default_config.lua

@@ -171,8 +171,7 @@ config.widgets = {
         battery = {
             enabled = true,
             screens = { 1, 2 },
-            refresh_interval = 15, -- In seconds
-            list_refresh_interval = 2, -- In seconds
+            refresh_interval = 30, -- In seconds
             precision = 0, -- How many decimals
         },
     },

simple/widgets/system_resources.lua

@@ -1,4 +1,3 @@
-local awful = require("awful")
 local beautiful = require("beautiful")
 local gears = require("gears")
 local naughty = require("naughty")
@@ -51,13 +50,6 @@ function readCommand(command)
     return r
 end
 
-function readFile(file)
-	local handle = io.open(file, "r")
-	local r = handle:read("*a")
-	handle:close()
-	return r
-end
-
 
 local cpuBar = bars:get_children()[1]:get_children()[1]:get_children()[1]
 function getCpuData()
@@ -139,106 +131,72 @@ gears.timer {
 
 
 
----
---- Batteries
----
-rawBatteries = {}
-function refreshRawBatteries()
-	rawBatteries = readCommand("ls -A1 /sys/class/power_supply")
+
+local battery = wibox.widget {
+    {
+        markup = "-- %",
+        align = "center",
+        valign = "center",
+        widget = wibox.widget.textbox,
+    },
+    margins = beautiful.system_resources_widget_battery_margin,
+    widget = wibox.container.margin,
+}
+
+local batteryText = battery:get_children()[1]
+
+local rawBatteries = readCommand("ls -A1 /sys/class/power_supply")
+
+function getBatteries()
+    return rawBatteries:gmatch("([^\n]+)")
 end
 
-function getBatteryLevel(battery)
+function hasBattery()
+    return rawBatteries:len() > 0
+end
+
+function getBatteryCapacity()
     local charge = 0
     local capacity = 0
-    if fileExists(battery .. "/energy_now") then
-        charge = charge + readFile(battery .. "/energy_now")
-        capacity = capacity + readFile(battery .. "/energy_full")
-    elseif fileExists(battery .. "/charge_now") then
-        charge = charge + readFile(battery .. "/charge_now")
-        capacity = capacity + readFile(battery .. "/charge_full")
-    elseif fileExists(battery .. "/capacity_level") then
-        return readFile(battery .. "/capacity_level")
-    else
-        return "Unsupported"
+    for b in getBatteries() do
+        if b:sub(1,3) ~= 'hid' and readCommand("cat /sys/class/power_supply/" .. b .. "/type"):match("Battery") then
+            if fileExists("/sys/class/power_supply/" .. b .. "/energy_now") then
+                charge = charge + readCommand("cat /sys/class/power_supply/" .. b .. "/energy_now")
+                capacity = capacity + readCommand("cat /sys/class/power_supply/" .. b .. "/energy_full")
+            else
+                charge = charge + readCommand("cat /sys/class/power_supply/" .. b .. "/charge_now")
+                capacity = capacity + readCommand("cat /sys/class/power_supply/" .. b .. "/charge_full")
+            end
+        end
     end
-    return string.format("%." .. config.battery.precision .. "f", (charge / capacity) * 100) .. "%"
+    return charge / capacity
 end
 
-function isCharging(battery)
-    return readFile(battery .. "/status") == "Charging\n"
-end
-
-
-local batteryContainer = wibox.widget {
-    layout = wibox.layout.fixed.horizontal
-}
-local timers = {}
-function refreshBatteries()
-	-- refresh raw batteries and check for change
-	local oldBatteries = rawBatteries
-	refreshRawBatteries()
-	if rawBatteries == oldBatteries then
-		return
-	end
-
-	-- clear timers
-	for i,v in ipairs(timers) do
-		v:stop()
-	end
-	timers = {};
-
-	-- clear layout
-	batteryContainer:set_children({})
-
-	for battery in rawBatteries:gmatch("([^\n]+)") do
-		local path = "/sys/class/power_supply/" .. battery
-		if readFile(path .. "/type"):match("Battery") then
-			-- widget
-			local widget = wibox.widget {
-				{
-					markup = "-- %",
-					align = "center",
-					valign = "center",
-					widget = wibox.widget.textbox,
-				},
-				margins = beautiful.system_resources_widget_battery_margin,
-				widget = wibox.container.margin,
-			}
-
-			-- tooltip
-			local name = readFile(path .. "/model_name")
-			local tooltip = awful.tooltip {
-				text = name
-			}
-			tooltip:add_to_object(widget)
-
-			-- update battery level
-			local batteryText = widget:get_children()[1]
-			local timer = gears.timer {
-				timeout = config.battery.refresh_interval,
-				call_now = true,
-				autostart = true,
-				callback = function()
-					batteryText.markup = (isCharging(path) and "+" or "") .. getBatteryLevel(path)
-				end
-			}
-			table.insert(timers, timer)
-
-			batteryContainer:add(widget)
-		end
-	end
-end
-
-gears.timer {
-    timeout = config.battery.list_refresh_interval,
-    call_now = true,
-    autostart = true,
-    callback = function()
-        refreshBatteries()
+function isCharging()
+    for b in getBatteries() do
+        if readCommand("cat /sys/class/power_supply/" .. b .. "/type"):match("Battery") then
+            return readCommand("cat /sys/class/power_supply/" .. b .. "/status") ~= "Discharging"
+        end
     end
-}
+    return nil
+end
+
+if hasBattery() then
+    gears.timer {
+        timeout = config.battery.refresh_interval,
+        call_now = true,
+        autostart = true,
+        callback = function()
+            batteryText.markup = string.format("%." .. config.battery.precision .. "f", getBatteryCapacity() * 100) .. "%"
+        end
+    }
+else
+    battery = nil
+end
+
+
 
 return {
     bars = bars,
-    battery = batteryContainer,
-}
+    battery = battery,
+}