module Paperclip::Helpers

def class_for(class_name) 

def class_for(class_name)
  class_name.split('::').inject(Object) do |klass, partial_class_name|
    if klass.const_defined?(partial_class_name)
      klass.const_get(partial_class_name, false)
    else
      klass.const_missing(partial_class_name)
    end
  end
end

def configure 

def configure
  yield(self) if block_given?
end

def each_instance_with_attachment(klass, name)

This method is used by the refresh rake tasks.
Find all instances of the given Active Record model +klass+ with attachment +name+. 
def each_instance_with_attachment(klass, name)
  class_for(klass).unscoped.where("#{name}_file_name IS NOT NULL").find_each do |instance|
    yield(instance)
  end
end

def interpolates key, &block 

def interpolates key, &block
  Paperclip::Interpolations[key] = block
end

def reset_duplicate_clash_check! 

def reset_duplicate_clash_check!
  @names_url = nil
end

def run(cmd, arguments = "", interpolation_values = {}, local_options = {})


runner_options
environment
expected_outcodes
swallow_stderr
logger
These could be: runner
:local_options -> The options to be used by Cocain::CommandLine.

:interpolation_values -> Values to be interpolated into the arguments.

:arguments -> The command line arguments to that binary.

:cmd -> The name of a binary to run.

to that binary, the values to interpolate and some local options.
The run method takes the name of a binary to run, the arguments 
def run(cmd, arguments = "", interpolation_values = {}, local_options = {})
  command_path = options[:command_path]
  terrapin_path_array = Terrapin::CommandLine.path.try(:split, Terrapin::OS.path_separator)
  Terrapin::CommandLine.path = [terrapin_path_array, command_path].flatten.compact.uniq
  if logging? && (options[:log_command] || local_options[:log_command])
    local_options = local_options.merge(:logger => logger)
  end
  Terrapin::CommandLine.new(cmd, arguments, local_options).run(interpolation_values)
end