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-;;; flow-fill.el --- interpret RFC2646 "flowed" text
-
-;; Copyright (C) 2000-2017 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 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
-
-;;; 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)))
-
-;;;###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))
- (save-restriction
- (narrow-to-region start end)
- (let ((fill-column (eval fill-flowed-encode-column)))
- (fill-flowed-fill-buffer))
- (goto-char (point-min))
- (while (re-search-forward "\n" nil t)
- (replace-match " \n" t t))
- (goto-char (setq start (1+ (point-max)))))))
- t)))
-
-(defun fill-flowed-fill-buffer ()
- (let ((prefix nil)
- (prev-prefix nil)
- (start (point-min)))
- (goto-char (point-min))
- (while (not (eobp))
- (setq prefix (and (looking-at "[> ]+")
- (match-string 0)))
- (if (equal prefix prev-prefix)
- (forward-line 1)
- (save-restriction
- (narrow-to-region start (point))
- (let ((fill-prefix prev-prefix))
- (fill-region (point-min) (point-max) t 'nosqueeze 'to-eop))
- (goto-char (point-max)))
- (setq prev-prefix prefix
- start (point))))
- (save-restriction
- (narrow-to-region start (point))
- (let ((fill-prefix prev-prefix))
- (fill-region (point-min) (point-max) t 'nosqueeze 'to-eop)))))
-
-;;;###autoload
-(defun fill-flowed (&optional buffer delete-space)
- (with-current-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)
- (when delete-space
- (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 (point-at-bol)
- (min (1+ (point-at-eol))
- (point-max))
- 'left 'nosqueeze))
- (error
- (forward-line 1)
- nil))))))))
-
-;; Test vectors.
-
-(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)
-
-;;; flow-fill.el ends here
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