Move new utilities to the util namespace

1 files changed, 52 insertions, 0 deletions

diff --git a/botcore/utils/extensions.py b/botcore/utils/extensions.py
new file mode 100644
index 00000000..c8f200ad
--- /dev/null
+++ b/botcore/utils/extensions.py
@@ -0,0 +1,52 @@
+"""Utilities for loading discord extensions."""
+
+import importlib
+import inspect
+import pkgutil
+import types
+from typing import NoReturn
+
+
+def unqualify(name: str) -> str:
+    """
+    Return an unqualified name given a qualified module/package `name`.
+
+    Args:
+        name: The module name to unqualify.
+
+    Returns:
+        The unqualified module name.
+    """
+    return name.rsplit(".", maxsplit=1)[-1]
+
+
+def walk_extensions(module: types.ModuleType) -> frozenset[str]:
+    """
+    Yield extension names from the bot.exts subpackage.
+
+    Args:
+        module (types.ModuleType): The module to look for extensions in.
+
+    Returns:
+        A set of strings that can be passed directly to :obj:`discord.ext.commands.Bot.load_extension`.
+    """
+
+    def on_error(name: str) -> NoReturn:
+        raise ImportError(name=name)  # pragma: no cover
+
+    modules = set()
+
+    for module_info in pkgutil.walk_packages(module.__path__, f"{module.__name__}.", onerror=on_error):
+        if unqualify(module_info.name).startswith("_"):
+            # Ignore module/package names starting with an underscore.
+            continue
+
+        if module_info.ispkg:
+            imported = importlib.import_module(module_info.name)
+            if not inspect.isfunction(getattr(imported, "setup", None)):
+                # If it lacks a setup function, it's not an extension.
+                continue
+
+        modules.add(module_info.name)
+
+    return frozenset(modules)