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1 | ;;; refill.el --- `auto-fill' by refilling paragraphs on changes |
2 | ||
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3 | ;; Copyright (C) 2000, 2002, 2003, 2004, 2005, |
4 | ;; 2006 Free Software Foundation, Inc. | |
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5 | |
6 | ;; Author: Dave Love <fx@gnu.org> | |
a2515a78 | 7 | ;; Maintainer: Miles Bader <miles@gnu.org> |
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8 | ;; Keywords: wp |
9 | ||
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10 | ;; This file is part of GNU Emacs. |
11 | ||
12 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
aaaf7be7 | 13 | ;; it under the terms of the GNU General Public License as published by |
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14 | ;; the Free Software Foundation; either version 2, or (at your option) |
15 | ;; any later version. | |
16 | ||
17 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
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18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;; GNU General Public License for more details. | |
2be7dabc | 21 | |
aaaf7be7 | 22 | ;; You should have received a copy of the GNU General Public License |
2be7dabc | 23 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
4fc5845f LK |
24 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
25 | ;; Boston, MA 02110-1301, USA. | |
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26 | |
27 | ;;; Commentary: | |
28 | ||
29 | ;; Provides a mode where paragraphs are refilled after changes in them | |
7850e188 | 30 | ;; (using `after-change-functions'). This gives something akin to typical |
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31 | ;; word processor-style filling. We restrict refilling due to |
32 | ;; self-insertion to the characters which trigger auto-fill. | |
33 | ||
34 | ;; It partly satisfies a todo item in enriched.el for some value of | |
35 | ;; `without slowing down editing too much'. It doesn't attempt to do | |
36 | ;; anything (using `window-size-change-functions'?) about resizing | |
37 | ;; windows -- who cares? | |
38 | ||
39 | ;; This implementation is probably fragile and missing some special | |
40 | ;; cases -- not extensively tested. Yanking paragraph breaks, for | |
41 | ;; instance, won't DTRT by refilling all the relevant paragraphs. | |
42 | ||
43 | ;; You could do it a bit more efficiently (and robustly?) with just an | |
44 | ;; auto-fill function, but that doesn't cope with changes other than | |
45 | ;; through self-insertion. (Using auto-fill and after-change | |
46 | ;; functions together didn't seem winning.) This could probably | |
47 | ;; benefit from a less-general and faster `fill-paragraph-function', | |
48 | ;; ideally as a primitive. | |
49 | ||
50 | ;; The work is done in a local post-command hook but only if | |
51 | ;; `refill-doit' has been set by the after-change function. Using | |
7850e188 | 52 | ;; `post-command-hook' ensures simply that refilling only happens |
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53 | ;; once per command. |
54 | ||
55 | ;; [Per Abrahamsen's maniac.el does a similar thing, but operates from | |
56 | ;; post-command-hook. I don't understand the statement in it that | |
7850e188 | 57 | ;; after-change-functions don't work for this purpose; perhaps there was |
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58 | ;; some Emacs bug at the time. ISTR maniac has problems with |
59 | ;; whitespace at the end of paragraphs.] | |
60 | ||
d1a27f1d SM |
61 | ;;; Todo/Bugs: |
62 | ||
63 | ;; - When deleting the first word on a line, the space after that word tends | |
64 | ;; to become part of the fill-prefix, causing either wrong filling of the | |
65 | ;; remaining text, or causing the cursor to move unexpectedly. Ex: | |
66 | ;; Start with | |
67 | ;; I>< blabla | |
68 | ;; | |
69 | ;; and hit backspace. We end up with | |
70 | ;; | |
71 | ;; ><blabla | |
72 | ;; instead of | |
73 | ;; >< blabla | |
74 | ;; | |
75 | ;; Other example. Start with | |
76 | ;; | |
77 | ;; Foo bar blablabla asdgf | |
78 | ;; word>< asdfas dfasdfasd | |
79 | ;; asd asdfa sdfasd sdf | |
80 | ;; | |
81 | ;; and hit M-backspace. We end up with | |
82 | ;; | |
83 | ;; Foo bar blablabla asdgf | |
84 | ;; ><asdfas dfasdfasd asd | |
85 | ;; asdfa sdfasd sdf | |
86 | ||
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87 | ;;; Code: |
88 | ||
04138be8 SM |
89 | (eval-when-compile (require 'cl)) |
90 | ||
e4caa91a MR |
91 | (defgroup refill nil |
92 | "Refilling paragraphs on changes." | |
93 | :group 'fill) | |
94 | ||
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95 | (defvar refill-ignorable-overlay nil |
