indent-to column
)))))
392 ;; Picture Rectangles
394 (defconst picture-killed-rectangle nil
395 "Rectangle killed or copied by \\[picture-clear-rectangle] in Picture mode.
396 The contents can be retrieved by \\[picture-yank-rectangle]")
398 (defun picture-clear-rectangle (start end
&optional killp
)
399 "Clear and save rectangle delineated by point and mark.
400 The rectangle is saved for yanking by \\[picture-yank-rectangle] and replaced
401 with whitespace. The previously saved rectangle, if any, is lost. With
402 prefix argument, the rectangle is actually killed, shifting remaining text."
404 (setq picture-killed-rectangle
(picture-snarf-rectangle start end killp
)))
406 (defun picture-clear-rectangle-to-register (start end register
&optional killp
)
407 "Clear rectangle delineated by point and mark into REGISTER.
408 The rectangle is saved in REGISTER and replaced with whitespace. With
409 prefix argument, the rectangle is actually killed, shifting remaining text."
410 (interactive "r\ncRectangle to register: \nP")
411 (set-register register
(picture-snarf-rectangle start end killp
)))
413 (defun picture-snarf-rectangle (start end
&optional killp
)
414 (let ((column (current-column))
415 (indent-tabs-mode nil
))
416 (prog1 (save-excursion
418 (delete-extract-rectangle start end
)
419 (prog1 (extract-rectangle start end
)
420 (clear-rectangle start end
))))
421 (move-to-column-force column
))))
423 (defun picture-yank-rectangle (&optional insertp
)
424 "Overlay rectangle saved by \\[picture-clear-rectangle]
425 The rectangle is positioned with upper left corner at point, overwriting
426 existing text. With prefix argument, the rectangle is inserted instead,
427 shifting existing text. Leaves mark at one corner of rectangle and
428 point at the other (diagonally opposed) corner."
430 (if (not (consp picture-killed-rectangle
))
431 (error "No rectangle saved.")
432 (picture-insert-rectangle picture-killed-rectangle insertp
)))
434 (defun picture-yank-at-click (click arg
)
435 "Insert the last killed rectangle at the position clicked on.
436 Also move point to one end of the text thus inserted (normally the end).
437 Prefix arguments are interpreted as with \\[yank].
438 If `mouse-yank-at-point' is non-nil, insert at point
439 regardless of where you click."
441 (or mouse-yank-at-point
(mouse-set-point click
))
442 (picture-yank-rectangle arg
))
444 (defun picture-yank-rectangle-from-register (register &optional insertp
)
445 "Overlay rectangle saved in REGISTER.
446 The rectangle is positioned with upper left corner at point, overwriting
447 existing text. With prefix argument, the rectangle is
448 inserted instead, shifting existing text. Leaves mark at one corner
449 of rectangle and point at the other (diagonally opposed) corner."
450 (interactive "cRectangle from register: \nP")
451 (let ((rectangle (get-register register
)))
452 (if (not (consp rectangle
))
453 (error "Register %c does not contain a rectangle." register
)
454 (picture-insert-rectangle rectangle insertp
))))
456 (defun picture-insert-rectangle (rectangle &optional insertp
)
457 "Overlay RECTANGLE with upper left corner at point.
458 Optional argument INSERTP, if non-nil causes RECTANGLE to be inserted.
459 Leaves the region surrounding the rectangle."
460 (let ((indent-tabs-mode nil
))
463 (delete-rectangle (point)
465 (picture-forward-column (length (car rectangle
)))
466 (picture-move-down (1- (length rectangle
)))
469 (insert-rectangle rectangle
)))
472 ;; Picture Keymap, entry and exit points.
474 (defconst picture-mode-map nil
)
476 (defun picture-substitute (oldfun newfun
)
477 (substitute-key-definition oldfun newfun picture-mode-map global-map
))
479 (if (not picture-mode-map
)
481 (setq picture-mode-map
(list 'keymap
(make-vector 256 nil
)))
482 (picture-substitute 'self-insert-command
'picture-self-insert
)
483 (picture-substitute 'completion-separator-self-insert-command
484 'picture-self-insert
)
485 (picture-substitute 'completion-separator-self-insert-autofilling
486 'picture-self-insert
)
487 (picture-substitute 'forward-char
'picture-forward-column
)
488 (picture-substitute 'backward-char
'picture-backward-column
)
489 (picture-substitute 'delete-char
'picture-clear-column
)
490 ;; There are two possibilities for what is normally on DEL.
