Elegant though this might be as a mechanism, I'm not convinced it's actually necessary. Removing from 0.1 for now.

This would include e.g. filepath, so that we can use heuristics to tell if it's a NeoVim lua file vs. a normal lua file.

I'm thinking that the function callback should be:

• Configured at the top level of the config.
• Take the following params (in an extensible object):
  • Full file path
  • Effective filetype (using position in file)
  • Row, column
• Return an object either the same as existing filetype or nil (which means fallback to the configured filetypes)