1 files changed, 53 insertions, 0 deletions
diff --git a/Lib/packaging/command/__init__.py b/Lib/packaging/command/__init__.py
new file mode 100644
index 0000000000..87227c0b69
--- /dev/null
+++ b/Lib/packaging/command/__init__.py
@@ -0,0 +1,53 @@
+"""Subpackage containing all standard commands."""
+import os
+from packaging.errors import PackagingModuleError
+from packaging.util import resolve_name
+
+__all__ = ['get_command_names', 'set_command', 'get_command_class',
+           'STANDARD_COMMANDS']
+
+
+STANDARD_COMMANDS = [
+    # packaging
+    'check', 'test',
+    # building
+    'build', 'build_py', 'build_ext', 'build_clib', 'build_scripts', 'clean',
+    # installing
+    'install_dist', 'install_lib', 'install_headers', 'install_scripts',
+    'install_data', 'install_distinfo',
+    # distributing
+    'sdist', 'bdist', 'bdist_dumb', 'bdist_wininst',
+    'register', 'upload', 'upload_docs',
+    ]
+
+if os.name == 'nt':
+    STANDARD_COMMANDS.insert(STANDARD_COMMANDS.index('bdist_wininst'),
+                             'bdist_msi')
+
+# XXX maybe we need more than one registry, so that --list-comands can display
+# standard, custom and overriden standard commands differently
+_COMMANDS = dict((name, 'packaging.command.%s.%s' % (name, name))
+                 for name in STANDARD_COMMANDS)
+
+
+def get_command_names():
+    """Return registered commands"""
+    return sorted(_COMMANDS)
+
+
+def set_command(location):
+    cls = resolve_name(location)
+    # XXX we want to do the duck-type checking here
+    _COMMANDS[cls.get_command_name()] = cls
+
+
+def get_command_class(name):
+    """Return the registered command"""
+    try:
+        cls = _COMMANDS[name]
+    except KeyError:
+        raise PackagingModuleError("Invalid command %s" % name)
+    if isinstance(cls, str):
+        cls = resolve_name(cls)
+        _COMMANDS[name] = cls
+    return cls