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1 | ;; "Picture mode" -- editing using quarter-plane screen model. |
2 | ;; Copyright (C) 1985 Free Software Foundation, Inc. | |
3 | ;; Principal author K. Shane Hartman | |
4 | ||
5 | ;; This file is part of GNU Emacs. | |
6 | ||
7 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
8 | ;; it under the terms of the GNU General Public License as published by | |
9 | ;; the Free Software Foundation; either version 1, or (at your option) | |
10 | ;; any later version. | |
11 | ||
12 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
13 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ;; GNU General Public License for more details. | |
16 | ||
17 | ;; You should have received a copy of the GNU General Public License | |
18 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
19 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | ||
21 | ||
22 | (provide 'picture) | |
23 | ||
24 | (defun move-to-column-force (column) | |
25 | "Move to column COLUMN in current line. | |
26 | Differs from `move-to-column' in that it creates or modifies whitespace | |
27 | if necessary to attain exactly the specified column." | |
28 | (move-to-column column) | |
29 | (let ((col (current-column))) | |
30 | (if (< col column) | |
31 | (indent-to column) | |
32 | (if (and (/= col column) | |
33 | (= (preceding-char) ?\t)) | |
34 | (let (indent-tabs-mode) | |
35 | (delete-char -1) | |
36 | (indent-to col) | |
37 | (move-to-column column)))))) | |
38 | ||
39 | \f | |
40 | ;; Picture Movement Commands | |
41 | ||
42 | (defun picture-end-of-line (&optional arg) | |
43 | "Position point after last non-blank character on current line. | |
44 | With ARG not nil, move forward ARG - 1 lines first. | |
45 | If scan reaches end of buffer, stop there without error." | |
46 | (interactive "P") | |
47 | (if arg (forward-line (1- (prefix-numeric-value arg)))) | |
48 | (beginning-of-line) | |
49 | (skip-chars-backward " \t" (prog1 (point) (end-of-line)))) | |
50 | ||
51 | (defun picture-forward-column (arg) | |
52 | "Move cursor right, making whitespace if necessary. | |
53 | With argument, move that many columns." | |
54 | (interactive "p") | |
55 | (move-to-column-force (+ (current-column) arg))) | |
56 | ||
57 | (defun picture-backward-column (arg) | |
58 | "Move cursor left, making whitespace if necessary. | |
59 | With argument, move that many columns." | |
60 | (interactive "p") | |
61 | (move-to-column-force (- (current-column) arg))) | |
62 | ||
63 | (defun picture-move-down (arg) | |
64 | "Move vertically down, making whitespace if necessary. | |
65 | With argument, move that many lines." | |
66 | (interactive "p") | |
67 | (let ((col (current-column))) | |
68 | (picture-newline arg) | |
69 | (move-to-column-force col))) | |
70 | ||
71 | (defconst picture-vertical-step 0 | |
72 | "Amount to move vertically after text character in Picture mode.") | |
73 | ||
74 | (defconst picture-horizontal-step 1 | |
75 | "Amount to move horizontally after text character in Picture mode.") | |
76 | ||
77 | (defun picture-move-up (arg) | |
78 | "Move vertically up, making whitespace if necessary. | |
79 | With argument, move that many lines." | |
80 | (interactive "p") | |
81 | (picture-move-down (- arg))) | |
82 | ||
83 | (defun picture-movement-right () | |
84 | "Move right after self-inserting character in Picture mode." | |
85 | (interactive) | |
86 | (picture-set-motion 0 1)) | |
87 | ||
88 | (defun picture-movement-left () | |
89 | "Move left after self-inserting character in Picture mode." | |
90 | (interactive) | |
91 | (picture-set-motion 0 -1)) | |
92 | ||
93 | (defun picture-movement-up () | |
94 | "Move up after self-inserting character in Picture mode." | |
95 | (interactive) | |
