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emacs/lisp/gnus/flow-fill.el
Dave Love 01b5d73b79 2000-10-26 Dave Love <fx@gnu.org>
* flow-fill.el: Require cl when compiling.

2000-10-26  Simon Josefsson  <simon@josefsson.org>

	* flow-fill.el (fill-flowed): Don't flow "-- " lines.
	(fill-flowed): Make "quote-depth wins" rule work when first line
	is at level 0.
2000-10-26 18:12:28 +00:00

104 lines
3.3 KiB
EmacsLisp

;;; flow-fill.el --- interprete RFC2646 "flowed" text
;; Copyright (C) 2000 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 2, 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., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, 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: encoding, 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 commited to gnus cvs
;; 2000-10-23 don't flow "-- " lines, make "quote-depth wins" rule
;; work when first line is at level 0.
;;; Code:
(eval-when-compile (require 'cl))
(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)))
(defun fill-flowed (&optional buffer)
(save-excursion
(set-buffer (or (current-buffer) buffer))
(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 " "))))
(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\\)\\([^>]\\)" (or quote " ?"))))))
(save-excursion
(replace-match (if (string= (match-string 2) " ")
"" "\\2")))
(backward-delete-char -1)
(end-of-line))
(unless sig
(let ((fill-prefix (when quote (concat quote " "))))
(fill-region (fill-flowed-point-at-bol)
(fill-flowed-point-at-eol)
'left 'nosqueeze))))))))
(provide 'flow-fill)
;;; flow-fill.el ends here