Added a re-vendor script in Python

Author: pfmoore

pip/vendor/re-vendor.py

@@ -0,0 +1,34 @@
+import os
+import sys
+import pip
+import glob
+import shutil
+
+here = os.path.abspath(os.path.dirname(__file__))
+
+def usage():
+    print("Usage: re-vendor.py [clean|vendor]")
+    sys.exit(1)
+
+def clean():
+    for fn in os.listdir(here):
+        dirname = os.path.join(here, fn)
+        if os.path.isdir(dirname):
+            shutil.rmtree(dirname)
+    # six is a single file, not a package
+    os.unlink(os.path.join(here, 'six.py'))
+
+def vendor():
+    pip.main(['install', '-t', here, '-r', 'vendor.txt'])
+    for dirname in glob.glob('*.egg-info'):
+        shutil.rmtree(dirname)
+
+if __name__ == '__main__':
+    if len(sys.argv) != 2:
+        usage()
+    if sys.argv[1] == 'clean':
+        clean()
+    elif sys.argv[1] == 'vendor':
+        vendor()
+    else:
+        usage()