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1 | ;;; picture.el --- "Picture mode" -- editing using quarter-plane screen model. |
2 | ||
3a801d0c ER |
3 | ;; Copyright (C) 1985 Free Software Foundation, Inc. |
4 | ||
e5167999 ER |
5 | ;; Author: K. Shane Hartman |
6 | ;; Maintainer: FSF | |
695d13c7 BP |
7 | |
8 | ;; This file is part of GNU Emacs. | |
9 | ||
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 | |
e5167999 | 12 | ;; the Free Software Foundation; either version 2, or (at your option) |
695d13c7 BP |
13 | ;; any later version. |
14 | ||
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. | |
19 | ||
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 | |
22 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | ||
e5167999 | 24 | ;;; Code: |
695d13c7 | 25 | |
695d13c7 BP |
26 | (defun move-to-column-force (column) |
27 | "Move to column COLUMN in current line. | |
28 | Differs from `move-to-column' in that it creates or modifies whitespace | |
29 | if necessary to attain exactly the specified column." | |
30 | (move-to-column column) | |
31 | (let ((col (current-column))) | |
32 | (if (< col column) | |
33 | (indent-to column) | |
34 | (if (and (/= col column) | |
35 | (= (preceding-char) ?\t)) | |
36 | (let (indent-tabs-mode) | |
37 | (delete-char -1) | |
38 | (indent-to col) | |
39 | (move-to-column column)))))) | |
40 | ||
41 | \f | |
42 | ;; Picture Movement Commands | |
43 | ||
44 | (defun picture-end-of-line (&optional arg) | |
45 | "Position point after last non-blank character on current line. | |
46 | With ARG not nil, move forward ARG - 1 lines first. | |
47 | If scan reaches end of buffer, stop there without error." | |
48 | (interactive "P") | |
49 | (if arg (forward-line (1- (prefix-numeric-value arg)))) | |
50 | (beginning-of-line) | |
51 | (skip-chars-backward " \t" (prog1 (point) (end-of-line)))) | |
52 | ||
53 | (defun picture-forward-column (arg) | |
54 | "Move cursor right, making whitespace if necessary. | |
55 | With argument, move that many columns." | |
56 | (interactive "p") | |
57 | (move-to-column-force (+ (current-column) arg))) | |
58 | ||
59 | (defun picture-backward-column (arg) | |
60 | "Move cursor left, making whitespace if necessary. | |
61 | With argument, move that many columns." | |
62 | (interactive "p") | |
63 | (move-to-column-force (- (current-column) arg))) | |
64 | ||
65 | (defun picture-move-down (arg) | |
66 | "Move vertically down, making whitespace if necessary. | |
67 | With argument, move that many lines." | |
68 | (interactive "p") | |
69 | (let ((col (current-column))) | |
70 | (picture-newline arg) | |
71 | (move-to-column-force col))) | |
72 | ||
73 | (defconst picture-vertical-step 0 | |
74 | "Amount to move vertically after text character in Picture mode.") | |
75 | ||
76 | (defconst picture-horizontal-step 1 | |
77 | "Amount to move horizontally after text character in Picture mode.") | |
78 | ||
79 | (defun picture-move-up (arg) | |
80 | "Move vertically up, making whitespace if necessary. | |
81 | With argument, move that many lines." | |
82 | (interactive "p") | |
83 | (picture-move-down (- arg))) | |
84 | ||
85 | (defun picture-movement-right () | |
86 | "Move right after self-inserting character in Picture mode." | |
87 | (interactive) | |
88 | (picture-set-motion 0 1)) | |
89 | ||
90 | (defun picture-movement-left () | |
91 | "Move left after self-inserting character in Picture mode." | |
92 | (interactive) | |
93 | (picture-set-motion 0 -1)) | |
94 | ||
95 | (defun picture-movement-up () | |
96 | "Move up after self-inserting character in Picture mode." | |
97 | (interactive) | |
98 | (picture-set-motion -1 0)) | |
99 | ||
100 | (defun picture-movement-down () | |
101 | "Move down after self-inserting character in Picture mode." | |
102 | (interactive) | |
