[modules] Add module for displaying RAM usage

Shows free RAM, total RAM, free RAM percentage

bumblebee/modules/memory.py

@@ -0,0 +1,30 @@
+import bumblebee.module
+import psutil
+
+def fmt(num, suffix='B'):
+    for unit in [ "", "Ki", "Mi", "Gi" ]:
+        if num < 1024.0:
+            return "{:.2f}{}{}".format(num, unit, suffix)
+        num /= 1024.0
+    return "{:05.2f%}{}{}".format(num, "Gi", suffix)
+
+class Module(bumblebee.module.Module):
+    def __init__(self, args):
+        super(Module, self).__init__(args)
+        self._mem = psutil.virtual_memory()
+
+    def data(self):
+        self._mem = psutil.virtual_memory()
+
+        free = self._mem.available
+        total = self._mem.total
+
+        return "{}/{} ({:05.02f}%)".format(fmt(self._mem.available), fmt(self._mem.total), 100.0 - self._mem.percent)
+
+    def warning(self):
+        return self._mem.percent < 20
+
+    def critical(self):
+        return self._mem.percent < 10
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4