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72c0ae01 ER |
1 | ;;; two-column.el --- minor mode for editing of two-column text |
2 | ||
eea8d4ef ER |
3 | ;; Copyright (C) 1992 Free Software Foundation, Inc. |
4 | ||
72c0ae01 | 5 | ;; Author: Daniel Pfeiffer <pfeiffer@cix.cict.fr> |
72c0ae01 ER |
6 | ;; Adapted-By: ESR |
7 | ||
72c0ae01 ER |
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 | |
12 | ;; the Free Software Foundation; either version 1, or (at your option) | |
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 | ||
24 | ;;; Commentary: | |
25 | ||
26 | ;; --8<---- two-column.el ----8<--------8<--------8<--------8<--------8<------- | |
27 | ;; Esperanto: English: | |
28 | ||
29 | ;; Minora modalo por samtempa dukolumna Minor mode for simultaneous | |
30 | ;; tajpado two-column editing | |
31 | ||
32 | ;; ^Ci dataro estas ero de GNU Emacs. This file is part of GNU Emacs. | |
33 | ||
34 | ;; GNU Emacs estas disdonata en la GNU Emacs is distributed in the hope | |
35 | ;; espero ke ^gi estos utila, sed SEN that it will be useful, but WITHOUT | |
36 | ;; IA GARANTIO. Neniu a^utoro a^u ANY WARRANTY. No author or | |
37 | ;; disdonanto akceptas respondecon al distributor accepts responsibility | |
38 | ;; iu ajn por la sekvoj de ^gia uzado, to anyone for the consequences of | |
39 | ;; a^u ^cu ^gi serveblas al iu celo, using it or for whether it serves | |
40 | ;; a^u e^c entute funkcias, se li ni any particular purpose or works at | |
41 | ;; estas skribinta tion. Vidu la GNU all, unless he says so in writing. | |
42 | ;; Emacs ^Generala Publika Licenco por Refer to the GNU Emacs General | |
43 | ;; plenaj detaloj. Public License for full details. | |
44 | ||
45 | ;; ^Ciu rajtas kopii, modifi kaj ree Everyone is granted permission to | |
46 | ;; disdoni GNU Emacs, sed nur sub la copy, modify and redistribute GNU | |
47 | ;; condi^coj priskribitaj en la GNU Emacs, but only under the conditions | |
48 | ;; Emacs ^Generala Publika Licenco. described in the GNU Emacs General | |
49 | ;; Kopio de tiu licenso estas supozata Public License. A copy of this | |
50 | ;; donita al vi kune kun GNU Emacs, por license is supposed to have been | |
51 | ;; ke vi sciu viajn rajtojn kaj given to you along with GNU Emacs so | |
52 | ;; respondecojn. ^Gi devus esti en you can know your rights and | |
53 | ;; dataro nomata COPYING. Inter responsibilities. It should be in a | |
54 | ;; alia^joj, la notico pri kopirajto file named COPYING. Among other | |
55 | ;; kaj ^ci notico devas esti gardata things, the copyright notice and | |
56 | ;; sur ^ciuj kopioj. this notice must be preserved on all | |
57 | ;; copies. | |
58 | ||
59 | ||
60 | ;; Tiu minora modalo ebligas al vi This minor mode allows you to | |
61 | ;; tajpi sendepende en du apudaj independently edit two adjacent | |
62 | ;; bufroj. Vi havas tri eblecojn por buffers. You have three ways to | |
63 | ;; eki ^gin. ^Ciu donas al vi start it up. Each gives you a | |
64 | ;; horizontale disigatan fenestron, horizontally split window similar to | |
65 | ;; simila al fina apareco de via the final outcome of your text: | |
66 | ;; teksto: | |
67 | ||
68 | ;; C-x 6 2 asocias novan bufron nomatan associates a new buffer called | |
69 | ;; same, sed kun 2C/ anta^u. the same, but with 2C/ | |
70 | ;; prepended. | |
71 | ||
72 | ;; C-x 6 b asocias alian bufron. Vi povas associates another buffer. | |
73 | ;; anka^u asocii dataron, se vi This can be used to associate a | |
74 | ;; ^jus anta^ue faris C-x C-f. file if you just did C-x C-f. | |
75 | ||
76 | ;; C-x 6 u disigas jam dukolumnan tekston unmerges a two-column text into | |
77 | ;; en du bufroj ekde la nuna two buffers from the current | |
