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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 | |
98 | "Toggle Long Lines mode. | |
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 | ||
c29316d5 | 103 | If the variable `longlines-auto-wrap' is non-nil, lines are automatically |
cf6ffd8c RS |
104 | wrapped whenever the buffer is changed. You can always call |
105 | `fill-paragraph' to fill individual paragraphs. | |
106 | ||
c29316d5 RS |
107 | If the variable `longlines-show-hard-newlines' is non-nil, hard newlines |
108 | are indicated with a symbol." | |
6da6c2fe | 109 | :group 'longlines :lighter " ll" |
cf6ffd8c RS |
110 | (if longlines-mode |
111 | ;; Turn on longlines mode | |
112 | (progn | |
113 | (use-hard-newlines 1 'never) | |
114 | (set (make-local-variable 'require-final-newline) nil) | |
115 | (add-to-list 'buffer-file-format 'longlines) | |
116 | (add-hook 'change-major-mode-hook 'longlines-mode-off nil t) | |
b39aa4fd | 117 | (add-hook 'before-revert-hook 'longlines-before-revert-hook nil t) |
cf6ffd8c | 118 | (make-local-variable 'buffer-substring-filters) |
a1d155a4 | 119 | (make-local-variable 'longlines-auto-wrap) |
930aae96 | 120 | (set (make-local-variable 'isearch-search-fun-function) |
7f5bb182 | 121 | 'longlines-search-function) |
e87085e6 CY |
122 | (set (make-local-variable 'replace-search-function) |
123 | 'longlines-search-forward) | |
124 | (set (make-local-variable 'replace-re-search-function) | |
125 | 'longlines-re-search-forward) | |
cf6ffd8c RS |
126 | (add-to-list 'buffer-substring-filters 'longlines-encode-string) |
127 | (when longlines-wrap-follows-window-size | |
c455889d CY |
128 | (let ((dw (if (and (integerp longlines-wrap-follows-window-size) |
129 | (>= longlines-wrap-follows-window-size 0) | |
130 | (< longlines-wrap-follows-window-size | |
131 | (window-width))) | |
132 | longlines-wrap-follows-window-size | |
133 | 2))) | |
134 | (set (make-local-variable 'fill-column) | |
135 | (- (window-width) dw))) | |
cf6ffd8c RS |
136 | (add-hook 'window-configuration-change-hook |
137 | 'longlines-window-change-function nil t)) | |
138 | (let ((buffer-undo-list t) | |
6fd388f3 | 139 | (inhibit-read-only t) |
a145b41c | 140 | (after-change-functions nil) |
91b53ad5 MR |
141 | (mod (buffer-modified-p)) |
142 | buffer-file-name buffer-file-truename) | |
cf6ffd8c RS |
143 | ;; Turning off undo is OK since (spaces + newlines) is |
144 | ;; conserved, except for a corner case in | |
145 | ;; longlines-wrap-lines that we'll never encounter from here | |
e7b382ed CY |
146 | (save-restriction |
147 | (widen) | |
8a7e2b23 CY |
148 | (unless longlines-decoded |
149 | (longlines-decode-buffer) | |
150 | (setq longlines-decoded t)) | |
eb0d2864 | 151 | (longlines-wrap-region (point-min) (point-max))) |
cf6ffd8c RS |
152 | (set-buffer-modified-p mod)) |
153 | (when (and longlines-show-hard-newlines | |
154 | (not longlines-showing)) | |
155 | (longlines-show-hard-newlines)) | |
0f157ad5 CY |
156 | |
157 | ;; Hacks to make longlines play nice with various modes. | |
158 | (cond ((eq major-mode 'mail-mode) | |
15575807 | 159 | (add-hook 'mail-setup-hook 'longlines-decode-buffer nil t) |
0f157ad5 CY |
160 | (or mail-citation-hook |
161 | (add-hook 'mail-citation-hook 'mail-indent-citation nil t)) | |
162 | (add-hook 'mail-citation-hook 'longlines-decode-region nil t)) | |
163 | ((eq major-mode 'message-mode) | |
2c127d45 | 164 | (add-hook 'message-setup-hook 'longlines-decode-buffer nil t) |
0f157ad5 CY |
165 | (make-local-variable 'message-indent-citation-function) |
166 | (if (not (listp message-indent-citation-function)) | |
167 | (setq message-indent-citation-function | |
168 | (list message-indent-citation-function))) | |
169 | (add-to-list 'message-indent-citation-function | |
170 | 'longlines-decode-region t))) | |
426f8573 | 171 | |
