bumblebee-status/modules/core/battery.py

# pylint: disable=C0111,R0903

'''Displays battery status, remaining percentage and charging information.

Parameters:
    * battery.device     : Comma-separated list of battery devices to read information from (defaults to auto for auto-detection)
    * battery.warning    : Warning threshold in % of remaining charge (defaults to 20)
    * battery.critical   : Critical threshold in % of remaining charge (defaults to 10)
    * battery.showdevice : If set to 'true', add the device name to the widget (defaults to False)
    * battery.decorate   : If set to 'false', hides additional icons (charging, etc.) (defaults to True)
    * battery.showpowerconsumption: If set to 'true', show current power consumption (defaults to False)
'''

import os
import glob

import bumblebee.input
import bumblebee.output
import bumblebee.engine
import bumblebee.util

try:
    import power
except ImportError:
    pass

class Module(bumblebee.engine.Module):
    def __init__(self, engine, config):
        widgets = []
        super(Module, self).__init__(engine, config, widgets)
        self._batteries = self.parameter('device', 'auto').split(',')
        if self._batteries[0] == 'auto':
            self._batteries = glob.glob('/sys/class/power_supply/BAT*')
        else:
            self._batteries = ['/sys/class/power_supply/{}'.format(b) for b in self._batteries]
        if len(self._batteries) == 0:
            self._batteries = ['/sys/class/power_supply/BAT0']
        self.update(widgets)
        engine.input.register_callback(self, button=bumblebee.input.LEFT_MOUSE,
            cmd='gnome-power-statistics')

    def update(self, widgets):
        new_widgets = []
        for path in self._batteries:
            widget = self.widget(path)
            if not widget:
                widget = bumblebee.output.Widget(full_text=self.capacity, name=path)
            new_widgets.append(widget)
            self.capacity(widget)
        while len(widgets) > 0: del widgets[0]
        for widget in new_widgets:
            if bumblebee.util.asbool(self.parameter('decorate', True)) == False:
                widget.set('theme.exclude', 'suffix')
            widgets.append(widget)
        self._widgets = widgets

    def remaining(self):
        estimate = 0.0
        try:
            estimate = power.PowerManagement().get_time_remaining_estimate()
            # do not show remaining if on AC
            if estimate == power.common.TIME_REMAINING_UNLIMITED:
                return None
            if estimate == power.common.TIME_REMAINING_UNKNOWN:
                return ''
        except Exception:
            return ''
        return bumblebee.util.durationfmt(estimate*60, shorten=True, suffix=True) # estimate is in minutes

    def capacity(self, widget):
        widget.set('capacity', -1)
        widget.set('ac', False)
        if not os.path.exists(widget.name):
            widget.set('capacity', 100)
            widget.set('ac', True)
            return 'ac'
        capacity = 100
        try:
            with open('{}/capacity'.format(widget.name)) as f:
                capacity = int(f.read())
        except IOError:
            return 'n/a'

        capacity = capacity if capacity < 100 else 100
        widget.set('capacity', capacity)

        # Read power conumption
        if bumblebee.util.asbool(self.parameter('showpowerconsumption', False)):
            r=open(widget.name + '/power_now', 'r')
            output =  '{}% ({})'.format(capacity,str(int(r.read())/1000000) + 'W')
        else:
             output =  '{}%'.format(capacity)

        widget.set('theme.minwidth', '100%')
        if bumblebee.util.asbool(self.parameter('showremaining', True))\
                and self.getCharge(widget) == 'Discharging':
            output = '{} {}'.format(output, self.remaining())

        if bumblebee.util.asbool(self.parameter('showdevice', False)):
            output = '{} ({})'.format(output, os.path.basename(widget.name))

        return output
       
    def state(self, widget):
        state = []
        capacity = widget.get('capacity')

        if capacity < 0:
            return ['critical', 'unknown']

        if capacity < int(self.parameter('critical', 10)):
            state.append('critical')
        elif capacity < int(self.parameter('warning', 20)):
            state.append('warning')

        if widget.get('ac'):
            state.append('AC')
        else:
            charge = self.getCharge(widget)
            if charge == 'Discharging':
                state.append('discharging-{}'.format(min([10, 25, 50, 80, 100], key=lambda i: abs(i-capacity))))
            elif charge == 'Unknown':
                state.append('unknown-{}'.format(min([10, 25, 50, 80, 100], key=lambda i: abs(i-capacity))))
            else:
                if capacity > 95:
                    state.append('charged')
                else:
                    state.append('charging')

        return state

    def getCharge(self, widget):
        charge = ''
        try:
            with open('{}/status'.format(widget.name)) as f:
                charge = f.read().strip()
        except IOError:
                pass
        return charge
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