96 | "Portion of the most recently filled paragraph not needing filling. | |
97 | This is used to optimize refilling.") | |
98 | (make-variable-buffer-local 'refill-ignorable-overlay) | |
99 | ||
100 | (defun refill-adjust-ignorable-overlay (overlay afterp beg end &optional len) | |
101 | "Adjust OVERLAY to not include the about-to-be-modified region." | |
102 | (when (not afterp) | |
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103 | (save-excursion |
104 | (goto-char beg) | |
105 | (forward-line -1) | |
106 | (if (<= (point) (overlay-start overlay)) | |
107 | ;; Just get OVERLAY out of the way | |
ad2feb08 | 108 | (move-overlay overlay (point-min) (point-min)) |
db95369b | 109 | ;; Make overlay contain only the region |
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110 | (move-overlay overlay (overlay-start overlay) (point)))))) |
111 | ||
112 | (defun refill-fill-paragraph-at (pos &optional arg) | |
113 | "Like `fill-paragraph' at POS, but don't delete whitespace at paragraph end." | |
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114 | (save-excursion |
115 | (goto-char pos) | |
116 | ;; FIXME: forward-paragraph seems to disregard `use-hard-newlines', | |
117 | ;; leading to excessive refilling and wrong choice of fill-prefix. | |
118 | ;; might be a bug in my paragraphs.el. | |
119 | (forward-paragraph) | |
120 | (skip-syntax-backward "-") | |
121 | (let ((end (point)) | |
122 | (beg (progn (backward-paragraph) (point))) | |
123 | (obeg (overlay-start refill-ignorable-overlay)) | |
124 | (oend (overlay-end refill-ignorable-overlay))) | |
125 | (unless (> beg pos) ;Don't fill if point is outside the paragraph. | |
126 | (goto-char pos) | |
127 | (if (and (>= beg obeg) (< beg oend)) | |
128 | ;; Limit filling to the modified tail of the paragraph. | |
129 | (let ( ;; When adaptive-fill-mode is enabled, the filling | |
130 | ;; functions will attempt to set the fill prefix from | |
131 | ;; the fake paragraph bounds we pass in, so set it | |
132 | ;; ourselves first, using the real paragraph bounds. | |
133 | (fill-prefix | |
134 | (if (and adaptive-fill-mode | |
135 | (or (null fill-prefix) (string= fill-prefix ""))) | |
136 | (fill-context-prefix beg end) | |
137 | fill-prefix)) | |
138 | ;; Turn off adaptive-fill-mode temporarily | |
139 | (adaptive-fill-mode nil)) | |
140 | (save-restriction | |
141 | (if use-hard-newlines | |
142 | (fill-region oend end arg) | |
143 | (fill-region-as-paragraph oend end arg))) | |
144 | (move-overlay refill-ignorable-overlay obeg (point))) | |
145 | ;; Fill the whole paragraph | |
146 | (save-restriction | |
147 | (if use-hard-newlines | |
148 | (fill-region beg end arg) | |
149 | (fill-region-as-paragraph beg end arg))) | |
150 | (move-overlay refill-ignorable-overlay beg (point))))))) | |
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151 | |
152 | (defun refill-fill-paragraph (arg) | |
153 | "Like `fill-paragraph' but don't delete whitespace at paragraph end." | |
154 | (refill-fill-paragraph-at (point) arg)) | |
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155 | |
156 | (defvar refill-doit nil | |
8b4703c4 | 157 | "Non-nil tells `refill-post-command-function' to do its processing. |
7850e188 | 158 | Set by `refill-after-change-function' in `after-change-functions' and |
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159 | unset by `refill-post-command-function' in `post-command-hook', and |
160 | sometimes `refill-pre-command-function' in `pre-command-hook'. This | |
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161 | ensures refilling is only done once per command that causes a change, |
162 | regardless of the number of after-change calls from commands doing | |
163 | complex processing.") | |
164 | (make-variable-buffer-local 'refill-doit) | |
165 | ||
166 | (defun refill-after-change-function (beg end len) | |
167 | "Function for `after-change-functions' which just sets `refill-doit'." | |
168 | (unless undo-in-progress | |
867092e9 | 169 | (setq refill-doit end))) |
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170 | |
171 | (defun refill-post-command-function () | |
172 | "Post-command function to do refilling (conditionally)." | |
867092e9 | 173 | (when refill-doit ; there was a change |
aaaf7be7 | 174 | ;; There's probably scope for more special cases here... |
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175 | (case this-command |
176 | (self-insert-command | |
177 | ;; Treat self-insertion commands specially, since they don't | |
178 | ;; always reset `refill-doit' -- for self-insertion commands that | |
179 | ;; *don't* cause a refill, we want to leave it turned on so that | |
