def perform_something(&block)
	start = Time.monotonic
	yield
	Time.monotonic - start
end

def perform_benchmark_average(ntimes : Int32, &block)
	i = 1
	sum = Time::Span.zero
	while i <= ntimes
		elapsed_time = perform_something &block
		sum += elapsed_time
		i += 1
	end
	sum / ntimes
end

def run_n_times(ntimes : Int32, &block)
	i = 1
	durations = Array(Float64).new
	while i <= ntimes
		elapsed_time = perform_something &block
		durations << elapsed_time.total_nanoseconds
		i += 1
	end
	durations
end

# TODO
def should_nb_files(path : String, expected_nb_files : UInt32)
	raise Exception.new "should_nb_files: not implemented yet"
end

def long_operation(text)
	STDOUT.write "#{text}\r".to_slice
	yield
	STDOUT.write "                                      \r".to_slice
end