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72c0ae01 ER |
1 | ;;; two-column.el --- minor mode for editing of two-column text |
2 | ||
e6b72410 KH |
3 | ;; Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc. |
4 | ||
5 | ;; Author: Daniel.Pfeiffer@Informatik.START.dbp.de, fax (+49 69) 7588-2389 | |
6 | ;; Adapted-By: ESR, Daniel Pfeiffer | |
7 | ||
8 | ;; Esperanto: English: | |
9 | ||
10 | ;; ^Ci dosiero estas ero de GNU Emacs. This file is part of GNU Emacs. | |
11 | ||
12 | ;; GNU Emacs estas libera programaro; GNU Emacs is free software; you can | |
13 | ;; vi povas disdoni ^gin kaj/a^u modifi redistribute it and/or modify it | |
14 | ;; ^gin sub la kondi^coj de la GNU under the terms of the GNU General | |
15 | ;; ^Generala Publika Licenco kiel pub- Public License as published by the | |
16 | ;; likigita far la Liberprogramara Fon- Free Software Foundation; either | |
17 | ;; da^jo; a^u eldono 2a, a^u (la^u via version 2, or (at your option) any | |
18 | ;; elekto) ajna posta eldono. later version. | |
19 | ||
20 | ;; GNU Emacs estas disdonata en la GNU Emacs is distributed in the hope | |
21 | ;; espero ke ^gi estos utila, sed SEN that it will be useful, but WITHOUT | |
22 | ;; IA GARANTIO; sen e^c la implicita ANY WARRANTY; without even the | |
23 | ;; garantio de VENDEBLECO a^u PRETECO implied warranty of MERCHANTABILITY | |
24 | ;; POR DETERMINITA CELO. Vidu la GNU or FITNESS FOR A PARTICULAR PURPOSE. | |
25 | ;; ^Generala Publika Licenco por plenaj See the GNU General Public License | |
26 | ;; detaloj. for more details. | |
27 | ||
28 | ;; Vi devus ricevinti kopion de la GNU You should have received a copy of | |
29 | ;; ^Generala Publika Licenco kune kun the GNU General Public License along | |
30 | ;; GNU Emacs; vidu la dosieron COPYING. with GNU Emacs; see the file | |
31 | ;; Alikaze skribu al la COPYING. If not, write to the | |
32 | ||
8fe9ecef KH |
33 | ;; Free Software Foundation, 59 Temple Place - Suite 330 |
34 | ;; Boston, MA 02111-1307, USA. | |
e6b72410 KH |
35 | |
36 | ||
37 | ;;; Komentario: Commentary: | |
38 | ||
39 | ;; Tiu programaro ebligas vin redakti This package gives you the ability | |
40 | ;; dukolumnan tekston. to edit text in a two-column format. | |
41 | ||
42 | ||
43 | ;; Vi havas tri eblecojn por eki tiun You have three ways to start up this | |
44 | ;; mal^cefan modalon. ^Ciu donas al vi minor mode. Each gives you a | |
45 | ;; horizontale disigatan fenestron, si- horizontally split window similar to | |
46 | ;; milan al fina apareco de via teksto: the final outcome of your text: | |
47 | ||
48 | ||
49 | ;; f2 2 asocias novan bufron nomatan associates a new buffer called | |
50 | ;; C-x 6 2 same, sed kun 2C/ anta^u. the same, but with 2C/ | |
51 | ;; prepended. | |
52 | ||
53 | ;; f2 b asocias alian bufron. Vi povas associates another buffer. | |
54 | ;; C-x 6 b anka^u asocii dataron, se vi This can be used to associate a | |
55 | ;; ^jus anta^ue faris C-x C-f. file if you just did C-x C-f. | |
56 | ||
57 | ;; f2 s disigas jam dukolumnan tekston splits a two-column text into | |
58 | ;; C-x 6 s en du bufroj ekde la nuna two buffers from the current | |
59 | ;; linio, kaj je la nuna kolumno. line and at the current column. | |
60 | ;; La anta^uaj signoj (ofte The preceding characters (often | |
61 | ;; tabeligilo a^u |) estas la tab or |) are the column | |
62 | ;; kolumna disiganto. Linioj kiuj separator. Lines that don't | |
63 | ;; ne enhavas ilin ne estas have them won't be separated. | |
64 | ;; disigitaj. Kiel la kvara kaj Like the fourth and fifth line | |
65 | ;; la kvina linio se vi disigas if you split this file from | |