103 | (picture-set-motion 1 0)) | |
104 | ||
105 | (defun picture-movement-nw () | |
106 | "Move up and left after self-inserting character in Picture mode." | |
107 | (interactive) | |
108 | (picture-set-motion -1 -1)) | |
109 | ||
110 | (defun picture-movement-ne () | |
111 | "Move up and right after self-inserting character in Picture mode." | |
112 | (interactive) | |
113 | (picture-set-motion -1 1)) | |
114 | ||
115 | (defun picture-movement-sw () | |
116 | "Move down and left after self-inserting character in Picture mode." | |
117 | (interactive) | |
118 | (picture-set-motion 1 -1)) | |
119 | ||
120 | (defun picture-movement-se () | |
121 | "Move down and right after self-inserting character in Picture mode." | |
122 | (interactive) | |
123 | (picture-set-motion 1 1)) | |
124 | ||
125 | (defun picture-set-motion (vert horiz) | |
126 | "Set VERTICAL and HORIZONTAL increments for movement in Picture mode. | |
127 | The mode line is updated to reflect the current direction." | |
128 | (setq picture-vertical-step vert | |
129 | picture-horizontal-step horiz) | |
130 | (setq mode-name | |
131 | (format "Picture:%s" | |
132 | (car (nthcdr (+ 1 (% horiz 2) (* 3 (1+ (% vert 2)))) | |
133 | '(nw up ne left none right sw down se))))) | |
134 | ;; Kludge - force the mode line to be updated. Is there a better | |
135 | ;; way to this? | |
136 | (set-buffer-modified-p (buffer-modified-p)) | |
137 | (message "")) | |
138 | ||
139 | (defun picture-move () | |
140 | "Move in direction of `picture-vertical-step' and `picture-horizontal-step'." | |
141 | (picture-move-down picture-vertical-step) | |
142 | (picture-forward-column picture-horizontal-step)) | |
143 | ||
144 | (defun picture-motion (arg) | |
145 | "Move point in direction of current picture motion in Picture mode. | |
146 | With ARG do it that many times. Useful for delineating rectangles in | |
147 | conjunction with diagonal picture motion. | |
148 | Do \\[command-apropos] picture-movement to see commands which control motion." | |
149 | (interactive "p") | |
150 | (picture-move-down (* arg picture-vertical-step)) | |
151 | (picture-forward-column (* arg picture-horizontal-step))) | |
152 | ||
153 | (defun picture-motion-reverse (arg) | |
154 | "Move point in direction opposite of current picture motion in Picture mode. | |
155 | With ARG do it that many times. Useful for delineating rectangles in | |
156 | conjunction with diagonal picture motion. | |
157 | Do \\[command-apropos] `picture-movement' to see commands which control motion." | |
158 | (interactive "p") | |
159 | (picture-motion (- arg))) | |
160 | ||
161 | \f | |
162 | ;; Picture insertion and deletion. | |
163 | ||
164 | (defun picture-self-insert (arg) | |
165 | "Insert this character in place of character previously at the cursor. | |
166 | The cursor then moves in the direction you previously specified | |
167 | with the commands `picture-movement-right', `picture-movement-up', etc. | |
168 | Do \\[command-apropos] `picture-movement' to see those commands." | |
169 | (interactive "p") | |
170 | (while (> arg 0) | |
171 | (setq arg (1- arg)) | |
172 | (move-to-column-force (1+ (current-column))) | |
173 | (delete-char -1) | |
174 | (insert last-input-char) | |
175 | (forward-char -1) | |
176 | (picture-move))) | |
177 | ||
178 | (defun picture-clear-column (arg) | |
179 | "Clear out ARG columns after point without moving." | |
180 | (interactive "p") | |
181 | (let* ((opoint (point)) | |
182 | (original-col (current-column)) | |
183 | (target-col (+ original-col arg))) | |
184 | (move-to-column-force target-col) | |
185 | (delete-region opoint (point)) | |
186 | (save-excursion | |
187 | (indent-to (max target-col original-col))))) | |
188 | ||
189 | (defun picture-backward-clear-column (arg) | |
190 | "Clear out ARG columns before point, moving back over them." | |