96 | (picture-set-motion -1 0)) | |
97 | ||
98 | (defun picture-movement-down () | |
99 | "Move down after self-inserting character in Picture mode." | |
100 | (interactive) | |
101 | (picture-set-motion 1 0)) | |
102 | ||
103 | (defun picture-movement-nw () | |
104 | "Move up and left after self-inserting character in Picture mode." | |
105 | (interactive) | |
106 | (picture-set-motion -1 -1)) | |
107 | ||
108 | (defun picture-movement-ne () | |
109 | "Move up and right after self-inserting character in Picture mode." | |
110 | (interactive) | |
111 | (picture-set-motion -1 1)) | |
112 | ||
113 | (defun picture-movement-sw () | |
114 | "Move down and left after self-inserting character in Picture mode." | |
115 | (interactive) | |
116 | (picture-set-motion 1 -1)) | |
117 | ||
118 | (defun picture-movement-se () | |
119 | "Move down and right after self-inserting character in Picture mode." | |
120 | (interactive) | |
121 | (picture-set-motion 1 1)) | |
122 | ||
123 | (defun picture-set-motion (vert horiz) | |
124 | "Set VERTICAL and HORIZONTAL increments for movement in Picture mode. | |
125 | The mode line is updated to reflect the current direction." | |
126 | (setq picture-vertical-step vert | |
127 | picture-horizontal-step horiz) | |
128 | (setq mode-name | |
129 | (format "Picture:%s" | |
130 | (car (nthcdr (+ 1 (% horiz 2) (* 3 (1+ (% vert 2)))) | |
131 | '(nw up ne left none right sw down se))))) | |
132 | ;; Kludge - force the mode line to be updated. Is there a better | |
133 | ;; way to this? | |
134 | (set-buffer-modified-p (buffer-modified-p)) | |
135 | (message "")) | |
136 | ||
137 | (defun picture-move () | |
138 | "Move in direction of `picture-vertical-step' and `picture-horizontal-step'." | |
139 | (picture-move-down picture-vertical-step) | |
140 | (picture-forward-column picture-horizontal-step)) | |
141 | ||
142 | (defun picture-motion (arg) | |
143 | "Move point in direction of current picture motion in Picture mode. | |
144 | With ARG do it that many times. Useful for delineating rectangles in | |
145 | conjunction with diagonal picture motion. | |
146 | Do \\[command-apropos] picture-movement to see commands which control motion." | |
147 | (interactive "p") | |
148 | (picture-move-down (* arg picture-vertical-step)) | |
149 | (picture-forward-column (* arg picture-horizontal-step))) | |
150 | ||
151 | (defun picture-motion-reverse (arg) | |
152 | "Move point in direction opposite of current picture motion in Picture mode. | |
153 | With ARG do it that many times. Useful for delineating rectangles in | |
154 | conjunction with diagonal picture motion. | |
155 | Do \\[command-apropos] `picture-movement' to see commands which control motion." | |
156 | (interactive "p") | |
157 | (picture-motion (- arg))) | |
158 | ||
159 | \f | |
160 | ;; Picture insertion and deletion. | |
161 | ||
162 | (defun picture-self-insert (arg) | |
163 | "Insert this character in place of character previously at the cursor. | |
164 | The cursor then moves in the direction you previously specified | |
165 | with the commands `picture-movement-right', `picture-movement-up', etc. | |
166 | Do \\[command-apropos] `picture-movement' to see those commands." | |
167 | (interactive "p") | |
168 | (while (> arg 0) | |
169 | (setq arg (1- arg)) | |
170 | (move-to-column-force (1+ (current-column))) | |
171 | (delete-char -1) | |
172 | (insert last-input-char) | |
173 | (forward-char -1) | |
174 | (picture-move))) | |
175 | ||
176 | (defun picture-clear-column (arg) | |
177 | "Clear out ARG columns after point without moving." | |
178 | (interactive "p") | |
179 | (let* ((opoint (point)) | |
180 | (original-col (current-column)) | |
181 | (target-col (+ original-col arg))) | |
182 | (move-to-column-force target-col) | |
