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Welcome to the home of Reek, the code smell detector for Ruby!

Reek is a tool that examines Ruby classes, modules and methods and reports any Code Smells it finds. Install it like this:

gem install reek

and run it like this:

reek [options] [dir_or_source_file]*

For more information see Command-Line Options or run

reek --help

Example

Imagine a source file csv_writer.rb containing:

class CsvWriter
  def write_line(fields)
    if (fields.length == 0)
      puts
    else
      write_field(fields[0])
      1.upto(fields.length-1) do |i|
        print ","
        write_field(fields[i])
      end
      puts
    end
  end

  #...
end

Reek will report the following code smells in this file:

$ reek csv_writer.rb
CsvWriter#write_line calls fields.length multiple times (Duplication)
CsvWriter#write_line has approx 6 statements (Long Method)
CsvWriter#write_line/block has the variable name 'i' (Uncommunicative Name)

Features

Reek currently includes checks for some aspects of Control Couple, Data Clump, Feature Envy, Large Class, Long Method, Long Parameter List, Simulated Polymorphism, Uncommunicative Name and more. See the Code Smells for up to date details of exactly what Reek will check in your code.

Tool Integration

Reek integrates with many of your favourite tools:

Use Reek’s Rake Task to easily add Reek to your Rakefile
Use Reek::Spec to add the should_not reek custom matcher to your Rspec examples
Reek is fully compliant with Ruby 1.8.6, 1.8.7 and Ruby 1.9