"""Displays count of running libvirt VMs.

Required the following python packages:
	* libvirt
        * sys

"""
import sys
import libvirt
import bumblebee.input
import bumblebee.output
import bumblebee.engine

class Module(bumblebee.engine.Module):
    def __init__(self, engine, config):
        super(Module, self).__init__(engine, config,
            bumblebee.output.Widget(full_text=self.status)
        )
        self._status = self.status
        engine.input.register_callback(self, button=bumblebee.input.LEFT_MOUSE,
            cmd="virt-manager")

    def status(self, _):
"""Get number of currently running libvirt VMs"""
    conn = None
    try:
        conn = libvirt.openReadOnly(None)
    except:
        return None
    if conn == None:
        return None
    return "VMs: %d" % conn.numOfDomains()

    def update(self, widgets):
	self._status = self.status