refactor cpu widget

cpu-widget/cpu-widget.lua

@@ -10,10 +10,10 @@
 
 local watch = require("awful.widget.watch")
 local wibox = require("wibox")
+local beautiful = require("beautiful")
 
 local cpugraph_widget = wibox.widget {
     max_value = 100,
-    color = '#74aeab',
     background_color = "#00000000",
     forced_width = 50,
     step_width = 2,
@@ -21,7 +21,7 @@ local cpugraph_widget = wibox.widget {
     widget = wibox.widget.graph
 }
 
--- mirros and pushs up a bit
+--- By default graph widget goes from left to right, so we mirror it and push up a bit
 local cpu_widget = wibox.container.margin(wibox.container.mirror(cpugraph_widget, { horizontal = true }), 0, 0, 0, 2)
 
 local total_prev = 0
@@ -38,11 +38,8 @@ watch([[bash -c "cat /proc/stat | grep '^cpu '"]], 1,
         local diff_total = total - total_prev
         local diff_usage = (1000 * (diff_total - diff_idle) / diff_total + 5) / 10
 
-        if diff_usage > 80 then
-            widget:set_color('#ff4136')
-        else
-            widget:set_color('#74aeab')
-        end
+        widget:set_color(diff_usage > 80 and beautiful.widget_red
+                                          or beautiful.widget_main_color)
 
         widget:add_value(diff_usage)