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If in doubt about how to submit, see SUBMISSION_GUIDELINES file.

In this exercise, we'll be wrapping command line applications to make them feel like ordinary Ruby libraries. Please keep the following guidelines in mind while working on this problem.


  • You can choose any freely available command line application you'd like to wrap, although ideally it will NOT be written in Ruby.

  • Your goal is to create a library that wraps the target command line application to do something interesting. You do not necessarily need to expose all of the features or options from the underlying command line application, but your wrapper should be featureful enough to be useful.

  • For simple things, you may be able to get away with ordinary system calls, for more complex interactions, you may need to use popen() or the open3 standard library, or some other third party tool.

  • You should provide tests or at least some good examples to demonstrate how your library is meant to be used.

  • It's not absolutely essential to avoid reinventing the wheel, but you get some bonus points for wrapping an application that either hasn't already been wrapped, or hasn't been wrapped in the way you plan to.

  • Be sure to announce what application you plan to wrap to avoid duplication. Two students may not wrap the same application unless there is very little overlap between their ideas.


  • A library that wraps the OS X 'say' command with an API that allows direct audio output, output to file in different formats, input from a string or a file, and selection of voices.

  • A library that the command line Go game engine gnugo and makes it possible to play a game through a Ruby API, capturing the board output and converting it to Ruby objects.


Hit up the mailing list or IRC. RMU exercises are left deliberately open ended, and often benefit from some discussion before, during, and after you work on them.