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 : //lib/python2.7/site-packages/pip/vcs/mercurial.py
from __future__ import absolute_import

import logging
import os
import tempfile

from pip.utils import display_path, rmtree
from pip.vcs import vcs, VersionControl
from pip.download import path_to_url
from pip._vendor.six.moves import configparser


logger = logging.getLogger(__name__)


class Mercurial(VersionControl):
    name = 'hg'
    dirname = '.hg'
    repo_name = 'clone'
    schemes = ('hg', 'hg+http', 'hg+https', 'hg+ssh', 'hg+static-http')

    def export(self, location):
        """Export the Hg repository at the url to the destination location"""
        temp_dir = tempfile.mkdtemp('-export', 'pip-')
        self.unpack(temp_dir)
        try:
            self.run_command(
                ['archive', location], show_stdout=False, cwd=temp_dir)
        finally:
            rmtree(temp_dir)

    def switch(self, dest, url, rev_options):
        repo_config = os.path.join(dest, self.dirname, 'hgrc')
        config = configparser.SafeConfigParser()
        try:
            config.read(repo_config)
            config.set('paths', 'default', url)
            with open(repo_config, 'w') as config_file:
                config.write(config_file)
        except (OSError, configparser.NoSectionError) as exc:
            logger.warning(
                'Could not switch Mercurial repository to %s: %s', url, exc,
            )
        else:
            self.run_command(['update', '-q'] + rev_options, cwd=dest)

    def update(self, dest, rev_options):
        self.run_command(['pull', '-q'], cwd=dest)
        self.run_command(['update', '-q'] + rev_options, cwd=dest)

    def obtain(self, dest):
        url, rev = self.get_url_rev()
        if rev:
            rev_options = [rev]
            rev_display = ' (to revision %s)' % rev
        else:
            rev_options = []
            rev_display = ''
        if self.check_destination(dest, url, rev_options, rev_display):
            logger.info(
                'Cloning hg %s%s to %s',
                url,
                rev_display,
                display_path(dest),
            )
            self.run_command(['clone', '--noupdate', '-q', url, dest])
            self.run_command(['update', '-q'] + rev_options, cwd=dest)

    def get_url(self, location):
        url = self.run_command(
            ['showconfig', 'paths.default'],
            show_stdout=False, cwd=location).strip()
        if self._is_local_repository(url):
            url = path_to_url(url)
        return url.strip()

    def get_revision(self, location):
        current_revision = self.run_command(
            ['parents', '--template={rev}'],
            show_stdout=False, cwd=location).strip()
        return current_revision

    def get_revision_hash(self, location):
        current_rev_hash = self.run_command(
            ['parents', '--template={node}'],
            show_stdout=False, cwd=location).strip()
        return current_rev_hash

    def get_src_requirement(self, dist, location):
        repo = self.get_url(location)
        if not repo.lower().startswith('hg:'):
            repo = 'hg+' + repo
        egg_project_name = dist.egg_name().split('-', 1)[0]
        if not repo:
            return None
        current_rev_hash = self.get_revision_hash(location)
        return '%s@%s#egg=%s' % (repo, current_rev_hash, egg_project_name)

    def check_version(self, dest, rev_options):
        """Always assume the versions don't match"""
        return False

vcs.register(Mercurial)

haha - 2025