Add 'launch' hook, based on pip.utils.setuptools_build

1 files changed, 28 insertions, 0 deletions

diff --git a/setuptools/launch.py b/setuptools/launch.py
new file mode 100644
index 00000000..68cce681
--- /dev/null
+++ b/setuptools/launch.py
@@ -0,0 +1,28 @@
+"""
+Launch the Python script on the command line after
+setuptools is bootstrapped via import.
+"""
+
+# Note that setuptools gets imported implicitly by the
+# invocation of this script using python -m setuptools.launch
+
+import tokenize
+import sys
+
+
+def load():
+	"""
+	Load the script in sys.argv[1] and run it as if it had
+	been invoked naturally.
+	"""
+	globals()['__file__'] = sys.argv[1]
+	sys.argv[:] = sys.argv[1:]
+
+	open_ = getattr(tokenize, 'open', open)
+	script = open_(__file__).read()
+	norm_script = script.replace('\\r\\n', '\\n')
+	return compile(norm_script, __file__, 'exec')
+
+
+if __name__ == '__main__':
+	exec(load())