[themes] Add cycling for individual elements

Add functionality to provide lists of values for individual elements of
a theme (e.g. the prefix) and those will be cycled for each call.

This can be used, for example, to show a "charging" symbol for the
battery that continuously goes throw all the battery stages to "animate"
the charging icon.

bumblebee/modules/battery.py

@@ -28,5 +28,7 @@ class Module(bumblebee.module.Module):
                 return "discharging_high"
             return "discharging_full"
         else:
+            if self._capacity > 95:
+                return "charged"
             return "charging"
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4

bumblebee/theme.py

@@ -11,6 +11,7 @@ class Theme:
             self._data = json.load(f)
         self._defaults = self._data.get("defaults", {})
         self._cycle = self._defaults.get("cycle", [])
+        self._modules = {}
 
         self.reset()
 
@@ -30,6 +31,16 @@ class Theme:
 
             value = state_theme.get(key, value)
 
+        if type(value) is list:
+            # cycle through the values
+            if not obj in self._modules:
+                self._modules[obj] = { "idx": 0 }
+            else:
+                self._modules[obj]["idx"] += 1
+                if self._modules[obj]["idx"] >= len(value):
+                    self._modules[obj]["idx"] = 0
+            value = value[self._modules[obj]["idx"]]
+
         return value
 
     def reset(self):