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100 lines
3.6 KiB
EmacsLisp
100 lines
3.6 KiB
EmacsLisp
;;; hl-line.el --- highlight the current line
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;; Copyright (C) 1998, 2000 Free Software Foundation, Inc.
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;; Author: Dave Love <fx@gnu.org>
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;; Created: 1998-09-13
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;; Keywords: faces, frames, emulation
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; Provides a global minor mode (toggled by M-x hl-line-mode) to
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;; highlight, on a suitable terminal, the line in the current window
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;; on which point is (except in a minibuffer window). Done to satisfy
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;; a request for a feature of Lesser Editors.
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;; You probably don't really want this; if the cursor is difficult to
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;; spot, try changing its colour, relying on `blink-cursor-mode' or
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;; both. The hookery used might affect response noticeably on a slow
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;; machine.
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;; An overlay is used, active only on the selected window. Hooks are
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;; added to `pre-command-hook' and `post-command-hook' to activate and
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;; deactivate (by deleting) the overlay. `hl-line-unhighlight', on
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;; `pre-command-hook', deactivates it unconditionally in case the
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;; command changes the selected window. (It does so rather than
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;; keeping track of changes in the selected window).
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;; `hl-line-highlight', on `post-command-hook', activates it again
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;; across the window width.
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;; You could make variable `hl-line-mode' buffer-local to avoid
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;; highlighting specific buffers.
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;;; Code:
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(defgroup hl-line nil
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"Highlight the current line."
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:version "21.1"
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:group 'editing)
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(defcustom hl-line-face 'highlight
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"Face with which to highlight the current line."
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:type 'face
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:group 'hl-line)
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(defvar hl-line-overlay nil)
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(defun hl-line-highlight ()
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"Active the Hl-Line overlay on the current line in the current window.
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\(Unless it's a minibuffer window.)"
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(when hl-line-mode ; Could be made buffer-local.
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(unless (window-minibuffer-p (selected-window)) ; silly in minibuffer
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(unless hl-line-overlay
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(setq hl-line-overlay (make-overlay 1 1)) ; to be moved
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(overlay-put hl-line-overlay 'face hl-line-face))
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(overlay-put hl-line-overlay 'window (selected-window))
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(move-overlay hl-line-overlay
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(line-beginning-position) (1+ (line-end-position))
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(current-buffer)))))
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(defun hl-line-unhighlight ()
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"Deactivate the Hl-Line overlay on the current line in the current window."
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(if hl-line-overlay
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(delete-overlay hl-line-overlay)))
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;;;###autoload
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(define-minor-mode hl-line-mode
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"Global minor mode to highlight the line about point in the current window.
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With ARG, turn Hl-Line mode on if ARG is positive, off otherwise.
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Uses functions `hl-line-unhighlight' and `hl-line-highlight' on
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`pre-command-hook' and `post-command-hook'."
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:global t
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(if hl-line-mode
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(progn
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(add-hook 'pre-command-hook #'hl-line-unhighlight)
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(add-hook 'post-command-hook #'hl-line-highlight))
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(hl-line-unhighlight)
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(remove-hook 'pre-command-hook #'hl-line-unhighlight)
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(remove-hook 'post-command-hook #'hl-line-highlight)))
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(provide 'hl-line)
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;;; hl-line.el ends here
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