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The editor command loop sets several Lisp variables to keep status records for itself and for commands that are run.
This variable records the name of the previous command executed by the command loop (the one before the current command). Normally the value is a symbol with a function definition, but this is not guaranteed.
The value is copied from this-command when a command returns to the
command loop, except when the command has specified a prefix argument for
the following command.
This variable is always local to the current terminal and cannot be buffer-local. Voir la section Multiple Displays.
This variable is set up by Emacs just like last-command, but never
altered by Lisp programs.
This variable records the name of the command now being executed by the
editor command loop. Like last-command, it is normally a symbol with
a function definition.
The command loop sets this variable just before running a command, and
copies its value into last-command when the command finishes (unless
the command specified a prefix argument for the following command).
Some commands set this variable during their execution, as a flag for
whatever command runs next. In particular, the functions for killing text
set this-command to kill-region so that any kill commands
immediately following will know to append the killed text to the previous
kill.
If you do not want a particular command to be recognized as the previous
command in the case where it got an error, you must code that command to
prevent this. One way is to set this-command to t at the
beginning of the command, and set this-command back to its proper
value at the end, like this:
(defun foo (args…)
(interactive …)
(let ((old-this-command this-command))
(setq this-command t)
…do the work…
(setq this-command old-this-command)))
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We do not bind this-command with let because that would
restore the old value in case of error—a feature of let which in
this case does precisely what we want to avoid.
This has the same value as this-command except when command remapping
occurs (voir la section Remapping Commands). In that case, this-command
gives the command actually run (the result of remapping), and
this-original-command gives the command that was specified to run but
remapped into another command.
This function returns a string or vector containing the key sequence that
invoked the present command, plus any previous commands that generated the
prefix argument for this command. Any events read by the command using
read-event without a timeout get tacked on to the end.
However, if the command has called read-key-sequence, it returns the
last read key sequence. Voir la section Key Sequence Input. The value is a string
if all events in the sequence were characters that fit in a string.
Voir la section Input Events.
(this-command-keys)
;; Now use C-u C-x C-e to evaluate that.
⇒ "^U^X^E"
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Like this-command-keys, except that it always returns the events in a
vector, so you don't need to deal with the complexities of storing input
events in a string (voir la section Putting Keyboard Events in Strings).
This function empties out the table of events for this-command-keys
to return. Unless keep-record is non-nil, it also empties the
records that the function recent-keys (voir la section Recording Input) will
subsequently return. This is useful after reading a password, to prevent
the password from echoing inadvertently as part of the next command in
certain cases.
This variable holds the last input event read as part of a key sequence, not counting events resulting from mouse menus.
One use of this variable is for telling x-popup-menu where to pop up
a menu. It is also used internally by y-or-n-p (voir la section Yes-or-No Queries).
This variable is set to the last input event that was read by the command
loop as part of a command. The principal use of this variable is in
self-insert-command, which uses it to decide which character to
insert.
last-command-event
;; Now use C-u C-x C-e to evaluate that.
⇒ 5
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The value is 5 because that is the ASCII code for C-e.
The alias last-command-char exists for compatibility with Emacs
version 18.
This variable records which frame the last input event was directed to. Usually this is the frame that was selected when the event was generated, but if that frame has redirected input focus to another frame, the value is the frame to which the event was redirected. Voir la section Input Focus.
If the last event came from a keyboard macro, the value is macro.
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Ce document a été généré par Eric Reinbold le 13 Octobre 2007 en utilisant texi2html 1.78.