Re: Battery monitor in system tray

[Sven]

Another Hardware dependent version would be the attached one plus the
following in the rc.lua. It can also manage more than just one battery
and is able to indicate how much juice you have left by color. However
you need wicked and naughty.

----

--bat
require("bat")
batwidget = widget({
    type = 'textbox',
    name = 'batwidget',
    align = 'right'
})
 
wicked.register(batwidget, batstatpoll,
        function(widget, args)
                return ' <span color="#' .. batcolorhex(args[1], {0; 255; 0}, 
{255; 0; 0}) .. '">BAT:' .. args[1] .. '</span> '
        end)

batwidget.mouse_enter = function() batstatwindow("create") end 
batwidget.mouse_leave = function() batstatwindow("destroy") end


        Sven

-- Bat functions for thinkpads
--
-- Todo:
-- remove hardcoded batterycount
--
-- Sven M.


local function read_battery(number)
	local battable = {}
	local fileh

	for i, file in ipairs({ "remaining_capacity"; "last_full_capacity"; "state" }) do
		fileh = io.open("/sys/devices/platform/smapi/BAT" .. number .. "/" .. file, "r")
		if fileh then
			if file ~= "state" then
				battable[file] = fileh:read("*n")
			else
				battable[file] = fileh:read()
			end
			fileh:close()
			if battable[file] == nil then
				return nil
			end
		else
			return nil
		end
	end
	return battable
end

local function read_batteries(min, max)
	local batteries = {}
	for i = min, max do
		local temp = read_battery(i)
		table.insert(batteries, temp)
	end
	return batteries;
end

local function batsum(min, max)
	local batteries = read_batteries(min,max)
	local remsum = 0
	local fullsum = 0

	for i, battable in ipairs(batteries) do
		remsum = remsum + battable["remaining_capacity"]
		fullsum = fullsum + battable["last_full_capacity"]
	end
	batteries["remsum"] = remsum
	batteries["fullsum"] = fullsum
	if fullsum > 0 then
		batteries["percent"] = math.floor(100 * batteries["remsum"] / batteries["fullsum"])
	else
		batteries["percent"] = 0
	end
	return batteries
end

local function batcolor(percent, colorfull, colordead)
	local color = {}
	for i = 1, 3 do
		color[i] = colordead[i] + (colorfull[i] - colordead[i]) * percent / 100
	end
	return color
end

local function batpadd(string, minlen)
	if string:len() < minlen then
		return string.rep('0', minlen - string:len()) .. string
	end
	return string
end

function batcolorhex(percent, colorfull, colordead)
	local color = batcolor(percent, colorfull, colordead)

	return batpadd(string.format("%x", color[1]), 2) .. batpadd(string.format("%x", color[2]), 2) .. batpadd(string.format("%x", color[3]), 2)
end

n_batstatwindow = nil
function batstatwindow(action)
	if action == "create" then
		local batteries = read_batteries(0, 1)
		local text = ""
		for i, battable in ipairs(batteries) do
			local percent = math.floor(100 * battable["remaining_capacity"] / battable["last_full_capacity"])
			text = text .. 'Battery <span color="white">' .. i .. '</span> has <span color="#' .. batcolorhex(percent, {0; 255; 0}, {255; 0; 0}) .. '">' .. percent .. '</span> percent and is <span color="white">' .. battable["state"] .. '</span>\n'
		end
		n_batstatwindow= naughty.notify({text = text, timeout = 0, hover_timeout = 0.5, width = 265})
	elseif action == "destroy" and n_batstatwindow ~= nil then
		naughty.destroy(n_batstatwindow)
		n_batstatwindow = nil
	end
end

function batstatpoll()
	local batteries = batsum(0, 1)
	if batteries[1] ~= nil then
		return {batteries["percent"]}
	end
	return {'0'}
end

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