Nicetitle is an implementation of John Gruber's TitleCase.pl.

The rule set is:

• Small words such as "a", "an", and "but" are not capitalized:
  • except for the word "is";
  • except if the previous word ended with a colon.
• The first and last words are always capitalized, even if they're small words.
• Words starting with (, _, ', or " are capitalized e.g. __foo becomes __Foo.
• Words starting with a dash, or words interspersed with dashes, are capitalized after every dash e.g. -Foo-bar becomes -Foo-Bar.
• Words interspersed with slashes are capitalized "between" every slash e.g. foo/bar becomes Foo/Bar.
• Words starting with a slash are not capitalized.
• URLs are not capitalized.
• Words containing capitals other than the first character are not capitalized e.g. iOS remains untouched.
• Words containing dots are not capitalized.
• All caps sentences are down-cased before applying above mentioned rules.

Check out the test cases for a detailed overview.

Add this line to your application's Gemfile:

gem 'nicetitle'

And then execute:

$ bundle

Or install it yourself as:

$ gem install nicetitle

Calling

Nice.title('What am I reading/listing/applying these days?')

outputs

What Am I Reading/Listing/Applying These Days?

Bug reports and pull requests are welcome on GitHub at https://github.com/evaneykelen/nicetitle.

The gem is available as open source under the terms of the MIT License.

I've written an article about title casing. This article mentions the following similar projects:

• https://daringfireball.net/2008/08/title_case_update
• https://github.com/samsouder/titlecase
• https://github.com/granth/titleize