class Helper

parameter　root　String

The root path for package files.

parameter　signing_key　String | Nil

The signing key to use for signing the package.

returns　String

The path to the built gem package.

def build_gem(root: "pkg", signing_key: nil)
	# Ensure the output directory exists:
	FileUtils.mkdir_p("pkg")
	
	output_path = File.join('pkg', @gemspec.file_name)
	
	if signing_key == false
		@gemspec.signing_key = nil
	elsif signing_key.is_a?(String)
		@gemspec.signing_key = signing_key
	elsif signing_key == true and @gemspec.signing_key.nil?
		raise ArgumentError, "Signing key is required for signing the gem, but none was specified by the gemspec."
	end
	
	::Gem::Package.build(@gemspec, false, false, output_path)
end