* Use colorable: argument as the only coloring control
* Centalize color controling logic at Color.colorable?
There are 2 requirements for coloring output:
1. It's supported on the platform
2. The user wants it: `IRB.conf[:USE_COLORIZE] == true`
Right now we check 1 and 2 separately whenever we colorize things.
But it's error-prone because while 1 is the default of `colorable`
parameter, 2 always need to manually checked. When 2 is overlooked, it
causes issues like https://github.com/ruby/irb/pull/362
And there's 0 case where we may want to colorize even when the user
disables it. So I think we should merge 2 into `Color.colorable?` so it
can be automatically picked up.
* Add tests for all inspect modes
* Simplify inspectors' coloring logic
* Replace use_colorize? with Color.colorable?
* Remove Context#use_colorize cause it's redundant
1c53023ac4
When you change this to true, you may need to add more tests.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53141 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
