bumblebee-status/bumblebee/modules/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
"""

import os
import glob

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

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:
            widgets.append(widget)
        self._widgets = widgets

    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)
        if self.parameter("showdevice") == "true":
            widget.set("theme.minwidth", "100% ({})".format(os.path.basename(widget.name)))
            return "{}% ({})".format(capacity, os.path.basename(widget.name))
        widget.set("theme.minwidth", "100%")
        return "{}%".format(capacity)

    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 = ""
            with open("{}/status".format(widget.name)) as f:
                charge = f.read().strip()
            if charge == "Discharging":
                state.append("discharging-{}".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

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