191 | (interactive "p") | |
192 | (picture-clear-column (- arg))) | |
193 | ||
194 | (defun picture-clear-line (arg) | |
195 | "Clear out rest of line; if at end of line, advance to next line. | |
196 | Cleared-out line text goes into the kill ring, as do newlines that are | |
197 | advanced over. With argument, clear out (and save in kill ring) that | |
198 | many lines." | |
199 | (interactive "P") | |
200 | (if arg | |
201 | (progn | |
202 | (setq arg (prefix-numeric-value arg)) | |
203 | (kill-line arg) | |
204 | (newline (if (> arg 0) arg (- arg)))) | |
205 | (if (looking-at "[ \t]*$") | |
206 | (kill-ring-save (point) (progn (forward-line 1) (point))) | |
207 | (kill-region (point) (progn (end-of-line) (point)))))) | |
208 | ||
209 | (defun picture-newline (arg) | |
210 | "Move to the beginning of the following line. | |
211 | With argument, moves that many lines (up, if negative argument); | |
212 | always moves to the beginning of a line." | |
213 | (interactive "p") | |
214 | (if (< arg 0) | |
215 | (forward-line arg) | |
216 | (while (> arg 0) | |
217 | (end-of-line) | |
218 | (if (eobp) (newline) (forward-char 1)) | |
219 | (setq arg (1- arg))))) | |
220 | ||
221 | (defun picture-open-line (arg) | |
222 | "Insert an empty line after the current line. | |
223 | With positive argument insert that many lines." | |
224 | (interactive "p") | |
225 | (save-excursion | |
226 | (end-of-line) | |
227 | (open-line arg))) | |
228 | ||
229 | (defun picture-duplicate-line () | |
230 | "Insert a duplicate of the current line, below it." | |
231 | (interactive) | |
232 | (save-excursion | |
233 | (let ((contents | |
234 | (buffer-substring | |
235 | (progn (beginning-of-line) (point)) | |
236 | (progn (picture-newline 1) (point))))) | |
237 | (forward-line -1) | |
238 | (insert contents)))) | |
239 | ||
240 | \f | |
241 | ;; Picture Tabs | |
242 | ||
243 | (defvar picture-tab-chars "!-~" | |
244 | "*A character set which controls behavior of commands | |
245 | \\[picture-set-tab-stops] and \\[picture-tab-search]. It is NOT a | |
246 | regular expression, any regexp special characters will be quoted. | |
247 | It defines a set of \"interesting characters\" to look for when setting | |
248 | \(or searching for) tab stops, initially \"!-~\" (all printing characters). | |
249 | For example, suppose that you are editing a table which is formatted thus: | |
250 | | foo | bar + baz | 23 * | |
251 | | bubbles | and + etc | 97 * | |
252 | and that `picture-tab-chars' is \"|+*\". Then invoking | |
253 | \\[picture-set-tab-stops] on either of the previous lines would result | |
254 | in the following tab stops | |
255 | : : : : | |
256 | Another example - \"A-Za-z0-9\" would produce the tab stops | |
257 | : : : : | |
258 | ||
259 | Note that if you want the character `-' to be in the set, it must be | |
260 | included in a range or else appear in a context where it cannot be | |
261 | taken for indicating a range (e.g. \"-A-Z\" declares the set to be the | |
262 | letters `A' through `Z' and the character `-'). If you want the | |
263 | character `\\' in the set it must be preceded by itself: \"\\\\\". | |
264 | ||
265 | The command \\[picture-tab-search] is defined to move beneath (or to) a | |
266 | character belonging to this set independent of the tab stops list.") | |
267 | ||
268 | (defun picture-set-tab-stops (&optional arg) | |
269 | "Set value of `tab-stop-list' according to context of this line. | |
270 | This controls the behavior of \\[picture-tab]. A tab stop is set at | |
271 | every column occupied by an \"interesting character\" that is preceded | |
272 | by whitespace. Interesting characters are defined by the variable | |
273 | `picture-tab-chars', see its documentation for an example of usage. | |
