1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
;;; flow-fill.el --- interpret RFC2646 "flowed" text
;; Copyright (C) 2000, 2001, 2002, 2003, 2004,
;; 2005, 2006, 2007 Free Software Foundation, Inc.
;; Author: Simon Josefsson <jas@pdc.kth.se>
;; Keywords: mail
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; This implement decoding of RFC2646 formatted text, including the
;; quoted-depth wins rules.
;; Theory of operation: search for lines ending with SPC, save quote
;; length of line, remove SPC and concatenate line with the following
;; line if quote length of following line matches current line.
;; When no further concatenations are possible, we've found a
;; paragraph and we let `fill-region' fill the long line into several
;; lines with the quote prefix as `fill-prefix'.
;; Todo: implement basic `fill-region' (Emacs and XEmacs
;; implementations differ..)
;;; History:
;; 2000-02-17 posted on ding mailing list
;; 2000-02-19 use `point-at-{b,e}ol' in XEmacs
;; 2000-03-11 no compile warnings for point-at-bol stuff
;; 2000-03-26 committed to gnus cvs
;; 2000-10-23 don't flow "-- " lines, make "quote-depth wins" rule
;; work when first line is at level 0.
;; 2002-01-12 probably incomplete encoding support
;; 2003-12-08 started working on test harness.
;;; Code:
(eval-when-compile (require 'cl))
(defcustom fill-flowed-display-column 'fill-column
"Column beyond which format=flowed lines are wrapped, when displayed.
This can be a Lisp expression or an integer."
:version "22.1"
:group 'mime-display
:type '(choice (const :tag "Standard `fill-column'" fill-column)
(const :tag "Fit Window" (- (window-width) 5))
(sexp)
(integer)))
(defcustom fill-flowed-encode-column 66
"Column beyond which format=flowed lines are wrapped, in outgoing messages.
This can be a Lisp expression or an integer.
RFC 2646 suggests 66 characters for readability."
:version "22.1"
:group 'mime-display
:type '(choice (const :tag "Standard fill-column" fill-column)
(const :tag "RFC 2646 default (66)" 66)
(sexp)
(integer)))
(eval-and-compile
(defalias 'fill-flowed-point-at-bol
(if (fboundp 'point-at-bol)
'point-at-bol
'line-beginning-position))
(defalias 'fill-flowed-point-at-eol
(if (fboundp 'point-at-eol)
'point-at-eol
'line-end-position)))
;;;###autoload
(defun fill-flowed-encode (&optional buffer)
(with-current-buffer (or buffer (current-buffer))
;; No point in doing this unless hard newlines is used.
(when use-hard-newlines
(let ((start (point-min)) end)
;; Go through each paragraph, filling it and adding SPC
;; as the last character on each line.
(while (setq end (text-property-any start (point-max) 'hard 't))
(let ((fill-column (eval fill-flowed-encode-column)))
(fill-region start end t 'nosqueeze 'to-eop))
(goto-char start)
;; `fill-region' probably distorted end.
(setq end (text-property-any start (point-max) 'hard 't))
(while (and (< (point) end)
(re-search-forward "$" (1- end) t))
(insert " ")
(setq end (1+ end))
(forward-char))
(goto-char (setq start (1+ end)))))
t)))
;;;###autoload
(defun fill-flowed (&optional buffer)
(save-excursion
(set-buffer (or (current-buffer) buffer))
(goto-char (point-min))
;; Remove space stuffing.
