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-rw-r--r--cpu-widget/README.md34
-rw-r--r--cpu-widget/cpu-widget.lua42
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diff --git a/cpu-widget/README.md b/cpu-widget/README.md
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+# 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,
+ ...
+``` \ No newline at end of file
diff --git a/cpu-widget/cpu-widget.lua b/cpu-widget/cpu-widget.lua
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+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
+)