1 ;;; flow-fill.el --- interprete RFC2646 "flowed" text
3 ;; Copyright (C) 2000 Free Software Foundation, Inc.
5 ;; Author: Simon Josefsson <jas@pdc.kth.se>
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
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.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
27 ;; This implement decoding of RFC2646 formatted text, including the
28 ;; quoted-depth wins rules.
30 ;; Theory of operation: search for lines ending with SPC, save quote
31 ;; length of line, remove SPC and concatenate line with the following
32 ;; line if quote length of following line matches current line.
34 ;; When no further concatenations are possible, we've found a
35 ;; paragraph and we let `fill-region' fill the long line into several
36 ;; lines with the quote prefix as `fill-prefix'.
42 ;; 2000-02-17 posted on ding mailing list
43 ;; 2000-02-19 use `point-at-{b,e}ol' in XEmacs
44 ;; 2000-03-11 no compile warnings for point-at-bol stuff
45 ;; 2000-03-26 commited to gnus cvs
50 (defalias 'fill-flowed-point-at-bol
51 (if (fboundp 'point-at-bol
)
53 'line-beginning-position
))
55 (defalias 'fill-flowed-point-at-eol
56 (if (fboundp 'point-at-eol
)
60 (defun fill-flowed (&optional buffer
)
62 (set-buffer (or (current-buffer) buffer
))
63 (goto-char (point-min))
64 (while (re-search-forward " $" nil t
)
67 (looking-at "^\\(>*\\)\\( ?\\)"))
68 (let ((quote (match-string 1)))
69 (if (string= quote
"")
71 (when (and quote
(string= (match-string 2) ""))
73 ;; insert SP after quote for pleasant reading of quoted lines
75 (when (> (skip-chars-forward ">") 0)
77 (while (and (save-excursion
79 (looking-at "[^-][^-] "))
84 (looking-at (format "^\\(%s\\)\\([^>]\\)" quote
))
85 (looking-at "^ ?")))))
87 (replace-match (if (string= (match-string 2) " ")
89 (backward-delete-char -
1)
91 (let ((fill-prefix (when quote
(concat quote
" "))))
92 (fill-region (fill-flowed-point-at-bol)
93 (fill-flowed-point-at-eol)
94 'left
'nosqueeze
)))))))
98 ;;; flow-fill.el ends here