Remove Python version check warning

utt/__main__.py

@@ -1,12 +1,40 @@
-from .check_python_version import warn_if_python_version_is_unsupported
+import argparse
+import importlib
+import pkgutil
+import sys
 
-warn_if_python_version_is_unsupported()
+import utt.plugins
+from utt.api import _v1
+from utt.components.commands import Commands
+
+
+def iter_namespace(ns_pkg):
+    # Specifying the second argument (prefix) to iter_modules makes the
+    # returned name an absolute name instead of a relative one. This allows
+    # import_module to work without having to do additional modification to
+    # the name.
+    #
+    # Source: https://packaging.python.org/guides/creating-and-discovering-plugins/
+    return pkgutil.iter_modules(ns_pkg.__path__, ns_pkg.__name__ + ".")
+
+
+def load_plugins():
+    for _, name, _ in iter_namespace(utt.plugins):
+        importlib.import_module(name)
 
 
 def main():
-    from utt.main import main
+    if len(sys.argv) == 1:
+        sys.argv.append("--help")
 
-    main()
+    load_plugins()
+
+    command_name = _v1._private.container[argparse.Namespace].command
+
+    commands: Commands = _v1._private.container[Commands]
+    for command in commands:
+        if command.name == command_name:
+            _v1._private.container[command.handler_class]()
 
 
 if __name__ == "__main__":