class RSpec::Support::DirectoryMaker

of stdlib in RSpec.
Replacement for fileutils#mkdir_p because we don’t want to require parts
@api private

def self.directory_exists?(dirname) 

def self.directory_exists?(dirname)
  File.exist?(dirname) && File.directory?(dirname)
end

def self.generate_path(stack, part) 

def self.generate_path(stack, part)
  if stack == ''
    part
  elsif stack == File::SEPARATOR
    File.join('', part)
  else
    File.join(stack, part)
  end
end

def self.generate_path(stack, part) 

def self.generate_path(stack, part)
  File.join(stack, part)
end

def self.generate_stack(path) 

def self.generate_stack(path)
  if path.start_with?(File::SEPARATOR)
    File::SEPARATOR
  elsif path[1] == ':'
    ''
  else
    '.'
  end
end

def self.generate_stack(path) 

def self.generate_stack(path)
  path.start_with?(File::SEPARATOR) ? File::SEPARATOR : "."
end

def self.mkdir_p(path)

Other tags:
    Api: - private 
def self.mkdir_p(path)
  stack = generate_stack(path)
  path.split(File::SEPARATOR).each do |part|
    stack = generate_path(stack, part)
    begin
      Dir.mkdir(stack) unless directory_exists?(stack)
    rescue Errno::EEXIST => e
      raise e unless directory_exists?(stack)
    rescue Errno::ENOTDIR => e
      raise Errno::EEXIST, e.message
    end
  end
end