stefano-m / lua-upower_dbus

Get power information with UPower and DBus

Get information about your power devices using UPower and DBus.

Requirements

In addition to the requirements specified in the rockspec file, you need UPower and DBus (usually both are present in modern GNU/Linux systems). Note that you may need permissions to access the UPower DBus interface.

Installation

Luarocks

This module can be installed with Luarocks by running

luarocks install upower_dbus

Use the --local option in luarocks if you don't want or can't install it system-wide.

NixOS

If you are on NixOS, you can install this package from nix-stefano-m-overlays.

Example

This module exposes the following

• Manager singleton, containing its own properties and the devices array.
• enums table containing the UPower enumerations as arrays of strings.
• Device constructor, although it's advised to use the Manager to get the devices rather then building them by hand.

local GLib = require("lgi").GLib
local ctx = GLib.MainLoop():get_context()
local upower = require("upower_dbus")
-- What version of UPower is in use?
upower.Manager.DaemonVersion
-- Are we using a battery?
upower.Manager.OnBattery
-- Print all fields of the first device found
for k, v in pairs(upower.Manager.devices[1]) do print(k, v) end
-- Enumerate the Device Types known by UPower
for _, v in ipairs(upower.enums.DeviceType) do print(v) end
-- Say that the first device is a battery
battery = upower.Manager.devices[1]
print(battery.Percentage) -- may print 100.0
-- Update the devices in case something changed
ctx:iteration()
-- The battery discharged a bit
battery.Percentage -- may print 99.0