packages/adaptive-wrap-prefix/adaptive-wrap-prefix.el

   1 ;;; adaptive-wrap-prefix.el --- Perform smart line-wrapping with wrap-prefix
   2
   3 ;; Copyright (C) 2011  Stefan Monnier
   4
   5 ;; Author: Stephen Berman <stephen.berman@gmx.net>
   6 ;;         Stefan Monnier <monnier@iro.umontreal.ca>
   7 ;; Version: 0.1
   8
   9 ;; This program is free software; you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation, either version 3 of the License, or
  12 ;; (at your option) any later version.
  13
  14 ;; This program is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Commentary:
  23
  24 ;; Set the wrap-prefix property on the fly so that single-long-line paragraphs
  25 ;; get word-wrapped in a way similar to what you'd get with M-q using
  26 ;; adaptive-fill-mode, but without actually changing the buffer's text.
  27
  28 ;;; Code:
  29
  30 (defun adaptive-wrap-prefix-function (beg end)
  31   "Indent the region between BEG and END with adaptive filling."
  32   (goto-char beg)
  33   (while (< (point) end)
  34     (let ((blp (line-beginning-position)))
  35       (put-text-property (point)
  36                          (progn (search-forward "\n" end 'move) (point))
  37                          'wrap-prefix
  38                          (fill-context-prefix blp (point))))))
  39
  40 ;;;###autoload
  41 (define-minor-mode adaptive-wrap-prefix-mode
  42   "Wrap the buffer text with adaptive filling."
  43   :lighter ""
  44   (if adaptive-wrap-prefix-mode
  45       (jit-lock-register #'adaptive-wrap-prefix-function)
  46     (jit-lock-unregister #'adaptive-wrap-prefix-function)
  47     (with-silent-modifications
  48       (save-restriction
  49         (widen)
  50         (remove-text-properties (point-min) (point-max) '(wrap-prefix nil))))))
  51
  52
  53 (provide 'adaptive-wrap-prefix)
  54 ;;; adaptive-wrap-prefix.el ends here