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emacs/lisp/hl-line.el

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;;; hl-line.el --- highlight the current line -*- lexical-binding:t -*-
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;; Copyright (C) 1998, 2000-2016 Free Software Foundation, Inc.
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;; Author: Dave Love <fx@gnu.org>
;; Maintainer: emacs-devel@gnu.org
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;; Created: 1998-09-13
2010-06-26 21:01:38 +00:00
;; Keywords: faces, frames, emulations
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;; This file is part of GNU Emacs.
;; 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
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) 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
;; 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. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Provides a 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
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;; cursor is difficult to spot, try changing its color, 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).
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;; 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.
;; By default the whole line is highlighted. The range of highlighting
;; can be changed by defining an appropriate function as the
;; buffer-local value of `hl-line-range-function'.
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;;; Code:
(defvar-local hl-line-overlay nil
"Overlay used by Hl-Line mode to highlight the current line.")
(defvar-local global-hl-line-overlay nil
"Overlay used by Global-Hl-Line mode to highlight the current line.")
(defvar global-hl-line-overlays nil
"Overlays used by Global-Hl-Line mode in various buffers.
Global-Hl-Line keeps displaying one overlay in each buffer
when `global-hl-line-sticky-flag' is non-nil.")
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(defgroup hl-line nil
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"Highlight the current line."
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:version "21.1"
:group 'convenience)
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(defface hl-line
'((t :inherit highlight))
"Default face for highlighting the current line in Hl-Line mode."
:version "22.1"
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:group 'hl-line)
(defcustom hl-line-face 'hl-line
"Face with which to highlight the current line in Hl-Line mode."
:type 'face
:group 'hl-line
:set (lambda (symbol value)
(set symbol value)
(dolist (buffer (buffer-list))
(with-current-buffer buffer
(when hl-line-overlay
(overlay-put hl-line-overlay 'face hl-line-face))))
(when global-hl-line-overlay
(overlay-put global-hl-line-overlay 'face hl-line-face))))
(defcustom hl-line-sticky-flag t
"Non-nil means the HL-Line mode highlight appears 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.
This variable has no effect in Global Highlight Line mode.
For that, use `global-hl-line-sticky-flag'."
:type 'boolean
:version "22.1"
:group 'hl-line)
(defcustom global-hl-line-sticky-flag nil
"Non-nil means the Global HL-Line mode highlight appears in all windows.
Otherwise Global Hl-Line mode will highlight only in the selected
window. Setting this variable takes effect the next time you use
the command `global-hl-line-mode' to turn Global Hl-Line mode on."
:type 'boolean
:version "24.1"
:group 'hl-line)
(defvar hl-line-range-function nil
"If non-nil, function to call to return highlight range.
The function of no args should return a cons cell; its car value
is the beginning position of highlight and its cdr value is the
end position of highlight in the buffer.
It should return nil if there's no region to be highlighted.
This variable is expected to be made buffer-local by modes.")
