Substring coloring

[apohllo]

Your gem is really good, as it doesn't force users to extend String class. I had a similar solution which was bad in this respect (see apohllo/colors). But it has a feature, which is missing in your gem - I can color a substring within larger string, eg. "quick brown fox".red("fox"). It would be great if this feature were implemented.

I am going to fork your project, to play with that idea.

[nanodeath]

Similar to this, I found I can't color substrings at all.

puts red { "1" + bold { "2" } + "3" }

Expected: red "1", red+bold "2", red "3"
Actual: red "1", red+bold "2", non-bold+non-red "3" (unformatted).

Even if we don't get the solution that apohllo suggested, I think some substring formatting would be nice.