491 (picture-substitute 'backward-delete-char-untabify
'picture-backward-clear-column
)
492 (picture-substitute 'delete-backward-char
'picture-backward-clear-column
)
493 (picture-substitute 'kill-line
'picture-clear-line
)
494 (picture-substitute 'open-line
'picture-open-line
)
495 (picture-substitute 'newline
'picture-newline
)
496 (picture-substitute 'newline-and-indent
'picture-duplicate-line
)
497 (picture-substitute 'next-line
'picture-move-down
)
498 (picture-substitute 'previous-line
'picture-move-up
)
499 (picture-substitute 'beginning-of-line
'picture-beginning-of-line
)
500 (picture-substitute 'end-of-line
'picture-end-of-line
)
502 (define-key picture-mode-map
"\C-c\C-d" 'delete-char
)
503 (define-key picture-mode-map
"\e\t" 'picture-toggle-tab-state
)
504 (define-key picture-mode-map
"\t" 'picture-tab
)
505 (define-key picture-mode-map
"\e\t" 'picture-tab-search
)
506 (define-key picture-mode-map
"\C-c\t" 'picture-set-tab-stops
)
507 (define-key picture-mode-map
"\C-c\C-k" 'picture-clear-rectangle
)
508 (define-key picture-mode-map
"\C-c\C-w" 'picture-clear-rectangle-to-register
)
509 (define-key picture-mode-map
"\C-c\C-y" 'picture-yank-rectangle
)
510 (define-key picture-mode-map
"\C-c\C-x" 'picture-yank-rectangle-from-register
)
511 (define-key picture-mode-map
"\C-c\C-c" 'picture-mode-exit
)
512 (define-key picture-mode-map
"\C-c\C-f" 'picture-motion
)
513 (define-key picture-mode-map
"\C-c\C-b" 'picture-motion-reverse
)
514 (define-key picture-mode-map
"\C-c<" 'picture-movement-left
)
515 (define-key picture-mode-map
"\C-c>" 'picture-movement-right
)
516 (define-key picture-mode-map
"\C-c^" 'picture-movement-up
)
517 (define-key picture-mode-map
"\C-c." 'picture-movement-down
)
518 (define-key picture-mode-map
"\C-c`" 'picture-movement-nw
)
519 (define-key picture-mode-map
"\C-c'" 'picture-movement-ne
)
520 (define-key picture-mode-map
"\C-c/" 'picture-movement-sw
)
521 (define-key picture-mode-map
"\C-c\\" 'picture-movement-se
)))
523 (defvar picture-mode-hook nil
524 "If non-nil, its value is called on entry to Picture mode.
525 Picture mode is invoked by the command \\[picture-mode].")
527 (defvar picture-mode-old-local-map
)
528 (defvar picture-mode-old-mode-name
)
529 (defvar picture-mode-old-major-mode
)
530 (defvar picture-mode-old-truncate-lines
)
533 (defun picture-mode ()
534 "Switch to Picture mode, in which a quarter-plane screen model is used.
535 Printing characters replace instead of inserting themselves with motion
536 afterwards settable by these commands:
537 C-c < Move left after insertion.
538 C-c > Move right after insertion.
539 C-c ^ Move up after insertion.
540 C-c . Move down after insertion.
541 C-c ` Move northwest (nw) after insertion.
542 C-c ' Move northeast (ne) after insertion.
543 C-c / Move southwest (sw) after insertion.
544 C-c \\ Move southeast (se) after insertion.
545 The current direction is displayed in the mode line. The initial
546 direction is right. Whitespace is inserted and tabs are changed to
547 spaces when required by movement. You can move around in the buffer
549 \\[picture-move-down] Move vertically to SAME column in previous line.
550 \\[picture-move-up] Move vertically to SAME column in next line.
551 \\[picture-end-of-line] Move to column following last non-whitespace character.
552 \\[picture-forward-column] Move right inserting spaces if required.
553 \\[picture-backward-column] Move left changing tabs to spaces if required.
554 C-c C-f Move in direction of current picture motion.
555 C-c C-b Move in opposite direction of current picture motion.
556 Return Move to beginning of next line.
557 You can edit tabular text with these commands:
558 M-Tab Move to column beneath (or at) next interesting character.
559 `Indents' relative to a previous line.