66 | ;; ^ci dataron ekde la unua angla the first english word. | |
67 | ;; vorto. | |
68 | ||
69 | ;; Se vi volas meti longajn liniojn If you include long lines, i.e which | |
70 | ;; (ekz. programerojn) en la kunigotan will span both columns (eg. source | |
71 | ;; tekston, ili devas esti en la code), they should be in what will | |
72 | ;; estonte unua kolumno. La alia devas be the first column, with the | |
73 | ;; havi vakajn linion apud ili. associated buffer having empty lines | |
74 | ;; next to them. | |
75 | ||
76 | ;; Averto: en Emacs kiam vi ^san^gas la Attention: in Emacs when you change | |
77 | ;; ^cefan modalon, la mal^cefaj modaloj the major mode, the minor modes are | |
78 | ;; estas anka^u elmemorigitaj. Tiu- also purged from memory. In that | |
79 | ;; okaze vi devas religi la du bufrojn case you must reassociate the two | |
80 | ;; per iu C-x 6-ordono, ekz. C-x 6 b. buffers with any C-x 6-command, e.g. | |
81 | ;; C-x 6 b. | |
82 | ||
83 | ;; Kiam vi estos kontenta de la When you have edited both buffers to | |
84 | ;; rezulto, vi kunmetos la du kolumnojn your content, you merge them with | |
85 | ;; per C-x 6 1. Se vi poste vidas C-x 6 1. If you then see a problem, | |
86 | ;; problemon, vi neniigu la kunmeton you undo the merge with C-x u and | |
87 | ;; per C-x u kaj plue modifu la du continue to edit the two buffers. | |
88 | ;; bufrojn. Kiam vi ne plu volas tajpi When you no longer want to edit in | |
89 | ;; dukolumne, vi eliru el la mal^cefa two columns, you turn off the minor | |
90 | ;; modalo per C-x 6 d. mode with C-x 6 d. | |
91 | ||
92 | ||
93 | ;; Aldone al dukolumna redaktado, ek- In addition to two-column editing of | |
94 | ;; zemple por skribi dulingvan tekston text, for example for writing a | |
95 | ;; flank-al-flanke kiel ^ci tiu, aliaj bilingual text side-by-side as shown | |
96 | ;; interesaj uzoj trovitas por tiu mal- here, other interesting uses have | |
97 | ;; ^cefa modalo: been found for this minor mode: | |
98 | ||
99 | ;; Vi povas disigi la kolumnojn per {+} You can separate the columns with | |
100 | ;; ajna pla^ca ^ceno starigante {+} any string that pleases you, by | |
101 | ;; `2C-separator'. Ekzemple "{+} " {+} setting `2C-separator'. For example | |
102 | ;; por amuzi^gi. f2 s a^u C-x 6 s {+} "{+} " if you'd like to have fun. | |
103 | ;; traktas tiujn kun prefiksa {+} f2 s or C-x 6 s handles these with a | |
104 | ;; argumento kiu signifas la longon {+} prefix argument that means the | |
105 | ;; de tia ^ceno. {+} desired length of such a string. | |
106 | ||
107 | ||
108 | ;; Programistoj eble ^satus la eblecon Programmers might like the ability | |
109 | ;; forspliti la komentarian kolumnon de to split off the comment column of a | |
110 | ;; dosiero kiel la sekvanta. Vi povas file that looks like the following. | |
111 | ;; rearan^gigi la paragrafon. La pro- You can fill-paragraph the comment. | |
112 | ;; blemo estas ke koda^jo tuj lar- The problem is, code quickly gets | |
113 | ;; ^gi^gas, tiel ke vi bezonas pli rather wide, so you need to use a | |
114 | ;; mallar^gan komentarian kolumnon. narrower comment column. Code lines | |
115 | ;; Koda^jaj linioj tra `comment-column' that reach beyond `comment-column' | |
116 | ;; ne problemas, krom ke vi ne vidos are no problem, except that you | |
117 | ;; iliajn finojn dum redaktado. won't see their end during editing. | |
118 | ||
119 | ||
72c0ae01 ER |
120 | ;; BEGIN -- This is just some meaningless |
121 | ;; FOR i IN 1..10 LOOP -- code in Ada, that runs foobar | |
e6b72410 | 122 | ;; foobar( i ); -- once for each argument from one |