a1d155a4 CY |
172 | (add-hook 'after-change-functions 'longlines-after-change-function nil t) |
173 | (add-hook 'post-command-hook 'longlines-post-command-function nil t) | |
426f8573 | 174 | (when longlines-auto-wrap |
a1d155a4 | 175 | (auto-fill-mode 0))) |
cf6ffd8c RS |
176 | ;; Turn off longlines mode |
177 | (setq buffer-file-format (delete 'longlines buffer-file-format)) | |
178 | (if longlines-showing | |
179 | (longlines-unshow-hard-newlines)) | |
6fd388f3 | 180 | (let ((buffer-undo-list t) |
a145b41c | 181 | (after-change-functions nil) |
91b53ad5 MR |
182 | (inhibit-read-only t) |
183 | buffer-file-name buffer-file-truename) | |
8a7e2b23 CY |
184 | (if longlines-decoded |
185 | (save-restriction | |
186 | (widen) | |
187 | (longlines-encode-region (point-min) (point-max)) | |
188 | (setq longlines-decoded nil)))) | |
cf6ffd8c | 189 | (remove-hook 'change-major-mode-hook 'longlines-mode-off t) |
cf6ffd8c RS |
190 | (remove-hook 'after-change-functions 'longlines-after-change-function t) |
191 | (remove-hook 'post-command-hook 'longlines-post-command-function t) | |
b39aa4fd | 192 | (remove-hook 'before-revert-hook 'longlines-before-revert-hook t) |
cf6ffd8c RS |
193 | (remove-hook 'window-configuration-change-hook |
194 | 'longlines-window-change-function t) | |
6fd388f3 CY |
195 | (when longlines-wrap-follows-window-size |
196 | (kill-local-variable 'fill-column)) | |
930aae96 | 197 | (kill-local-variable 'isearch-search-fun-function) |
e87085e6 CY |
198 | (kill-local-variable 'replace-search-function) |
199 | (kill-local-variable 'replace-re-search-function) | |
6fd388f3 CY |
200 | (kill-local-variable 'require-final-newline) |
201 | (kill-local-variable 'buffer-substring-filters) | |
202 | (kill-local-variable 'use-hard-newlines))) | |
cf6ffd8c RS |
203 | |
204 | (defun longlines-mode-off () | |
205 | "Turn off longlines mode. | |
206 | This function exists to be called by `change-major-mode-hook' when the | |
207 | major mode changes." | |
208 | (longlines-mode 0)) | |
209 | ||
210 | ;; Showing the effect of hard newlines in the buffer | |
211 | ||
cf6ffd8c RS |
212 | (defun longlines-show-hard-newlines (&optional arg) |
213 | "Make hard newlines visible by adding a face. | |
214 | With optional argument ARG, make the hard newlines invisible again." | |
215 | (interactive "P") | |
cf6ffd8c RS |
216 | (if arg |
217 | (longlines-unshow-hard-newlines) | |
218 | (setq longlines-showing t) | |
fc0eafe1 | 219 | (longlines-show-region (point-min) (point-max)))) |
cf6ffd8c RS |
220 | |
221 | (defun longlines-show-region (beg end) | |
222 | "Make hard newlines between BEG and END visible." | |
223 | (let* ((pmin (min beg end)) | |
224 | (pmax (max beg end)) | |
da95a9c8 | 225 | (pos (text-property-not-all pmin pmax 'hard nil)) |
fc0eafe1 MR |
226 | (mod (buffer-modified-p)) |
227 | (buffer-undo-list t) | |
228 | (inhibit-read-only t) | |
91b53ad5 MR |
229 | (inhibit-modification-hooks t) |
230 | buffer-file-name buffer-file-truename) | |
cf6ffd8c RS |
231 | (while pos |
232 | (put-text-property pos (1+ pos) 'display | |
fc0eafe1 MR |
233 | (copy-sequence longlines-show-effect)) |
234 | (setq pos (text-property-not-all (1+ pos) pmax 'hard nil))) | |
235 | (restore-buffer-modified-p mod))) | |
cf6ffd8c RS |
236 | |
237 | (defun longlines-unshow-hard-newlines () | |
238 | "Make hard newlines invisible again." | |
239 | (interactive) | |
240 | (setq longlines-showing nil) | |
fc0eafe1 MR |
241 | (let ((pos (text-property-not-all (point-min) (point-max) 'hard nil)) |
242 | (mod (buffer-modified-p)) | |
243 | (buffer-undo-list t) | |
244 | (inhibit-read-only t) | |
91b53ad5 MR |
245 | (inhibit-modification-hooks t) |
246 | buffer-file-name buffer-file-truename) | |
cf6ffd8c RS |
247 | (while pos |
248 | (remove-text-properties pos (1+ pos) '(display)) | |
fc0eafe1 MR |