78 | ;; linio, kaj je la nuna kolumno. line and at the current column. | |
79 | ;; La anta^uaj signoj (ofte The preceding characters (often | |
80 | ;; tabeligilo a^u |) estas la tab or |) are the column | |
81 | ;; kolumna disiganto. Linioj kiuj separator. Lines that don't | |
82 | ;; ne enhavas ilin ne estas have them won't be separated. | |
83 | ;; disigitaj. Kiel la kvara kaj Like the fourth and fifth line | |
84 | ;; la kvina linio se vi disigas if you unmerge this file from | |
85 | ;; ^ci dataron ekde la unua angla the first english word. | |
86 | ;; vorto. | |
87 | ||
88 | ;; Je ^cia flanko estas bufro, kiu On each side is a buffer that knows | |
89 | ;; konas la alian. Kun la ordonoj C-x about the other. With the commands | |
90 | ;; 6 SPC, C-x 6 DEL kaj C-x 6 RET oni C-x 6 SPC, C-x 6 DEL and C-x 6 RET | |
91 | ;; povas suben- a^u supreniri unu you can simultaneously scroll up or | |
92 | ;; ekranon, kaj subeniri linion, down by a screenfull and by a line | |
93 | ;; samtempe en la du bufroj. Al la alia in both buffers. Empty lines are | |
94 | ;; bufro estas aldonataj linioj se added to the other buffer if | |
95 | ;; necesas, por ke vi vidu la saman necessary, so that you see the same | |
96 | ;; parton. Per C-x 6 C-l vi povas part. With C-x 6 C-l you can | |
97 | ;; recentrigi la linion. Kiam vi nur recenter the line. When you only | |
98 | ;; plu havas unu el la du bufroj have one of the two buffers onscreen | |
99 | ;; surekrane vi revidos la alian per you can get the other back with C-x | |
100 | ;; denove C-x 6 2. 6 2 once more. | |
101 | ||
102 | ;; Se vi volas meti longajn liniojn If you include long lines, i.e which | |
103 | ;; (ekz. programerojn) en la kunigotan will span both columns (eg. source | |
104 | ;; tekston, ili devas esti en la code), they should be in what will | |
105 | ;; estonte unua kolumno. La alia devas be the first column, with the | |
106 | ;; havi malplenajn linion apud ili. associated buffer having empty lines | |
107 | ;; next to them. | |
108 | ||
109 | ;; Averto: en Emacs kiam vi ^san^gas la Attention: in Emacs when you change | |
110 | ;; ma^joran modalon, la minoraj modaloj the major mode, the minor modes are | |
111 | ;; estas anka^u elmemorigitaj. Tiu- also purged from memory. In that | |
112 | ;; okaze vi devas religi la du bufrojn case you must reassociate the two | |
113 | ;; per iu C-x 6-ordono, ekz. C-x 6 b. buffers with any C-x 6-command, e.g. | |
114 | ;; C-x 6 b. | |
115 | ||
116 | ;; Kiam vi estos kontenta de la When you have edited both buffers to | |
117 | ;; rezulto, vi kunmetos la du kolumnojn your content, you merge them with | |
118 | ;; per C-x 6 1. Se vi poste vidas C-x 6 1. If you then see a problem, | |
119 | ;; problemon, vi neniigu la kunmeton you undo the merge with C-x u and | |
120 | ;; per C-x u kaj plue modifu la du continue to edit the two buffers. | |
121 | ;; bufrojn. Kiam vi ne plu volas tajpi When you no longer want to edit in | |
122 | ;; dukolumne, vi eliru el la minora two columns, you turn off the minor | |
123 | ;; modalo per C-x 6 k. mode with C-x 6 k. | |
124 | ||
125 | ||
126 | ;; An^stata^u tri `autoload' kaj tri | Instead of three `autoload' and | |
127 | ;; `global-set-key' vi povas uzi la | three `global-set-key' you can use | |
128 | ;; jenon en via dataro ~/.emacs, por | the following in your file | |
129 | ;; memstare ^car^gi la modalon: | ~/.emacs, to automatically load | |
130 | ;; | the mode: | |
131 | ||
132 | ;; (global-set-key "\C-x6" | |
133 | ;; '(lambda () (interactive) | |
134 | ;; (load-library "two-column") | |
135 | ;; (call-interactively | |
136 | ;; (cdr (assq (read-char) tc-mode-map))))) | |
137 | ||
