awesomewm battery widget with colour reflecting the remaining battery life and a notification for low battery

batwidget.lua

-- Tooltip comes from: https://github.com/liliff/web/blob/master/_posts/2012-04-05-first-dive-into-lua-battery-widget.md

function rgbToHex(r, g, b)
    return string.format("#%0.2X%0.2X%0.2X", r, g, b)
end

function chargeToColour(charge)
    local unit = 255 / 100
    local amount = math.floor(unit * charge)
    return rgbToHex(255 - amount, amount, 25)
end

-- {{{ Battery status

batwidget = awful.widget.progressbar()
batwidget:set_width(10)
batwidget:set_height(10)
batwidget:set_vertical(true)
batwidget:set_background_color('#494B4F')
batwidget_t = awful.tooltip({ objects = { batwidget },})
vicious.register(batwidget, vicious.widgets.bat, function (widget, args)
        batwidget_t:set_text(
            "State: " .. args[1]  ..  " | " ..
            "Charge: " .. args[2] .. "% | " ..
            "Remaining: " .. args[3]
        )
        local charge = args[2]
        local colour = chargeToColour(charge)
        batwidget:set_color(colour)
        if charge <= 5 then
            naughty.notify({ text="Battery is low! "
                .. charge .." percent remaining." })
        end
        return charge
    end , 60, "BAT0")

-- }}}

This looks like an awesome widget.

However, in my rc.lua I cannot see vicious defined. Can you show how that variable is defined in your setup?

OK, found the docs (doh google). Nevermind.

Thanks for the rgb.hex :)