[modules] re-enable arch-update

modules/contrib/arch-update.py

@@ -0,0 +1,51 @@
+"""Check updates to Arch Linux.
+
+Requires the following executable:
+    * checkupdates (from pacman-contrib)
+
+"""
+
+
+import subprocess
+import bumblebee.input
+import bumblebee.output
+import bumblebee.engine
+
+
+class Module(bumblebee.engine.Module):
+    def __init__(self, engine, config):
+        widget = bumblebee.output.Widget(full_text=self.utilization)
+        super(Module, self).__init__(engine, config, widget)
+        self.packages = self.check_updates()
+
+    def check_updates(self):
+        p = subprocess.Popen(
+                "checkupdates", stdout=subprocess.PIPE, shell=True)
+
+        p_status = p.wait()
+
+        if p_status == 0:
+            (output, err) = p.communicate()
+
+            output = output.decode('utf-8')
+            packages = output.split('\n')
+            packages.pop()
+
+            return len(packages)
+        return 0
+
+    @property
+    def _format(self):
+        return self.parameter("format", "Update Arch: {}")
+
+    def utilization(self, widget):
+        return self._format.format(self.packages)
+
+    def hidden(self):
+        return self.check_updates() == 0
+
+    def update(self, widgets):
+        self.packages = self.check_updates()
+
+    def state(self, widget):
+        return self.threshold_state(self.packages, 1, 100)