Re: Suppress user-prompting when calling commands in programs

[Eric Abrahamsen]

Drew Adams <drew.adams@oracle.com> writes:


[...]


> What's wrong with them pushing the read into the interactive spec?
>
> (defun foo (&optional arg bar)
>   (interactive (list current-prefix-arg
>                      (org-icompleting-read ...))))
>   ...)

A quick side-question: Everyone here is using &optional for the prefix
arg name. I have several functions lying around that use the "P"
interactive spec but don't specify arg as &optional, and seem to work
fine. My understanding is that, if there is no prefix arg, arg will
simply be nil, as it should be.

Apart from style/code clarity, are there other reasons for specifying
&optional?

Thanks,
E