;;; hl-line.el --- highlight the current line
-;; Copyright (C) 1998, 2000, 2001 Free Software Foundation, Inc.
+;; Copyright (C) 1998, 2000, 2001, 2003 Free Software Foundation, Inc.
;; Author: Dave Love <fx@gnu.org>
;; Created: 1998-09-13
;;; 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.
+;; Provides a buffer-local 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 on which point is. The
+;; global mode highlights the current line in the selected window only
+;; (except when the minibuffer window is selected). This was
+;; implemented to satisfy a request for a feature of Lesser Editors.
+;; The local mode is sticky: it highlights the line about the buffer's
+;; point even if the buffer's window is not selected. Caveat: the
+;; buffer's point might be different from the point of a non-selected
+;; window. Set the variable `hl-line-sticky-flag' to nil to make the
+;; local mode behave like the global mode.
+
+;; You probably don't really want to use the global mode; 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. The local mode may be
+;; useful in non-editing buffers such as Gnus or PCL-CVS though.
+
+;; An overlay is used. In the non-sticky cases, this overlay is
+;; active only on the selected window. A hook is added to
+;; `post-command-hook' to activate the overlay and move it to the line
+;; about point. To get the non-sticky behavior, `hl-line-unhighlight'
+;; is added to `pre-command-hook' as well. This function deactivates
+;; the overlay unconditionally in case the command changes the
+;; selected window. (It does so rather than keeping track of changes
+;; in the selected window).
+
+;; You could make variable `global-hl-line-mode' buffer-local and set
+;; it to nil to avoid highlighting specific buffers, when the global
+;; mode is used.
;;; Code:
:type 'face
:group 'hl-line)
-(defvar hl-line-overlay nil)
+(defcustom hl-line-sticky-flag t
+ "*Non-nil means highlight the current line in all windows.
+Otherwise Hl-Line mode will highlight only in the selected
+window. Setting this variable takes effect the next time you use
+the command `hl-line-mode' to turn Hl-Line mode on."
+ :type 'boolean
+ :version "21.4"
+ :group 'hl-line)
+
+(defvar hl-line-overlay nil
+ "Overlay used by Hl-Line mode to highlight the current line.")
+(make-variable-buffer-local 'hl-line-overlay)
+
+(defvar global-hl-line-overlay nil
+ "Overlay used by Global-Hl-Line mode to highlight the current line.")
;;;###autoload
(define-minor-mode hl-line-mode
- "Minor mode to highlight the line about point in the current window.
+ "Buffer-local minor mode to highlight the line about point.
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'."
+
+If `hl-line-sticky-flag' is non-nil, Hl-Line mode highlights the
+line about the buffer's point in all windows. Caveat: the
+buffer's point might be different from the point of a
+non-selected window. Hl-Line mode uses the function
+`hl-line-highlight' on `post-command-hook' in this case.
+
+When `hl-line-sticky-flag' is nil, Hl-Line mode highlights the
+line about point in the selected window only. In this case, it
+uses the function `hl-line-unhighlight' on `pre-command-hook' in
+addition to `hl-line-highlight' on `post-command-hook'."
nil nil nil
(if hl-line-mode
(progn
- (add-hook 'pre-command-hook #'hl-line-unhighlight nil t)
+ ;; In case `kill-all-local-variables' is called.
+ (add-hook 'change-major-mode-hook #'hl-line-unhighlight nil t)
+ (if hl-line-sticky-flag
+ (remove-hook 'pre-command-hook #'hl-line-unhighlight t)
+ (add-hook 'pre-command-hook #'hl-line-unhighlight nil t))
+ (hl-line-highlight)
(add-hook 'post-command-hook #'hl-line-highlight nil t))
+ (remove-hook 'post-command-hook #'hl-line-highlight t)
(hl-line-unhighlight)
- (remove-hook 'pre-command-hook #'hl-line-unhighlight t)
- (remove-hook 'post-command-hook #'hl-line-highlight t)))
-
-;;;###autoload
-(easy-mmode-define-global-mode
- global-hl-line-mode hl-line-mode (lambda () (hl-line-mode 1))
- :group 'hl-line)
+ (remove-hook 'change-major-mode-hook #'hl-line-unhighlight t)
+ (remove-hook 'pre-command-hook #'hl-line-unhighlight t)))
(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 ; Might be changed outside the mode function.
- (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)))))
+ "Active the Hl-Line overlay on the current line."
+ (if hl-line-mode ; Might be changed outside the mode function.
+ (progn
+ (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 (unless hl-line-sticky-flag (selected-window)))
+ (move-overlay hl-line-overlay
+ (line-beginning-position) (1+ (line-end-position))))
+ (hl-line-unhighlight)))
(defun hl-line-unhighlight ()
- "Deactivate the Hl-Line overlay on the current line in the current window."
+ "Deactivate the Hl-Line overlay on the current line."
(if hl-line-overlay
(delete-overlay hl-line-overlay)))
+;;;###autoload
+(define-minor-mode global-hl-line-mode
+ "Global minor mode to highlight the line about point in the current window.
+With ARG, turn Global-Hl-Line mode on if ARG is positive, off otherwise.
+
+Global-Hl-Line mode uses the functions `global-hl-line-unhighlight' and
+`global-hl-line-highlight' on `pre-command-hook' and `post-command-hook'."
+ :global t
+ :group 'hl-line
+ (if global-hl-line-mode
+ (progn
+ (add-hook 'pre-command-hook #'global-hl-line-unhighlight)
+ (add-hook 'post-command-hook #'global-hl-line-highlight))
+ (global-hl-line-unhighlight)
+ (remove-hook 'pre-command-hook #'global-hl-line-unhighlight)
+ (remove-hook 'post-command-hook #'global-hl-line-highlight)))
+
+(defun global-hl-line-highlight ()
+ "Active the Global-Hl-Line overlay on the current line in the current window."
+ (when global-hl-line-mode ; Might be changed outside the mode function.
+ (unless (window-minibuffer-p (selected-window))
+ (unless global-hl-line-overlay
+ (setq global-hl-line-overlay (make-overlay 1 1)) ; to be moved
+ (overlay-put global-hl-line-overlay 'face hl-line-face))
+ (overlay-put global-hl-line-overlay 'window (selected-window))
+ (move-overlay global-hl-line-overlay
+ (line-beginning-position) (1+ (line-end-position))))))
+
+(defun global-hl-line-unhighlight ()
+ "Deactivate the Global-Hl-Line overlay on the current line."
+ (if global-hl-line-overlay
+ (delete-overlay global-hl-line-overlay)))
+
(provide 'hl-line)
;;; hl-line.el ends here
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