274 | With ARG, just (re)set `tab-stop-list' to its default value. The tab | |
275 | stops computed are displayed in the minibuffer with `:' at each stop." | |
276 | (interactive "P") | |
277 | (save-excursion | |
278 | (let (tabs) | |
279 | (if arg | |
280 | (setq tabs (default-value 'tab-stop-list)) | |
281 | (let ((regexp (concat "[ \t]+[" (regexp-quote picture-tab-chars) "]"))) | |
282 | (beginning-of-line) | |
283 | (let ((bol (point))) | |
284 | (end-of-line) | |
285 | (while (re-search-backward regexp bol t) | |
286 | (skip-chars-forward " \t") | |
287 | (setq tabs (cons (current-column) tabs))) | |
288 | (if (null tabs) | |
289 | (error "No characters in set %s on this line." | |
290 | (regexp-quote picture-tab-chars)))))) | |
291 | (setq tab-stop-list tabs) | |
292 | (let ((blurb (make-string (1+ (nth (1- (length tabs)) tabs)) ?\ ))) | |
293 | (while tabs | |
294 | (aset blurb (car tabs) ?:) | |
295 | (setq tabs (cdr tabs))) | |
296 | (message blurb))))) | |
297 | ||
298 | (defun picture-tab-search (&optional arg) | |
299 | "Move to column beneath next interesting char in previous line. | |
300 | With ARG move to column occupied by next interesting character in this | |
301 | line. The character must be preceded by whitespace. | |
302 | \"interesting characters\" are defined by variable `picture-tab-chars'. | |
303 | If no such character is found, move to beginning of line." | |
304 | (interactive "P") | |
305 | (let ((target (current-column))) | |
306 | (save-excursion | |
307 | (if (and (not arg) | |
308 | (progn | |
309 | (beginning-of-line) | |
310 | (skip-chars-backward | |
311 | (concat "^" (regexp-quote picture-tab-chars)) | |
312 | (point-min)) | |
313 | (not (bobp)))) | |
314 | (move-to-column target)) | |
315 | (if (re-search-forward | |
316 | (concat "[ \t]+[" (regexp-quote picture-tab-chars) "]") | |
317 | (save-excursion (end-of-line) (point)) | |
318 | 'move) | |
319 | (setq target (1- (current-column))) | |
320 | (setq target nil))) | |
321 | (if target | |
322 | (move-to-column-force target) | |
323 | (beginning-of-line)))) | |
324 | ||
325 | (defun picture-tab (&optional arg) | |
326 | "Tab transparently (just move point) to next tab stop. | |
327 | With prefix arg, overwrite the traversed text with spaces. The tab stop | |
328 | list can be changed by \\[picture-set-tab-stops] and \\[edit-tab-stops]. | |
329 | See also documentation for variable `picture-tab-chars'." | |
330 | (interactive "P") | |
331 | (let* ((opoint (point))) | |
332 | (move-to-tab-stop) | |
333 | (if arg | |
334 | (let (indent-tabs-mode | |
335 | (column (current-column))) | |
336 | (delete-region opoint (point)) | |
337 | (indent-to column))))) | |
338 | \f | |
339 | ;; Picture Rectangles | |
340 | ||
341 | (defconst picture-killed-rectangle nil | |
342 | "Rectangle killed or copied by \\[picture-clear-rectangle] in Picture mode. | |
343 | The contents can be retrieved by \\[picture-yank-rectangle]") | |
344 | ||
345 | (defun picture-clear-rectangle (start end &optional killp) | |
346 | "Clear and save rectangle delineated by point and mark. | |
347 | The rectangle is saved for yanking by \\[picture-yank-rectangle] and replaced | |
348 | with whitespace. The previously saved rectangle, if any, is lost. With | |
349 | prefix argument, the rectangle is actually killed, shifting remaining text." | |
350 | (interactive "r\nP") | |
351 | (setq picture-killed-rectangle (picture-snarf-rectangle start end killp))) | |
352 | ||
353 | (defun picture-clear-rectangle-to-register (start end register &optional killp) | |
354 | "Clear rectangle delineated by point and mark into REGISTER. | |
355 | The rectangle is saved in REGISTER and replaced with whitespace. With | |
356 | prefix argument, the rectangle is actually killed, shifting remaining text." | |
357 | (interactive "r\ncRectangle to register: \nP") | |
