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aac42093 | 1 | ;;; longlines.el --- automatically wrap long lines -*- coding:utf-8 -*- |
cf6ffd8c | 2 | |
73b0cd50 | 3 | ;; Copyright (C) 2000-2001, 2004-2011 Free Software Foundation, Inc. |
cf6ffd8c RS |
4 | |
5 | ;; Authors: Kai Grossjohann <Kai.Grossjohann@CS.Uni-Dortmund.DE> | |
6 | ;; Alex Schroeder <alex@gnu.org> | |
7 | ;; Chong Yidong <cyd@stupidchicken.com> | |
8 | ;; Maintainer: Chong Yidong <cyd@stupidchicken.com> | |
a145b41c | 9 | ;; Keywords: convenience, wp |
cf6ffd8c RS |
10 | |
11 | ;; This file is part of GNU Emacs. | |
12 | ||
eb3fa2cf | 13 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
cf6ffd8c | 14 | ;; it under the terms of the GNU General Public License as published by |
eb3fa2cf GM |
15 | ;; the Free Software Foundation, either version 3 of the License, or |
16 | ;; (at your option) any later version. | |
cf6ffd8c RS |
17 | |
18 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
19 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | ;; GNU General Public License for more details. | |
22 | ||
23 | ;; You should have received a copy of the GNU General Public License | |
eb3fa2cf | 24 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
cf6ffd8c RS |
25 | |
26 | ;;; Commentary: | |
27 | ||
28 | ;; Some text editors save text files with long lines, and they | |
29 | ;; automatically break these lines at whitespace, without actually | |
30 | ;; inserting any newline characters. When doing `M-q' in Emacs, you | |
31 | ;; are inserting newline characters. Longlines mode provides a file | |
32 | ;; format which wraps the long lines when reading a file and unwraps | |
33 | ;; the lines when saving the file. It can also wrap and unwrap | |
34 | ;; automatically as editing takes place. | |
35 | ||
36 | ;; Special thanks to Rod Smith for many useful bug reports. | |
37 | ||
38 | ;;; Code: | |
39 | ||
cf6ffd8c RS |
40 | (defgroup longlines nil |
41 | "Automatic wrapping of long lines when loading files." | |
42 | :group 'fill) | |
43 | ||
44 | (defcustom longlines-auto-wrap t | |
da95a9c8 | 45 | "Non-nil means long lines are automatically wrapped after each command. |
cf6ffd8c RS |
46 | Otherwise, you can perform filling using `fill-paragraph' or |
47 | `auto-fill-mode'. In any case, the soft newlines will be removed | |
48 | when the file is saved to disk." | |
49 | :group 'longlines | |
50 | :type 'boolean) | |
51 | ||
52 | (defcustom longlines-wrap-follows-window-size nil | |
da95a9c8 | 53 | "Non-nil means wrapping and filling happen at the edge of the window. |
cf6ffd8c RS |
54 | Otherwise, `fill-column' is used, regardless of the window size. This |
55 | does not work well when the buffer is displayed in multiple windows | |
c455889d CY |
56 | with differing widths. |
57 | ||
58 | If the value is an integer, that specifies the distance from the | |
59 | right edge of the window at which wrapping occurs. For any other | |
60 | non-nil value, wrapping occurs 2 characters from the right edge." | |
cf6ffd8c RS |
61 | :group 'longlines |
62 | :type 'boolean) | |
63 | ||
64 | (defcustom longlines-show-hard-newlines nil | |
da95a9c8 | 65 | "Non-nil means each hard newline is marked on the screen. |
c29316d5 | 66 | \(The variable `longlines-show-effect' controls what they look like.) |
cf6ffd8c | 67 | You can also enable the display temporarily, using the command |
f0770b09 | 68 | `longlines-show-hard-newlines'." |
