Rubocop v0.16.0 incompatible with rainbow gem v2.0.0

[jhx]

Rubocop v0.16.0 will produce the following error when using v2.0.0 of the rainbow gem. Using v1.99.2 does not produce this error.

undefined method `color' for ".":String

Rainbow changed the default behavior in v2.0.0; we may need to add the following to rubocop:

require 'rainbow/ext/string'

Alternatively, we can adjust the method call. Refer to Rainbow README.

I cannot use v0.17.0, which has a revised gemspec to lock down the rainbow version due to the json gem dependency hell between chef and rubocop.

[bbatsov]

You can use chef from master. It's compatible with json 1.8.

[yujinakayama]

About Rainbow, I've handled the same issue in my Transpec. I think it can be applied to RuboCop.