local wibox = require('wibox')
local beautiful = require('beautiful')
local watch = require('awful.widget.watch')

local memory = wibox.widget.textbox()
memory.font = beautiful.font

function round(exact, quantum)
    local quant,frac = math.modf(exact/quantum)
    return quantum * (quant + (frac > 0.5 and 1 or 0))
end

watch('bash -c "free | grep -z Mem.*Swap.*"', 1, function(_, stdout)
    local total, used, free, shared, buff_cache, available, total_swap, used_swap, free_swap =
        stdout:match('(%d+)%s*(%d+)%s*(%d+)%s*(%d+)%s*(%d+)%s*(%d+)%s*Swap:%s*(%d+)%s*(%d+)%s*(%d+)')

    memory.text = round((used / 1048576), 0.01) .. 'GB'
    collectgarbage('collect')
end)

return memory