138 | ;; Se vi ^satus havi la dukolumnajn | If you'd like to have the | |
139 | ;; ordonojn je funkciklavo <f2>, vi | two-column commands on function | |
140 | ;; povas uzi la jenon en via dataro | key <f2>, you can use the | |
141 | ;; ~/.emacs: | following in your file ~/.emacs: | |
142 | ||
143 | ;; (define-key function-keymap "\^b" | |
144 | ;; '(lambda () (interactive) | |
145 | ;; (load-library "two-column") | |
146 | ;; (define-key function-keymap "\^b" tc-mode-map) | |
147 | ;; (call-interactively | |
148 | ;; (cdr (assq (read-char) tc-mode-map))))) | |
149 | ||
150 | ;; In addition to two-column editing of text, for example for writing a | |
151 | ;; bilingual text side-by-side as shown below in the file's prolog, other | |
152 | ;; interesting uses have been found for this minor mode: | |
153 | ;; | |
154 | ;; | |
155 | ;; You can separate the columns with {+} C-x 6 u or <f2> u if you prefer | |
156 | ;; any string that pleases you, by {+} handles these with a prefix argument | |
157 | ;; setting tc-separator. For {+} that enables you to declare the | |
158 | ;; example "{+} " if you like to {+} desired length of such a string. | |
159 | ;; amuse yourself. | |
160 | ;; | |
161 | ;; | |
162 | ;; keyword You can write any text corresponding to a | |
163 | ;; given keyword in a filled paragraph next to | |
164 | ;; it. Note that the width of the first column | |
165 | ;; may be less than window-min-width in the | |
166 | ;; result, but will be displayed at that width. | |
167 | ;; | |
168 | ;; another This is not a three- or multi-column mode. | |
169 | ;; The example in the file's prolog required | |
170 | ;; working on two columns and then treating the | |
171 | ;; result as one column in order to add the | |
172 | ;; third. | |
173 | ;; | |
174 | ;; | |
175 | ;; Programmers might like the ability to split off the comment column of | |
176 | ;; a file that looks like the following. The advantage is that with | |
177 | ;; (setq fill-prefix "-- ") you can run M-q (fill-paragraph) on the | |
178 | ;; comment. The problem is, code quickly gets rather wide, so you need | |
179 | ;; to use a narrower comment column, which is less interesting, unless | |
180 | ;; you have a 132-column screen. Code lines that reach beyond | |
181 | ;; comment-column are no problem, except that you won't always see their | |
182 | ;; end during editing. | |
183 | ;; | |
184 | ;; BEGIN -- This is just some meaningless | |
185 | ;; FOR i IN 1..10 LOOP -- code in Ada, that runs foobar | |
186 | ;; foobar( i ); -- once for each argument from one | |
187 | ;; END LOOP; -- to ten, and then we're already | |
188 | ;; END; -- through with it. | |
189 | ;; | |
190 | ;; Better yet, you can put the point before "This", type M-3 C-x 6 u | |
191 | ;; which makes "-- " the separator between a no-comments Ada buffer, and | |
192 | ;; a plain text comment buffer. When you put them back together, every | |
193 | ;; non-empty line of the 2nd column will again be preceded by "-- ". | |
194 | ;; | |
195 | ;; | |
196 | ;; The <f2> function key hack (which is one of the rare times when | |
197 | ;; function keys are mnemonic) at the end of the file's prolog requires | |
198 | ;; that the lisp/term/*.el for your terminal use the standard | |
199 | ;; conventions. Too bad that some don't (at least not in version 18.55). | |
200 | ;; The Sun one is hopelessly non-standard, and vt2[024]0 somehow forgot | |
201 | ;; to define <f1> thru <f5>. (It defines <pf1> thru <pf4> instead, but | |
202 | ;; that is not what we need on an X terminal.) If you want to use those, | |
203 | ;; you'll need another hack something like: | |
204 | ;; | |
205 | ;; (if (string= (system-name) "cix") | |
206 | ;; (progn | |
