From: "Sebastien Vauban" <wxhgmqzgwmuf-geNee64TY+gS+FvcfC7Uqw@public.gmane.org>
To: emacs-orgmode-mXXj517/zsQ@public.gmane.org
Subject: Re: [babel] Bugs for Emacs Lisp code blocks
Date: Mon, 08 Apr 2013 22:14:00 +0200 [thread overview]
Message-ID: <86ehek93w7.fsf@somewhere.org> (raw)
In-Reply-To: 87d2u65dr1.fsf@gmail.com
Hi Eric,
Eric Schulte wrote:
> "Sebastien Vauban" <wxhgmqzgwmuf-geNee64TY+gS+FvcfC7Uqw@public.gmane.org> writes:
>> Eric Schulte wrote:
>>> Emacs Lisp is an exception in terms of colname processing, it has default
>>> header arguments set to pass column names through to the code block, where
>>> the processing may be done trivially in Emacs Lisp.
>>
>> OK, but I don't understand the precedence of header arguments. I thought
>> that a header argument given on the code block preempted all the other
>> values (system-wide default for all languages, language defaults, file-wide
>> arguments, and subtree arguments).
>>
>> Why isn't this true here as well?
>
> That is what is happening here, although combinations of :hlines and
> :colnames can be tricky. Especially weird, is that if you want to *unset* a
> header argument which is set at a higher level, you need to set it to '(),
> as in ":colnames '()".
Much clearer, but not yet crystal-clear for me...
Let me explain. AFAICT, there were 5 possibles values of the ":colnames"
header argument:
- no header argument :: (default for all languages but Emacs Lisp)
- ":colnames no" :: (default for Emacs Lisp code blocks)
- ":colnames yes" :: Tells Org Babel that your first row contains column
names.
- ":colnames <LIST>" :: Specifies to use <LIST> as column names.
- ":colnames nil" :: Same as ":colnames yes".
Right?
Now, indeed, your trick with ":colnames '()" (or even ":colnames ()"...) does
work well for Emacs-Lisp...
Though, I thought that "()" was equivalent to "nil", but it seems not to be
the case, then. Is it because of some sort of type coercion, that would
convert nil as a string or something along such lines?
Extra question: when do we have to use such a trick? When the value can be a
list of things? If yes, why are you talking of ":hlines" -- there is no list
argument there?
Best regards,
Seb
--
Sebastien Vauban
next prev parent reply other threads:[~2013-04-08 20:14 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-06 15:44 [babel] Bugs for Emacs Lisp code blocks Sebastien Vauban
2013-04-07 13:29 ` Eric Schulte
2013-04-07 15:47 ` Sebastien Vauban
2013-04-07 19:42 ` Eric Schulte
2013-04-08 20:14 ` Sebastien Vauban [this message]
2013-04-08 21:07 ` Eric Schulte
2013-04-09 8:13 ` Sebastien Vauban
2013-04-12 22:03 ` Eric Schulte
2013-04-15 13:46 ` Sebastien Vauban
2013-04-09 19:46 ` Sebastien Vauban
2013-04-10 7:54 ` Sebastien Vauban
2013-04-12 22:10 ` Eric Schulte
2013-04-15 14:09 ` Sebastien Vauban
2013-04-15 15:26 ` Eric Schulte
2013-04-12 22:09 ` Eric Schulte
2013-04-15 14:04 ` Sebastien Vauban
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