Support for `sourcepos` extension recursively, to provide sync-preview. about pandoc-include HOT 3 OPEN

I'm not very familiar with the sourcepos extension, but what you are trying to do seems to be passing a few more options to the pandoc command when parsing other files. Is that correct?

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Yes, in short, if you dont want to dive into supporting sourcepos extension:

• pass some options to parse included files (including setting variable to included filename)
• pass some options to "reverse parse" when we looking for "!include"

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As for passing options, I believe we can make it more general, like supporting template variables {filename} in pandoc-options. We can also add an option to support setting arbitrary env variables.

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