;;; jit-lock.el --- just-in-time fontification -*- lexical-binding: t -*-
-;; Copyright (C) 1998, 2000-2013 Free Software Foundation, Inc.
+;; Copyright (C) 1998, 2000-2014 Free Software Foundation, Inc.
;; Author: Gerd Moellmann <gerd@gnu.org>
;; Keywords: faces files
Stealth fontification only occurs while the system remains unloaded.
If the system load rises above `jit-lock-stealth-load' percent, stealth
fontification is suspended. Stealth fontification intensity is controlled via
-the variable `jit-lock-stealth-nice'."
+the variable `jit-lock-stealth-nice'.
+
+If you need to debug code run from jit-lock, see `jit-lock-debug-mode'."
(setq jit-lock-mode arg)
- (cond (;; Turn Just-in-time Lock mode on.
- jit-lock-mode
-
- ;; Mark the buffer for refontification.
- (jit-lock-refontify)
-
- ;; Install an idle timer for stealth fontification.
- (when (and jit-lock-stealth-time (null jit-lock-stealth-timer))
- (setq jit-lock-stealth-timer
- (run-with-idle-timer jit-lock-stealth-time t
- 'jit-lock-stealth-fontify)))
-
- ;; Create, but do not activate, the idle timer for repeated
- ;; stealth fontification.
- (when (and jit-lock-stealth-time (null jit-lock-stealth-repeat-timer))
- (setq jit-lock-stealth-repeat-timer (timer-create))
- (timer-set-function jit-lock-stealth-repeat-timer
- 'jit-lock-stealth-fontify '(t)))
-
- ;; Init deferred fontification timer.
- (when (and jit-lock-defer-time (null jit-lock-defer-timer))
- (setq jit-lock-defer-timer
- (run-with-idle-timer jit-lock-defer-time t
- 'jit-lock-deferred-fontify)))
-
- ;; Initialize contextual fontification if requested.
- (when (eq jit-lock-contextually t)
- (unless jit-lock-context-timer
- (setq jit-lock-context-timer
- (run-with-idle-timer jit-lock-context-time t
- 'jit-lock-context-fontify)))
- (setq jit-lock-context-unfontify-pos
- (or jit-lock-context-unfontify-pos (point-max))))
-
- ;; Setup our hooks.
- (add-hook 'after-change-functions 'jit-lock-after-change nil t)
- (add-hook 'fontification-functions 'jit-lock-function))
-
- ;; Turn Just-in-time Lock mode off.
- (t
- ;; Cancel our idle timers.
- (when (and (or jit-lock-stealth-timer jit-lock-defer-timer
- jit-lock-context-timer)
- ;; Only if there's no other buffer using them.
- (not (catch 'found
- (dolist (buf (buffer-list))
- (with-current-buffer buf
- (when jit-lock-mode (throw 'found t)))))))
- (when jit-lock-stealth-timer
- (cancel-timer jit-lock-stealth-timer)
- (setq jit-lock-stealth-timer nil))
- (when jit-lock-context-timer
- (cancel-timer jit-lock-context-timer)
- (setq jit-lock-context-timer nil))
- (when jit-lock-defer-timer
- (cancel-timer jit-lock-defer-timer)
- (setq jit-lock-defer-timer nil)))
-
- ;; Remove hooks.
- (remove-hook 'after-change-functions 'jit-lock-after-change t)
- (remove-hook 'fontification-functions 'jit-lock-function))))
+ (cond
+ ((buffer-base-buffer)
+ ;; We're in an indirect buffer. This doesn't work because jit-lock relies
+ ;; on the `fontified' text-property which is shared with the base buffer.
+ (setq jit-lock-mode nil)
+ (message "Not enabling jit-lock: it does not work in indirect buffer"))
+
+ (jit-lock-mode ;; Turn Just-in-time Lock mode on.
+
+ ;; Mark the buffer for refontification.
+ (jit-lock-refontify)
+
+ ;; Install an idle timer for stealth fontification.
