cpu widget

cpu-widget/README.md

@@ -0,0 +1,34 @@
+# CPU widget
+
+This widget shows the average CPU load among all cores of the machine:
+
+![screenshot](out.git)
+
+When the load is more than 80% the graph becomes red. You can easily customize the widget by changing colors, step width, step spacing, width and interval.
+
+## How it works
+
+To measure the load I took Paul Colby's bash [script](http://colby.id.au/calculating-cpu-usage-from-proc-stat/)and rewrote it in Lua, which was quite simple.
+So awesome simply reads the first line of /proc/stat:
+
+```bash
+$ cat /proc/stat | grep '^cpu '
+cpu  197294 718 50102 2002182 3844 0 2724 0 0 0
+```
+
+and calculates the percentage.
+
+## Installation
+
+Clone/download repo and use widget in **rc.lua**:
+
+```lua
+require("awesome-wm-widgets.cpu-widget.cpu-widget")
+...
+s.mytasklist, -- Middle widget
+	{ -- Right widgets
+    	layout = wibox.layout.fixed.horizontal,
+		...
+		cpu_widget,
+		...
+```

cpu-widget/cpu-widget.lua

@@ -0,0 +1,42 @@
+local watch = require("awful.widget.watch")
+local wibox = require("wibox")
+
+cpugraph_widget = wibox.widget {
+    max_value = 100,
+    color = '#74aeab',
+    background_color = "#1e252c",
+    forced_width = 50,
+    step_width = 2,
+    step_spacing = 1,
+    widget = wibox.widget.graph
+}
+
+cpu_widget = wibox.container.mirror(cpugraph_widget, { horizontal = true })
+
+local total_prev = 0
+local idle_prev = 0
+
+watch("cat /proc/stat | grep '^cpu '", 1,
+    function(widget, stdout, stderr, exitreason, exitcode)
+        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')
+
+        local total = user + nice + system + idle + iowait + irq + softirq + steal
+
+        local diff_idle = idle - idle_prev
+        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:add_value(diff_usage)
+
+        total_prev = total
+        idle_prev = idle
+    end,
+    cpugraph_widget
+)