72c0ae01 ER |
123 | ;; END LOOP; -- to ten, and then we're already |
124 | ;; END; -- through with it. | |
e6b72410 KH |
125 | |
126 | ;; Pli bone ankora^u, vi povas pozici- Better yet, you can put the point | |
127 | ;; i^gi anta^u "This", tajpi M-3 f2 s before "This", type M-3 f2 s | |
128 | ;; kiu igas "-- " la separigilon inter which makes "-- " the separator | |
129 | ;; senkomentaria Ada bufro kaj nur- between a no-comments Ada buffer, | |
130 | ;; teksta komentaria bufro. Kiam vi and a plain text comment buffer. | |
131 | ;; denove kuni^gos ilin, ^ciu nevaka When you put them back together, | |
132 | ;; linio de l' dua kolumno denove every non-empty line of the 2nd | |
133 | ;; anta^uhavos "-- ". column will again be preceded by | |
134 | ;; "-- ". | |
135 | ||
72c0ae01 ER |
136 | |
137 | ;;; Code: | |
138 | \f | |
e6b72410 KH |
139 | |
140 | ;; Lucid patch | |
141 | (or (fboundp 'frame-width) | |
142 | (fset 'frame-width 'screen-width)) | |
143 | ||
144 | ||
3bcbd523 | 145 | ;;;;; Set up keymap ;;;;; |
72c0ae01 | 146 | |
e6b72410 KH |
147 | (defvar 2C-mode-map |
148 | (let ((map (make-sparse-keymap))) | |
149 | (define-key map "2" '2C-two-columns) | |
150 | (define-key map [f2] '2C-two-columns) | |
151 | (define-key map "b" '2C-associate-buffer) | |
152 | (define-key map "s" '2C-split) | |
e6b72410 KH |
153 | map) |
154 | "Keymap for commands for setting up two-column mode.") | |
155 | ||
156 | ||
157 | ||
158 | ;;;###autoload (autoload '2C-command "two-column" () t 'keymap) | |
159 | (fset '2C-command 2C-mode-map) | |
72c0ae01 | 160 | |
3bcbd523 | 161 | ;;;###autoload |
e6b72410 KH |
162 | ;; This one is for historical reasons and simple keyboards, it is not |
163 | ;; at all mnemonic. All usual sequences containing 2 were used, and | |
164 | ;; f2 could not be set up in a standard way under Emacs 18. | |
165 | (global-set-key "\C-x6" '2C-command) | |
166 | ||
72c0ae01 | 167 | |
3bcbd523 | 168 | ;;;###autoload |
e6b72410 KH |
169 | (global-set-key [f2] '2C-command) |
170 | ||
171 | ||
172 | (defvar 2C-minor-mode-map | |
173 | (let ((map (make-sparse-keymap))) | |
174 | (define-key map "1" '2C-merge) | |
175 | (define-key map "d" '2C-dissociate) | |
176 | (define-key map "o" '2C-associated-buffer) | |
8fe9ecef | 177 | (define-key map "\^m" '2C-newline) |
e6b72410 | 178 | (define-key map "|" '2C-toggle-autoscroll) |
30a7d33c KH |
179 | (define-key map "{" '2C-shrink-window-horizontally) |
180 | (define-key map "}" '2C-enlarge-window-horizontally) | |
e6b72410 KH |
181 | map) |
182 | "Keymap for commands for use in two-column mode.") | |
183 | ||
184 | ||
185 | (setq minor-mode-map-alist | |
186 | (cons (cons '2C-mode | |
187 | (let ((map (make-sparse-keymap))) | |
188 | (substitute-key-definition '2C-command 2C-minor-mode-map | |
189 | map (current-global-map)) | |
30a7d33c KH |
190 | (substitute-key-definition 'enlarge-window-horizontally |
191 | '2C-enlarge-window-horizontally | |
192 | map (current-global-map)) | |
193 | (substitute-key-definition 'shrink-window-horizontally | |
194 | '2C-shrink-window-horizontally | |
195 | map (current-global-map)) | |
e6b72410 KH |
196 | map)) |
197 | minor-mode-map-alist)) | |
3bcbd523 RS |
198 | \f |
199 | ;;;;; variable declarations ;;;;; | |
72c0ae01 | 200 | |
e6b72410 KH |
201 | ;; Markers seem to be the only buffer-id not affected by renaming a buffer. |
202 | ;; This nevertheless loses when a buffer is killed. The variable-name is | |
203 | ;; required by `describe-mode'. | |
204 | (defvar 2C-mode nil | |
72c0ae01 | 205 | "Marker to the associated buffer, if non-nil.") |
e6b72410 KH |
