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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# -*- coding: utf-8 -*-

# Copyright (c) 2012 Giorgos Verigakis <verigak@gmail.com>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

from . import Progress
from .helpers import WritelnMixin


class Bar(WritelnMixin, Progress):
    width = 32
    message = ''
    suffix = '%(index)d/%(max)d'
    bar_prefix = ' |'
    bar_suffix = '| '
    empty_fill = ' '
    fill = '#'
    hide_cursor = True

    def update(self):
        filled_length = int(self.width * self.progress)
        empty_length = self.width - filled_length

        message = self.message % self
        bar = self.fill * filled_length
        empty = self.empty_fill * empty_length
        suffix = self.suffix % self
        line = ''.join([message, self.bar_prefix, bar, empty, self.bar_suffix,
                        suffix])
        self.writeln(line)


class ChargingBar(Bar):
    suffix = '%(percent)d%%'
    bar_prefix = ' '
    bar_suffix = ' '
    empty_fill = u'∙'
    fill = u'█'


class FillingSquaresBar(ChargingBar):
    empty_fill = u'▢'
    fill = u'▣'


class FillingCirclesBar(ChargingBar):
    empty_fill = u'◯'
    fill = u'◉'


class IncrementalBar(Bar):
    phases = (u' ', u'▏', u'▎', u'▍', u'▌', u'▋', u'▊', u'▉', u'█')

    def update(self):
        nphases = len(self.phases)
        expanded_length = int(nphases * self.width * self.progress)
        filled_length = int(self.width * self.progress)
        empty_length = self.width - filled_length
        phase = expanded_length - (filled_length * nphases)

        message = self.message % self
        bar = self.phases[-1] * filled_length
        current = self.phases[phase] if phase > 0 else ''
        empty = self.empty_fill * max(0, empty_length - len(current))
        suffix = self.suffix % self
        line = ''.join([message, self.bar_prefix, bar, current, empty,
                        self.bar_suffix, suffix])
        self.writeln(line)


class ShadyBar(IncrementalBar):
    phases = (u' ', u'░', u'▒', u'▓', u'█')

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