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[Emacs-diffs] master 9cf9095: CC Mode: check for and fix missing call to
From: |
Alan Mackenzie |
Subject: |
[Emacs-diffs] master 9cf9095: CC Mode: check for and fix missing call to before_change_functions. |
Date: |
Tue, 9 Aug 2016 16:12:53 +0000 (UTC) |
branch: master
commit 9cf9095838aefec9871b9922a95cb4c199696eb8
Author: Alan Mackenzie <address@hidden>
Commit: Alan Mackenzie <address@hidden>
CC Mode: check for and fix missing call to before_change_functions.
Fixes bug #24094 and bug #24074.
This can happen with `revert-buffer' or sometimes `find-file', when the file
is already in a buffer, but the file has been changed outside of Emacs.
* lisp/progmodes/cc-mode (c-after-change): When we detect a missing
invocation of c-before-change-functions, we assume the changed region is the
entire buffer, and call c-before-change explicitly before proceding.
---
lisp/progmodes/cc-mode.el | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)
diff --git a/lisp/progmodes/cc-mode.el b/lisp/progmodes/cc-mode.el
index 8d75eea..0747601 100644
--- a/lisp/progmodes/cc-mode.el
+++ b/lisp/progmodes/cc-mode.el
@@ -492,10 +492,15 @@ preferably use the `c-mode-menu' language constant
directly."
(defvar c-just-done-before-change nil)
(make-variable-buffer-local 'c-just-done-before-change)
;; This variable is set to t by `c-before-change' and to nil by
-;; `c-after-change'. It is used to detect a spurious invocation of
-;; `before-change-functions' directly following on from a correct one. This
-;; happens in some Emacsen, for example when `basic-save-buffer' does (insert
-;; ?\n) when `require-final-newline' is non-nil.
+;; `c-after-change'. It is used for two purposes: (i) to detect a spurious
+;; invocation of `before-change-functions' directly following on from a
+;; correct one. This happens in some Emacsen, for example when
+;; `basic-save-buffer' does (insert ?\n) when `require-final-newline' is
+;; non-nil; (ii) to detect when Emacs fails to invoke
+;; `before-change-functions'. This can happend when reverting a buffer - see
+;; bug #24094. It seems these failures happen only in GNU Emacs; XEmacs
+;; seems to maintain the strict alternation of calls to
+;; `before-change-functions' and `after-change-functions'.
(defun c-basic-common-init (mode default-style)
"Do the necessary initialization for the syntax handling routines
@@ -1251,6 +1256,18 @@ Note that the style variables are always made local to
the buffer."
;; This calls the language variable c-before-font-lock-functions, if non nil.
;; This typically sets `syntax-table' properties.
+ ;; We can sometimes get two consecutive calls to `after-change-functions'
+ ;; without an intervening call to `before-change-functions' when reverting
+ ;; the buffer (see bug #24094). Whatever the cause, assume that the entire
+ ;; buffer has changed.
+ (when (not c-just-done-before-change)
+ (save-restriction
+ (widen)
+ (c-before-change (point-min) (point-max))
+ (setq beg (point-min)
+ end (point-max)
+ old-len (- end beg))))
+
;; (c-new-BEG c-new-END) will be the region to fontify. It may become
;; larger than (beg end).
(setq c-new-END (- (+ c-new-END (- end beg)) old-len))
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