cpubar.rb

#!/usr/bin/env ruby
# frozen_string_literal: true

chart_width = 20

cores = `sysctl -n hw.ncpu`.to_i
loads = `sysctl -n vm.loadavg`.split(/ /)[1..3]
unit = (chart_width.to_f / 100)

chart = Array.new(chart_width, '░')
fills = %w[▒ ▓ █]
loads.reverse.each_with_index do |ld, idx|
  chart.fill(fills[idx], 0, (unit * ((ld.to_f / cores) * 100)).to_i)
end

print chart.join('')