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Re: interactive and &optional arguments

From: Stefan Monnier
Subject: Re: interactive and &optional arguments
Date: Mon, 25 Feb 2013 22:15:14 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

> 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?

Just use a (interactive <spec>) where <spec> is not a string but some
Elisp expression that computes the arguments you want to provide to
the function.


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