class Thor

def help(shell, meth=nil, options={})


skip_inherited:: When true, does not show tasks from superclass.
namespace:: When true, shows the namespace in the output before the usage.
==== Options

meth:: An optional task name to print usage information about.
==== Parameters

only about the specific task.
Prints help information. If a task name is given, it shows information 
def help(shell, meth=nil, options={})
  meth, options = nil, meth if meth.is_a?(Hash)
  if meth
    task = all_tasks[meth]
    raise UndefinedTaskError, "task '#{meth}' could not be found in namespace '#{self.namespace}'" unless task
    shell.say "Usage:"
    shell.say "  #{banner(task, options[:namespace], false)}"
    shell.say
    class_options_help(shell, "Class", :Method => task.options.map { |_, o| o })
    shell.say task.description
  else
    list = (options[:short] ? tasks : all_tasks).map do |_, task|
      item = [ banner(task, options[:namespace]) ]
      item << "# #{task.short_description}" if task.short_description
      item << " "
    end
    options[:ident] ||= 2
    if options[:short]
      shell.print_list(list, :ident => options[:ident])
    else
      shell.say "Tasks:"
      shell.print_list(list, :ident => options[:ident])
    end
    Thor::Util.thor_classes_in(self).each do |subclass|
      namespace = options[:namespace] == true || subclass.namespace.gsub(/^#{self.namespace}:/, '')
      subclass.help(shell, options.merge(:short => true, :namespace => namespace))
    end
    class_options_help(shell, "Class") unless options[:short]
  end
end