class Thor::Runner

skip_lookup true.
described in thorfiles. This look up can be skipped by suppliying
By default, it also traverses the current path until find Thor files, as

in the thor_root instead of loading them all.
Load the thorfiles. If relevant_to is supplied, looks for specific files

def initialize_thorfiles(relevant_to=nil, skip_lookup=false)
  thorfiles(relevant_to, skip_lookup).each do |f|
    Thor::Util.load_thorfile(f) unless Thor::Base.subclass_files.keys.include?(File.expand_path(f))
  end
end