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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: Tue, 09 Apr 2013 21:46:21 +0200	[thread overview]
Message-ID: <86wqsbcws2.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 '()".

#+name: unset-colnames-example-input
| a | b |
|---+---|
| 1 | 2 |
| 3 | 4 |

** Having no =:colnames= header argument (case 1)

I understand that the following example does have =:colnames= set to =yes=: it is
neither unset nor changed on the code block specification.

#+begin_src emacs-lisp :var data=unset-colnames-example-input
  data
#+end_src

#+results:
| a | b |
|---+---|
| 1 | 2 |
| 3 | 4 |

Hence, this result is what is expected.

** Using =:colnames no= header argument (case 2)

#+begin_src emacs-lisp :var data=unset-colnames-example-input :colnames no
  data
#+end_src

#+results:
| a | b |
|---+---|
| 1 | 2 |
| 3 | 4 |

Here, I still don't understand why I do see the table header line: I did
change the default =:colnames yes= specification to =:colnames no= on the code
block. I did override the default value. Why is the =no= argument not
respected?

** Using =:colnames yes= header argument (case 3)

#+begin_src emacs-lisp :var data=unset-colnames-example-input :colnames yes
  data
#+end_src

#+results:
| a | b |
|---+---|
| 1 | 2 |
| 3 | 4 |

Here, the =:colnames yes= specification is simply redundant to what's specified
for the emacs-lisp language. In all cases, the results is what is should be.

** Using =:colnames nil= header argument (case 5)

#+begin_src emacs-lisp :var data=unset-colnames-example-input :colnames nil
  data
#+end_src

#+results:
| a | b |
|---+---|
| 1 | 2 |
| 3 | 4 |

As written in my previous post, =:colnames nil= is equivalent to =:colnames yes=
in Emacs Lisp, R and sh code blocks -- at least.

(Still) not clear to me -- sorry to be stubborn.

** Using =:colnames ()= header argument (case 6)

As you told me, to "unset" the =:colnames yes= header argument, we must use:

#+begin_src emacs-lisp :var data=unset-colnames-example-input :colnames ()
  data
#+end_src

#+results:
| 1 | 2 |
| 3 | 4 |

That does work.

** Using =:colnames ()= header argument (case 7)

So does the quoted empty list version...

#+begin_src emacs-lisp :var data=unset-colnames-example-input :colnames '()
  data
#+end_src

#+results:
| 1 | 2 |
| 3 | 4 |

What is still unclear to me as well, is why =()= and =nil= aren't the same from
Babel's point of view?

Best regards,
  Seb

-- 
Sebastien Vauban

  parent reply	other threads:[~2013-04-09 19:46 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
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 [this message]
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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