markdown --> pdf. support multiple columns in latex with tabularray tables, not longtable

markdown --> pdf. support multiple columns in latex with tabularray tables, not longtable

[John Gunstone]

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I use pandoc markdown to generate equipment schedules in latex / pdf and it 
works great. 

To conserve space on the page, we'd like to:
- use a multicolumn (2 cols) format, 
- use tables, that may span across pages

To achieve split cols in sections of the document there is a lua filter: 
jdutant/columns: Multicolumn support for pandoc's markdown (github.com) 
<https://github.com/jdutant/columns>

By default, my understanding is that pandoc uses the "longtable" latex 
package for tables. longtable does not support split columns. 

The relatively new latex tables package, tabularray, that seems to work 
very well. 
I tested the example shown here:
https://tex.stackexchange.com/a/614398/264972

Within that same thread there are suggestions about how overwriting the 
"longtable" definition in pandoc using the -H switch. 

I have no experience with Latex. 
Would overwriting "longtable" with "tabularray" work here? 
Is anyone able to help with the latex code required? 

Many Thanks

John 



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