mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-23 07:19:15 +00:00
107 lines
3.9 KiB
EmacsLisp
107 lines
3.9 KiB
EmacsLisp
;;; hl-line.el --- highlight the current line
|
|
|
|
;; Copyright (C) 1998, 2000, 2001 Free Software Foundation, Inc.
|
|
|
|
;; Author: Dave Love <fx@gnu.org>
|
|
;; Created: 1998-09-13
|
|
;; Keywords: faces, frames, emulation
|
|
|
|
;; 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 2, 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; see the file COPYING. If not, write to the
|
|
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
;; Boston, MA 02111-1307, USA.
|
|
|
|
;;; Commentary:
|
|
|
|
;; Provides a minor mode (toggled by M-x hl-line-mode) and a global minor
|
|
;; mode (toggled by M-x global-hl-line-mode) to highlight, on a
|
|
;; suitable terminal, the line in the current window on which point is
|
|
;; (except in a minibuffer window). Done to satisfy a request for a
|
|
;; feature of Lesser Editors.
|
|
|
|
;; You probably don't really want this; if the cursor is difficult to
|
|
;; spot, try changing its colour, relying on `blink-cursor-mode' or
|
|
;; both. The hookery used might affect response noticeably on a slow
|
|
;; machine. It may be useful in "non-text" buffers such as Gnus or
|
|
;; PCL-CVS though.
|
|
|
|
;; An overlay is used, active only on the selected window. Hooks are
|
|
;; added to `pre-command-hook' and `post-command-hook' to activate and
|
|
;; deactivate (by deleting) the overlay. `hl-line-unhighlight', on
|
|
;; `pre-command-hook', deactivates it unconditionally in case the
|
|
;; command changes the selected window. (It does so rather than
|
|
;; keeping track of changes in the selected window).
|
|
;; `hl-line-highlight', on `post-command-hook', activates it again
|
|
;; across the window width.
|
|
|
|
;; You could make variable `hl-line-mode' buffer-local to avoid
|
|
;; highlighting specific buffers, when the global mode is used.
|
|
|
|
;;; Code:
|
|
|
|
(defgroup hl-line nil
|
|
"Highlight the current line."
|
|
:version "21.1"
|
|
:group 'editing)
|
|
|
|
(defcustom hl-line-face 'highlight
|
|
"Face with which to highlight the current line."
|
|
:type 'face
|
|
:group 'hl-line)
|
|
|
|
(defvar hl-line-overlay nil)
|
|
|
|
;;;###autoload
|
|
(define-minor-mode hl-line-mode
|
|
"Minor mode to highlight the line about point in the current window.
|
|
With ARG, turn Hl-Line mode on if ARG is positive, off otherwise.
|
|
Uses functions `hl-line-unhighlight' and `hl-line-highlight' on
|
|
`pre-command-hook' and `post-command-hook'."
|
|
nil nil nil
|
|
(if hl-line-mode
|
|
(progn
|
|
(add-hook 'pre-command-hook #'hl-line-unhighlight)
|
|
(add-hook 'post-command-hook #'hl-line-highlight))
|
|
(hl-line-unhighlight)
|
|
(remove-hook 'pre-command-hook #'hl-line-unhighlight)
|
|
(remove-hook 'post-command-hook #'hl-line-highlight)))
|
|
|
|
;;;###autoload
|
|
(easy-mmode-define-global-mode
|
|
global-hl-line-mode hl-line-mode hl-line-mode
|
|
:group 'hl-line)
|
|
|
|
(defun hl-line-highlight ()
|
|
"Active the Hl-Line overlay on the current line in the current window.
|
|
\(Unless it's a minibuffer window.)"
|
|
(when hl-line-mode ; Could be made buffer-local.
|
|
(unless (window-minibuffer-p (selected-window)) ; silly in minibuffer
|
|
(unless hl-line-overlay
|
|
(setq hl-line-overlay (make-overlay 1 1)) ; to be moved
|
|
(overlay-put hl-line-overlay 'face hl-line-face))
|
|
(overlay-put hl-line-overlay 'window (selected-window))
|
|
(move-overlay hl-line-overlay
|
|
(line-beginning-position) (1+ (line-end-position))
|
|
(current-buffer)))))
|
|
|
|
(defun hl-line-unhighlight ()
|
|
"Deactivate the Hl-Line overlay on the current line in the current window."
|
|
(if hl-line-overlay
|
|
(delete-overlay hl-line-overlay)))
|
|
|
|
(provide 'hl-line)
|
|
|
|
;;; hl-line.el ends here
|