Add documentation for the packaging module.

This updates the user guide to refer to Packaging instead of Distutils.
Some files still require an update.

1 files changed, 53 insertions, 0 deletions

diff --git a/Doc/library/packaging.pypi.rst b/Doc/library/packaging.pypi.rst
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+:mod:`packaging.pypi` --- Interface to projects indexes
+=======================================================
+
+.. module:: packaging.pypi
+   :synopsis: Low-level and high-level APIs to query projects indexes.
+
+
+Packaging queries PyPI to get information about projects or download them.  The
+low-level facilities used internally are also part of the public API designed to
+be used by other tools.
+
+The :mod:`packaging.pypi` package provides those facilities, which can be
+used to access information about Python projects registered at indexes, the
+main one being PyPI, located ad http://pypi.python.org/.
+
+There is two ways to retrieve data from these indexes: a screen-scraping
+interface called the "simple API", and XML-RPC.  The first one uses HTML pages
+located under http://pypi.python.org/simple/, the second one makes XML-RPC
+requests to http://pypi.python.org/pypi/.  All functions and classes also work
+with other indexes such as mirrors, which typically implement only the simple
+interface.
+
+Packaging provides a class that wraps both APIs to provide full query and
+download functionality: :class:`packaging.pypi.client.ClientWrapper`.  If you
+want more control, you can use the underlying classes
+:class:`packaging.pypi.simple.Crawler` and :class:`packaging.pypi.xmlrpc.Client`
+to connect to one specific interface.
+
+
+:mod:`packaging.pypi.client` --- High-level query API
+=====================================================
+
+.. module:: packaging.pypi.client
+   :synopsis: Wrapper around :mod;`packaging.pypi.xmlrpc` and
+              :mod:`packaging.pypi.simple` to query indexes.
+
+
+This module provides a high-level API to query indexes and search
+for releases and distributions. The aim of this module is to choose the best
+way to query the API automatically, either using XML-RPC or the simple index,
+with a preference toward the latter.
+
+.. class:: ClientWrapper
+
+   Instances of this class will use the simple interface or XML-RPC requests to
+   query indexes and return :class:`packaging.pypi.dist.ReleaseInfo` and
+   :class:`packaging.pypi.dist.ReleasesList` objects.
+
+   .. method:: find_projects
+
+   .. method:: get_release
+
+   .. method:: get_releases