358 | (set-register register (picture-snarf-rectangle start end killp))) | |
359 | ||
360 | (defun picture-snarf-rectangle (start end &optional killp) | |
361 | (let ((column (current-column)) | |
362 | (indent-tabs-mode nil)) | |
363 | (prog1 (save-excursion | |
364 | (if killp | |
365 | (delete-extract-rectangle start end) | |
366 | (prog1 (extract-rectangle start end) | |
367 | (clear-rectangle start end)))) | |
368 | (move-to-column-force column)))) | |
369 | ||
370 | (defun picture-yank-rectangle (&optional insertp) | |
371 | "Overlay rectangle saved by \\[picture-clear-rectangle] | |
372 | The rectangle is positioned with upper left corner at point, overwriting | |
373 | existing text. With prefix argument, the rectangle is inserted instead, | |
374 | shifting existing text. Leaves mark at one corner of rectangle and | |
375 | point at the other (diagonally opposed) corner." | |
376 | (interactive "P") | |
377 | (if (not (consp picture-killed-rectangle)) | |
378 | (error "No rectangle saved.") | |
379 | (picture-insert-rectangle picture-killed-rectangle insertp))) | |
380 | ||
381 | (defun picture-yank-rectangle-from-register (register &optional insertp) | |
382 | "Overlay rectangle saved in REGISTER. | |
383 | The rectangle is positioned with upper left corner at point, overwriting | |
384 | existing text. With prefix argument, the rectangle is | |
385 | inserted instead, shifting existing text. Leaves mark at one corner | |
386 | of rectangle and point at the other (diagonally opposed) corner." | |
387 | (interactive "cRectangle from register: \nP") | |
388 | (let ((rectangle (get-register register))) | |
389 | (if (not (consp rectangle)) | |
390 | (error "Register %c does not contain a rectangle." register) | |
391 | (picture-insert-rectangle rectangle insertp)))) | |
392 | ||
393 | (defun picture-insert-rectangle (rectangle &optional insertp) | |
394 | "Overlay RECTANGLE with upper left corner at point. | |
395 | Optional argument INSERTP, if non-nil causes RECTANGLE to be inserted. | |
396 | Leaves the region surrounding the rectangle." | |
397 | (let ((indent-tabs-mode nil)) | |
398 | (if (not insertp) | |
399 | (save-excursion | |
400 | (delete-rectangle (point) | |
401 | (progn | |
402 | (picture-forward-column (length (car rectangle))) | |
403 | (picture-move-down (1- (length rectangle))) | |
404 | (point))))) | |
405 | (push-mark) | |
406 | (insert-rectangle rectangle))) | |
407 | ||
408 | \f | |
409 | ;; Picture Keymap, entry and exit points. | |
410 | ||
411 | (defconst picture-mode-map nil) | |
412 | ||
413 | (if (not picture-mode-map) | |
414 | (let ((i ?\ )) | |
415 | (setq picture-mode-map (make-keymap)) | |
416 | (while (< i ?\177) | |
c4fc49b6 | 417 | (define-key picture-mode-map (make-string 1 i) 'picture-self-insert) |
695d13c7 BP |
418 | (setq i (1+ i))) |
419 | (define-key picture-mode-map "\C-f" 'picture-forward-column) | |
420 | (define-key picture-mode-map "\C-b" 'picture-backward-column) | |
421 | (define-key picture-mode-map "\C-d" 'picture-clear-column) | |
422 | (define-key picture-mode-map "\C-c\C-d" 'delete-char) | |
423 | (define-key picture-mode-map "\177" 'picture-backward-clear-column) | |
424 | (define-key picture-mode-map "\C-k" 'picture-clear-line) | |
425 | (define-key picture-mode-map "\C-o" 'picture-open-line) | |
426 | (define-key picture-mode-map "\C-m" 'picture-newline) | |
427 | (define-key picture-mode-map "\C-j" 'picture-duplicate-line) | |
428 | (define-key picture-mode-map "\C-n" 'picture-move-down) | |
429 | (define-key picture-mode-map "\C-p" 'picture-move-up) | |
430 | (define-key picture-mode-map "\C-e" 'picture-end-of-line) | |
431 | (define-key picture-mode-map "\e\t" 'picture-toggle-tab-state) | |
432 | (define-key picture-mode-map "\t" 'picture-tab) | |
