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interactive and &optional arguments

From: Thorsten Jolitz
Subject: interactive and &optional arguments
Date: Tue, 26 Feb 2013 03:09:07 +0100
User-agent: Gnus/5.130002 (Ma Gnus v0.2) Emacs/24.2 (gnu/linux)

Hi List, 

sometimes I want a function with &optional args to be interactive, and I
wonder if there is a way to, as default action, interactively call the
function via M-x without args, except the user does something special -
e.g. C-u M-x - and only then ask the user for input?

That is

 | (defun foo (&optional arg1 arg2 arg3)
 |     (interactive "???")
 |     ...)
 | M-x foo         ; call foo without args
 | C-u M-x foo     ; ask the user for input

or something similar?


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