(while (re-search-forward "^\\( \\|>+ $\\)" nil t)
(delete-char -1)
(forward-line 1))
(goto-char (point-min))
(while (re-search-forward " $" nil t)
(when (save-excursion
(beginning-of-line)
(looking-at "^\\(>*\\)\\( ?\\)"))
(let ((quote (match-string 1))
sig)
(if (string= quote "")
(setq quote nil))
(when (and quote (string= (match-string 2) ""))
(save-excursion
;; insert SP after quote for pleasant reading of quoted lines
(beginning-of-line)
(when (> (skip-chars-forward ">") 0)
(insert " "))))
;; XXX slightly buggy handling of "-- "
(while (and (save-excursion
(ignore-errors (backward-char 3))
(setq sig (looking-at "-- "))
(looking-at "[^-][^-] "))
(save-excursion
(unless (eobp)
(forward-char 1)
(looking-at (format "^\\(%s\\)\\([^>\n\r]\\)"
(or quote " ?"))))))
(save-excursion
(replace-match (if (string= (match-string 2) " ")
"" "\\2")))
(backward-delete-char -1)
(end-of-line))
(unless sig
(condition-case nil
(let ((fill-prefix (when quote (concat quote " ")))
(fill-column (eval fill-flowed-display-column))
filladapt-mode
adaptive-fill-mode)
(fill-region (fill-flowed-point-at-bol)
(min (1+ (fill-flowed-point-at-eol))
(point-max))
'left 'nosqueeze))
(error
(forward-line 1)
nil))))))))
;; Test vectors.
(eval-when-compile
(defvar show-trailing-whitespace))
(defvar fill-flowed-encode-tests
`(
;; The syntax of each list element is:
;; (INPUT . EXPECTED-OUTPUT)
(,(concat
"> Thou villainous ill-breeding spongy dizzy-eyed \n"
"> reeky elf-skinned pigeon-egg! \n"
">> Thou artless swag-bellied milk-livered \n"
">> dismal-dreaming idle-headed scut!\n"
">>> Thou errant folly-fallen spleeny reeling-ripe \n"
">>> unmuzzled ratsbane!\n"
">>>> Henceforth, the coding style is to be strictly \n"
">>>> enforced, including the use of only upper case.\n"
">>>>> I've noticed a lack of adherence to the coding \n"
">>>>> styles, of late.\n"
">>>>>> Any complaints?")
.
,(concat
"> Thou villainous ill-breeding spongy dizzy-eyed reeky elf-skinned\n"
"> pigeon-egg! \n"
">> Thou artless swag-bellied milk-livered dismal-dreaming idle-headed\n"
">> scut!\n"
">>> Thou errant folly-fallen spleeny reeling-ripe unmuzzled ratsbane!\n"
">>>> Henceforth, the coding style is to be strictly enforced,\n"
">>>> including the use of only upper case.\n"
">>>>> I've noticed a lack of adherence to the coding styles, of late.\n"
">>>>>> Any complaints?\n"
))
;; (,(concat
;; "\n"
;; "> foo\n"
;; "> \n"
;; "> \n"
;; "> bar\n")
;; .
;; ,(concat
;; "\n"
;; "> foo bar\n"))
))
(defun fill-flowed-test ()
(interactive "")
(switch-to-buffer (get-buffer-create "*Format=Flowed test output*"))
(erase-buffer)
(setq show-trailing-whitespace t)
(dolist (test fill-flowed-encode-tests)
(let (start output)
(insert "***** BEGIN TEST INPUT *****\n")
(insert (car test))
(insert "***** END TEST INPUT *****\n\n")
(insert "***** BEGIN TEST OUTPUT *****\n")
(setq start (point))
(insert (car test))
(save-restriction
(narrow-to-region start (point))
(fill-flowed))
(setq output (buffer-substring start (point-max)))
(insert "***** END TEST OUTPUT *****\n")
(unless (string= output (cdr test))
(insert "\n***** BEGIN TEST EXPECTED OUTPUT *****\n")
(insert (cdr test))
(insert "***** END TEST EXPECTED OUTPUT *****\n"))
(insert "\n\n")))
(goto-char (point-max)))
(provide 'flow-fill)
;;; arch-tag: addc0040-bc53-4f17-b4bc-1eb44eed6f0b
;;; flow-fill.el ends here
|
