I've found that I can use `+raw_tex` which at least allows me to manually process the custom commands:

`pandoc -f latex+raw_tex -F filter.py -t native test.tex`

```
#!/usr/bin/env python
from pandocfilters import Para, Str, toJSONFilter

def foo(key, value, format, meta): 
    if key == 'RawBlock':
        return Para([Str(value[1])])

if __name__ == "__main__":
    toJSONFilter(foo)
```

If there's any other approach to this kind of thing then I'd love to hear it!

On Tuesday, 31 August 2021 at 08:39:04 UTC+1 Rory Byrne wrote:
Hi friends,

I am building a LaTeX package which adds some new annotation commands for semantics, like `\argument{...}` or `\conclusion{...}`. I'm brand new to Pandoc, but I would like to parse a LaTeX file containing these commands into JSON output.

I was thinking that I could write a Pandoc filter which would process those commands, but that doesn't seem possible.

Is there a way to use Pandoc to process a LaTeX file containing custom commands?

Thanks,
Rory

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