@node Using Interactive
@subsection Using @code{interactive}
+@cindex arguments, interactive entry
This section describes how to write the @code{interactive} form that
makes a Lisp function an interactively-callable command, and how to
examine a command's @code{interactive} form.
@defspec interactive arg-descriptor
-@cindex argument descriptors
This special form declares that the function in which it appears is a
command, and that it may therefore be called interactively (via
@kbd{M-x} or by entering a key sequence bound to it). The argument
or more arguments.
@item
-@cindex argument prompt
It may be a string; then its contents should consist of a code character
followed by a prompt (which some code characters use and some ignore).
The prompt ends either with the end of the string or with a newline.
command. Usually this form will call various functions to read input
from the user, most often through the minibuffer (@pxref{Minibuffers})
or directly from the keyboard (@pxref{Reading Input}).
-@cindex argument evaluation form
Providing point or the mark as an argument value is also common, but
if you do this @emph{and} read input (whether using the minibuffer or
@node Adjusting Point
@section Adjusting Point After Commands
-@cindex adjust point
-@cindex invisible or intangible text, and point display
+@cindex adjusting point
+@cindex invisible/intangible text, and point
@cindex @code{display} property, and point display
@cindex @code{composition} property, and point display
@node Accessing Events
@subsection Accessing Events
-@cindex mouse events, accessing the data
-@cindex accessing data of mouse events
+@cindex mouse events, data in
This section describes convenient functions for accessing the data in
a mouse button or motion event.
is a buffer position, return the size of the character at that position.
@end defun
-@cindex mouse event, timestamp
@cindex timestamp of a mouse event
@defun posn-timestamp position
Return the timestamp in @var{position}. This is the time at which the
for example, @code{describe-key} uses it to read the key to describe.
@defun read-key-sequence prompt &optional continue-echo dont-downcase-last switch-frame-ok command-loop
-@cindex key sequence
This function reads a key sequence and returns it as a string or
vector. It keeps reading events until it has accumulated a complete key
sequence; that is, enough to specify a non-prefix command using the
as the events will already have been added once as they were read for
the first time. An element of the form @code{(@code{t} . @var{event})}
forces @var{event} to be added to the current command's key sequence.
-
@end defvar
@defun listify-key-sequence key
@end defmac
@defun discard-input
-@cindex flush input
-@cindex discard input
-@cindex terminate keyboard macro
+@cindex flushing input
+@cindex discarding input
+@cindex keyboard macro, terminating
This function discards the contents of the terminal input buffer and
cancels any keyboard macro that might be in the process of definition.
It returns @code{nil}.
@node Waiting
@section Waiting for Elapsed Time or Input
-@cindex pausing
@cindex waiting
The wait functions are designed to wait for a certain amount of time
case of @code{read-quoted-char}, this is so that @kbd{C-q} can be used
to quote a @kbd{C-g}.
-@cindex prevent quitting
+@cindex preventing quitting
You can prevent quitting for a portion of a Lisp function by binding
the variable @code{inhibit-quit} to a non-@code{nil} value. Then,
although @kbd{C-g} still sets @code{quit-flag} to @code{t} as usual, the