Function: execute-extended-command

execute-extended-command is an interactive and byte-compiled function defined in simple.el.gz.

Signature

(execute-extended-command PREFIXARG &optional COMMAND-NAME TYPED)

Documentation

Read a command name, then read the arguments and call the command.

To pass a prefix argument to the command you are invoking, give a prefix argument to execute-extended-command.

This command provides completion when reading the command name. Which completion candidates are shown can be controlled by customizing read-extended-command-predicate.

View in manual

Probably introduced at or before Emacs version 28.1.

Key Bindings

Source Code

;; Defined in /usr/src/emacs/lisp/simple.el.gz
(defun execute-extended-command (prefixarg &optional command-name typed)
  "Read a command name, then read the arguments and call the command.
To pass a prefix argument to the command you are
invoking, give a prefix argument to `execute-extended-command'.

This command provides completion when reading the command name.
Which completion candidates are shown can be controlled by
customizing `read-extended-command-predicate'."
  (declare (interactive-only command-execute))
  ;; FIXME: Remember the actual text typed by the user before completion,
  ;; so that we don't later on suggest the same shortening.
  (interactive
   (let ((execute-extended-command--last-typed nil))
     (list current-prefix-arg
           (read-extended-command)
           execute-extended-command--last-typed)))
  ;; Emacs<24 calling-convention was with a single `prefixarg' argument.
  (unless command-name
    (let ((current-prefix-arg prefixarg) ; for prompt
          (execute-extended-command--last-typed nil))
      (setq command-name (read-extended-command))
      (setq typed execute-extended-command--last-typed)))
  (let* ((function (and (stringp command-name) (intern-soft command-name)))
         (binding (and suggest-key-bindings
		       (not executing-kbd-macro)
		       (where-is-internal function overriding-local-map t)))
         (delay-before-suggest 0)
         find-shorter shorter)
    (unless (commandp function)
      (error "`%s' is not a valid command name" command-name))
    ;; If we're executing a command that's remapped, we can't actually
    ;; execute that command with the keymapping we've found with
    ;; `where-is-internal'.
    (when (and binding (command-remapping function))
      (setq binding nil))
    ;; Some features, such as novice.el, rely on this-command-keys
    ;; including M-x COMMAND-NAME RET.
    (set--this-command-keys (concat "\M-x" (symbol-name function) "\r"))
    (setq this-command function)
    ;; Normally `real-this-command' should never be changed, but here we really
    ;; want to pretend that M-x <cmd> RET is nothing more than a "key
    ;; binding" for <cmd>, so the command the user really wanted to run is
    ;; `function' and not `execute-extended-command'.  The difference is
    ;; visible in cases such as M-x <cmd> RET and then C-x z (bug#11506).
    (setq real-this-command function)
    (let ((prefix-arg prefixarg))
      (command-execute function 'record))
    ;; Ensure that we never have two of the suggest-binding timers in
    ;; flight.
    (when execute-extended-command--binding-timer
      (cancel-timer execute-extended-command--binding-timer))
    (when (and suggest-key-bindings
               (or binding
                   (and extended-command-suggest-shorter typed)))
      ;; If this command displayed something in the echo area, then
      ;; postpone the display of our suggestion message a bit.
      (setq delay-before-suggest
            (cond
             ((zerop (length (current-message))) 0)
             ((numberp suggest-key-bindings) suggest-key-bindings)
             (t 2)))
      (when (and extended-command-suggest-shorter
                 (not binding)
                 (not executing-kbd-macro)
                 (symbolp function)
                 (> (length (symbol-name function)) 2))
        ;; There's no binding for CMD.  Let's try and find the shortest
        ;; string to use in M-x.  But don't actually do anything yet.
        (setq find-shorter t))
      (when (or binding find-shorter)
        (setq execute-extended-command--binding-timer
              (run-at-time
               delay-before-suggest nil
               (lambda ()
                 ;; If the user has typed any other commands in the
                 ;; meantime, then don't display anything.
                 (when (eq function real-last-command)
                   ;; Find shorter string.
                   (when find-shorter
                     (while-no-input
                       ;; FIXME: Can be slow.  Cache it maybe?
                       (setq shorter (execute-extended-command--shorter
                                      (symbol-name function) typed))))
                   (when (or binding shorter)
                     (with-temp-message
                         (execute-extended-command--describe-binding-msg
                          function binding shorter)
                       (sit-for (if (numberp suggest-key-bindings)
                                    suggest-key-bindings
                                  2))))))))))))