249 | (setq pos (text-property-not-all (1+ pos) (point-max) 'hard nil))) |
250 | (restore-buffer-modified-p mod))) | |
cf6ffd8c RS |
251 | |
252 | ;; Wrapping the paragraphs. | |
253 | ||
254 | (defun longlines-wrap-region (beg end) | |
255 | "Wrap each successive line, starting with the line before BEG. | |
256 | Stop when we reach lines after END that don't need wrapping, or the | |
257 | end of the buffer." | |
85a0b368 CY |
258 | (let ((mod (buffer-modified-p))) |
259 | (setq longlines-wrap-point (point)) | |
260 | (goto-char beg) | |
261 | (forward-line -1) | |
262 | ;; Two successful longlines-wrap-line's in a row mean successive | |
263 | ;; lines don't need wrapping. | |
264 | (while (null (and (longlines-wrap-line) | |
265 | (or (eobp) | |
266 | (and (>= (point) end) | |
267 | (longlines-wrap-line)))))) | |
268 | (goto-char longlines-wrap-point) | |
269 | (set-buffer-modified-p mod))) | |
cf6ffd8c RS |
270 | |
271 | (defun longlines-wrap-line () | |
272 | "If the current line needs to be wrapped, wrap it and return nil. | |
273 | If wrapping is performed, point remains on the line. If the line does | |
274 | not need to be wrapped, move point to the next line and return t." | |
275 | (if (longlines-set-breakpoint) | |
cee723fb CY |
276 | (progn (insert-before-markers ?\n) |
277 | (backward-char 1) | |
278 | (delete-char -1) | |
279 | (forward-char 1) | |
cf6ffd8c RS |
280 | nil) |
281 | (if (longlines-merge-lines-p) | |
282 | (progn (end-of-line) | |
cf6ffd8c RS |
283 | ;; After certain commands (e.g. kill-line), there may be two |
284 | ;; successive soft newlines in the buffer. In this case, we | |
285 | ;; replace these two newlines by a single space. Unfortunately, | |
286 | ;; this breaks the conservation of (spaces + newlines), so we | |
287 | ;; have to fiddle with longlines-wrap-point. | |
e5ad37ee DK |
288 | (if (or (prog1 (bolp) (forward-char 1)) (eolp)) |
289 | (progn | |
290 | (delete-char -1) | |
291 | (if (> longlines-wrap-point (point)) | |
292 | (setq longlines-wrap-point | |
293 | (1- longlines-wrap-point)))) | |
443012f0 | 294 | (insert-before-markers-and-inherit ?\s) |
e5ad37ee DK |
295 | (backward-char 1) |
296 | (delete-char -1) | |
297 | (forward-char 1)) | |
cf6ffd8c RS |
298 | nil) |
299 | (forward-line 1) | |
300 | t))) | |
301 | ||
302 | (defun longlines-set-breakpoint () | |
303 | "Place point where we should break the current line, and return t. | |
304 | If the line should not be broken, return nil; point remains on the | |
305 | line." | |
306 | (move-to-column fill-column) | |
307 | (if (and (re-search-forward "[^ ]" (line-end-position) 1) | |
308 | (> (current-column) fill-column)) | |
309 | ;; This line is too long. Can we break it? | |
310 | (or (longlines-find-break-backward) | |
311 | (progn (move-to-column fill-column) | |
312 | (longlines-find-break-forward))))) | |
313 | ||
314 | (defun longlines-find-break-backward () | |
315 | "Move point backward to the first available breakpoint and return t. | |
316 | If no breakpoint is found, return nil." | |
317 | (and (search-backward " " (line-beginning-position) 1) | |
318 | (save-excursion | |
319 | (skip-chars-backward " " (line-beginning-position)) | |
320 | (null (bolp))) | |
321 | (progn (forward-char 1) | |
322 | (if (and fill-nobreak-predicate | |
323 | (run-hook-with-args-until-success | |
324 | 'fill-nobreak-predicate)) | |
325 | (progn (skip-chars-backward " " (line-beginning-position)) | |
326 | (longlines-find-break-backward)) | |
327 | t)))) | |
328 | ||
329 | (defun longlines-find-break-forward () | |
330 | "Move point forward to the first available breakpoint and return t. | |
331 | If no break point is found, return nil." | |
332 | (and (search-forward " " (line-end-position) 1) | |
333 | (progn (skip-chars-forward " " (line-end-position)) | |
334 | (null (eolp))) | |
