'listings' package used but not required in LaTeX export

'listings' package used but not required in LaTeX export

[Thorsten Jolitz]

Hi List, 

at the risk that this is caused by some personnal configuration I'm not
aware of at the moment, I report it nevertheless:

When I export an .org buffer with source code blocks (e.g. R) to LaTeX,
functions from the 'listings' package are used in the LaTeX sources,
like e.g. 

,---------------------------------
| \lstset{language=R,numbers=none}
| \begin{lstlisting}
`---------------------------------

but there is no 

,----------------------
| \usepackage{listings}
`----------------------

statement in the preamble. This is about exporting with no further
options or properties set, the default case so to say. 

PS
Emacs Version:
(24.3.1 24 3 gnu/linux hostname x86_64-unknown-linux-gnu x nil)

Org-mode version 8.0.3 (release_8.0.3-165-g60ca9e @
/home/tj/gitclone/org-mode/lisp/)

-- 
cheers,
Thorsten

Re: 'listings' package used but not required in LaTeX export

[Rasmus]

Thorsten Jolitz <tjolitz@gmail.com> writes:

> but there is no 
>
> ,----------------------
> | \usepackage{listings}
> `----------------------

This is a feature to my understanding.

Several packagess can format, and I for instance prefer pygments if I
need code formatting.

You could add listings to your packages list, either
org-latex-packages-alist or even org-latex-default-packages-alist, if
you really want to.

You could probably also write a clever filter to load a package if it
is missing.

–Rasmus

-- 
When in doubt, do it!

Re: 'listings' package used but not required in LaTeX export

[Thorsten Jolitz]

Rasmus <rasmus@gmx.us> writes:

> Thorsten Jolitz <tjolitz@gmail.com> writes:
>
>> but there is no 
>>
>> ,----------------------
>> | \usepackage{listings}
>> `----------------------
>
> This is a feature to my understanding.

mmhh ... I would rather say that the defaults can be as simple as
possible (or desired), but should result in reasonable output without
any user interaction. But without adding a \usepackage{listings} or
modifying the variables you mention the LaTeX output is unusable in this
case.

> Several packagess can format, and I for instance prefer pygments if I
> need code formatting.

Then the default should be loading one of them rather than using package
macros in the exported LaTeX sources without loading a package that
contains those macros. 

> You could add listings to your packages list, either
> org-latex-packages-alist or even org-latex-default-packages-alist, if
> you really want to.
>
> You could probably also write a clever filter to load a package if it
> is missing.

I could, and thanks for the tips, but I still think this can be
considered a bug (if I'm not the only one having the problem). 

-- 
cheers,
Thorsten

Re: 'listings' package used but not required in LaTeX export

[Nicolas Goaziou]

Hello,

Thorsten Jolitz <tjolitz@gmail.com> writes:

> Rasmus <rasmus@gmx.us> writes:
>
>> Thorsten Jolitz <tjolitz@gmail.com> writes:
>>
>>> but there is no 
>>>
>>> ,----------------------
>>> | \usepackage{listings}
>>> `----------------------
>>
>> This is a feature to my understanding.
>
> mmhh ... I would rather say that the defaults can be as simple as
> possible (or desired), but should result in reasonable output without
> any user interaction. But without adding a \usepackage{listings} or
> modifying the variables you mention the LaTeX output is unusable in this
> case.
>
>> Several packagess can format, and I for instance prefer pygments if I
>> need code formatting.
>
> Then the default should be loading one of them rather than using package
> macros in the exported LaTeX sources without loading a package that
> contains those macros. 
>
>> You could add listings to your packages list, either
>> org-latex-packages-alist or even org-latex-default-packages-alist, if
>> you really want to.
>>
>> You could probably also write a clever filter to load a package if it
>> is missing.
>
> I could, and thanks for the tips, but I still think this can be
> considered a bug (if I'm not the only one having the problem).

By default, `org-latex-listings' is nil, which means no "listings" code
is inserted in the output. Therefore, the problem comes from your
configuration (i.e. you changed variable's value without reading its
docstring).


Regards,

-- 
Nicolas Goaziou

Re: 'listings' package used but not required in LaTeX export

[Thorsten Jolitz]

Rasmus <rasmus@gmx.us> writes:
Nicolas Goaziou <n.goaziou@gmail.com> writes:

> By default, `org-latex-listings' is nil, which means no "listings" code
> is inserted in the output. Therefore, the problem comes from your
> configuration (i.e. you changed variable's value without reading its
> docstring).

Ok, thanks to both of you, knowing what to search for I found the entry
in my init file and adapted my settings such that 'listings' are enabled
_and_ the package is loaded by default. 

-- 
cheers,
Thorsten