207 | ;; (load-library "term/vt200.el") | |
208 | ;; (define-key CSI-map "12~" (cons function-keymap ?\^b))) | |
209 | ;; (global-unset-key "\e[") | |
210 | ;; (define-key esc-map "[225z" (cons function-keymap ?\^b))) | |
211 | ;; | |
212 | ;; where "cix" is the non-sun machine I use. Actually I use the same X | |
213 | ;; terminal to connect to both machines, and I want to keep my ~/.emacs | |
214 | ;; identical on both. Bother, the two Emacses don't recognize the same | |
215 | ;; keys and assign different sequences to those they do! I sure hope all | |
216 | ;; this nonsense will stop with version 19 (or preferably soon) where I'd | |
217 | ;; like to be able to say (define-key some-map '<f2> some-cmd), and see | |
218 | ;; <f2> rather than some unintelligible ESC-sequence in command key | |
219 | ;; sequences. | |
220 | ||
221 | ;;; Code: | |
222 | \f | |
223 | ;;;;; variable declarations ;;;;; | |
224 | ||
225 | (provide 'two-column) | |
226 | ||
227 | (defvar tc-prefix "\C-x6" | |
228 | "Prefix tc-mode-map gets bound to. | |
229 | If you'd like to bind it to function key <f2>, see the prolog of the | |
230 | source file, lisp/two-column.el") | |
231 | ||
232 | (defvar tc-mode-map nil | |
233 | "Keymap that contains all commands useful with two-column minor mode. | |
234 | This gets bound globally to `tc-prefix' since minor modes have | |
235 | no local keymap.") | |
236 | ||
237 | (if tc-mode-map | |
238 | () | |
239 | (setq tc-mode-map (make-sparse-keymap)) | |
240 | (define-key tc-mode-map "1" 'tc-merge) | |
241 | (define-key tc-mode-map "2" 'tc-split) | |
242 | (define-key tc-mode-map "b" 'tc-associate-buffer) | |
243 | (define-key tc-mode-map "k" 'tc-kill-association) | |
244 | (define-key tc-mode-map "\C-l" 'tc-recenter) | |
245 | (define-key tc-mode-map "o" 'tc-associated-buffer) | |
246 | (define-key tc-mode-map "u" 'tc-unmerge) | |
247 | (define-key tc-mode-map "{" 'shrink-window-horizontally) | |
248 | (define-key tc-mode-map "}" 'enlarge-window-horizontally) | |
249 | (define-key tc-mode-map " " 'tc-scroll-up) | |
250 | (define-key tc-mode-map "\^?" 'tc-scroll-down) | |
251 | (define-key tc-mode-map "\C-m" 'tc-scroll-line)) | |
252 | ||
253 | (global-set-key tc-prefix tc-mode-map) | |
254 | ||
255 | ||
256 | ;; markers seem to be the only buffer-id not affected by renaming | |
257 | ;; a buffer. This nevertheless loses when a buffer is killed. | |
258 | (defvar tc-other nil | |
259 | "Marker to the associated buffer, if non-nil.") | |
260 | (make-variable-buffer-local 'tc-other) | |
261 | ||
262 | ||
263 | (defvar tc-buffer-list () | |
264 | "An alist of markers to associated buffers. (Backs up `tc-other')") | |
265 | ||
266 | (setq minor-mode-alist (cons '(tc-other " 2C") minor-mode-alist)) | |
267 | ||
268 | ;; rearranged, so that the pertinent info will show in 40 columns | |
269 | (defvar tc-mode-line-format | |
270 | '("-%*- %15b --" (-3 . "%p") "--%[(" mode-name | |
271 | minor-mode-alist "%n" mode-line-process ")%]%-") | |
272 | "*Value of mode-line-format for a buffer in two-column minor mode.") | |
273 | ||
274 | (defvar tc-separator "" | |
275 | "*A string inserted between the two columns when merging. | |
276 | This gets set locally by \\[tc-unmerge].") | |
277 | ||
278 | (defvar tc-window-width 40 | |
279 | "*The width of the first column. (Must be at least `window-min-width') | |
280 | This value is local for every buffer that sets it.") | |
281 | (make-variable-buffer-local 'tc-window-width) | |
282 | ||
283 | (defvar tc-beyond-fill-column 4 | |
284 | "*Base for calculating `fill-column' for a buffer in two-column minor mode. | |
285 | The value of `fill-column' becomes `tc-window-width' for this buffer | |
