Style/FormatString: Favor String#% over format.

[nekath]

The problem occur when you have class macros. For instance macros from HTTParty:

class MyClass
  include HTTParty
  format :xml
end

Rubocop reports offense:

rubocop_example.rb:3:3: C: Favor String#% over format.
  format :xml
  ^^^^^^

❯ rubocop -v
0.25.0

[bbatsov]

People should really stop overriding methods from Kernel... I guess we can check whether format is invoked with at least to arguments, but of course this won't be exactly bulletproof either.

[nekath]

Thank you for fast response and fix.