183 | (delete-region opoint (point)) | |
184 | (save-excursion | |
185 | (indent-to (max target-col original-col))))) | |
186 | ||
187 | (defun picture-backward-clear-column (arg) | |
188 | "Clear out ARG columns before point, moving back over them." | |
189 | (interactive "p") | |
190 | (picture-clear-column (- arg))) | |
191 | ||
192 | (defun picture-clear-line (arg) | |
193 | "Clear out rest of line; if at end of line, advance to next line. | |
194 | Cleared-out line text goes into the kill ring, as do newlines that are | |
195 | advanced over. With argument, clear out (and save in kill ring) that | |
196 | many lines." | |
197 | (interactive "P") | |
198 | (if arg | |
199 | (progn | |
200 | (setq arg (prefix-numeric-value arg)) | |
201 | (kill-line arg) | |
202 | (newline (if (> arg 0) arg (- arg)))) | |
203 | (if (looking-at "[ \t]*$") | |
204 | (kill-ring-save (point) (progn (forward-line 1) (point))) | |
205 | (kill-region (point) (progn (end-of-line) (point)))))) | |
206 | ||
207 | (defun picture-newline (arg) | |
208 | "Move to the beginning of the following line. | |
209 | With argument, moves that many lines (up, if negative argument); | |
210 | always moves to the beginning of a line." | |
211 | (interactive "p") | |
212 | (if (< arg 0) | |
213 | (forward-line arg) | |
214 | (while (> arg 0) | |
215 | (end-of-line) | |
216 | (if (eobp) (newline) (forward-char 1)) | |
217 | (setq arg (1- arg))))) | |
218 | ||
219 | (defun picture-open-line (arg) | |
220 | "Insert an empty line after the current line. | |
221 | With positive argument insert that many lines." | |
222 | (interactive "p") | |
223 | (save-excursion | |
224 | (end-of-line) | |
225 | (open-line arg))) | |
226 | ||
227 | (defun picture-duplicate-line () | |
228 | "Insert a duplicate of the current line, below it." | |
229 | (interactive) | |
230 | (save-excursion | |
231 | (let ((contents | |
232 | (buffer-substring | |
233 | (progn (beginning-of-line) (point)) | |
234 | (progn (picture-newline 1) (point))))) | |
235 | (forward-line -1) | |
236 | (insert contents)))) | |
237 | ||
238 | \f | |
239 | ;; Picture Tabs | |
240 | ||
241 | (defvar picture-tab-chars "!-~" | |
242 | "*A character set which controls behavior of commands | |
243 | \\[picture-set-tab-stops] and \\[picture-tab-search]. It is NOT a | |
244 | regular expression, any regexp special characters will be quoted. | |
245 | It defines a set of \"interesting characters\" to look for when setting | |
246 | \(or searching for) tab stops, initially \"!-~\" (all printing characters). | |
247 | For example, suppose that you are editing a table which is formatted thus: | |
248 | | foo | bar + baz | 23 * | |
249 | | bubbles | and + etc | 97 * | |
250 | and that `picture-tab-chars' is \"|+*\". Then invoking | |
251 | \\[picture-set-tab-stops] on either of the previous lines would result | |
252 | in the following tab stops | |
253 | : : : : | |
254 | Another example - \"A-Za-z0-9\" would produce the tab stops | |
255 | : : : : | |
256 | ||
257 | Note that if you want the character `-' to be in the set, it must be | |
258 | included in a range or else appear in a context where it cannot be | |
259 | taken for indicating a range (e.g. \"-A-Z\" declares the set to be the | |
260 | letters `A' through `Z' and the character `-'). If you want the | |
261 | character `\\' in the set it must be preceded by itself: \"\\\\\". | |
262 | ||
263 | The command \\[picture-tab-search] is defined to move beneath (or to) a | |
264 | character belonging to this set independent of the tab stops list.") | |
265 | ||
266 | (defun picture-set-tab-stops (&optional arg) | |
267 | "Set value of `tab-stop-list' according to context of this line. | |
