[help] Add theme and module listing

Re-enable the possibility to list available themes and modules.

fixes #29

bumblebee/theme.py

@@ -3,6 +3,7 @@
 """Theme support"""
 
 import os
+import glob
 import copy
 import json
 
@@ -12,6 +13,14 @@ def theme_path():
     """Return the path of the theme directory"""
     return os.path.dirname("{}/../themes/".format(os.path.dirname(os.path.realpath(__file__))))
 
+def themes():
+    result = []
+
+    for filename in glob.iglob("{}/*.json".format(theme_path())):
+        if "test" not in filename:
+            result.append(os.path.basename(filename).replace(".json", ""))
+    return result
+
 class Theme(object):
     """Represents a collection of icons and colors"""
     def __init__(self, name):