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;;;###autoload
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(define-minor-mode hl-line-mode
Fix minor mode docstrings for the new meaning of a nil ARG. * abbrev.el (abbrev-mode): * allout.el (allout-mode): * autoinsert.el (auto-insert-mode): * autoarg.el (autoarg-mode, autoarg-kp-mode): * autorevert.el (auto-revert-mode, auto-revert-tail-mode) (global-auto-revert-mode): * battery.el (display-battery-mode): * composite.el (global-auto-composition-mode) (auto-composition-mode): * delsel.el (delete-selection-mode): * desktop.el (desktop-save-mode): * dired-x.el (dired-omit-mode): * dirtrack.el (dirtrack-mode): * doc-view.el (doc-view-minor-mode): * double.el (double-mode): * electric.el (electric-indent-mode, electric-pair-mode): * emacs-lock.el (emacs-lock-mode): * epa-hook.el (auto-encryption-mode): * follow.el (follow-mode): * font-core.el (font-lock-mode): * frame.el (auto-raise-mode, auto-lower-mode, blink-cursor-mode): * help.el (temp-buffer-resize-mode): * hilit-chg.el (highlight-changes-mode) (highlight-changes-visible-mode): * hi-lock.el (hi-lock-mode): * hl-line.el (hl-line-mode, global-hl-line-mode): * icomplete.el (icomplete-mode): * ido.el (ido-everywhere): * image-file.el (auto-image-file-mode): * image-mode.el (image-minor-mode): * iswitchb.el (iswitchb-mode): * jka-cmpr-hook.el (auto-compression-mode): * linum.el (linum-mode): * longlines.el (longlines-mode): * master.el (master-mode): * mb-depth.el (minibuffer-depth-indicate-mode): * menu-bar.el (menu-bar-mode): * minibuf-eldef.el (minibuffer-electric-default-mode): * mouse-sel.el (mouse-sel-mode): * msb.el (msb-mode): * mwheel.el (mouse-wheel-mode): * outline.el (outline-minor-mode): * paren.el (show-paren-mode): * recentf.el (recentf-mode): * reveal.el (reveal-mode, global-reveal-mode): * rfn-eshadow.el (file-name-shadow-mode): * ruler-mode.el (ruler-mode): * savehist.el (savehist-mode): * scroll-all.el (scroll-all-mode): * scroll-bar.el (scroll-bar-mode): * server.el (server-mode): * shell.el (shell-dirtrack-mode): * simple.el (auto-fill-mode, transient-mark-mode) (visual-line-mode, overwrite-mode, binary-overwrite-mode) (line-number-mode, column-number-mode, size-indication-mode) (auto-save-mode, normal-erase-is-backspace-mode, visible-mode): * strokes.el (strokes-mode): * time.el (display-time-mode): * t-mouse.el (gpm-mouse-mode): * tool-bar.el (tool-bar-mode): * tooltip.el (tooltip-mode): * type-break.el (type-break-mode-line-message-mode) (type-break-query-mode): * view.el (view-mode): * whitespace.el (whitespace-mode, whitespace-newline-mode) (global-whitespace-mode, global-whitespace-newline-mode): * xt-mouse.el (xterm-mouse-mode): Doc fix. * emacs-lisp/easy-mmode.el (define-globalized-minor-mode): Fix autogenerated docstring.
2011-10-19 12:54:24 +00:00
"Toggle highlighting of the current line (Hl-Line mode).
With a prefix argument ARG, enable Hl-Line mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
the mode if ARG is omitted or nil.
Fix minor mode docstrings for the new meaning of a nil ARG. * abbrev.el (abbrev-mode): * allout.el (allout-mode): * autoinsert.el (auto-insert-mode): * autoarg.el (autoarg-mode, autoarg-kp-mode): * autorevert.el (auto-revert-mode, auto-revert-tail-mode) (global-auto-revert-mode): * battery.el (display-battery-mode): * composite.el (global-auto-composition-mode) (auto-composition-mode): * delsel.el (delete-selection-mode): * desktop.el (desktop-save-mode): * dired-x.el (dired-omit-mode): * dirtrack.el (dirtrack-mode): * doc-view.el (doc-view-minor-mode): * double.el (double-mode): * electric.el (electric-indent-mode, electric-pair-mode): * emacs-lock.el (emacs-lock-mode): * epa-hook.el (auto-encryption-mode): * follow.el (follow-mode): * font-core.el (font-lock-mode): * frame.el (auto-raise-mode, auto-lower-mode, blink-cursor-mode): * help.el (temp-buffer-resize-mode): * hilit-chg.el (highlight-changes-mode) (highlight-changes-visible-mode): * hi-lock.el (hi-lock-mode): * hl-line.el (hl-line-mode, global-hl-line-mode): * icomplete.el (icomplete-mode): * ido.el (ido-everywhere): * image-file.el (auto-image-file-mode): * image-mode.el (image-minor-mode): * iswitchb.el (iswitchb-mode): * jka-cmpr-hook.el (auto-compression-mode): * linum.el (linum-mode): * longlines.el (longlines-mode): * master.el (master-mode): * mb-depth.el (minibuffer-depth-indicate-mode): * menu-bar.el (menu-bar-mode): * minibuf-eldef.el (minibuffer-electric-default-mode): * mouse-sel.el (mouse-sel-mode): * msb.el (msb-mode): * mwheel.el (mouse-wheel-mode): * outline.el (outline-minor-mode): * paren.el (show-paren-mode): * recentf.el (recentf-mode): * reveal.el (reveal-mode, global-reveal-mode): * rfn-eshadow.el (file-name-shadow-mode): * ruler-mode.el (ruler-mode): * savehist.el (savehist-mode): * scroll-all.el (scroll-all-mode): * scroll-bar.el (scroll-bar-mode): * server.el (server-mode): * shell.el (shell-dirtrack-mode): * simple.el (auto-fill-mode, transient-mark-mode) (visual-line-mode, overwrite-mode, binary-overwrite-mode) (line-number-mode, column-number-mode, size-indication-mode) (auto-save-mode, normal-erase-is-backspace-mode, visible-mode): * strokes.el (strokes-mode): * time.el (display-time-mode): * t-mouse.el (gpm-mouse-mode): * tool-bar.el (tool-bar-mode): * tooltip.el (tooltip-mode): * type-break.el (type-break-mode-line-message-mode) (type-break-query-mode): * view.el (view-mode): * whitespace.el (whitespace-mode, whitespace-newline-mode) (global-whitespace-mode, global-whitespace-newline-mode): * xt-mouse.el (xterm-mouse-mode): Doc fix. * emacs-lisp/easy-mmode.el (define-globalized-minor-mode): Fix autogenerated docstring.
2011-10-19 12:54:24 +00:00
Hl-Line mode is a buffer-local minor mode. 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'."
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:group 'hl-line
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(if hl-line-mode
(progn
;; 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)
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(hl-line-unhighlight)
(remove-hook 'change-major-mode-hook #'hl-line-unhighlight t)
(remove-hook 'pre-command-hook #'hl-line-unhighlight t)))
(defun hl-line-make-overlay ()
(let ((ol (make-overlay (point) (point))))
(overlay-put ol 'priority -50) ;(bug#16192)
(overlay-put ol 'face hl-line-face)
ol))
(defun hl-line-highlight ()
"Activate 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 (hl-line-make-overlay))) ; To be moved.
(overlay-put hl-line-overlay
'window (unless hl-line-sticky-flag (selected-window)))
(hl-line-move hl-line-overlay))
(hl-line-unhighlight)))
(defun hl-line-unhighlight ()
"Deactivate the Hl-Line overlay on the current line."
(when hl-line-overlay
(delete-overlay hl-line-overlay)))
;;;###autoload
(define-minor-mode global-hl-line-mode
Fix minor mode docstrings for the new meaning of a nil ARG. * abbrev.el (abbrev-mode): * allout.el (allout-mode): * autoinsert.el (auto-insert-mode): * autoarg.el (autoarg-mode, autoarg-kp-mode): * autorevert.el (auto-revert-mode, auto-revert-tail-mode) (global-auto-revert-mode): * battery.el (display-battery-mode): * composite.el (global-auto-composition-mode) (auto-composition-mode): * delsel.el (delete-selection-mode): * desktop.el (desktop-save-mode): * dired-x.el (dired-omit-mode): * dirtrack.el (dirtrack-mode): * doc-view.el (doc-view-minor-mode): * double.el (double-mode): * electric.el (electric-indent-mode, electric-pair-mode): * emacs-lock.el (emacs-lock-mode): * epa-hook.el (auto-encryption-mode): * follow.el (follow-mode): * font-core.el (font-lock-mode): * frame.el (auto-raise-mode, auto-lower-mode, blink-cursor-mode): * help.el (temp-buffer-resize-mode): * hilit-chg.el (highlight-changes-mode) (highlight-changes-visible-mode): * hi-lock.el (hi-lock-mode): * hl-line.el (hl-line-mode, global-hl-line-mode): * icomplete.el (icomplete-mode): * ido.el (ido-everywhere): * image-file.el (auto-image-file-mode): * image-mode.el (image-minor-mode): * iswitchb.el (iswitchb-mode): * jka-cmpr-hook.el (auto-compression-mode): * linum.el (linum-mode): * longlines.el (longlines-mode): * master.el (master-mode): * mb-depth.el (minibuffer-depth-indicate-mode): * menu-bar.el (menu-bar-mode): * minibuf-eldef.el (minibuffer-electric-default-mode): * mouse-sel.el (mouse-sel-mode): * msb.el (msb-mode): * mwheel.el (mouse-wheel-mode): * outline.el (outline-minor-mode): * paren.el (show-paren-mode): * recentf.el (recentf-mode): * reveal.el (reveal-mode, global-reveal-mode): * rfn-eshadow.el (file-name-shadow-mode): * ruler-mode.el (ruler-mode): * savehist.el (savehist-mode): * scroll-all.el (scroll-all-mode): * scroll-bar.el (scroll-bar-mode): * server.el (server-mode): * shell.el (shell-dirtrack-mode): * simple.el (auto-fill-mode, transient-mark-mode) (visual-line-mode, overwrite-mode, binary-overwrite-mode) (line-number-mode, column-number-mode, size-indication-mode) (auto-save-mode, normal-erase-is-backspace-mode, visible-mode): * strokes.el (strokes-mode): * time.el (display-time-mode): * t-mouse.el (gpm-mouse-mode): * tool-bar.el (tool-bar-mode): * tooltip.el (tooltip-mode): * type-break.el (type-break-mode-line-message-mode) (type-break-query-mode): * view.el (view-mode): * whitespace.el (whitespace-mode, whitespace-newline-mode) (global-whitespace-mode, global-whitespace-newline-mode): * xt-mouse.el (xterm-mouse-mode): Doc fix. * emacs-lisp/easy-mmode.el (define-globalized-minor-mode): Fix autogenerated docstring.
2011-10-19 12:54:24 +00:00
"Toggle line highlighting in all buffers (Global Hl-Line mode).
With a prefix argument ARG, enable Global Hl-Line mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
the mode if ARG is omitted or nil.
If `global-hl-line-sticky-flag' is non-nil, Global Hl-Line mode
highlights the line about the current buffer's point in all
windows.
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
;; In case `kill-all-local-variables' is called.
(add-hook 'change-major-mode-hook #'global-hl-line-unhighlight)
(if global-hl-line-sticky-flag
(remove-hook 'pre-command-hook #'global-hl-line-unhighlight)
(add-hook 'pre-command-hook #'global-hl-line-unhighlight))
(global-hl-line-highlight)
(add-hook 'post-command-hook #'global-hl-line-highlight))
(global-hl-line-unhighlight-all)
(remove-hook 'pre-command-hook #'global-hl-line-unhighlight)
(remove-hook 'post-command-hook #'global-hl-line-highlight)))
(defun global-hl-line-highlight ()
"Highlight the current line in the current window."
(when global-hl-line-mode ; Might be changed outside the mode function.
Do not call to `selected-window' where it is assumed by default. Affected functions are `window-minibuffer-p', `window-dedicated-p', `window-hscroll', `window-width', `window-height', `window-buffer', `window-frame', `window-start', `window-point', `next-window' and `window-display-table'. * abbrev.el (abbrev--default-expand): * bs.el (bs--show-with-configuration): * buff-menu.el (Buffer-menu-mouse-select): * calc/calc.el (calc): * calendar/calendar.el (calendar-generate-window): * calendar/diary-lib.el (diary-simple-display, diary-show-all-entries) (diary-make-entry): * comint.el (send-invisible, comint-dynamic-complete-filename) (comint-dynamic-simple-complete, comint-dynamic-list-completions): * completion.el (complete): * dabbrev.el (dabbrev-expand, dabbrev--make-friend-buffer-list): * disp-table.el (describe-current-display-table): * doc-view.el (doc-view-insert-image): * ebuff-menu.el (Electric-buffer-menu-mouse-select): * ehelp.el (with-electric-help): * emacs-lisp/easy-mmode.el (easy-mmode-define-navigation): * emacs-lisp/edebug.el (edebug-two-window-p, edebug-pop-to-buffer): * emacs-lisp/helper.el (Helper-help-scroller): * emulation/cua-base.el (cua--post-command-handler-1): * eshell/esh-mode.el (eshell-output-filter): * ffap.el (ffap-gnus-wrapper): * help-macro.el (make-help-screen): * hilit-chg.el (highlight-compare-buffers): * hippie-exp.el (hippie-expand, try-expand-dabbrev-visible): * hl-line.el (global-hl-line-highlight): * icomplete.el (icomplete-simple-completing-p): * isearch.el (isearch-done): * jit-lock.el (jit-lock-stealth-fontify): * mail/rmailsum.el (rmail-summary-scroll-msg-up): * lisp/mouse-drag.el (mouse-drag-should-do-col-scrolling): * mpc.el (mpc-tagbrowser, mpc): * net/rcirc.el (rcirc-any-buffer): * play/gomoku.el (gomoku-max-width, gomoku-max-height): * play/landmark.el (landmark-max-width, landmark-max-height): * play/zone.el (zone): * progmodes/compile.el (compilation-goto-locus): * progmodes/ebrowse.el (ebrowse-view/find-file-and-search-pattern): * progmodes/etags.el (find-tag-other-window): * progmodes/fortran.el (fortran-column-ruler): * progmodes/gdb-mi.el (gdb-mouse-toggle-breakpoint-fringe): * progmodes/verilog-mode.el (verilog-point-text): * reposition.el (reposition-window): * rot13.el (toggle-rot13-mode): * server.el (server-switch-buffer): * shell.el (shell-dynamic-complete-command) (shell-dynamic-complete-environment-variable): * simple.el (insert-buffer, set-selective-display) (delete-completion-window): * speedbar.el (speedbar-timer-fn, speedbar-center-buffer-smartly) (speedbar-recenter): * startup.el (fancy-splash-head): * textmodes/ispell.el (ispell-command-loop): * textmodes/makeinfo.el (makeinfo-compilation-sentinel-region): * tutorial.el (help-with-tutorial): * vc/add-log.el (add-change-log-entry): * vc/compare-w.el (compare-windows): * vc/ediff-help.el (ediff-indent-help-message): * vc/ediff-util.el (ediff-setup-control-buffer, ediff-position-region): * vc/ediff-wind.el (ediff-skip-unsuitable-frames) (ediff-setup-control-frame): * vc/emerge.el (emerge-position-region): * vc/pcvs-util.el (cvs-bury-buffer): * window.el (walk-windows, mouse-autoselect-window-select): * winner.el (winner-set-conf, winner-undo): Related users changed.
2013-08-05 14:26:57 +00:00
(unless (window-minibuffer-p)
(unless global-hl-line-overlay
(setq global-hl-line-overlay (hl-line-make-overlay))) ; To be moved.
(unless (member global-hl-line-overlay global-hl-line-overlays)
(push global-hl-line-overlay global-hl-line-overlays))
(overlay-put global-hl-line-overlay 'window
(unless global-hl-line-sticky-flag
(selected-window)))
(hl-line-move global-hl-line-overlay))))
(defun global-hl-line-unhighlight ()
"Deactivate the Global-Hl-Line overlay on the current line."
(when global-hl-line-overlay
(delete-overlay global-hl-line-overlay)))
(defun global-hl-line-unhighlight-all ()
"Deactivate all Global-Hl-Line overlays."
(mapc (lambda (ov)
(let ((ovb (overlay-buffer ov)))
(when (bufferp ovb)
(with-current-buffer ovb
(global-hl-line-unhighlight)))))
global-hl-line-overlays)
(setq global-hl-line-overlays nil))
(defun hl-line-move (overlay)
"Move the Hl-Line overlay.
If `hl-line-range-function' is non-nil, move the OVERLAY to the position
where the function returns. If `hl-line-range-function' is nil, fill
the line including the point by OVERLAY."
(let (tmp b e)
(if hl-line-range-function
(setq tmp (funcall hl-line-range-function)
b (car tmp)
e (cdr tmp))
(setq tmp t
b (line-beginning-position)
e (line-beginning-position 2)))
(if tmp
(move-overlay overlay b e)
(move-overlay overlay 1 1))))
(defun hl-line-unload-function ()
"Unload the Hl-Line library."
(global-hl-line-mode -1)
(save-current-buffer
(dolist (buffer (buffer-list))
(set-buffer buffer)
(when hl-line-mode (hl-line-mode -1))))
;; continue standard unloading
nil)
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(provide 'hl-line)
;;; hl-line.el ends here