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//opt/alt/python34/lib/python3.4/site-packages/pip/commands/list.py

from pip.basecommand import Command
from pip.exceptions import DistributionNotFound, BestVersionAlreadyInstalled
from pip.index import PackageFinder
from pip.log import logger
from pip.req import InstallRequirement
from pip.util import get_installed_distributions, dist_is_editable
from pip.cmdoptions import make_option_group, index_group

class ListCommand(Command):
    """List installed packages, including editables."""
    name = 'list'
    usage = """
      %prog [options]"""
    summary = 'List installed packages.'

# distributions to skip (python itself is reported by pkg_resources.working_set)
    skip = ['python']

def __init__(self, *args, **kw):
        super(ListCommand, self).__init__(*args, **kw)

cmd_opts = self.cmd_opts

cmd_opts.add_option(
            '-o', '--outdated',
            action='store_true',
            default=False,
            help='List outdated packages (excluding editables)')
        cmd_opts.add_option(
            '-u', '--uptodate',
            action='store_true',
            default=False,
            help='List uptodate packages (excluding editables)')
        cmd_opts.add_option(
            '-e', '--editable',
            action='store_true',
            default=False,
            help='List editable projects.')
        cmd_opts.add_option(
            '-l', '--local',
            action='store_true',
            default=False,
            help='If in a virtualenv that has global access, do not list globally-installed packages.')

cmd_opts.add_option(
            '--pre',
            action='store_true',
            default=False,
            help="Include pre-release and development versions. By default, pip only finds stable versions.")

index_opts = make_option_group(index_group, self.parser)

self.parser.insert_option_group(0, index_opts)
        self.parser.insert_option_group(0, cmd_opts)

def _build_package_finder(self, options, index_urls, session):
        """
        Create a package finder appropriate to this list command.
        """
        return PackageFinder(find_links=options.find_links,
                             index_urls=index_urls,
                             allow_external=options.allow_external,
                             allow_unverified=options.allow_unverified,
                             allow_all_external=options.allow_all_external,
                             allow_all_prereleases=options.pre,
                             process_dependency_links=
                                options.process_dependency_links,
                             session=session,
                        )

def run(self, options, args):
        if options.outdated:
            self.run_outdated(options)
        elif options.uptodate:
            self.run_uptodate(options)
        elif options.editable:
            self.run_editables(options)
        else:
            self.run_listing(options)

def run_outdated(self, options):
        for dist, remote_version_raw, remote_version_parsed in self.find_packages_latests_versions(options):
            if remote_version_parsed > dist.parsed_version:
                logger.notify('%s (Current: %s Latest: %s)' % (dist.project_name,
                    dist.version, remote_version_raw))

def find_packages_latests_versions(self, options):
        index_urls = [options.index_url] + options.extra_index_urls
        if options.no_index:
            logger.notify('Ignoring indexes: %s' % ','.join(index_urls))
            index_urls = []

if options.use_mirrors:
            logger.deprecated("1.7",
                        "--use-mirrors has been deprecated and will be removed"
                        " in the future. Explicit uses of --index-url and/or "
                        "--extra-index-url is suggested.")

if options.mirrors:
            logger.deprecated("1.7",
                        "--mirrors has been deprecated and will be removed in "
                        " the future. Explicit uses of --index-url and/or "
                        "--extra-index-url is suggested.")
            index_urls += options.mirrors

dependency_links = []
        for dist in get_installed_distributions(local_only=options.local, skip=self.skip):
            if dist.has_metadata('dependency_links.txt'):
                dependency_links.extend(
                    dist.get_metadata_lines('dependency_links.txt'),
                )

session = self._build_session(options)

finder = self._build_package_finder(options, index_urls, session)
        finder.add_dependency_links(dependency_links)

installed_packages = get_installed_distributions(local_only=options.local, include_editables=False, skip=self.skip)
        for dist in installed_packages:
            req = InstallRequirement.from_line(dist.key, None)
            try:
                link = finder.find_requirement(req, True)

# If link is None, means installed version is most up-to-date
                if link is None:
                    continue
            except DistributionNotFound:
                continue
            except BestVersionAlreadyInstalled:
                remote_version = req.installed_version
            else:
                # It might be a good idea that link or finder had a public method
                # that returned version
                remote_version = finder._link_package_versions(link, req.name)[0]
                remote_version_raw = remote_version[2]
                remote_version_parsed = remote_version[0]
            yield dist, remote_version_raw, remote_version_parsed

def run_listing(self, options):
        installed_packages = get_installed_distributions(local_only=options.local, skip=self.skip)
        self.output_package_listing(installed_packages)

def run_editables(self, options):
        installed_packages = get_installed_distributions(local_only=options.local, editables_only=True)
        self.output_package_listing(installed_packages)

def output_package_listing(self, installed_packages):
        installed_packages = sorted(installed_packages, key=lambda dist: dist.project_name.lower())
        for dist in installed_packages:
            if dist_is_editable(dist):
                line = '%s (%s, %s)' % (dist.project_name, dist.version, dist.location)
            else:
                line = '%s (%s)' % (dist.project_name, dist.version)
            logger.notify(line)

def run_uptodate(self, options):
        uptodate = []
        for dist, remote_version_raw, remote_version_parsed in self.find_packages_latests_versions(options):
            if dist.parsed_version == remote_version_parsed:
                uptodate.append(dist)
        self.output_package_listing(uptodate)