Re: Modify writer or extensions inside a filter

["'Angel Joaniquet' via pandoc-discuss" <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>]

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The lua split function is this


```lua
function split(str,pat)
   local tbl = {}
   str:gsub(pat, function(x) tbl[#tbl+1]=x end)
   return tbl
end
```

El jueves, 15 de abril de 2021 a las 16:08:23 UTC+2, Angel Joaniquet 
escribió:

>
> I'm trying to make a filter to transform some features of org-mode to 
> GitLab-markdown (not supported by Pandoc out of the box), in particular, 
> the math blocks.
>
> The filter should work when transforming to `markdown`, but instead of 
> giving the markdown format for the math blocks (enclosed by `$$...$$`), it 
> should write the blocks as 
>
>     ```  math
>     a + b = c
>     ``` 
>
> The preces I have now is 
>
> In org-mode, the math blocks are simply the latex code:
>
> ```
> \begin{equation}
> a + b = c
> \end{equation}
> ```
>
> this is parsed as a pandoc AST `RawBlock` with format `latex`. I then 
> remove the first (`\begin{equation}`) an last line (`\end{equation}`), and 
> construct a pandoc `CodeBlock` with atrributes `{"math"}`, so the 
> `CodeBlock` object displays in AST as
>
> ```
> CodeBlock ("",["math"],[]) "a + b = c\n"
> ```
>
> and then I let Pandoc create the markdown document, and the written result 
> is 
>
>     ``` {.math}
>     a + b = c
>     ``` 
>
>
>
> **The question:**  
> I want the bare `math`, not `{.math}` written, without the use of CLI 
> options. 
>
>
> I am aware that this can be done setting the Writer extension 
> `fenced_code_attributes` to false (eg. `$pandoc -w 
> markdown-fenced_code_attributes ...`), but I would much prefer this done 
> inside the filter. 
>
> Or is it possible to set the extensions inside the filter?
>
>
> Here is my atempted lua-filter:
>
> ``` lua
> function RawBlock(rb)
>    if rb.format == "latex" then
>       local text = rb.text
>       split_text =  split(text, "[^\n]*")
>       if split_text[1] == '\\begin{equation}'  and 
> split_text[#split_text-1] == '\\end{equation}' then
>          table.remove(split_text, #split_text-1)
>          table.remove(split_text, 1)
>          text = table.concat(split_text, "\n")
>          local cb = pandoc.CodeBlock()
>          cb.attr = {"",{"math"}}
>          cb.text = text
>          return cb
>       end
>    end
> end
> ```
>
>
> Kind regards, 
>
> Angel
>
>
>
>
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