use gradient over cpu-widget, from main color to red

cpu-widget/cpu-widget.lua

@@ -5,20 +5,20 @@
 -- https://github.com/streetturtle/awesome-wm-widgets/tree/master/cpu-widget
 
 -- @author Pavel Makhov
--- @copyright 2017 Pavel Makhov
+-- @copyright 2019 Pavel Makhov
 -------------------------------------------------
 
 local watch = require("awful.widget.watch")
 local wibox = require("wibox")
-local beautiful = require("beautiful")
 
 local cpugraph_widget = wibox.widget {
     max_value = 100,
     background_color = "#00000000",
     forced_width = 50,
     step_width = 2,
     step_spacing = 1,
-    widget = wibox.widget.graph
+    widget = wibox.widget.graph,
+    color = "linear:0,0:0,22:0,#FF0000:0.3,#FFFF00:0.5,#74aeab"
 }
 
 --- By default graph widget goes from left to right, so we mirror it and push up a bit
@@ -28,7 +28,7 @@ local total_prev = 0
 local idle_prev = 0
 
 watch([[bash -c "cat /proc/stat | grep '^cpu '"]], 1,
-    function(widget, stdout, stderr, exitreason, exitcode)
+    function(widget, stdout)
         local user, nice, system, idle, iowait, irq, softirq, steal, guest, guest_nice =
         stdout:match('(%d+)%s(%d+)%s(%d+)%s(%d+)%s(%d+)%s(%d+)%s(%d+)%s(%d+)%s(%d+)%s(%d+)%s')
 
@@ -38,9 +38,6 @@ 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
 
-        widget:set_color(diff_usage > 80 and beautiful.widget_red
-                                          or beautiful.widget_main_color)
-
         widget:add_value(diff_usage)
 
         total_prev = total