[modules] Add initial version of a load module

Add a load module that shows 1/5/15 minute load average and allows the
user to set warning and critical thresholds on the 1 minute average.

fixes #9

bumblebee/modules/load.py

@@ -0,0 +1,37 @@
+import bumblebee.module
+import multiprocessing
+import os
+
+def description():
+    return "Displays system load."
+
+def parameters():
+    return [
+        "load.warning: Warning threshold for the one-minute load average (defaults to 70% of the number of CPUs)",
+        "load.critical: Critical threshold for the one-minute load average (defaults 80% of the number of CPUs)"
+    ]
+
+class Module(bumblebee.module.Module):
+    def __init__(self, output, config, alias):
+        super(Module, self).__init__(output, config, alias)
+        self._cpus = 1
+        try:
+            self._cpus = multiprocessing.cpu_count()
+        except multiprocessing.NotImplementedError as e:
+            pass
+
+        output.add_callback(module=self.instance(), button=1, cmd="gnome-system-monitor")
+
+    def widgets(self):
+        self._load = os.getloadavg()
+
+        return bumblebee.output.Widget(self, "{:.02f}/{:.02f}/{:.02f}".format(
+            self._load[0], self._load[1], self._load[2]))
+
+    def warning(self, widget):
+        return self._load[0] > self._config.parameter("warning", self._cpus*0.7)
+
+    def critical(self, widget):
+        return self._load[0] > self._config.parameter("critical", self._cpus*0.8)
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4

themes/default.json

@@ -17,6 +17,9 @@
 	"cpu": {
 		"prefix": " cpu "
 	},
+	"load": {
+		"prefix": " load "
+	},
 	"disk": {
 		"prefix": " hdd "
 	},

themes/gruvbox-powerline.json

@@ -33,6 +33,9 @@
 	"cpu": {
 		"prefix": "  "
 	},
+	"load": {
+		"prefix": "  "
+	},
 	"disk": {
 		"prefix": "  "
 	},

themes/powerline.json

@@ -32,6 +32,9 @@
 	"cpu": {
 		"prefix": "  "
 	},
+	"load": {
+		"prefix": "  "
+	},
 	"disk": {
 		"prefix": "  "
 	},

themes/solarized-powerline.json

@@ -33,6 +33,9 @@
 	"cpu": {
 		"prefix": "  "
 	},
+	"load": {
+		"prefix": "  "
+	},
 	"disk": {
 		"prefix": "  "
 	},

themes/solarized.json

@@ -32,6 +32,9 @@
 	"cpu": {
 		"prefix": " cpu "
 	},
+	"load": {
+		"prefix": " load "
+	},
 	"disk": {
 		"prefix": " hdd "
 	},