206 | (make-variable-buffer-local '2C-mode) |
207 | (put '2C-mode 'permanent-local t) | |
208 | ||
209 | ||
210 | ||
211 | (setq minor-mode-alist (cons '(2C-mode " 2C") minor-mode-alist)) | |
212 | ||
72c0ae01 | 213 | |
72c0ae01 ER |
214 | |
215 | ;; rearranged, so that the pertinent info will show in 40 columns | |
e6b72410 | 216 | (defvar 2C-mode-line-format |
72c0ae01 | 217 | '("-%*- %15b --" (-3 . "%p") "--%[(" mode-name |
e6b72410 | 218 | minor-mode-alist "%n" mode-line-process ")%]%-") |
72c0ae01 ER |
219 | "*Value of mode-line-format for a buffer in two-column minor mode.") |
220 | ||
e6b72410 KH |
221 | |
222 | (defvar 2C-other-buffer-hook 'text-mode | |
223 | "*Hook run in new buffer when it is associated with current one.") | |
224 | ||
225 | ||
226 | (defvar 2C-separator "" | |
72c0ae01 | 227 | "*A string inserted between the two columns when merging. |
e6b72410 KH |
228 | This gets set locally by \\[2C-split].") |
229 | (put '2C-separator 'permanent-local t) | |
230 | ||
231 | ||
72c0ae01 | 232 | |
e6b72410 | 233 | (defvar 2C-window-width 40 |
72c0ae01 ER |
234 | "*The width of the first column. (Must be at least `window-min-width') |
235 | This value is local for every buffer that sets it.") | |
e6b72410 KH |
236 | (make-variable-buffer-local '2C-window-width) |
237 | (put '2C-window-width 'permanent-local t) | |
72c0ae01 | 238 | |
e6b72410 KH |
239 | |
240 | ||
241 | (defvar 2C-beyond-fill-column 4 | |
72c0ae01 | 242 | "*Base for calculating `fill-column' for a buffer in two-column minor mode. |
e6b72410 | 243 | The value of `fill-column' becomes `2C-window-width' for this buffer |
72c0ae01 ER |
244 | minus this value.") |
245 | ||
e6b72410 KH |
246 | |
247 | ||
248 | (defvar 2C-autoscroll t | |
8fe9ecef | 249 | "If non-nil, Emacs attempts to keep the two column's buffers aligned.") |
e6b72410 KH |
250 | |
251 | ||
252 | ||
253 | (defvar 2C-autoscroll-start nil) | |
254 | (make-variable-buffer-local '2C-autoscroll-start) | |
72c0ae01 ER |
255 | \f |
256 | ;;;;; base functions ;;;;; | |
257 | ||
e6b72410 | 258 | ;; The access method for the other buffer. This tries to remedy against |
72c0ae01 | 259 | ;; lost local variables and lost buffers. |
8fe9ecef KH |
260 | (defun 2C-other (&optional req) |
261 | (or (if 2C-mode | |
262 | (or (prog1 | |
263 | (marker-buffer 2C-mode) | |
264 | (setq mode-line-format 2C-mode-line-format)) | |
265 | ;; The associated buffer somehow got killed. | |
266 | (progn | |
267 | ;; The other variables may later be useful if the user | |
268 | ;; reestablishes the association. | |
269 | (kill-local-variable '2C-mode) | |
270 | (kill-local-variable 'mode-line-format) | |
271 | nil))) | |
272 | (if req (error "You must first set two-column minor mode.")))) | |
72c0ae01 | 273 | |
72c0ae01 | 274 | |
72c0ae01 | 275 | |
e6b72410 KH |
276 | ;; function for setting up two-column minor mode in a buffer associated |
277 | ;; with the buffer pointed to by the marker other. | |
278 | (defun 2C-mode (other) | |
279 | "Minor mode for independently editing two columns. | |
280 | This is set up for two associated buffers by the three commands bound | |
281 | to \\[2C-two-columns] , \\[2C-associate-buffer] and \\[2C-split]. | |
282 | Turning on two-column mode calls the value of the variable `2C-mode-hook', | |
283 | if that value is non-nil. | |
284 | ||
285 | These buffers can be edited separately, for example with `fill-paragraph'. | |
286 | If you want to disable parallel scrolling temporarily, use \\[2C-toggle-autoscroll] . | |
72c0ae01 ER |
287 | |
288 | If you include long lines, i.e which will span both columns (eg. | |
