handlers.py 文件源码

def get_value(self, arguments, fallback=None):
        import os
        import os.path
        import click

        try:
            path = self._locate_value(arguments, fallback=fallback)

            # TODO: do we want a --force like flag?
            if os.path.exists(path):
                click.secho("Error: --%s directory already exists, won't "
                            "overwrite." % self.cli_name, err=True, fg='red',
                            bold=True)
                ctx = click.get_current_context()
                ctx.exit(1)

            os.makedirs(path)

            def fallback_(name, cli_name):
                return os.path.join(path, name)
            return fallback_

        except ValueNotFoundException:
            # Always fail to find a value as this handler doesn't exist.
            def fail(*_):
                raise ValueNotFoundException()

            return fail