allow multiple extractors per module

gallery_dl/extractor/__init__.py

@@ -47,10 +47,10 @@ modules = [
 
 def find(url):
     """Find extractor suitable for handling the given url"""
-    for pattern, module, klass in _list_patterns():
+    for pattern, info, klass in _list_patterns():
         match = re.match(pattern, url)
         if match:
-            return klass(match), module.info
+            return klass(match), info
     return None, None
 
 # --------------------------------------------------------------------
@@ -60,15 +60,30 @@ _cache = []
 _module_iter = iter(modules)
 
 def _list_patterns():
-    """Yield all available (pattern, module, klass) tuples"""
+    """Yield all available (pattern, info, class) tuples"""
     for entry in _cache:
         yield entry
 
     for module_name in _module_iter:
         module = importlib.import_module("."+module_name, __package__)
-        klass = getattr(module, module.info["extractor"])
-        userpatterns = config.get(("extractor", module_name, "pattern"), default=[])
-        for pattern in userpatterns + module.info["pattern"]:
-            etuple = (pattern, module, klass)
-            _cache.append(etuple)
-            yield etuple
+        try:
+            klass = getattr(module, module.info["extractor"])
+            userpatterns = config.get(("extractor", module_name, "pattern"), default=[])
+            for pattern in userpatterns + module.info["pattern"]:
+                etuple = (pattern, module.info, klass)
+                _cache.append(etuple)
+                yield etuple
+        except AttributeError:
+            for klass in _get_classes(module):
+                for pattern in klass.pattern:
+                    etuple = (pattern, klass.info, klass)
+                    _cache.append(etuple)
+                    yield etuple
+
+def _get_classes(module):
+    """Return a list of all extractor classes in a module"""
+    return [
+        klass for klass in module.__dict__.values() if (
+            hasattr(klass, "info") and klass.__module__ == module.__name__
+        )
+    ]