#!python

"""Bootstrap setuptools installation

If you want to use setuptools in your package's setup.py, just include this

file in the same directory with it, and add this to the top of your setup.py::

    from ez_setup import use_setuptools

    use_setuptools()

If you want to require a specific version of setuptools, set a download

mirror, or use an alternate download directory, you can do so by supplying

the appropriate options to ``use_setuptools()``.

This file can also be run as a script to install or upgrade setuptools.

"""

DEFAULT_VERSION = "0.5a13"

DEFAULT_URL     = "http://www.python.org/packages/source/s/setuptools/"

import sys, os

def use_setuptools(

    version=DEFAULT_VERSION, download_base=DEFAULT_URL, to_dir=os.curdir

):

    """Automatically find/download setuptools and make it available on sys.path

    `version` should be a valid setuptools version number that is available

    as an egg for download under the `download_base` URL (which should end with

    a '/').  `to_dir` is the directory where setuptools will be downloaded, if

    it is not already available.

    If an older version of setuptools is installed, this will print a message

    to ``sys.stderr`` and raise SystemExit in an attempt to abort the calling

    script.

    """

    try:

        import setuptools

        if setuptools.__version__ == '0.0.1':

            print >>sys.stderr, (

            "You have an obsolete version of setuptools installed.  Please\n"

            "remove it from your system entirely before rerunning this script."

            )

            sys.exit(2)

    except ImportError:

        egg = download_setuptools(version, download_base, to_dir)

        sys.path.insert(0, egg)

        import setuptools; setuptools.bootstrap_install_from = egg

    import pkg_resources

    try:

        pkg_resources.require("setuptools>="+version)

    except pkg_resources.VersionConflict:

        # XXX could we install in a subprocess here?

        print >>sys.stderr, (

            "The required version of setuptools (>=%s) is not available, and\n"

            "can't be installed while this script is running. Please install\n"

            " a more recent version first."

        ) % version

        sys.exit(2)

def download_setuptools(

    version=DEFAULT_VERSION, download_base=DEFAULT_URL, to_dir=os.curdir

):

    """Download setuptools from a specified location and return its filename

    `version` should be a valid setuptools version number that is available

    as an egg for download under the `download_base` URL (which should end

    with a '/'). `to_dir` is the directory where the egg will be downloaded.

    """

    import urllib2, shutil

    egg_name = "setuptools-%s-py%s.egg" % (version,sys.version[:3])

    url = download_base + egg_name + '.zip'  # XXX

    saveto = os.path.join(to_dir, egg_name)

    src = dst = None

    if not os.path.exists(saveto):  # Avoid repeated downloads

        try:

            from distutils import log

            log.warn("Downloading %s", url)

            src = urllib2.urlopen(url)

            # Read/write all in one block, so we don't create a corrupt file

            # if the download is interrupted.

            data = src.read()

            dst = open(saveto,"wb")

            dst.write(data)

        finally:

            if src: src.close()

            if dst: dst.close()

    return os.path.realpath(saveto)

def main(argv, version=DEFAULT_VERSION):

    """Install or upgrade setuptools and EasyInstall"""

    try:

        import setuptools

    except ImportError:

        import tempfile, shutil

        tmpdir = tempfile.mkdtemp(prefix="easy_install-")

        try:

            egg = download_setuptools(version, to_dir=tmpdir)

            sys.path.insert(0,egg)

            from setuptools.command.easy_install import main

            main(list(argv)+[egg])

        finally:

            shutil.rmtree(tmpdir)

    else:

        if setuptools.__version__ == '0.0.1':

            # tell the user to uninstall obsolete version

            use_setuptools(version)

    req = "setuptools>="+version

    import pkg_resources

    try:

        pkg_resources.require(req)

    except pkg_resources.VersionConflict:

        try:

            from setuptools.command.easy_install import main

        except ImportError:

            from easy_install import main

        main(list(argv)+[download_setuptools()])

        sys.exit(0) # try to force an exit

    else:

        if argv:

            from setuptools.command.easy_install import main

            main(argv)

        else:

            print "Setuptools version",version,"or greater has been installed."

            print '(Run "ez_setup.py -U setuptools" to reinstall or upgrade.)'

if __name__=='__main__':

    main(sys.argv[1:])

from ez_setup import use_setuptools

use_setuptools()