code.delx.au - gnu-emacs-elpa/blob - 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 ;; This package provides the `adaptive-wrap-prefix-mode' minor mode which sets
  25 ;; the wrap-prefix property on the fly so that single-long-line paragraphs get
  26 ;; word-wrapped in a way similar to what you'd get with M-q using
  27 ;; adaptive-fill-mode, but without actually changing the buffer's text.
  28
  29 ;;; Code:
  30
  31 (defun adaptive-wrap-prefix-function (beg end)
  32   "Indent the region between BEG and END with adaptive filling."
  33   (goto-char beg)
  34   (while (< (point) end)
  35     (let ((blp (line-beginning-position)))
  36       (put-text-property (point)
  37                          (progn (search-forward "\n" end 'move) (point))
  38                          'wrap-prefix
  39                          (fill-context-prefix blp (point))))))
  40
  41 ;;;###autoload
  42 (define-minor-mode adaptive-wrap-prefix-mode
  43   "Wrap the buffer text with adaptive filling."
  44   :lighter ""
  45   (if adaptive-wrap-prefix-mode
  46       (jit-lock-register #'adaptive-wrap-prefix-function)
  47     (jit-lock-unregister #'adaptive-wrap-prefix-function)
  48     (with-silent-modifications
  49       (save-restriction
  50         (widen)
  51         (remove-text-properties (point-min) (point-max) '(wrap-prefix nil))))))
  52
  53
  54 (provide 'adaptive-wrap-prefix)
  55 ;;; adaptive-wrap-prefix.el ends here