Substituting latex command in equation and math environment

[deb75]

I use pandoc to convert from org file to docx.

It works quite well except that I have some defined latex commands that are not translated in the finale docx document.
Instead, they are treated as raw text.

I would like to use filters to change on the fly my latex commands to something pandoc understands.

As an example, \ket{q} is not understood, but \vert q \ket is correctly translated.

I have difficulties to understand how pandoc lua filters work. How would you do with this simple example ?

Regards

[jgm]

simple example:

function Math(el)
  el.text = string.gsub(el.text, "\\ket", "something else")
end

[deb75]

Thanks for your answer.

I wrote this

function Math(el)
    el.text = string.gsub(el.text, "\\ket{(.-)}", "\\vert %1 \\rangle")
end

in a file filter-math.lua.

Then, I tested it with :

printf "$\ket{eaaza}$ hello" | pandoc --from latex -t native  --lua-filter filter-math.lua

It returned :

[ Para
    [ Math InlineMath "\\ket{eaaza}" , Space , Str "hello" ]
]

Pandoc did not return any errors (exit code=0). What am i doting wrong ?

EDIT1 : I checked directly in lua interpreter that the lua code works as expected, it seems that pandoc just not applies it.

EDIT2: Got it ! You must return the element el at the end of lua function. So the working code is :

function Math(el)
    el.text = string.gsub(el.text, "\\ket{(.-)}", "\\vert %1 \\rangle")
    return el
end

If you have several replacements to do in math environments, do you have to make them in the same function Math ?
Regards

[jgm]

Sorry I forgot that part, glad you figured it out.

If you have several replacements to do in math environments, do you have to make them in the same function Math ?

Yes.