-This is ../info/lispref.info, produced by makeinfo version 3.12s from
+This is ../info/lispref.info, produced by makeinfo version 4.0 from
lispref/lispref.texi.
INFO-DIR-SECTION XEmacs Editor
Foundation instead of in the original English.
\1f
+File: lispref.info, Node: Interactive Call, Next: Command Loop Info, Prev: Defining Commands, Up: Command Loop
+
+Interactive Call
+================
+
+ After the command loop has translated a key sequence into a
+definition, it invokes that definition using the function
+`command-execute'. If the definition is a function that is a command,
+`command-execute' calls `call-interactively', which reads the arguments
+and calls the command. You can also call these functions yourself.
+
+ - Function: commandp object
+ Returns `t' if OBJECT is suitable for calling interactively; that
+ is, if OBJECT is a command. Otherwise, returns `nil'.
+
+ The interactively callable objects include strings and vectors
+ (treated as keyboard macros), lambda expressions that contain a
+ top-level call to `interactive', compiled-function objects made
+ from such lambda expressions, autoload objects that are declared
+ as interactive (non-`nil' fourth argument to `autoload'), and some
+ of the primitive functions.
+
+ A symbol is `commandp' if its function definition is `commandp'.
+
+ Keys and keymaps are not commands. Rather, they are used to look
+ up commands (*note Keymaps::).
+
+ See `documentation' in *Note Accessing Documentation::, for a
+ realistic example of using `commandp'.
+
+ - Function: call-interactively command &optional record-flag
+ This function calls the interactively callable function COMMAND,
+ reading arguments according to its interactive calling
+ specifications. An error is signaled if COMMAND is not a function
+ or if it cannot be called interactively (i.e., is not a command).
+ Note that keyboard macros (strings and vectors) are not accepted,
+ even though they are considered commands, because they are not
+ functions.
+
+ If RECORD-FLAG is the symbol `lambda', the interactive calling
+ arguments for `command' are read and returned as a list, but the
+ function is not called on them.
+
+ If RECORD-FLAG is `t', then this command and its arguments are
+ unconditionally added to the list `command-history'. Otherwise,
+ the command is added only if it uses the minibuffer to read an
+ argument. *Note Command History::.
+
+ - Function: command-execute command &optional record-flag
+ This function executes COMMAND as an editing command. The
+ argument COMMAND must satisfy the `commandp' predicate; i.e., it
+ must be an interactively callable function or a keyboard macro.
+
+ A string or vector as COMMAND is executed with
+ `execute-kbd-macro'. A function is passed to
+ `call-interactively', along with the optional RECORD-FLAG.
+
+ A symbol is handled by using its function definition in its place.
+ A symbol with an `autoload' definition counts as a command if it
+ was declared to stand for an interactively callable function.
+ Such a definition is handled by loading the specified library and
+ then rechecking the definition of the symbol.
+
+ - Command: execute-extended-command prefix-argument
+ This function reads a command name from the minibuffer using
+ `completing-read' (*note Completion::). Then it uses
+ `command-execute' to call the specified command. Whatever that
+ command returns becomes the value of `execute-extended-command'.
+
+ If the command asks for a prefix argument, it receives the value
+ PREFIX-ARGUMENT. If `execute-extended-command' is called
+ interactively, the current raw prefix argument is used for
+ PREFIX-ARGUMENT, and thus passed on to whatever command is run.
+
+ `execute-extended-command' is the normal definition of `M-x', so
+ it uses the string `M-x ' as a prompt. (It would be better to
+ take the prompt from the events used to invoke
+ `execute-extended-command', but that is painful to implement.) A
+ description of the value of the prefix argument, if any, also
+ becomes part of the prompt.
+
+ (execute-extended-command 1)
+ ---------- Buffer: Minibuffer ----------
+ 1 M-x forward-word RET
+ ---------- Buffer: Minibuffer ----------
+ => t
+
+ - Function: interactive-p
+ This function returns `t' if the containing function (the one that
+ called `interactive-p') was called interactively, with the function
+ `call-interactively'. (It makes no difference whether
+ `call-interactively' was called from Lisp or directly from the
+ editor command loop.) If the containing function was called by
+ Lisp evaluation (or with `apply' or `funcall'), then it was not
+ called interactively.
