lazy push before updates

widgets/battery.lua

@@ -0,0 +1,85 @@
+local awful = require("awful")
+local beautiful = require("beautiful")
+local wibox = require("wibox")
+
+local _M = {}
+
+function _M.update(stdout)
+	local bat_now = {
+		present = "N/A",
+		state = "N/A",
+		warninglevel = "N/A",
+		energy = "N/A",
+		energyfull = "N/A",
+		energyrate = "N/A",
+		voltage = "N/A",
+		percentage = "N/A",
+		capacity = "N/A",
+		icon = "N/A",
+	}
+
+	for k, v in stdout:gmatch("([%a]+[%a|-]+):%s*([%a|%d|']+[,|%a|%d|'|-]+)") do
+		if k == "present" then
+			bat_now.present = v
+		elseif k == "state" then
+			bat_now.state = v
+		elseif k == "warning-level" then
+			bat_now.warninglevel = v
+		elseif k == "energy" then
+			bat_now.energy = v:gsub(",", ".") -- Wh
+		elseif k == "energy-full" then
+			bat_now.energyfull = v:gsub(",", ".") -- Wh
+		elseif k == "energy-rate" then
+			bat_now.energyrate = v:gsub(",", ".") -- W
+		elseif k == "voltage" then
+			bat_now.voltage = v:gsub(",", ".") -- V
+		elseif k == "percentage" then
+			bat_now.percentage = tonumber(v) -- %
+		elseif k == "capacity" then
+			bat_now.capacity = v:gsub(",", ".") -- %
+		elseif k == "icon-name" then
+			bat_now.icon = v
+		end
+	end
+
+	return bat_now
+end
+
+function _M.get(show_percentage)
+    _M.show_percentage = show_percentage or true
+	local battery = awful.widget.watch(
+		{
+			awful.util.shell,
+			"-c",
+			"upower -i /org/freedesktop/UPower/devices/battery_BAT0 | sed -n '/present/,/icon-name/p'",
+		},
+		1,
+		function(widget, stdout)
+			local bat_now = _M.update(stdout)
+
+            local icon = wibox.widget.imagebox(beautiful.battery_icon(bat_now.icon) or beautiful.battery_icon_full)
+            local text = wibox.widget.textbox(bat_now.percentage .. "%")
+
+            widget.children = {
+                (_M.show_percentage and text) or wibox.widget.textbox(),
+                icon
+            }
+		end,
+        wibox.widget {
+            layout = wibox.layout.fixed.horizontal,
+        }
+	)
+
+    battery.toggle_percentage = function()
+        _M.show_percentage = not _M.show_percentage
+        battery:emit_signal("widget::redraw_needed")
+    end
+
+	return battery
+end
+
+return setmetatable({}, {
+	__call = function(_, ...)
+		return _M.get(...)
+	end,
+})