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This class implements a pretty printing algorithm.


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This class implements a pretty printing algorithm. It finds line breaks and nice indentations for grouped structure.

By default, the class assumes that primitive elements are strings and each byte in the strings have single column in width. But it can be used for other situations by giving suitable arguments for some methods:

  • newline object and space generation block for
  • optional width argument for PrettyPrint#text
  • PrettyPrint#breakable

There are several candidate uses:

  • text formatting using proportional fonts
  • multibyte characters which has columns different to number of bytes


Add this line to your application's Gemfile:

gem 'prettyprint'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install prettyprint


After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at