+
+ The most common use of `interactive-p' is for deciding whether to
+ print an informative message. As a special exception,
+ `interactive-p' returns `nil' whenever a keyboard macro is being
+ run. This is to suppress the informative messages and speed
+ execution of the macro.
+
+ For example:
+
+ (defun foo ()
+ (interactive)
+ (and (interactive-p)
+ (message "foo")))
+ => foo
+
+ (defun bar ()
+ (interactive)
+ (setq foobar (list (foo) (interactive-p))))
+ => bar
+
+ ;; Type `M-x foo'.
+ -| foo
+
+ ;; Type `M-x bar'.
+ ;; This does not print anything.
+
+ foobar
+ => (nil t)
+
+\1f
File: lispref.info, Node: Command Loop Info, Next: Events, Prev: Interactive Call, Up: Command Loop
Information from the Command Loop
This function converts a numeric ASCII value to an event structure,
replete with modifier bits. CH is the character to convert, and
EVENT is the event object to fill in. This function contains
- knowledge about what the codes "mean" - for example, the number 9
- is converted to the character <Tab>, not the distinct character
+ knowledge about what the codes "mean"--for example, the number 9 is
+ converted to the character <Tab>, not the distinct character
<Control-I>.
Note that CH does not have to be a numeric value, but can be a
`dispatch-event') and discarded. This function is provided as a
convenience; it is equivalent to the Lisp code
- (while (progn
- (next-event event)
- (not (or (key-press-event-p event)
- (button-press-event-p event)
- (button-release-event-p event)
- (menu-event-p event))))
- (dispatch-event event))
+ (while (progn
+ (next-event event)
+ (not (or (key-press-event-p event)
+ (button-press-event-p event)
+ (button-release-event-p event)
+ (menu-event-p event))))
+ (dispatch-event event))
Here is what happens if you call `next-command-event' and then
press the right-arrow function key:
(discard-input))
=> nil
-\1f
-File: lispref.info, Node: Waiting, Next: Quitting, Prev: Reading Input, Up: Command Loop
-
-Waiting for Elapsed Time or Input
-=================================
-
- The wait functions are designed to wait for a certain amount of time
-to pass or until there is input. For example, you may wish to pause in
-the middle of a computation to allow the user time to view the display.
-`sit-for' pauses and updates the screen, and returns immediately if
-input comes in, while `sleep-for' pauses without updating the screen.
-
- Note that in FSF Emacs, the commands `sit-for' and `sleep-for' take
-two arguments to specify the time (one integer and one float value),
-instead of a single argument that can be either an integer or a float.
-
- - Function: sit-for seconds &optional nodisp
- This function performs redisplay (provided there is no pending
- input from the user), then waits SECONDS seconds, or until input is
- available. The result is `t' if `sit-for' waited the full time
- with no input arriving (see `input-pending-p' in *Note Peeking and
- Discarding::). Otherwise, the value is `nil'.
-
- The argument SECONDS need not be an integer. If it is a floating
- point number, `sit-for' waits for a fractional number of seconds.
-
- Redisplay is normally preempted if input arrives, and does not
- happen at all if input is available before it starts. (You can
- force screen updating in such a case by using `force-redisplay'.
- *Note Refresh Screen::.) If there is no input pending, you can
- force an update with no delay by using `(sit-for 0)'.
-
- If NODISP is non-`nil', then `sit-for' does not redisplay, but it
- still returns as soon as input is available (or when the timeout
- elapses).
-
- The usual purpose of `sit-for' is to give the user time to read
- text that you display.
-
- - Function: sleep-for seconds
- This function simply pauses for SECONDS seconds without updating
- the display. This function pays no attention to available input.
- It returns `nil'.
-
- The argument SECONDS need not be an integer. If it is a floating
- point number, `sleep-for' waits for a fractional number of seconds.
-
- Use `sleep-for' when you wish to guarantee a delay.
-
- *Note Time of Day::, for functions to get the current time.
-
projects / chise / xemacs-chise.git- / blobdiff