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f4dd4ae8 | 1 | ;;; flow-fill.el --- interpret RFC2646 "flowed" text |
c113de23 | 2 | |
ba318903 | 3 | ;; Copyright (C) 2000-2014 Free Software Foundation, Inc. |
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4 | |
5 | ;; Author: Simon Josefsson <jas@pdc.kth.se> | |
6 | ;; Keywords: mail | |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
5e809f55 | 10 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
c113de23 | 11 | ;; it under the terms of the GNU General Public License as published by |
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12 | ;; the Free Software Foundation, either version 3 of the License, or |
13 | ;; (at your option) any later version. | |
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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 | |
5e809f55 | 21 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
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22 | |
23 | ;;; Commentary: | |
24 | ||
25 | ;; This implement decoding of RFC2646 formatted text, including the | |
26 | ;; quoted-depth wins rules. | |
27 | ||
28 | ;; Theory of operation: search for lines ending with SPC, save quote | |
29 | ;; length of line, remove SPC and concatenate line with the following | |
30 | ;; line if quote length of following line matches current line. | |
31 | ||
32 | ;; When no further concatenations are possible, we've found a | |
33 | ;; paragraph and we let `fill-region' fill the long line into several | |
34 | ;; lines with the quote prefix as `fill-prefix'. | |
35 | ||
23f87bed | 36 | ;; Todo: implement basic `fill-region' (Emacs and XEmacs |
01b5d73b | 37 | ;; implementations differ..) |
c113de23 | 38 | |
23f87bed | 39 | ;;; History: |
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40 | |
41 | ;; 2000-02-17 posted on ding mailing list | |
42 | ;; 2000-02-19 use `point-at-{b,e}ol' in XEmacs | |
43 | ;; 2000-03-11 no compile warnings for point-at-bol stuff | |
8f688cb0 | 44 | ;; 2000-03-26 committed to gnus cvs |
01b5d73b DL |
45 | ;; 2000-10-23 don't flow "-- " lines, make "quote-depth wins" rule |
46 | ;; work when first line is at level 0. | |
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47 | ;; 2002-01-12 probably incomplete encoding support |
48 | ;; 2003-12-08 started working on test harness. | |
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49 | |
50 | ;;; Code: | |
51 | ||
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52 | (eval-when-compile (require 'cl)) |
53 | ||
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54 | (defcustom fill-flowed-display-column 'fill-column |
55 | "Column beyond which format=flowed lines are wrapped, when displayed. | |
56 | This can be a Lisp expression or an integer." | |
bf247b6e | 57 | :version "22.1" |
e79f14a4 | 58 | :group 'mime-display |
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59 | :type '(choice (const :tag "Standard `fill-column'" fill-column) |
60 | (const :tag "Fit Window" (- (window-width) 5)) | |
61 | (sexp) | |
62 | (integer))) | |
63 | ||
64 | (defcustom fill-flowed-encode-column 66 | |
65 | "Column beyond which format=flowed lines are wrapped, in outgoing messages. | |
66 | This can be a Lisp expression or an integer. | |
67 | RFC 2646 suggests 66 characters for readability." | |
bf247b6e | 68 | :version "22.1" |
e79f14a4 | 69 | :group 'mime-display |
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70 | :type '(choice (const :tag "Standard fill-column" fill-column) |
71 | (const :tag "RFC 2646 default (66)" 66) | |
72 | (sexp) | |
73 | (integer))) | |
74 | ||
