#!/usr/bin/env python

import subprocess, re, sys

# Run ioreg to get the battery status line
p = subprocess.Popen(args=["ioreg", "-w0", "-l"], stdout=subprocess.PIPE)
for line in p.stdout.xreadlines():
	if line.find("IOBatteryInfo") >= 0:
		p.stdout.close()
		break
else:
	print "IOBatteryInfo not found!"
	sys.exit(1)


# Parse the line to a dict & calculate the percentage
line = line.strip()
m = re.compile('^.*"IOBatteryInfo" = ').match(line)
line = line[m.end()+1:-1].replace("=", ":")
exec "fields = " + line
fields["Capacity%"] = int(100.0 * float(fields["Capacity"]) / float(fields["AbsoluteMaxCapacity"]))


# Print to screen
for field in ("Current", "Capacity", "Capacity%", "Cycle Count"):
	print "%s:\t%d" % (field, fields[field])