0

Something like the example below, which I want to test whether you are eligible to enter a number before you actually enter this number

(defun foo (x)
  (cond (condition (progn (interactive "nEnter your number: ") ...))
        (t (message "You cannot enter a number right now!"))))
  • You can pass an expression that evaluates to the list of arguments to interactive. – DoMiNeLa10 Feb 7 at 16:31
0

You want something like this, as suggested by @DoMiNeLa10.

(defun foo(x)
  (interactive (list (if condition
             (read-number "Enter your number: ")
               (error"You cannot enter a number right now!"))))
  (message "%s" x))
  • Perfect, an example is exactly what`s needed for a beginner like me! Thank you! – Matthew Zeng Feb 7 at 20:58

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