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"""Provide Router for db migrations."""
import os
from contextlib import suppress

from peewee_migrate import Router as PeeweeRouter
from peewee_migrate.router import void


__all__ = ["Router"]


class Router(PeeweeRouter):
    """Like peewee_migrate.Router but supports multiple migrations dirs."""

    # this is a slightly edited version from peewee_migrate.router.Router
    def __init__(self, database, migrations_dirs, **kwargs):
        super().__init__(database, migrate_dir=migrations_dirs[0], **kwargs)
        self.migrations_dirs = migrations_dirs

    @property
    def todo(self):
        """Scan migrations in file system."""
        for migrate_dir in self.migrations_dirs:
            if not os.path.exists(migrate_dir):
                self.logger.warn(
                    "Migration directory: %s does not exist.", migrate_dir
                )
                os.makedirs(migrate_dir)
        migration_names = []
        for migrate_dir in self.migrations_dirs:
            migration_names += sorted(
                f[: -len(".py")]
                for f in os.listdir(migrate_dir)
                if self.filemask.match(f)
            )
        return migration_names

    def read(self, name):
        """Read migration from file."""
        scope = {}
        for migrate_dir in self.migrations_dirs:
            with suppress(FileNotFoundError):
                with open(os.path.join(migrate_dir, name + ".py")) as f:
                    code = compile(
                        f.read(), "<string>", "exec", dont_inherit=True
                    )
                    exec(code, scope)
        return scope.get("migrate", void), scope.get("rollback", void)

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