cf6ffd8c RS |
69 | :group 'longlines |
70 | :type 'boolean) | |
71 | ||
12e18d7d | 72 | (defcustom longlines-show-effect (propertize "¶\n" 'face 'escape-glyph) |
da95a9c8 | 73 | "A string to display when showing hard newlines. |
cf6ffd8c RS |
74 | This is used when `longlines-show-hard-newlines' is on." |
75 | :group 'longlines | |
76 | :type 'string) | |
77 | ||
78 | ;; Internal variables | |
79 | ||
80 | (defvar longlines-wrap-beg nil) | |
81 | (defvar longlines-wrap-end nil) | |
82 | (defvar longlines-wrap-point nil) | |
83 | (defvar longlines-showing nil) | |
8a7e2b23 | 84 | (defvar longlines-decoded nil) |
cf6ffd8c RS |
85 | |
86 | (make-variable-buffer-local 'longlines-wrap-beg) | |
87 | (make-variable-buffer-local 'longlines-wrap-end) | |
88 | (make-variable-buffer-local 'longlines-wrap-point) | |
89 | (make-variable-buffer-local 'longlines-showing) | |
8a7e2b23 | 90 | (make-variable-buffer-local 'longlines-decoded) |
cf6ffd8c RS |
91 | |
92 | ;; Mode | |
93 | ||
fc5e09b3 DN |
94 | (defvar message-indent-citation-function) |
95 | ||
cf6ffd8c RS |
96 | ;;;###autoload |
97 | (define-minor-mode longlines-mode | |
36adf6ce | 98 | "Minor mode to wrap long lines. |
cf6ffd8c RS |
99 | In Long Lines mode, long lines are wrapped if they extend beyond |
100 | `fill-column'. The soft newlines used for line wrapping will not | |
101 | show up when the text is yanked or saved to disk. | |
102 | ||
75bfc667 JL |
103 | With no argument, this command toggles Long Lines mode. |
104 | With a prefix argument ARG, turn Long Lines minor mode on if ARG is positive, | |
36adf6ce LMI |
105 | otherwise turn it off. |
106 | ||
c29316d5 | 107 | If the variable `longlines-auto-wrap' is non-nil, lines are automatically |
cf6ffd8c RS |
108 | wrapped whenever the buffer is changed. You can always call |
109 | `fill-paragraph' to fill individual paragraphs. | |
110 | ||
c29316d5 RS |
111 | If the variable `longlines-show-hard-newlines' is non-nil, hard newlines |
112 | are indicated with a symbol." | |
6da6c2fe | 113 | :group 'longlines :lighter " ll" |
cf6ffd8c RS |
114 | (if longlines-mode |
115 | ;; Turn on longlines mode | |
116 | (progn | |
117 | (use-hard-newlines 1 'never) | |
118 | (set (make-local-variable 'require-final-newline) nil) | |
119 | (add-to-list 'buffer-file-format 'longlines) | |
120 | (add-hook 'change-major-mode-hook 'longlines-mode-off nil t) | |
b39aa4fd | 121 | (add-hook 'before-revert-hook 'longlines-before-revert-hook nil t) |
cf6ffd8c | 122 | (make-local-variable 'buffer-substring-filters) |
a1d155a4 | 123 | (make-local-variable 'longlines-auto-wrap) |
930aae96 | 124 | (set (make-local-variable 'isearch-search-fun-function) |
7f5bb182 | 125 | 'longlines-search-function) |
e87085e6 CY |
126 | (set (make-local-variable 'replace-search-function) |
127 | 'longlines-search-forward) | |
128 | (set (make-local-variable 'replace-re-search-function) | |
129 | 'longlines-re-search-forward) | |
cf6ffd8c RS |
130 | (add-to-list 'buffer-substring-filters 'longlines-encode-string) |
131 | (when longlines-wrap-follows-window-size | |
c455889d CY |
132 | (let ((dw (if (and (integerp longlines-wrap-follows-window-size) |
133 | (>= longlines-wrap-follows-window-size 0) | |
134 | (< longlines-wrap-follows-window-size | |
135 | (window-width))) | |
136 | longlines-wrap-follows-window-size | |
137 | 2))) | |
138 | (set (make-local-variable 'fill-column) | |
139 | (- (window-width) dw))) | |
