1 files changed, 70 insertions, 0 deletions
diff --git a/pavement.py b/pavement.py
new file mode 100644
index 00000000..81ff6f12
--- /dev/null
+++ b/pavement.py
@@ -0,0 +1,70 @@
+import re
+import sys
+import subprocess
+
+from paver.easy import task, path as Path
+
+
+def remove_all(paths):
+    for path in paths:
+        path.rmtree() if path.isdir() else path.remove()
+
+
+@task
+def update_vendored():
+    update_pkg_resources()
+    update_setuptools()
+
+
+def rewrite_packaging(pkg_files, new_root):
+    """
+    Rewrite imports in packaging to redirect to vendored copies.
+    """
+    for file in pkg_files.glob('*.py'):
+        text = file.text()
+        text = re.sub(r' (pyparsing)', rf' {new_root}.\1', text)
+        text = text.replace(
+            'from six.moves.urllib import parse',
+            'from urllib import parse',
+        )
+        file.write_text(text)
+
+
+def clean(vendor):
+    """
+    Remove all files out of the vendor directory except the meta
+    data (as pip uninstall doesn't support -t).
+    """
+    remove_all(
+        path
+        for path in vendor.glob('*')
+        if path.basename() != 'vendored.txt'
+    )
+
+
+def install(vendor):
+    clean(vendor)
+    install_args = [
+        sys.executable,
+        '-m', 'pip',
+        'install',
+        '-r', str(vendor / 'vendored.txt'),
+        '-t', str(vendor),
+    ]
+    subprocess.check_call(install_args)
+    remove_all(vendor.glob('*.dist-info'))
+    remove_all(vendor.glob('*.egg-info'))
+    remove_all(vendor.glob('six.py'))
+    (vendor / '__init__.py').write_text('')
+
+
+def update_pkg_resources():
+    vendor = Path('pkg_resources/_vendor')
+    install(vendor)
+    rewrite_packaging(vendor / 'packaging', 'pkg_resources.extern')
+
+
+def update_setuptools():
+    vendor = Path('setuptools/_vendor')
+    install(vendor)
+    rewrite_packaging(vendor / 'packaging', 'setuptools.extern')