gistfile1

#!/usr/bin/env ruby
def truncate(text, length = 30, truncate_string = "...")
  if text.nil? then return end 
  l = length - truncate_string.length
  (text.length > length ? text[0..l] + truncate_string : text).to_s
end

def date
  Time.now.strftime('%Y/%m/%d %H:%M')
end

def mpd
  mpc = `mpc`
  status = mpc =~ /\[(\w+)\]/ && $1
  return 'blargh' unless status
  return status.to_s unless status == 'playing'
  truncate(mpc.split("\n")[0], 30)
end

def battery
  state = File.readlines('/proc/acpi/battery/BAT0/state').map { |l| l.gsub(/.*:\s*/, '').chomp }
  info  = File.readlines('/proc/acpi/battery/BAT0/info').map { |l| l.gsub(/.*:\s*/, '').chomp } 
  percentage = ((state[4].chomp('mAh').to_f / info[2].chomp('mAh').to_f ) * 100).to_i
  status = state[2]
  indicator = case status
    when 'charged' then '='
    when 'charging' then '^'
    when 'discharging' then 'v'
  end
  if status == 'discharging' && percentage <= 10
    system("ssid echo 'Critical battery' | xmessage -buttons quit:0 -default quit -file -")
  end
  "#{indicator}#{percentage}%"
end

def wifi
  (`iwconfig` =~ /Link Quality=(\d+)\/100/ && $1) || 0
end

puts "#{date} | [M: #{mpd}] | [B: #{battery}] | [W: #{wifi}]"