cf6ffd8c RS |
140 | (add-hook 'window-configuration-change-hook |
141 | 'longlines-window-change-function nil t)) | |
142 | (let ((buffer-undo-list t) | |
6fd388f3 | 143 | (inhibit-read-only t) |
a145b41c | 144 | (after-change-functions nil) |
91b53ad5 MR |
145 | (mod (buffer-modified-p)) |
146 | buffer-file-name buffer-file-truename) | |
cf6ffd8c RS |
147 | ;; Turning off undo is OK since (spaces + newlines) is |
148 | ;; conserved, except for a corner case in | |
149 | ;; longlines-wrap-lines that we'll never encounter from here | |
e7b382ed CY |
150 | (save-restriction |
151 | (widen) | |
8a7e2b23 CY |
152 | (unless longlines-decoded |
153 | (longlines-decode-buffer) | |
154 | (setq longlines-decoded t)) | |
eb0d2864 | 155 | (longlines-wrap-region (point-min) (point-max))) |
cf6ffd8c RS |
156 | (set-buffer-modified-p mod)) |
157 | (when (and longlines-show-hard-newlines | |
158 | (not longlines-showing)) | |
159 | (longlines-show-hard-newlines)) | |
0f157ad5 CY |
160 | |
161 | ;; Hacks to make longlines play nice with various modes. | |
162 | (cond ((eq major-mode 'mail-mode) | |
15575807 | 163 | (add-hook 'mail-setup-hook 'longlines-decode-buffer nil t) |
0f157ad5 CY |
164 | (or mail-citation-hook |
165 | (add-hook 'mail-citation-hook 'mail-indent-citation nil t)) | |
166 | (add-hook 'mail-citation-hook 'longlines-decode-region nil t)) | |
167 | ((eq major-mode 'message-mode) | |
2c127d45 | 168 | (add-hook 'message-setup-hook 'longlines-decode-buffer nil t) |
0f157ad5 CY |
169 | (make-local-variable 'message-indent-citation-function) |
170 | (if (not (listp message-indent-citation-function)) | |
171 | (setq message-indent-citation-function | |
172 | (list message-indent-citation-function))) | |
173 | (add-to-list 'message-indent-citation-function | |
174 | 'longlines-decode-region t))) | |
426f8573 | 175 | |
a1d155a4 CY |
176 | (add-hook 'after-change-functions 'longlines-after-change-function nil t) |
177 | (add-hook 'post-command-hook 'longlines-post-command-function nil t) | |
426f8573 | 178 | (when longlines-auto-wrap |
a1d155a4 | 179 | (auto-fill-mode 0))) |
cf6ffd8c RS |
180 | ;; Turn off longlines mode |
181 | (setq buffer-file-format (delete 'longlines buffer-file-format)) | |
182 | (if longlines-showing | |
183 | (longlines-unshow-hard-newlines)) | |
6fd388f3 | 184 | (let ((buffer-undo-list t) |
a145b41c | 185 | (after-change-functions nil) |
91b53ad5 MR |
186 | (inhibit-read-only t) |
187 | buffer-file-name buffer-file-truename) | |
8a7e2b23 CY |
188 | (if longlines-decoded |
189 | (save-restriction | |
190 | (widen) | |
191 | (longlines-encode-region (point-min) (point-max)) | |
192 | (setq longlines-decoded nil)))) | |
cf6ffd8c | 193 | (remove-hook 'change-major-mode-hook 'longlines-mode-off t) |
cf6ffd8c RS |
194 | (remove-hook 'after-change-functions 'longlines-after-change-function t) |
195 | (remove-hook 'post-command-hook 'longlines-post-command-function t) | |
b39aa4fd | 196 | (remove-hook 'before-revert-hook 'longlines-before-revert-hook t) |
cf6ffd8c RS |
197 | (remove-hook 'window-configuration-change-hook |
198 | 'longlines-window-change-function t) | |
6fd388f3 CY |
199 | (when longlines-wrap-follows-window-size |
200 | (kill-local-variable 'fill-column)) | |
930aae96 | 201 | (kill-local-variable 'isearch-search-fun-function) |
e87085e6 CY |
202 | (kill-local-variable 'replace-search-function) |
203 | (kill-local-variable 'replace-re-search-function) | |