286 | minus this value.") | |
287 | ||
288 | (defvar tc-mode-hook nil | |
289 | "Function called, if non-nil, whenever turning on two-column minor mode. | |
290 | It can get called by \\[tc-split] (tc-split), \\[tc-unmerge] (tc-unmerge) | |
291 | and \\[tc-associate-buffer] (tc-associate-buffer), on both buffers.") | |
292 | \f | |
293 | ;;;;; base functions ;;;;; | |
294 | ||
295 | ;; the access method for the other buffer. this tries to remedy against | |
296 | ;; lost local variables and lost buffers. | |
297 | (defun tc-other () | |
298 | (if (or tc-other | |
299 | (setq tc-other | |
300 | ; assoc with a different predicate, since we don't know | |
301 | ; which marker points to this buffer | |
302 | (let ((bl tc-buffer-list)) | |
303 | (while (and bl (not (eq (current-buffer) | |
304 | (marker-buffer (car (car bl)))))) | |
305 | (setq bl (cdr bl))) | |
306 | (cdr (car bl))))) | |
307 | (or (prog1 | |
308 | (marker-buffer tc-other) | |
309 | (setq mode-line-format tc-mode-line-format )) | |
310 | ; The associated buffer somehow got killed. | |
311 | (progn | |
312 | ; The other variables may later be useful if the user | |
313 | ; reestablishes the association. | |
314 | (kill-local-variable 'tc-other) | |
315 | (kill-local-variable 'mode-line-format) | |
316 | nil)))) | |
317 | ||
318 | (defun tc-split (&optional buffer) | |
319 | "Split current window vertically for two-column editing. | |
320 | ||
321 | When called the first time, associates a buffer with the current | |
322 | buffer. Both buffers are put in two-column minor mode and | |
323 | tc-mode-hook gets called on both. These buffers remember | |
324 | about one another, even when renamed. | |
325 | ||
326 | When called again, restores the screen layout with the current buffer | |
327 | first and the associated buffer to it's right. | |
328 | ||
329 | If you include long lines, i.e which will span both columns (eg. | |
330 | source code), they should be in what will be the first column, with | |
331 | the associated buffer having empty lines next to them. | |
332 | ||
333 | You have the following commands at your disposal: | |
334 | ||
335 | \\[tc-split] Rearrange screen | |
336 | \\[tc-associate-buffer] Reassociate buffer after changing major mode | |
337 | \\[tc-scroll-up] Scroll both buffers up by a screenfull | |
338 | \\[tc-scroll-down] Scroll both buffers down by a screenful | |
339 | \\[tc-scroll-line] Scroll both buffers up by one or more lines | |
340 | \\[tc-recenter] Recenter and realign other buffer | |
341 | \\[shrink-window-horizontally], \\[enlarge-window-horizontally] Shrink, enlarge current column | |
342 | \\[tc-associated-buffer] Switch to associated buffer | |
343 | \\[tc-merge] Merge both buffers | |
344 | ||
345 | These keybindings can be customized in your ~/.emacs by `tc-prefix' | |
346 | and `tc-mode-map'. | |
347 | ||
348 | The appearance of the screen can be customized by the variables | |
349 | `tc-window-width', `tc-beyond-fill-column', | |
350 | `tc-mode-line-format' and `truncate-partial-width-windows'." | |
351 | ||
352 | (interactive "P") | |
353 | ; first go to full width, so that we can certainly split into | |
354 | ; two windows | |
355 | (if (< (window-width) (screen-width)) | |
356 | (enlarge-window 99999 t)) | |
357 | (split-window-horizontally | |
358 | (max window-min-width (min tc-window-width | |
359 | (- (screen-width) window-min-width)))) | |
360 | (if (tc-other) | |
361 | (progn | |
362 | (other-window 1) | |
363 | (switch-to-buffer (tc-other)) | |
364 | (other-window -1) | |
365 | ; align buffers if necessary | |
366 | (tc-scroll-line 0)) | |
367 | ||
368 | ; set up minor mode linking two buffers | |
369 | (setq fill-column (- tc-window-width | |
