#!/usr/bin/ruby

sleep_interval = 60

def read_data(filename)
  data = Hash.new
  File.open(filename) do |file|
    file.each_line do |line|
      fields = line.chomp.split(/:\s+/)
      data[fields[0]] = fields[1]
    end
  end
  return data
end

def format_hours(hours)
  hour_count = hours.floor
  minute_count = ((hours - hour_count) * 60).floor
  second_count = ((((hours - hour_count) * 60) - minute_count) * 60).floor
  return sprintf("%02d:%02d:%02d", hour_count, minute_count, second_count)
end

info = read_data("/proc/acpi/battery/C174/info")
state = read_data("/proc/acpi/battery/C174/state")

cap_pct = 100 * state["remaining capacity"].to_f / info["design capacity"].to_f

if state["charging state"] == "discharging" then
  remaining_time = format_hours(state["remaining capacity"].to_f / state["present rate"].to_f)
elsif state["charging state"] == "charging" then
  remaining_time = format_hours((info["design capacity"].to_i - state["remaining capacity"].to_i) / state["present rate"].to_f)
else
  remaining_time = "unknown"
end

text = sprintf("%s, %d%%, %s", state["charging state"], cap_pct, remaining_time)

system("osd_cat", "--pos=middle", "--align=center",
       "--font=-*-terminus-bold-r-*-*-*-320-*-*-*-*-iso10646-1",
       "--color=yellow", "--shadow=1",
       "--barmode=percentage",
       "--percentage=#{cap_pct}", "--text=#{text}")