Commit 7d9f1aed authored by Richard M. Stallman's avatar Richard M. Stallman
Browse files

(Event Input Misc): Update while-no-input.

parent 0e15f9b4
......@@ -2435,15 +2435,26 @@ Emacs version 18.
@end defvar
@defmac while-no-input body...
This construct runs the @var{body} forms and returns the value
of the last one---but only if no input arrives. If any input
arrives during the execution of the @var{body} forms, it aborts
them (working much like a quit), and the @code{while-no-input}
form returns @code{nil}.
This construct runs the @var{body} forms and returns the value of the
last one---but only if no input arrives. If any input arrives during
the execution of the @var{body} forms, it aborts them (working much
like a quit). The @code{while-no-input} form returns @code{nil} if
aborted by a real quit, and returns @code{t} if aborted by arrival of
other input.
If a part of @var{body} binds @code{inhibit-quit} to non-@code{nil},
arrival of input during those parts won't cause an abort until
the end of that part.
If you want to be able to distingish all possible values computed
by @var{body} from both kinds of abort conditions, write the code
like this:
@example
(while-no-input
(list
(progn . @var{body})))
@end example
@end defmac
@defun discard-input
......
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