289 | source code), they should be in what will be the first column, with | |
290 | the associated buffer having empty lines next to them. | |
291 | ||
e6b72410 KH |
292 | Potential uses are writing bilingual texts, or editing the comments of a |
293 | source code. See the file lisp/two-column.el for detailed examples. | |
294 | ||
72c0ae01 ER |
295 | You have the following commands at your disposal: |
296 | ||
e6b72410 KH |
297 | \\[2C-two-columns] Rearrange screen with current buffer first |
298 | \\[2C-associate-buffer] Reassociate buffer after changing major mode | |
72c0ae01 | 299 | \\[shrink-window-horizontally], \\[enlarge-window-horizontally] Shrink, enlarge current column |
8fe9ecef KH |
300 | \\[2C-associated-buffer] Switch to associated buffer at same point |
301 | \\[2C-newline] Insert newline(s) in both buffers at same point | |
e6b72410 KH |
302 | \\[2C-merge] Merge both buffers |
303 | \\[2C-dissociate] Dissociate the two buffers | |
72c0ae01 | 304 | |
e6b72410 KH |
305 | These keybindings can be customized in your ~/.emacs by `2C-mode-map', |
306 | `2C-minor-mode-map' and by binding `2C-command' to some prefix. | |
72c0ae01 ER |
307 | |
308 | The appearance of the screen can be customized by the variables | |
e6b72410 KH |
309 | `2C-window-width', `2C-beyond-fill-column', `2C-mode-line-format' and |
310 | `truncate-partial-width-windows'." | |
5181be3a RS |
311 | (make-local-hook 'post-command-hook) |
312 | (add-hook 'post-command-hook '2C-autoscroll nil t) | |
e6b72410 KH |
313 | (setq fill-column (- 2C-window-width |
314 | 2C-beyond-fill-column) | |
e6b72410 KH |
315 | mode-line-format 2C-mode-line-format |
316 | 2C-mode other) | |
317 | (run-hooks '2C-mode-hook)) | |
318 | ||
319 | ||
72c0ae01 | 320 | |
e6b72410 KH |
321 | ;;;###autoload |
322 | (defun 2C-two-columns (&optional buffer) | |
323 | "Split current window vertically for two-column editing. | |
324 | When called the first time, associates a buffer with the current | |
325 | buffer in two-column minor mode (see \\[describe-mode] ). | |
326 | Runs `2C-other-buffer-hook' in the new buffer. | |
327 | When called again, restores the screen layout with the current buffer | |
328 | first and the associated buffer to it's right." | |
72c0ae01 | 329 | (interactive "P") |
e6b72410 | 330 | ;; first go to full width, so that we can certainly split into two windows |
3bcbd523 | 331 | (if (< (window-width) (frame-width)) |
72c0ae01 ER |
332 | (enlarge-window 99999 t)) |
333 | (split-window-horizontally | |
e6b72410 | 334 | (max window-min-width (min 2C-window-width |
3bcbd523 | 335 | (- (frame-width) window-min-width)))) |
e6b72410 | 336 | (if (2C-other) |
72c0ae01 ER |
337 | (progn |
338 | (other-window 1) | |
e6b72410 | 339 | (switch-to-buffer (2C-other)) |
72c0ae01 | 340 | (other-window -1) |
e6b72410 KH |
341 | (if 2C-autoscroll |
342 | (2C-toggle-autoscroll t))) | |
343 | ||
344 | (2C-mode (prog1 (point-marker) | |
345 | (other-window 1) | |
346 | (switch-to-buffer | |
347 | (or buffer | |
8fe9ecef | 348 | (generate-new-buffer (concat "2C/" (buffer-name))))) |
e6b72410 KH |
349 | (or buffer |
350 | (run-hooks '2C-other-buffer-hook)))) | |
351 | ||
352 | (2C-mode (prog1 (point-marker) | |
353 | (other-window -1))))) | |
354 | ||
355 | ||
72c0ae01 | 356 | |
6f5191a2 | 357 | ;;;###autoload |
e6b72410 | 358 | (defun 2C-associate-buffer () |
72c0ae01 ER |
359 | "Associate another buffer with this one in two-column minor mode. |
360 | Can also be used to associate a just previously visited file, by | |
361 | accepting the proposed default buffer. | |
362 | ||
e6b72410 | 363 | \(See \\[describe-mode] .)" |
