class Cucumber::Rake::Task

See the attributes for additional configuration possibilities.
end
t.cucumber_opts = %w{–format progress}
Cucumber::Rake::Task.new do |t|
To further configure the task, you can pass a block:
It will use steps from ‘features/*/.rb’ and features in ‘features/*/.feature’.
This will define a task named cucumber described as ‘Run Cucumber features’.
Cucumber::Rake::Task.new
The simplest use of it goes something like:
Defines a Rake task for running features.

def cucumber_opts=(opts) #:nodoc:

:nodoc: 
def cucumber_opts=(opts) #:nodoc:
  @cucumber_opts = String === opts ? opts.split(' ') : opts
end

def cucumber_opts_with_profile #:nodoc:

:nodoc: 
def cucumber_opts_with_profile #:nodoc:
  @profile ? [cucumber_opts, '--profile', @profile] : cucumber_opts
end

def define_task #:nodoc:

:nodoc: 
def define_task #:nodoc:
  desc @desc
  task @task_name do
    runner.run
  end
end

def feature_files #:nodoc:

:nodoc: 
def feature_files #:nodoc:
  make_command_line_safe(FileList[ ENV['FEATURE'] || [] ])
end

def initialize(task_name = "cucumber", desc = "Run Cucumber features")

Define Cucumber Rake task 
def initialize(task_name = "cucumber", desc = "Run Cucumber features")
  @task_name, @desc = task_name, desc
  @fork = true
  @libs = ['lib']
  @rcov_opts = %w{--rails --exclude osx\/objc,gems\/}
  yield self if block_given?
  @binary = binary.nil? ? Cucumber::BINARY : File.expand_path(binary)
  define_task
end

def make_command_line_safe(list) 

def make_command_line_safe(list)
  list.map{|string| string.gsub(' ', '\ ')}
end

def runner(task_args = nil) #:nodoc:

:nodoc: 
def runner(task_args = nil) #:nodoc:
  cucumber_opts = [(ENV['CUCUMBER_OPTS'] ? ENV['CUCUMBER_OPTS'].split(/\s+/) : nil) || cucumber_opts_with_profile]
  if(@fork)
    return ForkedCucumberRunner.new(libs, binary, cucumber_opts, bundler, feature_files)
  end
  InProcessCucumberRunner.new(libs, cucumber_opts, feature_files)
end