Get Process RAM usage in Windows - Ruby

process_ram_usage_windows.rb

require 'CSV';

def get_ram_usage(pid) 
	output = CSV.parse(`tasklist /FO CSV /V /FI "PID eq #{pid}"`)
	# Column name is "Mem Usage". Usually it's 5-th column (index 4)
	col_index = output[0].each_index.select { |i| output[0][i] =~ /mem/i }.first || 4
	parse_usage_str output[1][col_index]
end

def parse_usage_str(str)
	str.strip!
	multiplier = 1024 if str =~ /kb?$/i
	multiplier = 1024 * 1024 if str =~ /mb?$/i
	str.gsub! /[\skmb]+/i, ''
	str.gsub! ',', '.'
	str.to_f * multiplier
end

get_ram_usage Process.pid