370 | tc-beyond-fill-column) | |
371 | mode-line-format tc-mode-line-format) | |
372 | (run-hooks tc-mode-hook) | |
373 | (let ((other (point-marker))) | |
374 | (other-window 1) | |
375 | (switch-to-buffer | |
376 | (or buffer | |
377 | (generate-new-buffer | |
378 | (concat "2C/" (buffer-name))))) | |
379 | (or buffer | |
380 | (text-mode)) | |
381 | (setq fill-column (- tc-window-width | |
382 | tc-beyond-fill-column) | |
383 | mode-line-format tc-mode-line-format | |
384 | tc-other other | |
385 | other (point-marker)) | |
386 | (setq tc-buffer-list (cons (cons tc-other other) | |
387 | tc-buffer-list)) | |
388 | (run-hooks tc-mode-hook) | |
389 | (other-window -1) | |
390 | (setq tc-buffer-list | |
391 | (cons (cons other | |
392 | (save-excursion | |
393 | (set-buffer (tc-other)) | |
394 | tc-other)) | |
395 | tc-buffer-list)) | |
396 | (setq tc-other other)))) | |
397 | ||
398 | (fset 'tc-mode 'tc-split) | |
399 | ||
400 | (defun tc-associate-buffer () | |
401 | "Associate another buffer with this one in two-column minor mode. | |
402 | Can also be used to associate a just previously visited file, by | |
403 | accepting the proposed default buffer. | |
404 | ||
405 | See \\[tc-split] and `lisp/two-column.el' for further details." | |
406 | (interactive) | |
407 | (let ((b1 (current-buffer)) | |
408 | (b2 (or (tc-other) | |
409 | (read-buffer "Associate buffer: " (other-buffer))))) | |
410 | (save-excursion | |
411 | (setq tc-other nil) | |
412 | (set-buffer b2) | |
413 | (and (tc-other) | |
414 | (not (eq b1 (tc-other))) | |
415 | (error "Buffer already associated with buffer `%s'." | |
416 | (buffer-name (tc-other)))) | |
417 | (setq b1 (and (assq 'tc-window-width (buffer-local-variables)) | |
418 | tc-window-width))) | |
419 | ; if other buffer has a local width, adjust here too | |
420 | (if b1 (setq tc-window-width (- (screen-width) b1))) | |
421 | (tc-split b2))) | |
422 | ||
423 | (defun tc-unmerge (arg) | |
424 | "Unmerge a two-column text into two buffers in two-column minor mode. | |
425 | The text is unmerged at the cursor's column which becomes the local | |
426 | value of tc-window-width. Only lines that have the ARG same | |
427 | preceding characters at that column get split. The ARG preceding | |
428 | characters without any leading whitespace become the local value for | |
429 | `tc-separator'. This way lines that continue across both | |
430 | columns remain untouched in the first buffer. | |
431 | ||
432 | This function can be used with a prototype line, to set up things as | |
433 | you like them. You write the first line of each column with the | |
434 | separator you like and then unmerge that line. E.g.: | |
435 | ||
436 | First column's text sSs Second columns text | |
437 | \\___/\\ | |
438 | / \\ | |
439 | 5 character Separator You type M-5 \\[tc-unmerge] with the point here | |
440 | ||
441 | See \\[tc-split] and `lisp/two-column.el' for further details." | |
442 | (interactive "p") | |
443 | (and (tc-other) | |
444 | (if (y-or-n-p (concat "Overwrite associated buffer `" | |
445 | (buffer-name (tc-other)) | |
446 | "'? ")) | |
447 | (save-excursion | |
448 | (set-buffer (tc-other)) | |
449 | (erase-buffer)) | |
450 | (signal 'quit nil))) | |
451 | (let ((point (point)) | |
452 | ; make next-line always come back to same column | |
453 | (goal-column (current-column)) | |
454 | ; a counter for empty lines in other buffer | |
455 | (n (1- (count-lines (point-min) (point)))) | |
456 | chars other) | |
457 | (save-excursion | |
458 | (backward-char arg) | |
459 | (setq chars (buffer-substring (point) point)) | |
460 | (skip-chars-forward " \t" point) | |
461 | (make-variable-buffer-local 'tc-separator) | |
