that PackageIndex handles all downloading of any kind, Installers can be
reused for multiple packages, and main() manages temporary directories and
all communication between PackageIndex and Installer.  Also, change
run_setup to take an argument sequence, because later we will probably need
other arguments to control other aspects of run_setup's behavior.

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for easy use by tools other than EasyInstall.

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for less duplication and greater clarity.

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so that setuptools can install itself in egg form.

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version checking.  Document new options for screen scraping.

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distribution names and versions in arbitrary packages that might be built
using EasyInstall.

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needs a little work to get PyPI support working, and automatic dependency
resolution.  But for now you can do:

    easy_install -s http://example.com/download.html SomePackage

And easy_install will find the best-looking download link on the page for
instaling SomePackage.

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Add a ``can_add()`` method that indicates whether a distribution matches
the collection's desired platform and Python version.  Fix a bug in
``Distribution.from_filename()`` when the filename has no Python version.

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to assist easy_install in indexing packages from PyPI.

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extraction and "egg baskets" for .zips.  Add import locking for namespace
package manipulation routines.

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installation report for .egg files/directories.

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will be kept after installation completes.  Added an "installation report"
that tells you how to use 'require()' to activate a particular package
version.  Installer.install_eggs() now returns a list of Distribution
objects for the eggs it found and installed, so that the command-line tool
can print an installation report for each one.

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name you'll use in 'require()' operations for that distribution.

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to the filesystem outside of the installer's temporary directory.  This is
accomplished by temporarily replacing 'os.*' functions and the 'open'
builtin with path-validation wrappers.

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various kludges legacy packages are using to install data in their package
directories.  Some use absolute paths in 'distribution.data_files', while
others create various subclasses of 'install_data', each with their own
way of finding out what directory to use!  So 'bdist_egg' now does all its
'install_lib' activity before 'install_data', and pokes the desired build
directory into a wide variety of places, so that all of the known kludges
so far will work correctly.  It also checks for absolute paths in
'data_files' (carefully working around other packages' 'data_files'
kludges!) and converts them back to relative ones, if they are subpaths of
site-packages.

Clearly, we need to get the word out about 'package_files' in Python 2.4
and above, and suggest using 'setuptools' for Python 2.3.

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Also, move some more imports to the top.

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EasyInstall now recognizes both 'svn' URLs (including 'svn+ssh' et al), and
notices when it connects to an HTTP server that's actually a subversion
repository.  In either case it does a subversion checkout of the package.
Also, fixed a bug on platforms with os.samefile().

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revision number, date, and/or a custom tag.  This should make it easier for
people to produce e.g. automated nightly builds of eggs.

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for searching a package database.

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path AvailableDistributions is scanning)

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distros (where setup.py is in the archive root).

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and builds and installs them as eggs, with support for managing .pth files.
Built distributions are installed in individual subdirectories, so you can
either add the directory to a .pth (automatically done by default), or you
can use pkg_resources.require() to manage your dependencies explicitly.
Because each distribution is in its own directory (or .egg file),
uninstallation and clean upgrades are trivial, without the aid of any sort
of package manager.

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distutils custom command hack in the field is to make 'install_data'
put data in with the target packages by changing the --install-data to
match --install-lib, so this should let bdist_egg work with more packages
"out of the box".

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initially and fixing them up when new eggs are added to sys.path.  At the
moment, all namespace packages are fixed up whenever any new egg is added
to sys.path, but this might not scale well if there are lots of eggs and
lots of namespace packages.  Perhaps we should limit namespace fixups to
namespace packages explicitly declared in the egg?

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types, so that the directory scanner isn't a hardcoded case.

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for packed and unpacked .egg files and .egg-info dirs.  This will need to
be refactored later to support registering adapters for arbitrary PEP 302
importers, so that it can deal with non-filesystem sys.path entries.

In the meantime, however, this means that 'require()' now works and that
intrepid souls may now witness the power of this fully operational battle
station...

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compatibility as well as platform compatibility.  Rename get_distro_source
to 'find_distributions', and get rid of intermediate distro-source objects.

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with 'require()' before the "official" version is complete.

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completes the core dependency resolution engine; all we need now is a way
to turn sys.path entries into "distribution sources" that can list
Distribution objects for inclusion in an instance of
AvailableDistributions, and the 'require("SomePkg>=2.7")' API will be
usable.

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optional dependencies can be included when processing nested dependencies.
Next up: tests for the resolve() algorithm.

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version from PKG-INFO and their dependencies from depends.txt, including
optional dependencies.

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