560 Tab Move to next stop in tab stop list.
561 C-c Tab Set tab stops according to context of this line.
562 With ARG resets tab stops to default (global) value.
563 See also documentation of variable picture-tab-chars
564 which defines \"interesting character\". You can manually
565 change the tab stop list with command \\[edit-tab-stops].
566 You can manipulate text with these commands:
567 C-d Clear (replace) ARG columns after point without moving.
568 C-c C-d Delete char at point - the command normally assigned to C-d.
569 \\[picture-backward-clear-column] Clear (replace) ARG columns before point, moving back over them.
570 \\[picture-clear-line] Clear ARG lines, advancing over them. The cleared
571 text is saved in the kill ring.
572 \\[picture-open-line] Open blank line(s) beneath current line.
573 You can manipulate rectangles with these commands:
574 C-c C-k Clear (or kill) a rectangle and save it.
575 C-c C-w Like C-c C-k except rectangle is saved in named register.
576 C-c C-y Overlay (or insert) currently saved rectangle at point.
577 C-c C-x Like C-c C-y except rectangle is taken from named register.
578 \\[copy-rectangle-to-register] Copies a rectangle to a register.
579 \\[advertised-undo] Can undo effects of rectangle overlay commands
580 commands if invoked soon enough.
581 You can return to the previous mode with:
582 C-c C-c Which also strips trailing whitespace from every line.
583 Stripping is suppressed by supplying an argument.
585 Entry to this mode calls the value of picture-mode-hook if non-nil.
587 Note that Picture mode commands will work outside of Picture mode, but
588 they are not defaultly assigned to keys."
590 (if (eq major-mode
'picture-mode
)
591 (error "You are already editing a picture.")
592 (make-local-variable 'picture-mode-old-local-map
)
593 (setq picture-mode-old-local-map
(current-local-map))
594 (use-local-map picture-mode-map
)
595 (make-local-variable 'picture-mode-old-mode-name
)
596 (setq picture-mode-old-mode-name mode-name
)
597 (make-local-variable 'picture-mode-old-major-mode
)
598 (setq picture-mode-old-major-mode major-mode
)
599 (setq major-mode
'picture-mode
)
600 (make-local-variable 'picture-killed-rectangle
)
601 (setq picture-killed-rectangle nil
)
602 (make-local-variable 'tab-stop-list
)
603 (setq tab-stop-list
(default-value 'tab-stop-list
))
604 (make-local-variable 'picture-tab-chars
)
605 (setq picture-tab-chars
(default-value 'picture-tab-chars
))
606 (make-local-variable 'picture-vertical-step
)
607 (make-local-variable 'picture-horizontal-step
)
608 (make-local-variable 'picture-mode-old-truncate-lines
)
609 (setq picture-mode-old-truncate-lines truncate-lines
)
610 (setq truncate-lines t
)
611 (picture-set-motion 0 1)
613 ;; edit-picture-hook is what we used to run, picture-mode-hook is in doc.
614 (run-hooks 'edit-picture-hook
'picture-mode-hook
)
615 (message "Type %s in this buffer to return it to %s mode."
616 (substitute-command-keys "\\[picture-mode-exit]")
617 picture-mode-old-mode-name
)))
620 (defalias 'edit-picture
'picture-mode
)
622 (defun picture-mode-exit (&optional nostrip
)
623 "Undo picture-mode and return to previous major mode.
624 With no argument strips whitespace from end of every line in Picture buffer
625 otherwise just return to previous mode."
627 (if (not (eq major-mode
'picture-mode
))
628 (error "You aren't editing a Picture.")
629 (if (not nostrip
) (picture-clean))
630 (setq mode-name picture-mode-old-mode-name
)
631 (use-local-map picture-mode-old-local-map
)
632 (setq major-mode picture-mode-old-major-mode
)
633 (kill-local-variable 'tab-stop-list
)
634 (setq truncate-lines picture-mode-old-truncate-lines
)
635 (force-mode-line-update)))
637 (defun picture-clean ()
638 "Eliminate whitespace at ends of lines."
640 (goto-char (point-min))
641 (while (re-search-forward "[ \t][ \t]*$" nil t
)
642 (delete-region (match-beginning 0) (point)))))
646 ;;; picture.el ends here