Hello everyone,

Currently, the only way to exclude files from the formatter is to do 
something like this:

[ 
   inputs: 
     Enum.flat_map( 
       ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"], 
       &Path.wildcard(&1, match_dot: true) 
     ) -- Path.wildcard("test/example_app/**/*.*", match_dot: true) ]



So I think it would be nice to have a more convenient way to do it. Maybe 
something like:
[
  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"],
  exclude: ["test/example_app/**/*.*"]
]

I have a working implementation in this branch but I didn't want to open a 
PR before checking this is actually useful: 
https://github.com/elixir-lang/elixir/compare/main...iaguirre88:formatter-exclude-dir?expand=1

Thanks,
Ignacio

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