6fd388f3 CY |
204 | (kill-local-variable 'require-final-newline) |
205 | (kill-local-variable 'buffer-substring-filters) | |
206 | (kill-local-variable 'use-hard-newlines))) | |
cf6ffd8c RS |
207 | |
208 | (defun longlines-mode-off () | |
209 | "Turn off longlines mode. | |
210 | This function exists to be called by `change-major-mode-hook' when the | |
211 | major mode changes." | |
212 | (longlines-mode 0)) | |
213 | ||
214 | ;; Showing the effect of hard newlines in the buffer | |
215 | ||
cf6ffd8c RS |
216 | (defun longlines-show-hard-newlines (&optional arg) |
217 | "Make hard newlines visible by adding a face. | |
218 | With optional argument ARG, make the hard newlines invisible again." | |
219 | (interactive "P") | |
cf6ffd8c RS |
220 | (if arg |
221 | (longlines-unshow-hard-newlines) | |
222 | (setq longlines-showing t) | |
fc0eafe1 | 223 | (longlines-show-region (point-min) (point-max)))) |
cf6ffd8c RS |
224 | |
225 | (defun longlines-show-region (beg end) | |
226 | "Make hard newlines between BEG and END visible." | |
227 | (let* ((pmin (min beg end)) | |
228 | (pmax (max beg end)) | |
da95a9c8 | 229 | (pos (text-property-not-all pmin pmax 'hard nil)) |
fc0eafe1 MR |
230 | (mod (buffer-modified-p)) |
231 | (buffer-undo-list t) | |
232 | (inhibit-read-only t) | |
91b53ad5 MR |
233 | (inhibit-modification-hooks t) |
234 | buffer-file-name buffer-file-truename) | |
cf6ffd8c RS |
235 | (while pos |
236 | (put-text-property pos (1+ pos) 'display | |
fc0eafe1 MR |
237 | (copy-sequence longlines-show-effect)) |
238 | (setq pos (text-property-not-all (1+ pos) pmax 'hard nil))) | |
239 | (restore-buffer-modified-p mod))) | |
cf6ffd8c RS |
240 | |
241 | (defun longlines-unshow-hard-newlines () | |
242 | "Make hard newlines invisible again." | |
243 | (interactive) | |
244 | (setq longlines-showing nil) | |
fc0eafe1 MR |
245 | (let ((pos (text-property-not-all (point-min) (point-max) 'hard nil)) |
246 | (mod (buffer-modified-p)) | |
247 | (buffer-undo-list t) | |
248 | (inhibit-read-only t) | |
91b53ad5 MR |
249 | (inhibit-modification-hooks t) |
250 | buffer-file-name buffer-file-truename) | |
cf6ffd8c RS |
251 | (while pos |
252 | (remove-text-properties pos (1+ pos) '(display)) | |
fc0eafe1 MR |
253 | (setq pos (text-property-not-all (1+ pos) (point-max) 'hard nil))) |
254 | (restore-buffer-modified-p mod))) | |
cf6ffd8c RS |
255 | |
256 | ;; Wrapping the paragraphs. | |
257 | ||
258 | (defun longlines-wrap-region (beg end) | |
259 | "Wrap each successive line, starting with the line before BEG. | |
260 | Stop when we reach lines after END that don't need wrapping, or the | |
261 | end of the buffer." | |
85a0b368 CY |
262 | (let ((mod (buffer-modified-p))) |
263 | (setq longlines-wrap-point (point)) | |
264 | (goto-char beg) | |
265 | (forward-line -1) | |
266 | ;; Two successful longlines-wrap-line's in a row mean successive | |
267 | ;; lines don't need wrapping. | |
268 | (while (null (and (longlines-wrap-line) | |
269 | (or (eobp) | |
270 | (and (>= (point) end) | |
271 | (longlines-wrap-line)))))) | |
272 | (goto-char longlines-wrap-point) | |
273 | (set-buffer-modified-p mod))) | |
cf6ffd8c RS |
274 | |
275 | (defun longlines-wrap-line () | |
276 | "If the current line needs to be wrapped, wrap it and return nil. | |
277 | If wrapping is performed, point remains on the line. If the line does | |
278 | not need to be wrapped, move point to the next line and return t." | |
