I think this can be closed now
Did this get implemented?
If you mean that code-base of xonsh is now formatted using xonsh, then yes.
Well, I think we actually want an opinionated formatted for xonsh code
The question is whether this should ship with xonsh or be a separate project. Note that this could have opinions that more of us agree with than black and would work on pure python code too.
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Well, I think we actually want an opinionated formatted for xonsh code