Battery.rb

How to use it

The following ruby script can generates the following output

./battery.rb

[+] 01:02 (90%)

./battery.rb -v

The battery is charging
Current Status		90%
Remaining Charging Time	01h02m
Charging Till		22:52

After 91 cycles the battery has 90% of its design capacity

./battery.rb -b

[######### ]

./battery.rb -h

This is a very small script for getting some usefull information about your battery
Please notice that this script requires tp_smapi which is only available on ThinkPads

Version 0.1 written by futejia during the 24C3 in Berlin
The script is published under the 'Beer License' which means you can do whatever you want, and when you like the script you buy me a beer

Command line options:
    All information you usually need in one single line
-h  Prints this help
-b  Prints a nice ascii battery (Single line)
-v  Gives some more information about the battery

The script itself

Simple safe this as battery.rb (Of course you need ruby and tp_smapi installed)

#!/usr/bin/ruby 
def getFileValue(filename)
  file = File.new(filename,"r")
  content = file.gets
  file.close
  content = content.delete "\n"
end

def addLeadingZero(value)
  if value < 10
    output = "0" + value.to_s
  else
    output = value.to_s
  end
end

begin
  state = getFileValue("/sys/devices/platform/smapi/BAT0/state")
  if state == "charging" 
    remaning_time = getFileValue("/sys/devices/platform/smapi/BAT0/remaining_charging_time").to_i
    symbol = "[+]"
    descriptingword = "Charging"
  elsif state == "discharging"
    remaning_time = getFileValue("/sys/devices/platform/smapi/BAT0/remaining_running_time").to_i
    symbol = "[-]"
    descriptingword = "Running"
  elsif state == "idle"
    remaning_time = 0
    symbol = "[ ]"
    descriptingword = "Idle"
  else
    puts "Unknown value: '"+state+"'"
  end
  percent = getFileValue("/sys/devices/platform/smapi/BAT0/remaining_percent").to_i
  batterybar = (percent.to_f / 10).round
  hours = remaning_time / 60
  minutes = remaning_time % 60

  if ARGV[0] == "-v"
   
    puts "The battery is " + state
    #getting some information about the current capacity
    design_capacity = getFileValue("/sys/devices/platform/smapi/BAT0/design_capacity").to_i
    last_full_capacity = getFileValue("/sys/devices/platform/smapi/BAT0/last_full_capacity").to_i
    capacity = last_full_capacity * 100 / design_capacity

    cycles = getFileValue("/sys/devices/platform/smapi/BAT0/cycle_count")

    d = Time::now()
    d += remaning_time * 60
    puts "Current Status\t\t" + percent.to_s + "%"
    puts "Remaining " + descriptingword + " Time\t" +   addLeadingZero(hours) + "h" + addLeadingZero(minutes) + "m"
    if state != "idle"
      puts descriptingword + " Till\t\t" + addLeadingZero(d.hour()) + ":" + addLeadingZero(d.min())
    end
    puts ""
    puts "After " + cycles.to_s + " cycles the battery has " + capacity.to_s + "% of its design capacity"
  elsif ARGV[0] == "-b"
    battery = ""
    batterybar.downto(1) { battery += "#" }
    batterybar.upto(9) { battery += " " }
    puts "[" + battery + "]"
  elsif ARGV[0] == "-h"
    puts "This is a very small script for getting some usefull information about your battery"
    puts "Please notice that this script requires tp_smapi which is only available on ThinkPads"
    puts
    puts "Version 0.1 written by futejia during the 24C3 in Berlin"
    puts "The script is published under the 'Beer License' which means you can do whatever you want, and when you like the script you buy me a beer"
    puts 
    puts "Command line options:"
    puts "    All information you usually need in one single line"
    puts "-h  Prints this help"
    puts "-b  Prints a nice ascii battery (Single line)"
    puts "-v  Gives some more information about the battery"
  else
    puts symbol + " " + addLeadingZero(hours) + ":" + addLeadingZero(minutes) + " (" + percent.to_s + "%)"
  end
end