72c0ae01 ER |
364 | (interactive) |
365 | (let ((b1 (current-buffer)) | |
e6b72410 | 366 | (b2 (or (2C-other) |
72c0ae01 ER |
367 | (read-buffer "Associate buffer: " (other-buffer))))) |
368 | (save-excursion | |
e6b72410 | 369 | (setq 2C-mode nil) |
72c0ae01 | 370 | (set-buffer b2) |
e6b72410 KH |
371 | (and (2C-other) |
372 | (not (eq b1 (2C-other))) | |
72c0ae01 | 373 | (error "Buffer already associated with buffer `%s'." |
e6b72410 KH |
374 | (buffer-name (2C-other)))) |
375 | (setq b1 (and (assq '2C-window-width (buffer-local-variables)) | |
376 | 2C-window-width))) | |
72c0ae01 | 377 | ; if other buffer has a local width, adjust here too |
e6b72410 KH |
378 | (if b1 (setq 2C-window-width (- (frame-width) b1))) |
379 | (2C-two-columns b2))) | |
380 | ||
381 | ||
72c0ae01 | 382 | |
6f5191a2 | 383 | ;;;###autoload |
e6b72410 KH |
384 | (defun 2C-split (arg) |
385 | "Split a two-column text at point, into two buffers in two-column minor mode. | |
386 | Point becomes the local value of `2C-window-width'. Only lines that | |
387 | have the ARG same preceding characters at that column get split. The | |
388 | ARG preceding characters without any leading whitespace become the local | |
389 | value for `2C-separator'. This way lines that continue across both | |
72c0ae01 ER |
390 | columns remain untouched in the first buffer. |
391 | ||
e6b72410 KH |
392 | This function can be used with a prototype line, to set up things. You |
393 | write the first line of each column and then split that line. E.g.: | |
72c0ae01 | 394 | |
e6b72410 | 395 | First column's text sSs Second column's text |
72c0ae01 ER |
396 | \\___/\\ |
397 | / \\ | |
e6b72410 | 398 | 5 character Separator You type M-5 \\[2C-split] with the point here. |
72c0ae01 | 399 | |
e6b72410 KH |
400 | \(See \\[describe-mode] .)" |
401 | (interactive "*p") | |
402 | (and (2C-other) | |
72c0ae01 | 403 | (if (y-or-n-p (concat "Overwrite associated buffer `" |
e6b72410 | 404 | (buffer-name (2C-other)) |
72c0ae01 ER |
405 | "'? ")) |
406 | (save-excursion | |
e6b72410 | 407 | (set-buffer (2C-other)) |
72c0ae01 ER |
408 | (erase-buffer)) |
409 | (signal 'quit nil))) | |
410 | (let ((point (point)) | |
411 | ; make next-line always come back to same column | |
412 | (goal-column (current-column)) | |
413 | ; a counter for empty lines in other buffer | |
414 | (n (1- (count-lines (point-min) (point)))) | |
415 | chars other) | |
416 | (save-excursion | |
417 | (backward-char arg) | |
418 | (setq chars (buffer-substring (point) point)) | |
419 | (skip-chars-forward " \t" point) | |
e6b72410 KH |
420 | (make-local-variable '2C-separator) |
421 | (setq 2C-separator (buffer-substring (point) point) | |
422 | 2C-window-width (current-column))) | |
423 | (2C-two-columns) | |
424 | (setq other (2C-other)) | |
425 | ; now we're ready to actually split | |
72c0ae01 ER |
426 | (save-excursion |
427 | (while (not (eobp)) | |
428 | (if (not (and (= (current-column) goal-column) | |
429 | (string= chars | |
430 | (buffer-substring (point) | |
431 | (save-excursion | |
432 | (backward-char arg) | |
433 | (point)))))) | |
434 | (setq n (1+ n)) | |
435 | (setq point (point)) | |
436 | (backward-char arg) | |
437 | (skip-chars-backward " \t") | |
438 | (delete-region point (point)) | |
439 | (setq point (point)) | |
440 | (insert-char ?\n n) | |
441 | (append-to-buffer other point (progn (end-of-line) | |
442 | (if (eobp) | |
443 | (point) | |
444 | (1+ (point))))) | |
445 | (delete-region point (point)) | |
446 | (setq n 0)) | |
447 | (next-line 1))))) | |
448 | ||
e6b72410 KH |
449 | |
450 | ||
451 | ||