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75 | ;;;###autoload |
76 | (defun fill-flowed-encode (&optional buffer) | |
77 | (with-current-buffer (or buffer (current-buffer)) | |
78 | ;; No point in doing this unless hard newlines is used. | |
79 | (when use-hard-newlines | |
80 | (let ((start (point-min)) end) | |
81 | ;; Go through each paragraph, filling it and adding SPC | |
82 | ;; as the last character on each line. | |
83 | (while (setq end (text-property-any start (point-max) 'hard 't)) | |
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84 | (save-restriction |
85 | (narrow-to-region start end) | |
86 | (let ((fill-column (eval fill-flowed-encode-column))) | |
87 | (fill-flowed-fill-buffer)) | |
88 | (goto-char (point-min)) | |
89 | (while (re-search-forward "\n" nil t) | |
90 | (replace-match " \n" t t)) | |
91 | (goto-char (setq start (1+ (point-max))))))) | |
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92 | t))) |
93 | ||
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94 | (defun fill-flowed-fill-buffer () |
95 | (let ((prefix nil) | |
96 | (prev-prefix nil) | |
97 | (start (point-min))) | |
98 | (goto-char (point-min)) | |
99 | (while (not (eobp)) | |
100 | (setq prefix (and (looking-at "[> ]+") | |
101 | (match-string 0))) | |
102 | (if (equal prefix prev-prefix) | |
103 | (forward-line 1) | |
104 | (save-restriction | |
105 | (narrow-to-region start (point)) | |
106 | (let ((fill-prefix prev-prefix)) | |
107 | (fill-region (point-min) (point-max) t 'nosqueeze 'to-eop)) | |
108 | (goto-char (point-max))) | |
109 | (setq prev-prefix prefix | |
110 | start (point)))) | |
111 | (save-restriction | |
112 | (narrow-to-region start (point)) | |
113 | (let ((fill-prefix prev-prefix)) | |
114 | (fill-region (point-min) (point-max) t 'nosqueeze 'to-eop))))) | |
115 | ||
23f87bed | 116 | ;;;###autoload |
01c52d31 | 117 | (defun fill-flowed (&optional buffer delete-space) |
20a673b2 | 118 | (with-current-buffer (or (current-buffer) buffer) |
c113de23 | 119 | (goto-char (point-min)) |
5f4264e5 | 120 | ;; Remove space stuffing. |
e4a89ccf | 121 | (while (re-search-forward "^\\( \\|>+ $\\)" nil t) |
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122 | (delete-char -1) |
123 | (forward-line 1)) | |
124 | (goto-char (point-min)) | |
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125 | (while (re-search-forward " $" nil t) |
126 | (when (save-excursion | |
127 | (beginning-of-line) | |
ba0226dd | 128 | (looking-at "^\\(>*\\)\\( ?\\)")) |
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129 | (let ((quote (match-string 1)) |
130 | sig) | |
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131 | (if (string= quote "") |
132 | (setq quote nil)) | |
133 | (when (and quote (string= (match-string 2) "")) | |
134 | (save-excursion | |
135 | ;; insert SP after quote for pleasant reading of quoted lines | |
136 | (beginning-of-line) | |
137 | (when (> (skip-chars-forward ">") 0) | |
138 | (insert " ")))) | |
23f87bed | 139 | ;; XXX slightly buggy handling of "-- " |
c113de23 | 140 | (while (and (save-excursion |
01b5d73b DL |
141 | (ignore-errors (backward-char 3)) |
142 | (setq sig (looking-at "-- ")) | |
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143 | (looking-at "[^-][^-] ")) |
144 | (save-excursion | |
145 | (unless (eobp) | |
146 | (forward-char 1) | |
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147 | (looking-at (format "^\\(%s\\)\\([^>\n\r]\\)" |
148 | (or quote " ?")))))) | |
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149 | (save-excursion |
150 | (replace-match (if (string= (match-string 2) " ") | |
151 | "" "\\2"))) | |
152 | (backward-delete-char -1) | |