462 | (setq tc-separator (buffer-substring (point) point) | |
463 | tc-window-width (current-column))) | |
464 | (tc-split) | |
465 | (setq other (tc-other)) | |
466 | ; now we're ready to actually unmerge | |
467 | (save-excursion | |
468 | (while (not (eobp)) | |
469 | (if (not (and (= (current-column) goal-column) | |
470 | (string= chars | |
471 | (buffer-substring (point) | |
472 | (save-excursion | |
473 | (backward-char arg) | |
474 | (point)))))) | |
475 | (setq n (1+ n)) | |
476 | (setq point (point)) | |
477 | (backward-char arg) | |
478 | (skip-chars-backward " \t") | |
479 | (delete-region point (point)) | |
480 | (setq point (point)) | |
481 | (insert-char ?\n n) | |
482 | (append-to-buffer other point (progn (end-of-line) | |
483 | (if (eobp) | |
484 | (point) | |
485 | (1+ (point))))) | |
486 | (delete-region point (point)) | |
487 | (setq n 0)) | |
488 | (next-line 1))))) | |
489 | ||
490 | (defun tc-kill-association () | |
491 | "Turn off two-column minor mode in current and associated buffer. | |
492 | If the associated buffer is unmodified and empty, it is killed." | |
493 | (interactive) | |
494 | (let ((buffer (current-buffer))) | |
495 | (save-excursion | |
496 | (and (tc-other) | |
497 | (prog2 | |
498 | (setq tc-buffer-list | |
499 | (delq (assq tc-other tc-buffer-list) | |
500 | tc-buffer-list)) | |
501 | (set-buffer (tc-other)) | |
502 | (setq tc-buffer-list | |
503 | (delq (assq tc-other tc-buffer-list) | |
504 | tc-buffer-list))) | |
505 | (or (not (tc-other)) | |
506 | (eq buffer (tc-other))) | |
507 | (if (and (not (buffer-modified-p)) | |
508 | (eobp) (bobp)) | |
509 | (kill-buffer nil) | |
510 | (kill-local-variable 'tc-other) | |
511 | (kill-local-variable 'tc-window-width) | |
512 | (kill-local-variable 'tc-separator) | |
513 | (kill-local-variable 'mode-line-format) | |
514 | (kill-local-variable 'fill-column)))) | |
515 | (kill-local-variable 'tc-other) | |
516 | (kill-local-variable 'tc-window-width) | |
517 | (kill-local-variable 'tc-separator) | |
518 | (kill-local-variable 'mode-line-format) | |
519 | (kill-local-variable 'fill-column))) | |
520 | ||
521 | ||
522 | ;; this doesn't use yank-rectangle, so that the first column can | |
523 | ;; contain long lines | |
524 | (defun tc-merge () | |
525 | "Merges the associated buffer with the current buffer. | |
526 | They get merged at the column, which is the value of | |
527 | `tc-window-width', i.e. usually at the vertical window | |
528 | separator. This separator gets replaced with white space. Beyond | |
529 | that the value of gets inserted on merged lines. The two columns are | |
530 | thus pasted side by side, in a single text. If the other buffer is | |
531 | not displayed to the left of this one, then this one becomes the left | |
532 | column. | |
533 | ||
534 | If you want `tc-separator' on empty lines in the second column, | |
535 | you should put just one space in them. In the final result, you can strip | |
536 | off trailing spaces with \\[beginning-of-buffer] \\[replace-regexp] [ SPC TAB ] + $ RET RET" | |
537 | ||
538 | (interactive) | |
539 | (or (tc-other) | |
540 | (error "You must first set two-column minor mode.")) | |
541 | (and (> (car (window-edges)) 0) ; not touching left edge of screen | |
542 | (eq (window-buffer (previous-window)) | |
543 | (tc-other)) | |
544 | (other-window -1)) | |
545 | (save-excursion | |
546 | (let ((b1 (current-buffer)) | |
547 | (b2 (tc-other)) | |
548 | string) | |
549 | (goto-char (point-min)) | |
550 | (set-buffer b2) | |
551 | (goto-char (point-min)) | |
552 | (while (not (eobp)) | |
553 | (setq string (buffer-substring (point) | |
554 | (progn (end-of-line) (point)))) | |