268 | This controls the behavior of \\[picture-tab]. A tab stop is set at | |
269 | every column occupied by an \"interesting character\" that is preceded | |
270 | by whitespace. Interesting characters are defined by the variable | |
271 | `picture-tab-chars', see its documentation for an example of usage. | |
272 | With ARG, just (re)set `tab-stop-list' to its default value. The tab | |
273 | stops computed are displayed in the minibuffer with `:' at each stop." | |
274 | (interactive "P") | |
275 | (save-excursion | |
276 | (let (tabs) | |
277 | (if arg | |
278 | (setq tabs (default-value 'tab-stop-list)) | |
279 | (let ((regexp (concat "[ \t]+[" (regexp-quote picture-tab-chars) "]"))) | |
280 | (beginning-of-line) | |
281 | (let ((bol (point))) | |
282 | (end-of-line) | |
283 | (while (re-search-backward regexp bol t) | |
284 | (skip-chars-forward " \t") | |
285 | (setq tabs (cons (current-column) tabs))) | |
286 | (if (null tabs) | |
287 | (error "No characters in set %s on this line." | |
288 | (regexp-quote picture-tab-chars)))))) | |
289 | (setq tab-stop-list tabs) | |
290 | (let ((blurb (make-string (1+ (nth (1- (length tabs)) tabs)) ?\ ))) | |
291 | (while tabs | |
292 | (aset blurb (car tabs) ?:) | |
293 | (setq tabs (cdr tabs))) | |
294 | (message blurb))))) | |
295 | ||
296 | (defun picture-tab-search (&optional arg) | |
297 | "Move to column beneath next interesting char in previous line. | |
298 | With ARG move to column occupied by next interesting character in this | |
299 | line. The character must be preceded by whitespace. | |
300 | \"interesting characters\" are defined by variable `picture-tab-chars'. | |
301 | If no such character is found, move to beginning of line." | |
302 | (interactive "P") | |
303 | (let ((target (current-column))) | |
304 | (save-excursion | |
305 | (if (and (not arg) | |
306 | (progn | |
307 | (beginning-of-line) | |
308 | (skip-chars-backward | |
309 | (concat "^" (regexp-quote picture-tab-chars)) | |
310 | (point-min)) | |
311 | (not (bobp)))) | |
312 | (move-to-column target)) | |
313 | (if (re-search-forward | |
314 | (concat "[ \t]+[" (regexp-quote picture-tab-chars) "]") | |
315 | (save-excursion (end-of-line) (point)) | |
316 | 'move) | |
317 | (setq target (1- (current-column))) | |
318 | (setq target nil))) | |
319 | (if target | |
320 | (move-to-column-force target) | |
321 | (beginning-of-line)))) | |
322 | ||
323 | (defun picture-tab (&optional arg) | |
324 | "Tab transparently (just move point) to next tab stop. | |
325 | With prefix arg, overwrite the traversed text with spaces. The tab stop | |
326 | list can be changed by \\[picture-set-tab-stops] and \\[edit-tab-stops]. | |
327 | See also documentation for variable `picture-tab-chars'." | |
328 | (interactive "P") | |
329 | (let* ((opoint (point))) | |
330 | (move-to-tab-stop) | |
331 | (if arg | |
332 | (let (indent-tabs-mode | |
333 | (column (current-column))) | |
334 | (delete-region opoint (point)) | |
335 | (indent-to column))))) | |
336 | \f | |
337 | ;; Picture Rectangles | |
338 | ||
339 | (defconst picture-killed-rectangle nil | |
340 | "Rectangle killed or copied by \\[picture-clear-rectangle] in Picture mode. | |
341 | The contents can be retrieved by \\[picture-yank-rectangle]") | |
342 | ||
343 | (defun picture-clear-rectangle (start end &optional killp) | |
344 | "Clear and save rectangle delineated by point and mark. | |
345 | The rectangle is saved for yanking by \\[picture-yank-rectangle] and replaced | |
346 | with whitespace. The previously saved rectangle, if any, is lost. With | |
347 | prefix argument, the rectangle is actually killed, shifting remaining text." | |
348 | (interactive "r\nP") | |
349 | (setq picture-killed-rectangle (picture-snarf-rectangle start end killp))) | |
350 | ||
