Cop to require keyword arguments instead of an options hash

[yob]

Rails has made the following form of method signature quite popular, and we have lots of instances in our own code:

def foo(bar, options = {})
  ..
end

I'd like a cop to force these methods to be defined with optional keyword args instead:

def foo(bar, baz: true)
  ..
end

The second form is nicely self documenting and avoids a small amount of hash fetch code inside the method.

[bbatsov]

Can't argue with this. I hate option hashes.

[yob]

Cheers. It's probably not a good default - lots of library authors are likely still supporting Ruby versions without keyword arguments - but it'd be great for application code.