awesome-wm-widgets/batteryarc-widget/batteryarc.lua

local awful = require("awful")
local naughty = require("naughty")
local wibox = require("wibox")
local watch = require("awful.widget.watch")

local USERNAME = os.getenv("USER")

batteryarc_widget = wibox.widget {
    {
        id = "txt",
        text = "1",
        font = "Play 5",
        widget = wibox.widget.textbox
    },
    max_value = 1,
    rounded_edge = true,
    thickness = 2,
    start_angle = 4.71238898, -- 2pi*3/4
    forced_height = 16,
    forced_width = 16,
    bg = "#ffffff11",
    paddings = 2,
    widget = wibox.container.arcchart,
    set_value = function(self, value)
        self.value = value
    end,
}

watch(
    "acpi", 10,
    function(widget, stdout, stderr, exitreason, exitcode)
        local batteryType
        local _, status, charge_str, time = string.match(stdout, '(.+): (%a+), (%d?%d%d)%%,? ?.*')
        local charge = tonumber(charge_str)
        widget.value = charge / 100
        widget.txt.text = charge
    end,
    batteryarc_widget
)

-- Popup with battery info
-- One way of creating a pop-up notification - naughty.notify
local notification
function show_battery_status()
    awful.spawn.easy_async([[bash -c 'acpi']],
        function(stdout, _, _, _)
            notification = naughty.notify{
                text =  stdout,
                title = "Battery status",
                timeout = 5, hover_timeout = 0.5,
                width = 200,
            }
        end
    )
end
batteryarc_widget:connect_signal("mouse::enter", function() show_battery_status() end)
batteryarc_widget:connect_signal("mouse::leave", function() naughty.destroy(notification) end)

-- Alternative to naughty.notify - tooltip. You can compare both and choose the preferred one

--battery_popup = awful.tooltip({objects = {battery_widget}})

-- To use colors from beautiful theme put
-- following lines in rc.lua before require("battery"):
-- beautiful.tooltip_fg = beautiful.fg_normal
-- beautiful.tooltip_bg = beautiful.bg_normal

--[[ Show warning notification ]]
function show_battery_warning()
    naughty.notify{
        icon = "/home/" .. USERNAME .. "/.config/awesome/nichosi.png",
        icon_size=100,
        text = "Huston, we have a problem",
        title = "Battery is dying",
        timeout = 5, hover_timeout = 0.5,
        position = "bottom_right",
        bg = "#F06060",
        fg = "#EEE9EF",
        width = 300,
    }
end