351 | (defun picture-clear-rectangle-to-register (start end register &optional killp) | |
352 | "Clear rectangle delineated by point and mark into REGISTER. | |
353 | The rectangle is saved in REGISTER and replaced with whitespace. With | |
354 | prefix argument, the rectangle is actually killed, shifting remaining text." | |
355 | (interactive "r\ncRectangle to register: \nP") | |
356 | (set-register register (picture-snarf-rectangle start end killp))) | |
357 | ||
358 | (defun picture-snarf-rectangle (start end &optional killp) | |
359 | (let ((column (current-column)) | |
360 | (indent-tabs-mode nil)) | |
361 | (prog1 (save-excursion | |
362 | (if killp | |
363 | (delete-extract-rectangle start end) | |
364 | (prog1 (extract-rectangle start end) | |
365 | (clear-rectangle start end)))) | |
366 | (move-to-column-force column)))) | |
367 | ||
368 | (defun picture-yank-rectangle (&optional insertp) | |
369 | "Overlay rectangle saved by \\[picture-clear-rectangle] | |
370 | The rectangle is positioned with upper left corner at point, overwriting | |
371 | existing text. With prefix argument, the rectangle is inserted instead, | |
372 | shifting existing text. Leaves mark at one corner of rectangle and | |
373 | point at the other (diagonally opposed) corner." | |
374 | (interactive "P") | |
375 | (if (not (consp picture-killed-rectangle)) | |
376 | (error "No rectangle saved.") | |
377 | (picture-insert-rectangle picture-killed-rectangle insertp))) | |
378 | ||
379 | (defun picture-yank-rectangle-from-register (register &optional insertp) | |
380 | "Overlay rectangle saved in REGISTER. | |
381 | The rectangle is positioned with upper left corner at point, overwriting | |
382 | existing text. With prefix argument, the rectangle is | |
383 | inserted instead, shifting existing text. Leaves mark at one corner | |
384 | of rectangle and point at the other (diagonally opposed) corner." | |
385 | (interactive "cRectangle from register: \nP") | |
386 | (let ((rectangle (get-register register))) | |
387 | (if (not (consp rectangle)) | |
388 | (error "Register %c does not contain a rectangle." register) | |
389 | (picture-insert-rectangle rectangle insertp)))) | |
390 | ||
391 | (defun picture-insert-rectangle (rectangle &optional insertp) | |
392 | "Overlay RECTANGLE with upper left corner at point. | |
393 | Optional argument INSERTP, if non-nil causes RECTANGLE to be inserted. | |
394 | Leaves the region surrounding the rectangle." | |
395 | (let ((indent-tabs-mode nil)) | |
396 | (if (not insertp) | |
397 | (save-excursion | |
398 | (delete-rectangle (point) | |
399 | (progn | |
400 | (picture-forward-column (length (car rectangle))) | |
401 | (picture-move-down (1- (length rectangle))) | |
402 | (point))))) | |
403 | (push-mark) | |
404 | (insert-rectangle rectangle))) | |
405 | ||
406 | \f | |
407 | ;; Picture Keymap, entry and exit points. | |
408 | ||
409 | (defconst picture-mode-map nil) | |
410 | ||
411 | (if (not picture-mode-map) | |
412 | (let ((i ?\ )) | |
413 | (setq picture-mode-map (make-keymap)) | |
414 | (while (< i ?\177) | |
415 | (aset picture-mode-map i 'picture-self-insert) | |
416 | (setq i (1+ i))) | |
417 | (define-key picture-mode-map "\C-f" 'picture-forward-column) | |
418 | (define-key picture-mode-map "\C-b" 'picture-backward-column) | |
419 | (define-key picture-mode-map "\C-d" 'picture-clear-column) | |
420 | (define-key picture-mode-map "\C-c\C-d" 'delete-char) | |
421 | (define-key picture-mode-map "\177" 'picture-backward-clear-column) | |
422 | (define-key picture-mode-map "\C-k" 'picture-clear-line) | |
423 | (define-key picture-mode-map "\C-o" 'picture-open-line) | |
424 | (define-key picture-mode-map "\C-m" 'picture-newline) | |
425 | (define-key picture-mode-map "\C-j" 'picture-duplicate-line) | |
