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Click で Python のインポート可能なパスを受け取るための型
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#!/usr/bin/env python | |
# -*- coding: utf-8 -*- | |
import importlib | |
import click | |
class ImportableType(click.ParamType): | |
''' Python のインポート可能なパスを受け取るための型 ''' | |
name = 'importable' | |
def convert(self, value, param, ctx): | |
# パスをモジュールとアトリビュートの要素に分割する | |
module_elements = value.split('.') | |
attr_elements = [] | |
while len(module_elements) > 0: | |
try: | |
module_path = '.'.join(module_elements) | |
importlib.import_module(module_path) | |
except (ImportError, ValueError): | |
last_element = module_elements.pop() | |
attr_elements.insert(0, last_element) | |
else: | |
break | |
if len(module_elements) < 1: | |
# モジュールを構成する要素がないときはパスが間違っている | |
message = 'can\'t import module from \'{value}\''.format(value=value) # noqa | |
self.fail(message, param, ctx) | |
# 見つかった最も長いパスのモジュールを読み込む | |
module_path = '.'.join(module_elements) | |
module = importlib.import_module(module_path) | |
# アトリビュートを再帰的に取得する | |
target = module | |
for attr_name in attr_elements: | |
try: | |
target = getattr(target, attr_name) | |
except AttributeError as e: | |
self.fail(str(e), param, ctx) | |
return target | |
IMPORTABLE = ImportableType() | |
@click.command() | |
@click.argument('location', type=IMPORTABLE) | |
def cmd(location): | |
click.echo(location) | |
def main(): | |
cmd() | |
if __name__ == '__main__': | |
main() |
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