Commit b9c52099 authored by Stefan Monnier's avatar Stefan Monnier
Browse files

*** empty log message ***

parent 44a0e586
......@@ -175,6 +175,11 @@ supported on other platforms, but not on Windows due to using the winsock
* Lisp Changes in Emacs 23.1
+++
** inhibit-modification-hooks is bound to t while running modification hooks.
As a happy consequence, after-change-functions and before-change-functions
are not bound to nil any more while running an (after|before)-change-function.
** Non-breaking space now acts as whitespace.
+++
......
......@@ -4278,35 +4278,6 @@ because it may lead to inefficient behavior for some change hook
functions.
@end defmac
The two variables above are temporarily bound to @code{nil} during the
time that any of these functions is running. This means that if one of
these functions changes the buffer, that change won't run these
functions. If you do want a hook function to make changes that run
these functions, make it bind these variables back to their usual
values.
One inconvenient result of this protective feature is that you cannot
have a function in @code{after-change-functions} or
@code{before-change-functions} which changes the value of that variable.
But that's not a real limitation. If you want those functions to change
the list of functions to run, simply add one fixed function to the hook,
and code that function to look in another variable for other functions
to call. Here is an example:
@example
(setq my-own-after-change-functions nil)
(defun indirect-after-change-function (beg end len)
(let ((list my-own-after-change-functions))
(while list
(funcall (car list) beg end len)
(setq list (cdr list)))))
@group
(add-hooks 'after-change-functions
'indirect-after-change-function)
@end group
@end example
@defvar first-change-hook
This variable is a normal hook that is run whenever a buffer is changed
that was previously in the unmodified state.
......@@ -4318,6 +4289,13 @@ disabled; none of them run. This affects all the hook variables
described above in this section, as well as the hooks attached to
certain special text properties (@pxref{Special Properties}) and overlay
properties (@pxref{Overlay Properties}).
Also, this variable is bound to non-@code{nil} while running those
same hook variables, so that by default modifying the buffer from
a modification hook does not cause other modification hooks to be run.
If you do want modification hooks to be run in a particular piece of
code that is itself run from a modification hook, then rebind locally
@code{inhibit-modification-hooks} to @code{nil}.
@end defvar
@ignore
......
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