From: Ivan Andrus <darthandrus@gmail.com>
To: Nathan Neff <nathan.neff@gmail.com>
Cc: emacs-orgmode <emacs-orgmode@gnu.org>
Subject: Re: Use default value if a variable is not defined
Date: Fri, 12 Oct 2012 17:52:31 +0200 [thread overview]
Message-ID: <0010E925-4776-44F0-AB92-A6AAEEAAE894@gmail.com> (raw)
In-Reply-To: <CAC=HedAr5KshVp2E_h-LZOhZ_1HE927z+8j0_0g-j1T7mwZ-Tw@mail.gmail.com>
On Oct 11, 2012, at 6:04 PM, Nathan Neff wrote:
> Hello,
>
> I'm trying to create a function that will tell org-capture
> dynamically where to put the captured item.
>
> I have it almost working -- where I'm getting hung up on is
> with basic Emacs lisp. I want to basically implement this
> pseudo code:
>
> IF I have defined a variable called njn/current-q-file then
> (find-file njn/current-q-file)
> ELSE
> (find-file ("questions.org")))
>
> However, if I do not define my njn/current-q-file then
> I get a "Symbol's value as variable is void" error when Emacs starts up.
>
> How do I test for the existence (and non-nil ness of a variable in Emacs)
You can use boundp. So
(if (boundp 'njn/current-q-file)
njn/current-q-file
"questions.org")
can be used wherever you need it.
-Ivan
prev parent reply other threads:[~2012-10-12 15:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-11 16:04 Use default value if a variable is not defined Nathan Neff
2012-10-12 15:52 ` Ivan Andrus [this message]
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