Mock dependencies when building documentation

docs/conf.py

@@ -240,3 +240,28 @@ texinfo_documents = [
 
 # How to display URL addresses: 'footnote', 'no', or 'inline'.
 #texinfo_show_urls = 'footnote'
+
+
+# -- Mock Dependencies ---------------------------------------------------------
+
+class Mock(object):
+    def __init__(self, *args, **kwargs):
+        pass
+
+    def __call__(self, *args, **kwargs):
+        return Mock()
+
+    @classmethod
+    def __getattr__(cls, name):
+        if name in ("__file__", "__path__"):
+            return "/dev/null"
+        elif name[0] == name[0].upper():
+            mockType = type(name, (), {})
+            mockType.__module__ = __name__
+            return mockType
+        else:
+            return Mock()
+
+MOCK_MODULES = ["cffi"]
+for mod_name in MOCK_MODULES:
+    sys.modules[mod_name] = Mock()