335 | (if (and fill-nobreak-predicate | |
336 | (run-hook-with-args-until-success | |
337 | 'fill-nobreak-predicate)) | |
338 | (longlines-find-break-forward) | |
339 | t))) | |
340 | ||
341 | (defun longlines-merge-lines-p () | |
342 | "Return t if part of the next line can fit onto the current line. | |
343 | Otherwise, return nil. Text cannot be moved across hard newlines." | |
344 | (save-excursion | |
345 | (end-of-line) | |
346 | (and (null (eobp)) | |
347 | (null (get-text-property (point) 'hard)) | |
348 | (let ((space (- fill-column (current-column)))) | |
349 | (forward-line 1) | |
350 | (if (eq (char-after) ? ) | |
351 | t ; We can always merge some spaces | |
352 | (<= (if (search-forward " " (line-end-position) 1) | |
353 | (current-column) | |
354 | (1+ (current-column))) | |
355 | space)))))) | |
356 | ||
0f157ad5 CY |
357 | (defun longlines-decode-region (&optional beg end) |
358 | "Turn all newlines between BEG and END into hard newlines. | |
359 | If BEG and END are nil, the point and mark are used." | |
360 | (if (null beg) (setq beg (point))) | |
361 | (if (null end) (setq end (mark t))) | |
cf6ffd8c | 362 | (save-excursion |
eb0d2864 CY |
363 | (let ((reg-max (max beg end))) |
364 | (goto-char (min beg end)) | |
365 | (while (search-forward "\n" reg-max t) | |
366 | (set-hard-newline-properties | |
367 | (match-beginning 0) (match-end 0)))))) | |
cf6ffd8c | 368 | |
2c127d45 CY |
369 | (defun longlines-decode-buffer () |
370 | "Turn all newlines in the buffer into hard newlines." | |
371 | (longlines-decode-region (point-min) (point-max))) | |
372 | ||
06b60517 | 373 | (defun longlines-encode-region (beg end &optional _buffer) |
cf6ffd8c RS |
374 | "Replace each soft newline between BEG and END with exactly one space. |
375 | Hard newlines are left intact. The optional argument BUFFER exists for | |
376 | compatibility with `format-alist', and is ignored." | |
377 | (save-excursion | |
eb0d2864 CY |
378 | (let ((reg-max (max beg end)) |
379 | (mod (buffer-modified-p))) | |
cf6ffd8c | 380 | (goto-char (min beg end)) |
eb0d2864 | 381 | (while (search-forward "\n" reg-max t) |
cf6ffd8c RS |
382 | (unless (get-text-property (match-beginning 0) 'hard) |
383 | (replace-match " "))) | |
384 | (set-buffer-modified-p mod) | |
385 | end))) | |
386 | ||
387 | (defun longlines-encode-string (string) | |
388 | "Return a copy of STRING with each soft newline replaced by a space. | |
389 | Hard newlines are left intact." | |
390 | (let* ((str (copy-sequence string)) | |
391 | (pos (string-match "\n" str))) | |
392 | (while pos | |
393 | (if (null (get-text-property pos 'hard str)) | |
394 | (aset str pos ? )) | |
395 | (setq pos (string-match "\n" str (1+ pos)))) | |
396 | str)) | |
397 | ||
398 | ;; Auto wrap | |
399 | ||
400 | (defun longlines-auto-wrap (&optional arg) | |
a1d155a4 CY |
401 | "Toggle automatic line wrapping. |
402 | With optional argument ARG, turn on line wrapping if and only if ARG is positive. | |
403 | If automatic line wrapping is turned on, wrap the entire buffer." | |
cf6ffd8c | 404 | (interactive "P") |
a1d155a4 CY |
405 | (setq arg (if arg |
406 | (> (prefix-numeric-value arg) 0) | |
407 | (not longlines-auto-wrap))) | |
cf6ffd8c | 408 | (if arg |
85a0b368 | 409 | (progn |
a1d155a4 CY |
410 | (setq longlines-auto-wrap t) |
411 | (longlines-wrap-region (point-min) (point-max)) | |
a1d155a4 CY |
412 | (message "Auto wrap enabled.")) |
413 | (setq longlines-auto-wrap nil) | |
414 | (message "Auto wrap disabled."))) | |
cf6ffd8c | 415 | |
06b60517 | 416 | (defun longlines-after-change-function (beg end _len) |
cf6ffd8c RS |
417 | "Update `longlines-wrap-beg' and `longlines-wrap-end'. |
418 | This is called by `after-change-functions' to keep track of the region | |
419 | that has changed." | |
a1d155a4 | 420 | (when (and longlines-auto-wrap (not undo-in-progress)) |
