--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/planemo/lib/python3.7/site-packages/galaxy/util/plugin_config.py	Fri Jul 31 00:32:28 2020 -0400
@@ -0,0 +1,96 @@
+import collections
+
+try:
+    import yaml
+except ImportError:
+    yaml = None
+
+from galaxy.util import parse_xml
+from galaxy.util.submodules import import_submodules
+
+
+PluginConfigSource = collections.namedtuple('PluginConfigSource', ['type', 'source'])
+
+
+def plugins_dict(module, plugin_type_identifier):
+    """ Walk through all classes in submodules of module and find ones labelled
+    with specified plugin_type_identifier and throw in a dictionary to allow
+    constructions from plugins by these types later on.
+    """
+    plugin_dict = {}
+
+    for plugin_module in import_submodules(module, ordered=True):
+        # FIXME: this is not how one is suppose to use __all__ why did you do
+        # this past John?
+        for clazz in getattr(plugin_module, "__all__", []):
+            try:
+                clazz = getattr(plugin_module, clazz)
+            except TypeError:
+                clazz = clazz
+            plugin_type = getattr(clazz, plugin_type_identifier, None)
+            if plugin_type:
+                plugin_dict[plugin_type] = clazz
+
+    return plugin_dict
+
+
+def load_plugins(plugins_dict, plugin_source, extra_kwds=None, plugin_type_keys=('type',)):
+    if extra_kwds is None:
+        extra_kwds = {}
+    if plugin_source.type == "xml":
+        return __load_plugins_from_element(plugins_dict, plugin_source.source, extra_kwds)
+    else:
+        return __load_plugins_from_dicts(plugins_dict, plugin_source.source, extra_kwds, plugin_type_keys=plugin_type_keys)
+
+
+def __load_plugins_from_element(plugins_dict, plugins_element, extra_kwds):
+    plugins = []
+
+    for plugin_element in plugins_element:
+        plugin_type = plugin_element.tag
+        plugin_kwds = dict(plugin_element.items())
+        plugin_kwds.update(extra_kwds)
+        try:
+            plugin_klazz = plugins_dict[plugin_type]
+        except KeyError:
+            template = "Failed to find plugin of type [%s] in available plugin types %s"
+            message = template % (plugin_type, str(plugins_dict.keys()))
+            raise Exception(message)
+
+        plugin = plugin_klazz(**plugin_kwds)
+        plugins.append(plugin)
+
+    return plugins
+
+
+def __load_plugins_from_dicts(plugins_dict, configs, extra_kwds, plugin_type_keys):
+    plugins = []
+
+    for config in configs:
+        plugin_type = None
+        for plugin_type_key in plugin_type_keys:
+            if plugin_type_key in config:
+                plugin_type = config[plugin_type_key]
+                break
+        assert plugin_type is not None, "Could not determine plugin type for [%s]" % config
+        plugin_kwds = config
+        plugin_kwds.update(extra_kwds)
+        plugin = plugins_dict[plugin_type](**plugin_kwds)
+        plugins.append(plugin)
+
+    return plugins
+
+
+def plugin_source_from_path(path):
+    if path.endswith(".yaml") or path.endswith(".yml") or path.endswith(".yaml.sample") or path.endswith(".yml.sample"):
+        return PluginConfigSource('dict', __read_yaml(path))
+    else:
+        return PluginConfigSource('xml', parse_xml(path, remove_comments=True).getroot())
+
+
+def __read_yaml(path):
+    if yaml is None:
+        raise ImportError("Attempting to read YAML configuration file - but PyYAML dependency unavailable.")
+
+    with open(path, "rb") as f:
+        return yaml.safe_load(f)