Add disk usage widget

disk.lua

@@ -0,0 +1,45 @@
+local awful = require("awful")
+local vicious = require("vicious")
+local wibox = require("wibox")
+
+local widget = wibox.widget {
+   {
+      id = "icon",
+      widget = wibox.widget.imagebox,
+      resize = true
+   },
+   layout = wibox.layout.align.horizontal
+}
+local disk_usage = {}
+
+vicious.register(widget, vicious.widgets.fs,
+    function(w, args)
+        disk_usage.root = tonumber(args["{/ used_mb}"]) / tonumber(args["{/ size_mb}"])
+        disk_usage.home = tonumber(args["{/home used_mb}"]) / tonumber(args["{/home size_mb}"])
+    end, 30)
+
+-- These icons should come as beautiful.icons
+function widget.set_icons(icon)
+    widget.icon:set_image(icon)
+end
+
+-- TODO show usage bars in tooltip
+
+-- Tooltip
+awful.tooltip(
+   {
+      objects = { widget },
+      mode = "outside",
+      align = "right",
+      fg = "white",
+      margin_leftright = 10,
+      margin_topbottom = 10,
+      timer_function = function()
+          return "root " .. tostring(disk_usage.root * 100):gsub("%p%d*", "") .. "%\n" ..
+          "home " .. tostring(disk_usage.home * 100):gsub("%p%d*", "") .. "%"
+      end,
+      preferred_positions = {"right", "left", "top", "bottom"}
+   }
+)
+
+return widget