cf6ffd8c RS |
421 | (setq longlines-wrap-beg |
422 | (if longlines-wrap-beg (min longlines-wrap-beg beg) beg)) | |
423 | (setq longlines-wrap-end | |
424 | (if longlines-wrap-end (max longlines-wrap-end end) end)))) | |
425 | ||
426 | (defun longlines-post-command-function () | |
427 | "Perform line wrapping on the parts of the buffer that have changed. | |
428 | This is called by `post-command-hook' after each command." | |
a1d155a4 | 429 | (when (and longlines-auto-wrap longlines-wrap-beg) |
e17833bc CY |
430 | (if (or (eq this-command 'yank) |
431 | (eq this-command 'yank-pop)) | |
432 | (longlines-decode-region (point) (mark t))) | |
433 | (if longlines-showing | |
434 | (longlines-show-region longlines-wrap-beg longlines-wrap-end)) | |
cf6ffd8c RS |
435 | (unless (or (eq this-command 'fill-paragraph) |
436 | (eq this-command 'fill-region)) | |
437 | (longlines-wrap-region longlines-wrap-beg longlines-wrap-end)) | |
438 | (setq longlines-wrap-beg nil) | |
439 | (setq longlines-wrap-end nil))) | |
440 | ||
441 | (defun longlines-window-change-function () | |
442 | "Re-wrap the buffer if the window width has changed. | |
a3545af4 | 443 | This is called by `window-configuration-change-hook'." |
c455889d CY |
444 | (let ((dw (if (and (integerp longlines-wrap-follows-window-size) |
445 | (>= longlines-wrap-follows-window-size 0) | |
446 | (< longlines-wrap-follows-window-size (window-width))) | |
447 | longlines-wrap-follows-window-size | |
448 | 2))) | |
449 | (when (/= fill-column (- (window-width) dw)) | |
450 | (setq fill-column (- (window-width) dw)) | |
451 | (longlines-wrap-region (point-min) (point-max))))) | |
cf6ffd8c | 452 | |
930aae96 CY |
453 | ;; Isearch |
454 | ||
7f5bb182 | 455 | (defun longlines-search-function () |
930aae96 CY |
456 | (cond |
457 | (isearch-word | |
458 | (if isearch-forward 'word-search-forward 'word-search-backward)) | |
459 | (isearch-regexp | |
460 | (if isearch-forward 're-search-forward 're-search-backward)) | |
461 | (t | |
462 | (if isearch-forward | |
463 | 'longlines-search-forward | |
464 | 'longlines-search-backward)))) | |
465 | ||
466 | (defun longlines-search-forward (string &optional bound noerror count) | |
667adde1 | 467 | (let ((search-spaces-regexp " *[ \n]")) |
930aae96 CY |
468 | (re-search-forward (regexp-quote string) bound noerror count))) |
469 | ||
470 | (defun longlines-search-backward (string &optional bound noerror count) | |
667adde1 | 471 | (let ((search-spaces-regexp " *[ \n]")) |
930aae96 CY |
472 | (re-search-backward (regexp-quote string) bound noerror count))) |
473 | ||
e87085e6 | 474 | (defun longlines-re-search-forward (string &optional bound noerror count) |
667adde1 | 475 | (let ((search-spaces-regexp " *[ \n]")) |
e87085e6 CY |
476 | (re-search-forward string bound noerror count))) |
477 | ||
cf6ffd8c RS |
478 | ;; Loading and saving |
479 | ||
b39aa4fd CY |
480 | (defun longlines-before-revert-hook () |
481 | (add-hook 'after-revert-hook 'longlines-after-revert-hook nil t) | |
482 | (longlines-mode 0)) | |
483 | ||
484 | (defun longlines-after-revert-hook () | |
485 | (remove-hook 'after-revert-hook 'longlines-after-revert-hook t) | |
486 | (longlines-mode 1)) | |
487 | ||
cf6ffd8c RS |
488 | (add-to-list |
489 | 'format-alist | |
c613b39c | 490 | (list 'longlines "Automatically wrap long lines." nil nil |
b39aa4fd | 491 | 'longlines-encode-region t nil)) |
cf6ffd8c | 492 | |
c172e101 JB |
493 | ;; Unloading |
494 | ||
495 | (defun longlines-unload-function () | |
496 | "Unload the longlines library." | |
497 | (save-current-buffer | |
498 | (dolist (buffer (buffer-list)) | |
499 | (set-buffer buffer) | |
500 | (longlines-mode-off))) | |
501 | ;; continue standard unloading | |
502 | nil) | |
503 | ||
cf6ffd8c RS |
504 | (provide 'longlines) |
505 | ||
506 | ;;; longlines.el ends here |