how to add numberLines by default in lua filter

how to add numberLines by default in lua filter

[rrraf]

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Hi,

I'm using the lua filter include-code-files which include code from a file 
in a code block. The attributes of the original code block are preserved, 
and so the class numberLines can be used. I would like to modify the lua 
filter to add the numberLines class by default, but I'm struggling.

This line:
https://github.com/pandoc/lua-filters/blob/master/include-code-files/include-code-files.lua#L56
is where the attributes of the original codeblock are passed, using 
cb.attr. I've tried different things, but can't get it to work. So, my 
question is: how can I add the class numberLines to the cb attributes 
before it is passed to pandoc.CodeBlock so that the generating code block 
lines are numbered?

Thanks in advance!

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Re: how to add numberLines by default in lua filter

[Albert Krewinkel]

rrraf <rblists-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> I'm using the lua filter include-code-files which include code from a file
> in a code block. The attributes of the original code block are preserved,
> and so the class numberLines can be used. I would like to modify the lua
> filter to add the numberLines class by default, but I'm struggling.
>
> This line:
> https://github.com/pandoc/lua-filters/blob/master/include-code-files/include-code-files.lua#L56
> is where the attributes of the original codeblock are passed, using
> cb.attr. I've tried different things, but can't get it to work. So, my
> question is: how can I add the class numberLines to the cb attributes
> before it is passed to pandoc.CodeBlock so that the generating code block
> lines are numbered?

The missing puzzle piece for you is probably that `cb.attributes` is a
shorthand for `cb.attr.attributes`, and that the element's classes are
in `cb.attr.classes` or, shorter, `cb.classes`. Thus, running

    cb.classes:insert 'numberLines'

will modify the `cb.attr` element. Inserting that line anywhere before
the `return` should give the desired effect.

--
Albert Krewinkel
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