433 | (define-key picture-mode-map "\e\t" 'picture-tab-search) | |
434 | (define-key picture-mode-map "\C-c\t" 'picture-set-tab-stops) | |
435 | (define-key picture-mode-map "\C-c\C-k" 'picture-clear-rectangle) | |
436 | (define-key picture-mode-map "\C-c\C-w" 'picture-clear-rectangle-to-register) | |
437 | (define-key picture-mode-map "\C-c\C-y" 'picture-yank-rectangle) | |
438 | (define-key picture-mode-map "\C-c\C-x" 'picture-yank-rectangle-from-register) | |
439 | (define-key picture-mode-map "\C-c\C-c" 'picture-mode-exit) | |
440 | (define-key picture-mode-map "\C-c\C-f" 'picture-motion) | |
441 | (define-key picture-mode-map "\C-c\C-b" 'picture-motion-reverse) | |
442 | (define-key picture-mode-map "\C-c<" 'picture-movement-left) | |
443 | (define-key picture-mode-map "\C-c>" 'picture-movement-right) | |
444 | (define-key picture-mode-map "\C-c^" 'picture-movement-up) | |
445 | (define-key picture-mode-map "\C-c." 'picture-movement-down) | |
446 | (define-key picture-mode-map "\C-c`" 'picture-movement-nw) | |
447 | (define-key picture-mode-map "\C-c'" 'picture-movement-ne) | |
448 | (define-key picture-mode-map "\C-c/" 'picture-movement-sw) | |
449 | (define-key picture-mode-map "\C-c\\" 'picture-movement-se))) | |
450 | ||
451 | (defvar edit-picture-hook nil | |
452 | "If non-nil, it's value is called on entry to Picture mode. | |
453 | Picture mode is invoked by the command \\[edit-picture].") | |
454 | ||
c4fc49b6 RS |
455 | (defvar picture-mode-old-local-map) |
456 | (defvar picture-mode-old-mode-name) | |
457 | (defvar picture-mode-old-major-mode) | |
458 | ||
7229064d | 459 | ;;;###autoload |
695d13c7 BP |
460 | (defun edit-picture () |
461 | "Switch to Picture mode, in which a quarter-plane screen model is used. | |
462 | Printing characters replace instead of inserting themselves with motion | |
463 | afterwards settable by these commands: | |
464 | C-c < Move left after insertion. | |
465 | C-c > Move right after insertion. | |
466 | C-c ^ Move up after insertion. | |
467 | C-c . Move down after insertion. | |
468 | C-c ` Move northwest (nw) after insertion. | |
469 | C-c ' Move northeast (ne) after insertion. | |
470 | C-c / Move southwest (sw) after insertion. | |
471 | C-c \\ Move southeast (se) after insertion. | |
472 | The current direction is displayed in the mode line. The initial | |
473 | direction is right. Whitespace is inserted and tabs are changed to | |
474 | spaces when required by movement. You can move around in the buffer | |
475 | with these commands: | |
476 | C-p Move vertically to SAME column in previous line. | |
477 | C-n Move vertically to SAME column in next line. | |
478 | C-e Move to column following last non-whitespace character. | |
479 | C-f Move right inserting spaces if required. | |
480 | C-b Move left changing tabs to spaces if required. | |
481 | C-c C-f Move in direction of current picture motion. | |
482 | C-c C-b Move in opposite direction of current picture motion. | |
483 | Return Move to beginning of next line. | |
484 | You can edit tabular text with these commands: | |
485 | M-Tab Move to column beneath (or at) next interesting character. | |
486 | `Indents' relative to a previous line. | |
487 | Tab Move to next stop in tab stop list. | |
488 | C-c Tab Set tab stops according to context of this line. | |
489 | With ARG resets tab stops to default (global) value. | |
490 | See also documentation of variable picture-tab-chars | |
491 | which defines \"interesting character\". You can manually | |
492 | change the tab stop list with command \\[edit-tab-stops]. | |
493 | You can manipulate text with these commands: | |
494 | C-d Clear (replace) ARG columns after point without moving. | |
495 | C-c C-d Delete char at point - the command normally assigned to C-d. | |
496 | Delete Clear (replace) ARG columns before point, moving back over them. | |