9e928ac9 G |
153 | (when delete-space |
154 | (delete-char -1)) | |
c113de23 | 155 | (end-of-line)) |
01b5d73b | 156 | (unless sig |
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157 | (condition-case nil |
158 | (let ((fill-prefix (when quote (concat quote " "))) | |
159 | (fill-column (eval fill-flowed-display-column)) | |
5f4264e5 MB |
160 | filladapt-mode |
161 | adaptive-fill-mode) | |
01c52d31 MB |
162 | (fill-region (point-at-bol) |
163 | (min (1+ (point-at-eol)) | |
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164 | (point-max)) |
165 | 'left 'nosqueeze)) | |
166 | (error | |
167 | (forward-line 1) | |
168 | nil)))))))) | |
169 | ||
170 | ;; Test vectors. | |
171 | ||
9efa445f | 172 | (defvar show-trailing-whitespace) |
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173 | |
174 | (defvar fill-flowed-encode-tests | |
3b059693 | 175 | `( |
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176 | ;; The syntax of each list element is: |
177 | ;; (INPUT . EXPECTED-OUTPUT) | |
3b059693 MB |
178 | (,(concat |
179 | "> Thou villainous ill-breeding spongy dizzy-eyed \n" | |
180 | "> reeky elf-skinned pigeon-egg! \n" | |
181 | ">> Thou artless swag-bellied milk-livered \n" | |
182 | ">> dismal-dreaming idle-headed scut!\n" | |
183 | ">>> Thou errant folly-fallen spleeny reeling-ripe \n" | |
184 | ">>> unmuzzled ratsbane!\n" | |
185 | ">>>> Henceforth, the coding style is to be strictly \n" | |
186 | ">>>> enforced, including the use of only upper case.\n" | |
187 | ">>>>> I've noticed a lack of adherence to the coding \n" | |
188 | ">>>>> styles, of late.\n" | |
189 | ">>>>>> Any complaints?") | |
190 | . | |
191 | ,(concat | |
192 | "> Thou villainous ill-breeding spongy dizzy-eyed reeky elf-skinned\n" | |
193 | "> pigeon-egg! \n" | |
194 | ">> Thou artless swag-bellied milk-livered dismal-dreaming idle-headed\n" | |
195 | ">> scut!\n" | |
196 | ">>> Thou errant folly-fallen spleeny reeling-ripe unmuzzled ratsbane!\n" | |
197 | ">>>> Henceforth, the coding style is to be strictly enforced,\n" | |
198 | ">>>> including the use of only upper case.\n" | |
199 | ">>>>> I've noticed a lack of adherence to the coding styles, of late.\n" | |
200 | ">>>>>> Any complaints?\n" | |
201 | )) | |
202 | ;; (,(concat | |
203 | ;; "\n" | |
204 | ;; "> foo\n" | |
205 | ;; "> \n" | |
206 | ;; "> \n" | |
207 | ;; "> bar\n") | |
208 | ;; . | |
209 | ;; ,(concat | |
210 | ;; "\n" | |
211 | ;; "> foo bar\n")) | |
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212 | )) |
213 | ||
214 | (defun fill-flowed-test () | |
215 | (interactive "") | |
216 | (switch-to-buffer (get-buffer-create "*Format=Flowed test output*")) | |
217 | (erase-buffer) | |
218 | (setq show-trailing-whitespace t) | |
219 | (dolist (test fill-flowed-encode-tests) | |
220 | (let (start output) | |
221 | (insert "***** BEGIN TEST INPUT *****\n") | |
222 | (insert (car test)) | |
223 | (insert "***** END TEST INPUT *****\n\n") | |
224 | (insert "***** BEGIN TEST OUTPUT *****\n") | |
225 | (setq start (point)) | |
226 | (insert (car test)) | |
227 | (save-restriction | |
228 | (narrow-to-region start (point)) | |
229 | (fill-flowed)) | |
230 | (setq output (buffer-substring start (point-max))) | |
231 | (insert "***** END TEST OUTPUT *****\n") | |
232 | (unless (string= output (cdr test)) | |
233 | (insert "\n***** BEGIN TEST EXPECTED OUTPUT *****\n") | |
234 | (insert (cdr test)) | |
235 | (insert "***** END TEST EXPECTED OUTPUT *****\n")) | |
236 | (insert "\n\n"))) | |
237 | (goto-char (point-max))) | |
c113de23 GM |
238 | |
239 | (provide 'flow-fill) | |
240 | ||
241 | ;;; flow-fill.el ends here |