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#!/usr/bin/env python
#
# Copyright (C) Damien Elmes <resolve@repose.cx>, 2001.
# This file is licensed under the GPL. Please see COPYING for more details.
#
"""
Display battery usage information and monitor for low available battery.
The default warn and shutdown percentages are very conservative, due
to a badly designed Compaq laptop I own which 'loses' 10% of the total
capacity if allowed to fully discharge. Ideally the info file's
warning and low capacity information should be used instead.
"""
# percentage when a warning should appear
THRESHOLD_WARN = 11
# percentage when the computer should be automatically shut down
THRESHOLD_SHUTDOWN = 9
# total battery capacity (if acpi doesn't know this value)
TOTAL_CAPACITY = 3736.0
ACPI_PROC_DIR = "/proc/acpi/battery/"
STATE_FILE = "state"
INFO_FILE = "info"
import commands
import os
import re
import string
import pyosd, pyosd.daemon as pyd
class BatteryStatus:
"""Provides battery status information.
Provides status information such as the charging state and
remaining capacity. Usage:
bs = BatteryStatus()
bs.check()
print bs.availablePercentage"""
def __init__(self, battery="BAT0"):
"""The battery argument can be used to specify a particular battery to
use, otherwise the first one will be used."""
self.batteryPath = os.path.join(ACPI_PROC_DIR, battery)
stateFilePath = os.path.join(self.batteryPath, STATE_FILE)
try:
self.stateFile = open(stateFilePath)
except:
raise "Couldn't open battery state file: %s" % \
stateFilePath
self.findTotalCapacity()
def findTotalCapacity(self):
"Try and derive the total capacity if it's available"
infoFilePath = os.path.join(self.batteryPath, INFO_FILE)
try:
infoFile = open(infoFilePath)
data = self.readFile(infoFile)
if data['last full capacity']:
full = int(string.split(
data['last full capacity'])[0])
if full:
self.totalCapacity = full
return
except IOError:
self.totalCapacity = TOTAL_CAPACITY
def check(self):
"""Check battery status"""
self.data = self.readFile(self.stateFile)
self.remainingCapacity = int(string.split(self.data['remaining capacity'])[0])
self.percentAvailable = (self.remainingCapacity / float(self.totalCapacity)) * 100
def readFile(self, fileObj):
"""Read an ACPI info or state file into a hash"""
fileObj.seek(0)
lines = fileObj.readlines()
data = {}
for line in lines:
(id, val) = string.split(line, ":", maxsplit=1)
data[id] = string.strip(val)
return data
class plugin:
def __init__(self):
self.plugin_name = "battery"
self.plugin_desc = "Display ACPI battery status"
self.plugin_keys = ["bat"]
self.batstat = BatteryStatus()
self.increment = 100
self.check_battery()
def check_battery(self):
"""Check battery status and warn when it reaches a certain level"""
self.batstat.check()
if self.batstat.data['charging state'] == 'discharging':
# if the battery is discharging, check we're not running out of
# power
if self.batstat.percentAvailable < THRESHOLD_SHUTDOWN:
pyd.top.set_timeout(-1)
pyd.top.display(("Critical! Battery at less than %d%%" +
" - shutting down") % threshhold_shutdown)
os.system("sync")
os.system("sudo halt")
return
if self.batstat.percentAvailable < THRESHOLD_WARN:
pyd.top.set_timeout(-1)
pyd.top.display("Alert! Battery at %d%%" %
self.batstat.percentAvailable)
if self.batstat.percentAvailable < self.increment:
self.bat()
self.increment = self.batstat.percentAvailable - 5
else:
pyd.top.set_timeout(3)
self.increment = 100
pyd.reactor.callLater(30, self.check_battery)
def bat(self, *args):
"""Display battery info"""
self.batstat.check()
if self.batstat.data['charging state'] in ('unknown', 'charged'):
state = "On A/C power."
else:
state = self.batstat.data['charging state']
state = state + " (at %d%%)" % self.batstat.percentAvailable
pyd.top.set_colour("#bbbbFF")
pyd.top.set_timeout(3)
pyd.top.display(state)
pyd.top.display(self.batstat.percentAvailable,
type=pyosd.TYPE_PERCENT, line=1)
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