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|
;;; hl-sentence.el --- highlight a sentence based on customizable face
;; Copyright (c) 2011 Donald Ephraim Curtis
;; Author: Donald Ephraim Curtis <dcurtis@milkbox.net>
;; URL: http://github.com/milkypostman/hl-sentence
;; Version: 3
;; Keywords: highlighting
;; This file is not part of GNU Emacs.
;;; License:
;; This program 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.
;;
;; This program 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:
;;
;; Highlight the current sentence using `hl-sentence-face'.
;;
;; To use this package, add the following code to your `emacs-init-file'
;;
;; (require 'hl-sentence)
;; (add-hook 'YOUR-MODE-HOOK 'hl-sentence-mode)
;; (set-face-attribute 'hl-sentence-face nil
;; :foreground "#444")
;;
;; Please send bug reports to
;; https://github.com/milkypostman/hl-sentence/issues
;;
;; This mode started out as a bit of elisp at
;; http://www.emacswiki.org/emacs/SentenceHighlight by Aaron Hawley.
;;; Code:
(defgroup hl-sentence nil
"Highlight the current sentence."
:group 'convenience)
;;;###autoload
(defface hl-sentence-face
'((t))
"The face used to highlight the current sentence."
:group 'hl-sentence)
(defun hl-sentence-begin-pos ()
"Return the point of the beginning of a sentence."
(save-excursion
(unless (= (point) (point-max))
(forward-char))
(backward-sentence)
(point)))
(defun hl-sentence-end-pos ()
"Return the point of the end of a sentence."
(save-excursion
(unless (= (point) (point-max))
(forward-char))
(backward-sentence)
(forward-sentence)
(point)))
(defvar hl-sentence-extent nil
"The location of the hl-sentence-mode overlay.")
;;;###autoload
(define-minor-mode hl-sentence-mode
"Enable highlighting of currentent sentence."
:init-value nil
(progn
(if hl-sentence-mode
(add-hook 'post-command-hook 'hl-sentence-current nil t)
(move-overlay hl-sentence-extent 0 0 (current-buffer))
(remove-hook 'post-command-hook 'hl-sentence-current t))))
(defun hl-sentence-current ()
"Highlight current sentence."
(and hl-sentence-mode (> (buffer-size) 0)
(progn
(and (boundp 'hl-sentence-extent)
hl-sentence-extent
(move-overlay hl-sentence-extent
(hl-sentence-begin-pos)
(hl-sentence-end-pos)
(current-buffer))))))
(setq hl-sentence-extent (make-overlay 0 0))
(overlay-put hl-sentence-extent 'face 'hl-sentence-face)
(provide 'hl-sentence)
;;; hl-sentence.el ends here
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