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;;; flow-fill.el --- interpret RFC2646 "flowed" text
;; Copyright (C) 2000, 2001, 2002, 2003 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., 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))
(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)
(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)
("> Thou villainous ill-breeding spongy dizzy-eyed
> reeky elf-skinned pigeon-egg!
>> Thou artless swag-bellied milk-livered
>> dismal-dreaming idle-headed scut!
>>> Thou errant folly-fallen spleeny reeling-ripe
>>> unmuzzled ratsbane!
>>>> Henceforth, the coding style is to be strictly
>>>> enforced, including the use of only upper case.
>>>>> I've noticed a lack of adherence to the coding
>>>>> styles, of late.
>>>>>> Any complaints?
" . "> Thou villainous ill-breeding spongy dizzy-eyed reeky elf-skinned
> pigeon-egg!
>> Thou artless swag-bellied milk-livered dismal-dreaming idle-headed
>> scut!
>>> Thou errant folly-fallen spleeny reeling-ripe unmuzzled ratsbane!
>>>> Henceforth, the coding style is to be strictly enforced,
>>>> including the use of only upper case.
>>>>> I've noticed a lack of adherence to the coding styles, of late.
>>>>>> Any complaints?
")
; ("
;> foo
;>
;>
;> bar
;" . "
;> foo bar
;")
))
(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
|
