use JuliaFormatter for pretty printing Julia expression

[Roger-luo]

I realize that pretty-printing a Julia expression is actually part of the formatter's functionality (since the formatter actually produce strings from CST) so that I'm thinking maybe we should use JuliaFormatter to do the pretty-printing of a given Expr instead of re-implement a huge portion of the same thing in Expronicon. but then the problem would be how do we convert Expr to some kind of CST that this package understands?

[domluna]

CSTParser v3 is supposed to mimic the julia expr so this should be doable. This is a better question for the CSTParser folks though

[penelopeysm]

It would be quite cute to do this, but I agree the main question is not so much about JuliaFormatter but rather the question of how you re-parse the Expr as a syntax tree. Ultimately though my belief is that it's easier to just pretty-print the Expr instead of trying to roundtrip it (the roundtrip will incur at least as much complexity as the pretty-printing).