module Namespacing

# File lib/namespacing.rb, line 4
def ns(namespace, delim = '.', &block)
  nest_mod(namespace.split(delim), block)
end

# File lib/namespacing.rb, line 23
def find_or_create_constant_in_module(mod, str)
  return mod.const_get(str) if mod.const_defined?(str)
  return mod.const_set(str, Module.new)
end

# File lib/namespacing.rb, line 19
def make_module_methods_accessible(mod)
  mod.module_exec { extend self }
end

# File lib/namespacing.rb, line 9
def nest_mod(mod = Kernel, module_names, block)
  return mod.module_exec(&block) if module_names.empty?
  find_or_create_constant_in_module(mod, to_const(module_names.first)).tap do |this|
    make_module_methods_accessible(this)
    this.module_exec do
      nest_mod(this, module_names.drop(1), block)
    end
  end
end

# File lib/namespacing.rb, line 28
def to_const(str)
  str.split('_')
     .map(&:capitalize)
     .join
end