Detect and enforce comma placement style

[igaray]

e.g. Trailing commas vs leading commas

{a, 
  [ 1, 
    2, 
    3
  ]
}.

vs

{a
, [ 1 
  , 2 
  , 3
  ]
}.

[elbrujohalcon]

Just a warning: you need to distinguish between commas in lists and tuples and commas separating expressions.
I'm pretty sure that will not be trivial.

[paulo-ferraz-oliveira]

I think rebar3_format addresses this issue, kind of, doesn't it?

[elbrujohalcon]

It does, indeed.

[jfacorro]

🎉 rebar3_format already supports comma first?

[elbrujohalcon]

No. It just supports consistent comma placement