497 | C-k Clear ARG lines, advancing over them. The cleared | |
498 | text is saved in the kill ring. | |
499 | C-o Open blank line(s) beneath current line. | |
500 | You can manipulate rectangles with these commands: | |
501 | C-c C-k Clear (or kill) a rectangle and save it. | |
502 | C-c C-w Like C-c C-k except rectangle is saved in named register. | |
503 | C-c C-y Overlay (or insert) currently saved rectangle at point. | |
504 | C-c C-x Like C-c C-y except rectangle is taken from named register. | |
505 | \\[copy-rectangle-to-register] Copies a rectangle to a register. | |
506 | \\[advertised-undo] Can undo effects of rectangle overlay commands | |
507 | commands if invoked soon enough. | |
508 | You can return to the previous mode with: | |
509 | C-c C-c Which also strips trailing whitespace from every line. | |
510 | Stripping is suppressed by supplying an argument. | |
511 | ||
512 | Entry to this mode calls the value of edit-picture-hook if non-nil. | |
513 | ||
514 | Note that Picture mode commands will work outside of Picture mode, but | |
515 | they are not defaultly assigned to keys." | |
516 | (interactive) | |
517 | (if (eq major-mode 'edit-picture) | |
518 | (error "You are already editing a Picture.") | |
519 | (make-local-variable 'picture-mode-old-local-map) | |
520 | (setq picture-mode-old-local-map (current-local-map)) | |
521 | (use-local-map picture-mode-map) | |
522 | (make-local-variable 'picture-mode-old-mode-name) | |
523 | (setq picture-mode-old-mode-name mode-name) | |
524 | (make-local-variable 'picture-mode-old-major-mode) | |
525 | (setq picture-mode-old-major-mode major-mode) | |
526 | (setq major-mode 'edit-picture) | |
527 | (make-local-variable 'picture-killed-rectangle) | |
528 | (setq picture-killed-rectangle nil) | |
529 | (make-local-variable 'tab-stop-list) | |
530 | (setq tab-stop-list (default-value 'tab-stop-list)) | |
531 | (make-local-variable 'picture-tab-chars) | |
532 | (setq picture-tab-chars (default-value 'picture-tab-chars)) | |
533 | (make-local-variable 'picture-vertical-step) | |
534 | (make-local-variable 'picture-horizontal-step) | |
535 | (picture-set-motion 0 1) | |
e0dad66e RS |
536 | ;; edit-picture-hook is what we used to run, picture-mode-hook is in doc. |
537 | (run-hooks 'edit-picture-hook 'picture-mode-hook) | |
695d13c7 BP |
538 | (message |
539 | (substitute-command-keys | |
540 | "Type \\[picture-mode-exit] in this buffer to return it to %s mode.") | |
541 | picture-mode-old-mode-name))) | |
542 | ||
6503cec3 JB |
543 | ;;;###autoload |
544 | (fset 'picture-mode 'edit-picture) | |
695d13c7 BP |
545 | |
546 | (defun picture-mode-exit (&optional nostrip) | |
547 | "Undo edit-picture and return to previous major mode. | |
548 | With no argument strips whitespace from end of every line in Picture buffer | |
549 | otherwise just return to previous mode." | |
550 | (interactive "P") | |
551 | (if (not (eq major-mode 'edit-picture)) | |
552 | (error "You aren't editing a Picture.") | |
553 | (if (not nostrip) (picture-clean)) | |
554 | (setq mode-name picture-mode-old-mode-name) | |
555 | (use-local-map picture-mode-old-local-map) | |
556 | (setq major-mode picture-mode-old-major-mode) | |
557 | (kill-local-variable 'tab-stop-list) | |
558 | ;; Kludge - force the mode line to be updated. Is there a better | |
559 | ;; way to do this? | |
560 | (set-buffer-modified-p (buffer-modified-p)))) | |
561 | ||
562 | (defun picture-clean () | |
563 | "Eliminate whitespace at ends of lines." | |
564 | (save-excursion | |
565 | (goto-char (point-min)) | |
566 | (while (re-search-forward "[ \t][ \t]*$" nil t) | |
567 | (delete-region (match-beginning 0) (point))))) | |
49116ac0 JB |
568 | |
569 | (provide 'picture) | |
570 | ||
6594deb0 | 571 | ;;; picture.el ends here |