279 | (if (longlines-set-breakpoint) | |
cee723fb CY |
280 | (progn (insert-before-markers ?\n) |
281 | (backward-char 1) | |
282 | (delete-char -1) | |
283 | (forward-char 1) | |
cf6ffd8c RS |
284 | nil) |
285 | (if (longlines-merge-lines-p) | |
286 | (progn (end-of-line) | |
cf6ffd8c RS |
287 | ;; After certain commands (e.g. kill-line), there may be two |
288 | ;; successive soft newlines in the buffer. In this case, we | |
289 | ;; replace these two newlines by a single space. Unfortunately, | |
290 | ;; this breaks the conservation of (spaces + newlines), so we | |
291 | ;; have to fiddle with longlines-wrap-point. | |
e5ad37ee DK |
292 | (if (or (prog1 (bolp) (forward-char 1)) (eolp)) |
293 | (progn | |
294 | (delete-char -1) | |
295 | (if (> longlines-wrap-point (point)) | |
296 | (setq longlines-wrap-point | |
297 | (1- longlines-wrap-point)))) | |
443012f0 | 298 | (insert-before-markers-and-inherit ?\s) |
e5ad37ee DK |
299 | (backward-char 1) |
300 | (delete-char -1) | |
301 | (forward-char 1)) | |
cf6ffd8c RS |
302 | nil) |
303 | (forward-line 1) | |
304 | t))) | |
305 | ||
306 | (defun longlines-set-breakpoint () | |
307 | "Place point where we should break the current line, and return t. | |
308 | If the line should not be broken, return nil; point remains on the | |
309 | line." | |
310 | (move-to-column fill-column) | |
311 | (if (and (re-search-forward "[^ ]" (line-end-position) 1) | |
312 | (> (current-column) fill-column)) | |
313 | ;; This line is too long. Can we break it? | |
314 | (or (longlines-find-break-backward) | |
315 | (progn (move-to-column fill-column) | |
316 | (longlines-find-break-forward))))) | |
317 | ||
318 | (defun longlines-find-break-backward () | |
319 | "Move point backward to the first available breakpoint and return t. | |
320 | If no breakpoint is found, return nil." | |
321 | (and (search-backward " " (line-beginning-position) 1) | |
322 | (save-excursion | |
323 | (skip-chars-backward " " (line-beginning-position)) | |
324 | (null (bolp))) | |
325 | (progn (forward-char 1) | |
326 | (if (and fill-nobreak-predicate | |
327 | (run-hook-with-args-until-success | |
328 | 'fill-nobreak-predicate)) | |
329 | (progn (skip-chars-backward " " (line-beginning-position)) | |
330 | (longlines-find-break-backward)) | |
331 | t)))) | |
332 | ||
333 | (defun longlines-find-break-forward () | |
334 | "Move point forward to the first available breakpoint and return t. | |
335 | If no break point is found, return nil." | |
336 | (and (search-forward " " (line-end-position) 1) | |
337 | (progn (skip-chars-forward " " (line-end-position)) | |
338 | (null (eolp))) | |
339 | (if (and fill-nobreak-predicate | |
340 | (run-hook-with-args-until-success | |
341 | 'fill-nobreak-predicate)) | |
342 | (longlines-find-break-forward) | |
343 | t))) | |
344 | ||
345 | (defun longlines-merge-lines-p () | |
346 | "Return t if part of the next line can fit onto the current line. | |
347 | Otherwise, return nil. Text cannot be moved across hard newlines." | |
348 | (save-excursion | |
349 | (end-of-line) | |
350 | (and (null (eobp)) | |
351 | (null (get-text-property (point) 'hard)) | |
352 | (let ((space (- fill-column (current-column)))) | |
353 | (forward-line 1) | |
354 | (if (eq (char-after) ? ) | |
355 | t ; We can always merge some spaces | |
356 | (<= (if (search-forward " " (line-end-position) 1) | |
357 | (current-column) | |
358 | (1+ (current-column))) | |
