Clean up packaging.util: add __all__, remove some unused functions.

This huge module is the heir of six distutils modules, and contains
a number of miscellaneous functions.  I have attempted to help readers
of the source code with an annoted __all__.  Removed or deprecated
functions have been removed from the documentation; I’m working on
another patch to document the remaining public functions.

For the curious:

The unzip_file and untar_file were used by (or intended to be used by)
“pysetup install path/to/archive.tar.gz”, but the code presently used
shutil.unpack_archive and an helper function, so I just deleted them.
They’re still in the repository if we need them in the future.

The find_packages function is not used anymore but I want to discuss
module and package auto-discovery (in “pysetup create”) again before
removing it.

subst_vars now lives in sysconfig; rfc822_escape is inlined in
packaging.metadata.  Other functions are for internal use only, or
deprecated; I have left them out of __all__ and sprinkled TODO notes
for future cleanups.

1 files changed, 1 insertions, 1 deletions

diff --git a/Lib/packaging/config.py b/Lib/packaging/config.py
index 43263f7..83e97a9 100644
--- a/Lib/packaging/config.py
+++ b/Lib/packaging/config.py
@@ -216,7 +216,7 @@ class Config:
             for data in files.get('package_data', []):
                 data = data.split('=')
                 if len(data) != 2:
-                    continue  # XXX error should never pass silently
+                    continue  # FIXME errors should never pass silently
                 key, value = data
                 self.dist.package_data[key.strip()] = value.strip()