555 | (or (eobp) | |
556 | (forward-char)) ; next line | |
557 | (set-buffer b1) | |
558 | (if (string= string "") | |
559 | () | |
560 | (end-of-line) | |
561 | (indent-to-column tc-window-width) | |
562 | (insert tc-separator string)) | |
563 | (next-line 1) ; add one if necessary | |
564 | (set-buffer b2)))) | |
565 | (if (< (window-width) (screen-width)) | |
566 | (enlarge-window 99999 t))) | |
567 | \f | |
568 | ;;;;; utility functions ;;;;; | |
569 | ||
570 | (defun tc-associated-buffer () | |
571 | "Switch to associated buffer." | |
572 | (interactive) | |
573 | (or (tc-other) | |
574 | (error "You must set two-column minor mode.")) | |
575 | (if (get-buffer-window (tc-other)) | |
576 | (select-window (get-buffer-window (tc-other))) | |
577 | (switch-to-buffer (tc-other)))) | |
578 | ||
579 | ;; It would be desirable to intercept anything that causes the current | |
580 | ;; window to scroll. Maybe a `scroll-hook'? | |
581 | (defun tc-scroll-line (arg) | |
582 | "Scroll current window upward by ARG lines. | |
583 | The associated window gets scrolled to the same line." | |
584 | (interactive "p") | |
585 | (or (tc-other) | |
586 | (error "You must set two-column minor mode.")) | |
587 | ; scroll-up has a bug on arg 0 at end of buffer | |
588 | (or (zerop arg) | |
589 | (scroll-up arg)) | |
590 | (setq arg (count-lines (point-min) (window-start))) | |
591 | ; too bad that pre 18.57 Emacs makes save-window-excursion restore | |
592 | ; the point. When it becomes extinct, we can simplify this. | |
593 | (if (get-buffer-window (tc-other)) | |
594 | (let ((window (selected-window))) | |
595 | (select-window (get-buffer-window (tc-other))) | |
596 | (setq arg (- arg (count-lines (point-min) (window-start)))) | |
597 | ; make sure that other buffer has enough lines | |
598 | (save-excursion | |
599 | (goto-char (point-max)) | |
600 | (insert-char ?\n | |
601 | (- arg (count-lines (window-start) (point-max)) -1))) | |
602 | (or (zerop arg) | |
603 | (scroll-up arg)) | |
604 | (select-window window)))) | |
605 | ||
606 | (defun tc-scroll-up (arg) | |
607 | "Scroll current window upward by ARG screens. | |
608 | The associated window gets scrolled to the same line." | |
609 | (interactive "p") | |
610 | (tc-scroll-line (* arg (- (window-height) | |
611 | next-screen-context-lines 1)))) | |
612 | ||
613 | (defun tc-scroll-down (arg) | |
614 | "Scroll current window downward by ARG screens. | |
615 | The associated window gets scrolled to the same line." | |
616 | (interactive "p") | |
617 | (tc-scroll-line (* arg (- next-screen-context-lines | |
618 | (window-height) -1)))) | |
619 | ||
620 | (defun tc-recenter (arg) | |
621 | "Center point in window. With ARG, put point on line ARG. | |
622 | This counts from bottom if ARG is negative. The associated window | |
623 | gets scrolled to the same line." | |
624 | (interactive "P") | |
625 | (setq arg (and arg (prefix-numeric-value arg))) | |
626 | (tc-scroll-line (- (count-lines (window-start) (point)) | |
627 | (cond ((null arg) (/ (window-height) 2)) | |
628 | ((< arg 0) (+ (window-height) arg)) | |
629 | ( arg))))) | |
630 | ||
631 | (defun enlarge-window-horizontally (arg) | |
632 | "Make current window ARG columns wider." | |
633 | (interactive "p") | |
634 | (enlarge-window arg t) | |
635 | (and (tc-other) | |
636 | (setq tc-window-width (+ tc-window-width arg)) | |
637 | (set-buffer (tc-other)) | |
638 | (setq tc-window-width (- tc-window-width arg)))) | |
639 | ||
640 | (defun shrink-window-horizontally (arg) | |
641 | "Make current window ARG columns narrower." | |
642 | (interactive "p") | |
643 | (enlarge-window-horizontally (- arg))) | |
644 | ||
645 | ;;; two-column.el ends here |