+ (when (and jit-lock-stealth-time (null jit-lock-stealth-timer))
+ (setq jit-lock-stealth-timer
+ (run-with-idle-timer jit-lock-stealth-time t
+ 'jit-lock-stealth-fontify)))
+
+ ;; Create, but do not activate, the idle timer for repeated
+ ;; stealth fontification.
+ (when (and jit-lock-stealth-time (null jit-lock-stealth-repeat-timer))
+ (setq jit-lock-stealth-repeat-timer (timer-create))
+ (timer-set-function jit-lock-stealth-repeat-timer
+ 'jit-lock-stealth-fontify '(t)))
+
+ ;; Init deferred fontification timer.
+ (when (and jit-lock-defer-time (null jit-lock-defer-timer))
+ (setq jit-lock-defer-timer
+ (run-with-idle-timer jit-lock-defer-time t
+ 'jit-lock-deferred-fontify)))
+
+ ;; Initialize contextual fontification if requested.
+ (when (eq jit-lock-contextually t)
+ (unless jit-lock-context-timer
+ (setq jit-lock-context-timer
+ (run-with-idle-timer jit-lock-context-time t
+ 'jit-lock-context-fontify)))
+ (setq jit-lock-context-unfontify-pos
+ (or jit-lock-context-unfontify-pos (point-max))))
+
+ ;; Setup our hooks.
+ (add-hook 'after-change-functions 'jit-lock-after-change nil t)
+ (add-hook 'fontification-functions 'jit-lock-function))
+
+ ;; Turn Just-in-time Lock mode off.
+ (t
+ ;; Cancel our idle timers.
+ (when (and (or jit-lock-stealth-timer jit-lock-defer-timer
+ jit-lock-context-timer)
+ ;; Only if there's no other buffer using them.
+ (not (catch 'found
+ (dolist (buf (buffer-list))
+ (with-current-buffer buf
+ (when jit-lock-mode (throw 'found t)))))))
+ (when jit-lock-stealth-timer
+ (cancel-timer jit-lock-stealth-timer)
+ (setq jit-lock-stealth-timer nil))
+ (when jit-lock-context-timer
+ (cancel-timer jit-lock-context-timer)
+ (setq jit-lock-context-timer nil))
+ (when jit-lock-defer-timer
+ (cancel-timer jit-lock-defer-timer)
+ (setq jit-lock-defer-timer nil)))
+
+ ;; Remove hooks.
+ (remove-hook 'after-change-functions 'jit-lock-after-change t)
+ (remove-hook 'fontification-functions 'jit-lock-function))))
(define-minor-mode jit-lock-debug-mode
"Minor mode to help debug code run from jit-lock.
When this minor mode is enabled, jit-lock runs as little code as possible
during redisplay and moves the rest to a timer, where things
like `debug-on-error' and Edebug can be used."
- :global t
+ :global t :group 'jit-lock
(when jit-lock-defer-timer
(cancel-timer jit-lock-defer-timer)
(setq jit-lock-defer-timer nil))
(remove-hook 'jit-lock-functions fun t)
(unless jit-lock-functions (jit-lock-mode nil)))
-;; This function is used to prevent font-lock-fontify-buffer from
-;; fontifying eagerly the whole buffer. This is important for
-;; things like CWarn mode which adds/removes a few keywords and
-;; does a refontify (which takes ages on large files).
(defun jit-lock-refontify (&optional beg end)
"Force refontification of the region BEG..END (default whole buffer)."
(with-buffer-prepared-for-jit-lock
(setq start (text-property-any next end 'fontified nil))))))))
(defun jit-lock-force-redisplay (start end)
- "Force the display engine to re-render buffer BUF from START to END."
+ "Force the display engine to re-render START's buffer from START to END.
+This applies to the buffer associated with marker START."
(when (marker-buffer start)
(with-current-buffer (marker-buffer start)
(with-buffer-prepared-for-jit-lock
(cancel-timer jit-lock-stealth-repeat-timer))
(unless (or executing-kbd-macro
memory-full
- (window-minibuffer-p (selected-window))
+ (window-minibuffer-p)
;; For first invocation set up `jit-lock-stealth-buffers'.
;; In repeated invocations it's already been set up.
(null (if repeat
HCoop / bpt / emacs.git / blobdiff