Re: How to detect C-u supplied arguments from other prefix arguments

[Stefan Monnier]

> I'd like to detect whether prefix arguments of a command are supplied
> by C-u or otherwise.

> My idea is to use this-command-keys and compare it to some string,
> like the following pseudo code:

> (defun bla (arg)
>   (interactive "p")

Use (interactive "P") and then `arg' will have different shapes in the
different cases: either nil, or a number (if entered via C-u N1 N2 N3, or
via C-N1 C-N2 C-N3), or a one-element list containing a number 4^N if
entered via sequence of N times C-u.


        Stefan