added a very basic frequency module

bumblebee/modules/frequency.py

@@ -0,0 +1,31 @@
+# pylint: disable=C0111,R0903
+
+"""Displays CPU frequency.
+"""
+
+import subprocess 
+import bumblebee.input
+import bumblebee.output
+import bumblebee.engine
+
+ 
+class Module(bumblebee.engine.Module):
+    def __init__(self, engine, config):
+        super(Module, self).__init__(engine, config,
+            bumblebee.output.Widget(full_text=self.frequency)
+        )
+        self._frequency = 0
+        
+    def frequency(self, widget):
+        return self._frequency
+
+    def getFrequency(self):
+        cmd = "cpupower frequency-info  | grep \"Hz\" | grep \"current CPU\" | xargs |  cut -d ' ' -f 4-5"
+        return subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE).stdout.read().decode("utf-8").rstrip()
+
+    def update(self, widgets):
+        self._frequency = self.getFrequency()        
+
+
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4