452 | (defun 2C-dissociate () | |
72c0ae01 ER |
453 | "Turn off two-column minor mode in current and associated buffer. |
454 | If the associated buffer is unmodified and empty, it is killed." | |
455 | (interactive) | |
456 | (let ((buffer (current-buffer))) | |
457 | (save-excursion | |
e6b72410 KH |
458 | (and (2C-other) |
459 | (set-buffer (2C-other)) | |
460 | (or (not (2C-other)) | |
461 | (eq buffer (2C-other))) | |
72c0ae01 ER |
462 | (if (and (not (buffer-modified-p)) |
463 | (eobp) (bobp)) | |
464 | (kill-buffer nil) | |
e6b72410 KH |
465 | (kill-local-variable '2C-mode) |
466 | (kill-local-variable '2C-window-width) | |
467 | (kill-local-variable '2C-separator) | |
72c0ae01 ER |
468 | (kill-local-variable 'mode-line-format) |
469 | (kill-local-variable 'fill-column)))) | |
e6b72410 KH |
470 | (kill-local-variable '2C-mode) |
471 | (kill-local-variable '2C-window-width) | |
472 | (kill-local-variable '2C-separator) | |
72c0ae01 ER |
473 | (kill-local-variable 'mode-line-format) |
474 | (kill-local-variable 'fill-column))) | |
475 | ||
476 | ||
e6b72410 | 477 | |
72c0ae01 ER |
478 | ;; this doesn't use yank-rectangle, so that the first column can |
479 | ;; contain long lines | |
e6b72410 | 480 | (defun 2C-merge () |
72c0ae01 | 481 | "Merges the associated buffer with the current buffer. |
e6b72410 KH |
482 | They get merged at the column, which is the value of `2C-window-width', |
483 | i.e. usually at the vertical window separator. This separator gets | |
484 | replaced with white space. Beyond that the value of `2C-separator' gets | |
485 | inserted on merged lines. The two columns are thus pasted side by side, | |
486 | in a single text. If the other buffer is not displayed to the left of | |
487 | this one, then this one becomes the left column. | |
488 | ||
489 | If you want `2C-separator' on empty lines in the second column, | |
72c0ae01 ER |
490 | you should put just one space in them. In the final result, you can strip |
491 | off trailing spaces with \\[beginning-of-buffer] \\[replace-regexp] [ SPC TAB ] + $ RET RET" | |
72c0ae01 | 492 | (interactive) |
72c0ae01 ER |
493 | (and (> (car (window-edges)) 0) ; not touching left edge of screen |
494 | (eq (window-buffer (previous-window)) | |
8fe9ecef | 495 | (2C-other t)) |
72c0ae01 ER |
496 | (other-window -1)) |
497 | (save-excursion | |
498 | (let ((b1 (current-buffer)) | |
8fe9ecef | 499 | (b2 (2C-other t)) |
72c0ae01 ER |
500 | string) |
501 | (goto-char (point-min)) | |
502 | (set-buffer b2) | |
503 | (goto-char (point-min)) | |
504 | (while (not (eobp)) | |
505 | (setq string (buffer-substring (point) | |
506 | (progn (end-of-line) (point)))) | |
507 | (or (eobp) | |
508 | (forward-char)) ; next line | |
509 | (set-buffer b1) | |
510 | (if (string= string "") | |
511 | () | |
512 | (end-of-line) | |
e6b72410 KH |
513 | (indent-to-column 2C-window-width) |
514 | (insert 2C-separator string)) | |
72c0ae01 ER |
515 | (next-line 1) ; add one if necessary |
516 | (set-buffer b2)))) | |
3bcbd523 | 517 | (if (< (window-width) (frame-width)) |
72c0ae01 ER |
518 | (enlarge-window 99999 t))) |
519 | \f | |
520 | ;;;;; utility functions ;;;;; | |
521 | ||
e6b72410 | 522 | (defun 2C-associated-buffer () |
72c0ae01 ER |
523 | "Switch to associated buffer." |
524 | (interactive) | |
8fe9ecef KH |
525 | (let ((line (+ (count-lines (point-min) (point)) |
526 | (if (bolp) 1 0))) | |
527 | (col (if (eolp) (if (bolp) 0) (current-column)))) | |
528 | (if (get-buffer-window (2C-other t)) | |
529 | (select-window (get-buffer-window (2C-other))) | |
530 | (switch-to-buffer (2C-other))) | |
531 | (newline (goto-line line)) | |