426 | (define-key picture-mode-map "\C-n" 'picture-move-down) | |
427 | (define-key picture-mode-map "\C-p" 'picture-move-up) | |
428 | (define-key picture-mode-map "\C-e" 'picture-end-of-line) | |
429 | (define-key picture-mode-map "\e\t" 'picture-toggle-tab-state) | |
430 | (define-key picture-mode-map "\t" 'picture-tab) | |
431 | (define-key picture-mode-map "\e\t" 'picture-tab-search) | |
432 | (define-key picture-mode-map "\C-c\t" 'picture-set-tab-stops) | |
433 | (define-key picture-mode-map "\C-c\C-k" 'picture-clear-rectangle) | |
434 | (define-key picture-mode-map "\C-c\C-w" 'picture-clear-rectangle-to-register) | |
435 | (define-key picture-mode-map "\C-c\C-y" 'picture-yank-rectangle) | |
436 | (define-key picture-mode-map "\C-c\C-x" 'picture-yank-rectangle-from-register) | |
437 | (define-key picture-mode-map "\C-c\C-c" 'picture-mode-exit) | |
438 | (define-key picture-mode-map "\C-c\C-f" 'picture-motion) | |
439 | (define-key picture-mode-map "\C-c\C-b" 'picture-motion-reverse) | |
440 | (define-key picture-mode-map "\C-c<" 'picture-movement-left) | |
441 | (define-key picture-mode-map "\C-c>" 'picture-movement-right) | |
442 | (define-key picture-mode-map "\C-c^" 'picture-movement-up) | |
443 | (define-key picture-mode-map "\C-c." 'picture-movement-down) | |
444 | (define-key picture-mode-map "\C-c`" 'picture-movement-nw) | |
445 | (define-key picture-mode-map "\C-c'" 'picture-movement-ne) | |
446 | (define-key picture-mode-map "\C-c/" 'picture-movement-sw) | |
447 | (define-key picture-mode-map "\C-c\\" 'picture-movement-se))) | |
448 | ||
449 | (defvar edit-picture-hook nil | |
450 | "If non-nil, it's value is called on entry to Picture mode. | |
451 | Picture mode is invoked by the command \\[edit-picture].") | |
452 | ||
453 | (defun edit-picture () | |
454 | "Switch to Picture mode, in which a quarter-plane screen model is used. | |
455 | Printing characters replace instead of inserting themselves with motion | |
456 | afterwards settable by these commands: | |
457 | C-c < Move left after insertion. | |
458 | C-c > Move right after insertion. | |
459 | C-c ^ Move up after insertion. | |
460 | C-c . Move down after insertion. | |
461 | C-c ` Move northwest (nw) after insertion. | |
462 | C-c ' Move northeast (ne) after insertion. | |
463 | C-c / Move southwest (sw) after insertion. | |
464 | C-c \\ Move southeast (se) after insertion. | |
465 | The current direction is displayed in the mode line. The initial | |
466 | direction is right. Whitespace is inserted and tabs are changed to | |
467 | spaces when required by movement. You can move around in the buffer | |
468 | with these commands: | |
469 | C-p Move vertically to SAME column in previous line. | |
470 | C-n Move vertically to SAME column in next line. | |
471 | C-e Move to column following last non-whitespace character. | |
472 | C-f Move right inserting spaces if required. | |
473 | C-b Move left changing tabs to spaces if required. | |
474 | C-c C-f Move in direction of current picture motion. | |
475 | C-c C-b Move in opposite direction of current picture motion. | |
476 | Return Move to beginning of next line. | |
477 | You can edit tabular text with these commands: | |
478 | M-Tab Move to column beneath (or at) next interesting character. | |
479 | `Indents' relative to a previous line. | |
480 | Tab Move to next stop in tab stop list. | |
481 | C-c Tab Set tab stops according to context of this line. | |
482 | With ARG resets tab stops to default (global) value. | |
483 | See also documentation of variable picture-tab-chars | |
484 | which defines \"interesting character\". You can manually | |
485 | change the tab stop list with command \\[edit-tab-stops]. | |
486 | You can manipulate text with these commands: | |
