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01b5d73b79
* 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.
104 lines
3.3 KiB
EmacsLisp
104 lines
3.3 KiB
EmacsLisp
;;; flow-fill.el --- interprete RFC2646 "flowed" text
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;; Copyright (C) 2000 Free Software Foundation, Inc.
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;; Author: Simon Josefsson <jas@pdc.kth.se>
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;; Keywords: mail
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This implement decoding of RFC2646 formatted text, including the
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;; quoted-depth wins rules.
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;; Theory of operation: search for lines ending with SPC, save quote
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;; length of line, remove SPC and concatenate line with the following
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;; line if quote length of following line matches current line.
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;; When no further concatenations are possible, we've found a
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;; paragraph and we let `fill-region' fill the long line into several
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;; lines with the quote prefix as `fill-prefix'.
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;; Todo: encoding, implement basic `fill-region' (Emacs and XEmacs
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;; implementations differ..)
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;; History:
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;; 2000-02-17 posted on ding mailing list
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;; 2000-02-19 use `point-at-{b,e}ol' in XEmacs
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;; 2000-03-11 no compile warnings for point-at-bol stuff
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;; 2000-03-26 commited to gnus cvs
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;; 2000-10-23 don't flow "-- " lines, make "quote-depth wins" rule
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;; work when first line is at level 0.
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;;; Code:
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(eval-when-compile (require 'cl))
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(eval-and-compile
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(defalias 'fill-flowed-point-at-bol
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(if (fboundp 'point-at-bol)
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'point-at-bol
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'line-beginning-position))
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(defalias 'fill-flowed-point-at-eol
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(if (fboundp 'point-at-eol)
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'point-at-eol
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'line-end-position)))
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(defun fill-flowed (&optional buffer)
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(save-excursion
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(set-buffer (or (current-buffer) buffer))
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(goto-char (point-min))
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(while (re-search-forward " $" nil t)
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(when (save-excursion
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(beginning-of-line)
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(looking-at "^\\(>*\\)\\( ?\\)"))
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(let ((quote (match-string 1)) sig)
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(if (string= quote "")
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(setq quote nil))
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(when (and quote (string= (match-string 2) ""))
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(save-excursion
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;; insert SP after quote for pleasant reading of quoted lines
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(beginning-of-line)
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(when (> (skip-chars-forward ">") 0)
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(insert " "))))
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(while (and (save-excursion
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(ignore-errors (backward-char 3))
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(setq sig (looking-at "-- "))
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(looking-at "[^-][^-] "))
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(save-excursion
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(unless (eobp)
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(forward-char 1)
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(looking-at (format "^\\(%s\\)\\([^>]\\)" (or quote " ?"))))))
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(save-excursion
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(replace-match (if (string= (match-string 2) " ")
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"" "\\2")))
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(backward-delete-char -1)
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(end-of-line))
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(unless sig
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(let ((fill-prefix (when quote (concat quote " "))))
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(fill-region (fill-flowed-point-at-bol)
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(fill-flowed-point-at-eol)
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'left 'nosqueeze))))))))
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(provide 'flow-fill)
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;;; flow-fill.el ends here
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