532 | (if col | |
533 | (move-to-column col) | |
534 | (end-of-line 1)))) | |
535 | ||
536 | (defun 2C-newline (arg) | |
537 | "Insert ARG newlines in both buffers." | |
538 | (interactive "P") | |
539 | (save-window-excursion | |
540 | (2C-associated-buffer) | |
541 | (newline arg)) | |
542 | (newline arg)) | |
72c0ae01 | 543 | |
e6b72410 KH |
544 | (defun 2C-toggle-autoscroll (arg) |
545 | "Toggle autoscrolling, or set it iff prefix ARG is non-nil and positive. | |
546 | When autoscrolling is turned on, this also realigns the two buffers." | |
72c0ae01 | 547 | (interactive "P") |
8fe9ecef | 548 | ;(sit-for 0) |
e6b72410 KH |
549 | (setq 2C-autoscroll-start (window-start)) |
550 | (if (setq 2C-autoscroll (if arg | |
551 | (>= (prefix-numeric-value arg) 0) | |
552 | (not 2C-autoscroll))) | |
553 | (select-window | |
554 | (prog1 (selected-window) | |
555 | (message "Autoscrolling is on.") | |
e6b72410 | 556 | (setq arg (count-lines (point-min) (window-start))) |
8fe9ecef | 557 | (if (get-buffer-window (2C-other t)) |
e6b72410 KH |
558 | (progn |
559 | (select-window (get-buffer-window (2C-other))) | |
560 | (setq arg (- arg (count-lines (point-min) (window-start)))) | |
561 | ;; make sure that other buffer has enough lines | |
562 | (save-excursion | |
563 | (insert-char ?\n | |
564 | (- arg (count-lines (window-start) | |
565 | (goto-char (point-max))) | |
566 | -1))) | |
567 | (scroll-up arg))))) | |
568 | (message "Autoscrolling is off."))) | |
569 | ||
570 | ||
571 | ||
572 | (defun 2C-autoscroll () | |
573 | (if 2C-autoscroll | |
574 | ;; catch a mouse scroll on non-selected scrollbar | |
575 | (select-window | |
576 | (prog1 (selected-window) | |
577 | (and (consp last-command-char) | |
578 | (not (eq (selected-window) | |
579 | (car (car (cdr last-command-char))))) | |
580 | (select-window (car (car (cdr last-command-char))))) | |
581 | ;; In some cases scrolling causes an error, but post-command-hook | |
582 | ;; shouldn't, and should always stay in the original window | |
583 | (condition-case () | |
584 | (and (or 2C-autoscroll-start (2C-toggle-autoscroll t) nil) | |
585 | (/= (window-start) 2C-autoscroll-start) | |
586 | (2C-other) | |
587 | (get-buffer-window (2C-other)) | |
588 | (let ((lines (count-lines (window-start) | |
589 | 2C-autoscroll-start))) | |
590 | (if (< (window-start) 2C-autoscroll-start) | |
591 | (setq lines (- lines))) | |
592 | (setq 2C-autoscroll-start (window-start)) | |
593 | (select-window (get-buffer-window (2C-other))) | |
594 | ;; make sure that other buffer has enough lines | |
595 | (save-excursion | |
596 | (insert-char | |
597 | ?\n (- lines (count-lines (window-start) | |
598 | (goto-char (point-max))) | |
599 | -1))) | |
600 | (scroll-up lines) | |
601 | (setq 2C-autoscroll-start (window-start)))) | |
602 | (error)))))) | |
603 | ||
604 | ||
72c0ae01 | 605 | |
30a7d33c | 606 | (defun 2C-enlarge-window-horizontally (arg) |
72c0ae01 ER |
607 | "Make current window ARG columns wider." |
608 | (interactive "p") | |
609 | (enlarge-window arg t) | |
e6b72410 KH |
610 | (and (2C-other) |
611 | (setq 2C-window-width (+ 2C-window-width arg)) | |
612 | (set-buffer (2C-other)) | |
613 | (setq 2C-window-width (- 2C-window-width arg)))) | |
72c0ae01 | 614 | |
30a7d33c | 615 | (defun 2C-shrink-window-horizontally (arg) |
72c0ae01 ER |
616 | "Make current window ARG columns narrower." |
617 | (interactive "p") | |
30a7d33c | 618 | (2C-enlarge-window-horizontally (- arg))) |
72c0ae01 | 619 | |
e6b72410 KH |
620 | |
621 | ||
3bcbd523 RS |
622 | (provide 'two-column) |
623 | ||
72c0ae01 | 624 | ;;; two-column.el ends here |