180 | ;; any subsequent non-modification command will cause a refill. | |
181 | (when (aref auto-fill-chars (char-before)) | |
182 | ;; Respond to the same characters as auto-fill (other than | |
183 | ;; newline, covered below). | |
184 | (refill-fill-paragraph-at refill-doit) | |
185 | (setq refill-doit nil))) | |
186 | ((quoted-insert fill-paragraph fill-region) nil) | |
187 | ((newline newline-and-indent open-line indent-new-comment-line | |
188 | reindent-then-newline-and-indent) | |
189 | ;; Don't zap what was just inserted. | |
190 | (save-excursion | |
191 | (beginning-of-line) ; for newline-and-indent | |
192 | (skip-chars-backward "\n") | |
193 | (save-restriction | |
194 | (narrow-to-region (point-min) (point)) | |
195 | (refill-fill-paragraph-at refill-doit))) | |
196 | (widen) | |
197 | (save-excursion | |
198 | (skip-chars-forward "\n") | |
199 | (save-restriction | |
200 | (narrow-to-region (line-beginning-position) (point-max)) | |
201 | (refill-fill-paragraph-at refill-doit)))) | |
202 | (t | |
203 | (refill-fill-paragraph-at refill-doit))) | |
204 | (setq refill-doit nil))) | |
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205 | |
206 | (defun refill-pre-command-function () | |
207 | "Pre-command function to do refilling (conditionally)." | |
208 | (when (and refill-doit (not (eq this-command 'self-insert-command))) | |
209 | ;; A previous setting of `refill-doit' didn't result in a refill, | |
210 | ;; because it was a self-insert-command. Since the next command is | |
211 | ;; something else, do the refill now. | |
212 | (refill-fill-paragraph-at refill-doit) | |
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213 | (setq refill-doit nil))) |
214 | ||
04138be8 | 215 | (defvar refill-saved-state nil) |
10ee3d79 | 216 | |
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217 | ;;;###autoload |
218 | (define-minor-mode refill-mode | |
219 | "Toggle Refill minor mode. | |
220 | With prefix arg, turn Refill mode on iff arg is positive. | |
221 | ||
222 | When Refill mode is on, the current paragraph will be formatted when | |
223 | changes are made within it. Self-inserting characters only cause | |
224 | refilling if they would cause auto-filling." | |
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225 | :group 'refill |
226 | :lighter " Refill" | |
227 | :keymap '(("\177" . backward-delete-char-untabify)) | |
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228 | ;; Remove old state if necessary |
229 | (when refill-ignorable-overlay | |
230 | (delete-overlay refill-ignorable-overlay) | |
231 | (kill-local-variable 'refill-ignorable-overlay)) | |
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232 | (when (local-variable-p 'refill-saved-state) |
233 | (dolist (x refill-saved-state) | |
234 | (set (make-local-variable (car x)) (cdr x))) | |
235 | (kill-local-variable 'refill-saved-state)) | |
aaaf7be7 | 236 | (if refill-mode |
7850e188 SM |
237 | (progn |
238 | (add-hook 'after-change-functions 'refill-after-change-function nil t) | |
239 | (add-hook 'post-command-hook 'refill-post-command-function nil t) | |
867092e9 | 240 | (add-hook 'pre-command-hook 'refill-pre-command-function nil t) |
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241 | (set (make-local-variable 'refill-saved-state) |
242 | (mapcar (lambda (s) (cons s (symbol-value s))) | |
243 | '(fill-paragraph-function auto-fill-function))) | |
f5bd4bf2 | 244 | ;; This provides the test for recursive paragraph filling. |
7850e188 SM |
245 | (set (make-local-variable 'fill-paragraph-function) |
246 | 'refill-fill-paragraph) | |
d1a27f1d SM |
247 | ;; When using justification, doing DEL on 2 spaces should remove |
248 | ;; both, otherwise, the subsequent refill will undo the DEL. | |
249 | (set (make-local-variable 'backward-delete-char-untabify-method) | |
250 | 'hungry) | |
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251 | (setq refill-ignorable-overlay (make-overlay 1 1 nil nil t)) |
252 | (overlay-put refill-ignorable-overlay 'modification-hooks | |
253 | '(refill-adjust-ignorable-overlay)) | |
254 | (overlay-put refill-ignorable-overlay 'insert-behind-hooks | |
255 | '(refill-adjust-ignorable-overlay)) | |
7850e188 | 256 | (auto-fill-mode 0)) |
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257 | (remove-hook 'after-change-functions 'refill-after-change-function t) |
258 | (remove-hook 'post-command-hook 'refill-post-command-function t) | |
d1a27f1d | 259 | (kill-local-variable 'backward-delete-char-untabify-method))) |
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260 | |
261 | (provide 'refill) | |
262 | ||
04138be8 | 263 | ;; arch-tag: 2c4ce9e8-1daa-4a3b-b6f8-fd6ac5bf6138 |
aaaf7be7 | 264 | ;;; refill.el ends here |