487 | C-d Clear (replace) ARG columns after point without moving. | |
488 | C-c C-d Delete char at point - the command normally assigned to C-d. | |
489 | Delete Clear (replace) ARG columns before point, moving back over them. | |
490 | C-k Clear ARG lines, advancing over them. The cleared | |
491 | text is saved in the kill ring. | |
492 | C-o Open blank line(s) beneath current line. | |
493 | You can manipulate rectangles with these commands: | |
494 | C-c C-k Clear (or kill) a rectangle and save it. | |
495 | C-c C-w Like C-c C-k except rectangle is saved in named register. | |
496 | C-c C-y Overlay (or insert) currently saved rectangle at point. | |
497 | C-c C-x Like C-c C-y except rectangle is taken from named register. | |
498 | \\[copy-rectangle-to-register] Copies a rectangle to a register. | |
499 | \\[advertised-undo] Can undo effects of rectangle overlay commands | |
500 | commands if invoked soon enough. | |
501 | You can return to the previous mode with: | |
502 | C-c C-c Which also strips trailing whitespace from every line. | |
503 | Stripping is suppressed by supplying an argument. | |
504 | ||
505 | Entry to this mode calls the value of edit-picture-hook if non-nil. | |
506 | ||
507 | Note that Picture mode commands will work outside of Picture mode, but | |
508 | they are not defaultly assigned to keys." | |
509 | (interactive) | |
510 | (if (eq major-mode 'edit-picture) | |
511 | (error "You are already editing a Picture.") | |
512 | (make-local-variable 'picture-mode-old-local-map) | |
513 | (setq picture-mode-old-local-map (current-local-map)) | |
514 | (use-local-map picture-mode-map) | |
515 | (make-local-variable 'picture-mode-old-mode-name) | |
516 | (setq picture-mode-old-mode-name mode-name) | |
517 | (make-local-variable 'picture-mode-old-major-mode) | |
518 | (setq picture-mode-old-major-mode major-mode) | |
519 | (setq major-mode 'edit-picture) | |
520 | (make-local-variable 'picture-killed-rectangle) | |
521 | (setq picture-killed-rectangle nil) | |
522 | (make-local-variable 'tab-stop-list) | |
523 | (setq tab-stop-list (default-value 'tab-stop-list)) | |
524 | (make-local-variable 'picture-tab-chars) | |
525 | (setq picture-tab-chars (default-value 'picture-tab-chars)) | |
526 | (make-local-variable 'picture-vertical-step) | |
527 | (make-local-variable 'picture-horizontal-step) | |
528 | (picture-set-motion 0 1) | |
529 | (run-hooks 'edit-picture-hook) | |
530 | (message | |
531 | (substitute-command-keys | |
532 | "Type \\[picture-mode-exit] in this buffer to return it to %s mode.") | |
533 | picture-mode-old-mode-name))) | |
534 | ||
535 | (fset 'picture-mode 'edit-picture) ; for the confused | |
536 | ||
537 | (defun picture-mode-exit (&optional nostrip) | |
538 | "Undo edit-picture and return to previous major mode. | |
539 | With no argument strips whitespace from end of every line in Picture buffer | |
540 | otherwise just return to previous mode." | |
541 | (interactive "P") | |
542 | (if (not (eq major-mode 'edit-picture)) | |
543 | (error "You aren't editing a Picture.") | |
544 | (if (not nostrip) (picture-clean)) | |
545 | (setq mode-name picture-mode-old-mode-name) | |
546 | (use-local-map picture-mode-old-local-map) | |
547 | (setq major-mode picture-mode-old-major-mode) | |
548 | (kill-local-variable 'tab-stop-list) | |
549 | ;; Kludge - force the mode line to be updated. Is there a better | |
550 | ;; way to do this? | |
551 | (set-buffer-modified-p (buffer-modified-p)))) | |
552 | ||
553 | (defun picture-clean () | |
554 | "Eliminate whitespace at ends of lines." | |
555 | (save-excursion | |
556 | (goto-char (point-min)) | |
557 | (while (re-search-forward "[ \t][ \t]*$" nil t) | |
558 | (delete-region (match-beginning 0) (point))))) |