359 | space)))))) | |
360 | ||
0f157ad5 CY |
361 | (defun longlines-decode-region (&optional beg end) |
362 | "Turn all newlines between BEG and END into hard newlines. | |
363 | If BEG and END are nil, the point and mark are used." | |
364 | (if (null beg) (setq beg (point))) | |
365 | (if (null end) (setq end (mark t))) | |
cf6ffd8c | 366 | (save-excursion |
eb0d2864 CY |
367 | (let ((reg-max (max beg end))) |
368 | (goto-char (min beg end)) | |
369 | (while (search-forward "\n" reg-max t) | |
370 | (set-hard-newline-properties | |
371 | (match-beginning 0) (match-end 0)))))) | |
cf6ffd8c | 372 | |
2c127d45 CY |
373 | (defun longlines-decode-buffer () |
374 | "Turn all newlines in the buffer into hard newlines." | |
375 | (longlines-decode-region (point-min) (point-max))) | |
376 | ||
06b60517 | 377 | (defun longlines-encode-region (beg end &optional _buffer) |
cf6ffd8c RS |
378 | "Replace each soft newline between BEG and END with exactly one space. |
379 | Hard newlines are left intact. The optional argument BUFFER exists for | |
380 | compatibility with `format-alist', and is ignored." | |
381 | (save-excursion | |
eb0d2864 CY |
382 | (let ((reg-max (max beg end)) |
383 | (mod (buffer-modified-p))) | |
cf6ffd8c | 384 | (goto-char (min beg end)) |
eb0d2864 | 385 | (while (search-forward "\n" reg-max t) |
cf6ffd8c RS |
386 | (unless (get-text-property (match-beginning 0) 'hard) |
387 | (replace-match " "))) | |
388 | (set-buffer-modified-p mod) | |
389 | end))) | |
390 | ||
391 | (defun longlines-encode-string (string) | |
392 | "Return a copy of STRING with each soft newline replaced by a space. | |
393 | Hard newlines are left intact." | |
394 | (let* ((str (copy-sequence string)) | |
395 | (pos (string-match "\n" str))) | |
396 | (while pos | |
397 | (if (null (get-text-property pos 'hard str)) | |
398 | (aset str pos ? )) | |
399 | (setq pos (string-match "\n" str (1+ pos)))) | |
400 | str)) | |
401 | ||
402 | ;; Auto wrap | |
403 | ||
404 | (defun longlines-auto-wrap (&optional arg) | |
a1d155a4 CY |
405 | "Toggle automatic line wrapping. |
406 | With optional argument ARG, turn on line wrapping if and only if ARG is positive. | |
407 | If automatic line wrapping is turned on, wrap the entire buffer." | |
cf6ffd8c | 408 | (interactive "P") |
a1d155a4 CY |
409 | (setq arg (if arg |
410 | (> (prefix-numeric-value arg) 0) | |
411 | (not longlines-auto-wrap))) | |
cf6ffd8c | 412 | (if arg |
85a0b368 | 413 | (progn |
a1d155a4 CY |
414 | (setq longlines-auto-wrap t) |
415 | (longlines-wrap-region (point-min) (point-max)) | |
a1d155a4 CY |
416 | (message "Auto wrap enabled.")) |
417 | (setq longlines-auto-wrap nil) | |
418 | (message "Auto wrap disabled."))) | |
cf6ffd8c | 419 | |
06b60517 | 420 | (defun longlines-after-change-function (beg end _len) |
cf6ffd8c RS |
421 | "Update `longlines-wrap-beg' and `longlines-wrap-end'. |
422 | This is called by `after-change-functions' to keep track of the region | |
423 | that has changed." | |
a1d155a4 | 424 | (when (and longlines-auto-wrap (not undo-in-progress)) |
cf6ffd8c RS |
425 | (setq longlines-wrap-beg |
426 | (if longlines-wrap-beg (min longlines-wrap-beg beg) beg)) | |
427 | (setq longlines-wrap-end | |
428 | (if longlines-wrap-end (max longlines-wrap-end end) end)))) | |
429 | ||
430 | (defun longlines-post-command-function () | |
431 | "Perform line wrapping on the parts of the buffer that have changed. | |
