Re: Passing multiple options to lua-filter from CLI

[William Lupton <wlupton-QSt+ys/nuMyEUIsrzH9SikB+6BGkLq7r@public.gmane.org>]

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On Fri, 20 Aug 2021 at 17:06, Clément Aubert <aubert.clement-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:

> Thanks a lot for looking into it!
> It does not seem to produce the desired effect on my end.
>
> Could you explain how changing
> return {{Meta = get_default_code_class},
>         {Code = add_default_code_class},
>         {CodeBlock = add_default_code_class}}
> into
> return {{Meta=get_default_code_class}, {CodeBlock=add_default_code_class}}
> (as far as I can tell, this is the only modification) is supposed to
> achieve the desired effect?
>

Ah, well I don't think that you included this in your original message, so
I thought that was the problem :).

return {{Meta = get_default_code_class},
        {Code = add_default_code_class},
        {CodeBlock = add_default_code_class}}

You are correct: the only difference is that you have Code. You could
combine Code and CodeBlock into a single pass, as in:

return {{Meta=get_default_code_class},
        {Code=add_default_code_class, CodeBlock=add_default_code_class}}

But it _does_ work for me! Maybe add some debug output? Here I'm using my
own inspect-like function but the standard inspect would probably be
similar.

Pandoc version? I'm using 2.14.1.

*% *cat default-code-class.lua

utils = require 'utils'


local default_code_classes = {}


function get_default_code_class(meta)

  utils.temp('meta', meta)

  if meta['default-code-class'] then

    default_code_classes =
{pandoc.utils.stringify(meta['default-code-class'])}

  end

end


function add_default_code_class(el)

  utils.temp(el.tag, el)

  if #(el.classes) == 0 then

    el.classes = default_code_classes

    return el

  end

end


return {{Meta=get_default_code_class},

        {Code=add_default_code_class, CodeBlock=add_default_code_class}}


*% *LUA_PATH=../?.lua pandoc -L default-code-class.lua code.md -M
default-code-class="c numberLines"

(#) meta {default-code-class: "c numberLines"}

(#) Code Code {

  attr: Attr {

    attributes: {}

    classes: {}

    identifier: ""

  }

  text: "inline code"

}

(#) CodeBlock CodeBlock {

  attr: Attr {

    attributes: {}

    classes: {}

    identifier: ""

  }

  text: "This is a code block."

}

<p>This is <code class="c numberLines">inline code</code>.</p>

<pre class="c numberLines"><code>This is a code block.</code></pre>

Thanks!
>
> Le ven. 20 août 2021 à 11:57, William Lupton <wlupton@broadband-forum.org>
> a écrit :
>
>> I think you need a two-pass filter, one to pick up the metadata and the
>> other to use it (this is because Meta is called nearly last).
>>
>> This works (I've re-ordered your functions and declared a local variable,
>> but this probably wasn't necessary).
>>
>> *% *cat default-code-class.lua
>>
>> local default_code_classes = {}
>>
>>
>> function get_default_code_class(meta)
>>
>>   if meta['default-code-class'] then
>>
>>     default_code_classes =
>> {pandoc.utils.stringify(meta['default-code-class'])}
>>
>>   end
>>
>> end
>>
>>
>> function add_default_code_class(el)
>>
>>   if #(el.classes) == 0 then
>>
>>     el.classes = default_code_classes
>>
>>     return el
>>
>>   end
>>
>> end
>>
>>
>> return {{Meta=get_default_code_class}, {CodeBlock=add_default_code_class}}
>>
>>
>> *% *pandoc -L default-code-class.lua code.md -M default-code-class="c
>> numberLines"
>>
>> <pre class="c numberLines"><code></code></pre>
>>
>> On Fri, 20 Aug 2021 at 16:29, Clément Aubert <aubert.clement@gmail.com>
>> wrote:
>>
>>> Hi,
>>>
>>> This question relates to
>>> https://github.com/jgm/pandoc/issues/2104#issuecomment-595983954
>>> There is a lua filter containing
>>>
>>> ``` lua
>>> function add_default_code_class(el)
>>>   if #(el.classes) == 0 then
>>>     el.classes = default_code_classes
>>>     return el
>>>   end
>>> end
>>>
>>> function get_default_code_class(meta)
>>>   if meta['default-code-class'] then
>>>     default_code_classes =
>>> {pandoc.utils.stringify(meta['default-code-class'])}
>>>   end
>>> end
>>> ```
>>>
>>> and I'm trying to tweak it so that two classes can be passed from the
>>> command-line, eg. using
>>>
>>> --lua-filter default-code-class.lua -M default-code-class=c, numberLines
>>>
>>> but can't find a way.
>>>
>>> Thanks!
>>> Clément.
>>>
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