Ruby Battery Level

battery.rb

#!/usr/bin/env ruby
# coding: utf-8
output = `pmset -g batt`
percent_battery = output.match(/\d+\%/).to_s.gsub("%","").to_f

empty = '▹'
filled = '▸'

color_green = '%{%}'
color_yellow = '%{%}'
color_red = '%{%}'
color_reset = '%{%}'

color = color_green

if percent_battery < 20
  color = color_red
elsif percent_battery < 50
  color = color_yellow
end

num_filled = (percent_battery/10).ceil
puts color + '[' + (filled * num_filled) + empty * (10-num_filled) + ']' + color_reset

my-theme-name.zsh-theme

//Other prompt info as long as it doesn't set RPROMPT

RPROMPT='$(battery.rb)'