local awful = require('awful')
local gears = require('gears')
local function emit_disk_status()
  awful.spawn.easy_async_with_shell(
    "bash -c \"df --output=pcent / | sed '1d;s/^ //;s/%//'\""
    ,
    function(stdout)
      stdout = stdout:gsub("%s+", "")
      stdout = tonumber(stdout)
      awesome.emit_signal('signal::disk', stdout)
    end)
end

gears.timer {
  timeout   = 600,
  call_now  = true,
  autostart = true,
  callback  = function()
    emit_disk_status()
  end
}