432 | This is called by `post-command-hook' after each command." | |
a1d155a4 | 433 | (when (and longlines-auto-wrap longlines-wrap-beg) |
e17833bc CY |
434 | (if (or (eq this-command 'yank) |
435 | (eq this-command 'yank-pop)) | |
436 | (longlines-decode-region (point) (mark t))) | |
437 | (if longlines-showing | |
438 | (longlines-show-region longlines-wrap-beg longlines-wrap-end)) | |
cf6ffd8c RS |
439 | (unless (or (eq this-command 'fill-paragraph) |
440 | (eq this-command 'fill-region)) | |
441 | (longlines-wrap-region longlines-wrap-beg longlines-wrap-end)) | |
442 | (setq longlines-wrap-beg nil) | |
443 | (setq longlines-wrap-end nil))) | |
444 | ||
445 | (defun longlines-window-change-function () | |
446 | "Re-wrap the buffer if the window width has changed. | |
a3545af4 | 447 | This is called by `window-configuration-change-hook'." |
c455889d CY |
448 | (let ((dw (if (and (integerp longlines-wrap-follows-window-size) |
449 | (>= longlines-wrap-follows-window-size 0) | |
450 | (< longlines-wrap-follows-window-size (window-width))) | |
451 | longlines-wrap-follows-window-size | |
452 | 2))) | |
453 | (when (/= fill-column (- (window-width) dw)) | |
454 | (setq fill-column (- (window-width) dw)) | |
455 | (longlines-wrap-region (point-min) (point-max))))) | |
cf6ffd8c | 456 | |
930aae96 CY |
457 | ;; Isearch |
458 | ||
7f5bb182 | 459 | (defun longlines-search-function () |
930aae96 CY |
460 | (cond |
461 | (isearch-word | |
462 | (if isearch-forward 'word-search-forward 'word-search-backward)) | |
463 | (isearch-regexp | |
464 | (if isearch-forward 're-search-forward 're-search-backward)) | |
465 | (t | |
466 | (if isearch-forward | |
467 | 'longlines-search-forward | |
468 | 'longlines-search-backward)))) | |
469 | ||
470 | (defun longlines-search-forward (string &optional bound noerror count) | |
667adde1 | 471 | (let ((search-spaces-regexp " *[ \n]")) |
930aae96 CY |
472 | (re-search-forward (regexp-quote string) bound noerror count))) |
473 | ||
474 | (defun longlines-search-backward (string &optional bound noerror count) | |
667adde1 | 475 | (let ((search-spaces-regexp " *[ \n]")) |
930aae96 CY |
476 | (re-search-backward (regexp-quote string) bound noerror count))) |
477 | ||
e87085e6 | 478 | (defun longlines-re-search-forward (string &optional bound noerror count) |
667adde1 | 479 | (let ((search-spaces-regexp " *[ \n]")) |
e87085e6 CY |
480 | (re-search-forward string bound noerror count))) |
481 | ||
cf6ffd8c RS |
482 | ;; Loading and saving |
483 | ||
b39aa4fd CY |
484 | (defun longlines-before-revert-hook () |
485 | (add-hook 'after-revert-hook 'longlines-after-revert-hook nil t) | |
486 | (longlines-mode 0)) | |
487 | ||
488 | (defun longlines-after-revert-hook () | |
489 | (remove-hook 'after-revert-hook 'longlines-after-revert-hook t) | |
490 | (longlines-mode 1)) | |
491 | ||
cf6ffd8c RS |
492 | (add-to-list |
493 | 'format-alist | |
c613b39c | 494 | (list 'longlines "Automatically wrap long lines." nil nil |
b39aa4fd | 495 | 'longlines-encode-region t nil)) |
cf6ffd8c | 496 | |
c172e101 JB |
497 | ;; Unloading |
498 | ||
499 | (defun longlines-unload-function () | |
500 | "Unload the longlines library." | |
501 | (save-current-buffer | |
502 | (dolist (buffer (buffer-list)) | |
503 | (set-buffer buffer) | |
504 | (longlines-mode-off))) | |
505 | ;; continue standard unloading | |
506 | nil) | |
507 | ||
cf6ffd8c RS |
508 | (provide 'longlines) |
509 | ||
510 | ;;; longlines.el ends here |