晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。   林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。   见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝)   既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。   南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。 .
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Current File : //opt/imunify360/venv/lib64/python3.11/site-packages/pip/_internal/commands/index.py
import logging
from optparse import Values
from typing import Any, Iterable, List, Optional, Union

from pip._vendor.packaging.version import LegacyVersion, Version

from pip._internal.cli import cmdoptions
from pip._internal.cli.req_command import IndexGroupCommand
from pip._internal.cli.status_codes import ERROR, SUCCESS
from pip._internal.commands.search import print_dist_installation_info
from pip._internal.exceptions import CommandError, DistributionNotFound, PipError
from pip._internal.index.collector import LinkCollector
from pip._internal.index.package_finder import PackageFinder
from pip._internal.models.selection_prefs import SelectionPreferences
from pip._internal.models.target_python import TargetPython
from pip._internal.network.session import PipSession
from pip._internal.utils.misc import write_output

logger = logging.getLogger(__name__)


class IndexCommand(IndexGroupCommand):
    """
    Inspect information available from package indexes.
    """

    ignore_require_venv = True
    usage = """
        %prog versions <package>
    """

    def add_options(self) -> None:
        cmdoptions.add_target_python_options(self.cmd_opts)

        self.cmd_opts.add_option(cmdoptions.ignore_requires_python())
        self.cmd_opts.add_option(cmdoptions.pre())
        self.cmd_opts.add_option(cmdoptions.no_binary())
        self.cmd_opts.add_option(cmdoptions.only_binary())

        index_opts = cmdoptions.make_option_group(
            cmdoptions.index_group,
            self.parser,
        )

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

    def run(self, options: Values, args: List[str]) -> int:
        handlers = {
            "versions": self.get_available_package_versions,
        }

        logger.warning(
            "pip index is currently an experimental command. "
            "It may be removed/changed in a future release "
            "without prior warning."
        )

        # Determine action
        if not args or args[0] not in handlers:
            logger.error(
                "Need an action (%s) to perform.",
                ", ".join(sorted(handlers)),
            )
            return ERROR

        action = args[0]

        # Error handling happens here, not in the action-handlers.
        try:
            handlers[action](options, args[1:])
        except PipError as e:
            logger.error(e.args[0])
            return ERROR

        return SUCCESS

    def _build_package_finder(
        self,
        options: Values,
        session: PipSession,
        target_python: Optional[TargetPython] = None,
        ignore_requires_python: Optional[bool] = None,
    ) -> PackageFinder:
        """
        Create a package finder appropriate to the index command.
        """
        link_collector = LinkCollector.create(session, options=options)

        # Pass allow_yanked=False to ignore yanked versions.
        selection_prefs = SelectionPreferences(
            allow_yanked=False,
            allow_all_prereleases=options.pre,
            ignore_requires_python=ignore_requires_python,
        )

        return PackageFinder.create(
            link_collector=link_collector,
            selection_prefs=selection_prefs,
            target_python=target_python,
        )

    def get_available_package_versions(self, options: Values, args: List[Any]) -> None:
        if len(args) != 1:
            raise CommandError("You need to specify exactly one argument")

        target_python = cmdoptions.make_target_python(options)
        query = args[0]

        with self._build_session(options) as session:
            finder = self._build_package_finder(
                options=options,
                session=session,
                target_python=target_python,
                ignore_requires_python=options.ignore_requires_python,
            )

            versions: Iterable[Union[LegacyVersion, Version]] = (
                candidate.version for candidate in finder.find_all_candidates(query)
            )

            if not options.pre:
                # Remove prereleases
                versions = (
                    version for version in versions if not version.is_prerelease
                )
            versions = set(versions)

            if not versions:
                raise DistributionNotFound(
                    "No matching distribution found for {}".format(query)
                )

            formatted_versions = [str(ver) for ver in sorted(versions, reverse=True)]
            latest = formatted_versions[0]

        write_output("{} ({})".format(query, latest))
        write_output("Available versions: {}".format(", ".join(formatted_versions)))
        print_dist_installation_info(query, latest)

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