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"""
A path/directory class.
"""
import os
import shutil
import logging
from migrate import exceptions
from migrate.versioning.config import *
from migrate.versioning.util import KeyedInstance
log = logging.getLogger(__name__)
class Pathed(KeyedInstance):
"""
A class associated with a path/directory tree.
Only one instance of this class may exist for a particular file;
__new__ will return an existing instance if possible
"""
parent = None
@classmethod
def _key(cls, path):
return str(path)
def __init__(self, path):
self.path = path
if self.__class__.parent is not None:
self._init_parent(path)
def _init_parent(self, path):
"""Try to initialize this object's parent, if it has one"""
parent_path = self.__class__._parent_path(path)
self.parent = self.__class__.parent(parent_path)
log.debug("Getting parent %r:%r" % (self.__class__.parent, parent_path))
self.parent._init_child(path, self)
def _init_child(self, child, path):
"""Run when a child of this object is initialized.
Parameters: the child object; the path to this object (its
parent)
"""
@classmethod
def _parent_path(cls, path):
"""
Fetch the path of this object's parent from this object's path.
"""
# os.path.dirname(), but strip directories like files (like
# unix basename)
#
# Treat directories like files...
if path[-1] == '/':
path = path[:-1]
ret = os.path.dirname(path)
return ret
@classmethod
def require_notfound(cls, path):
"""Ensures a given path does not already exist"""
if os.path.exists(path):
raise exceptions.PathFoundError(path)
@classmethod
def require_found(cls, path):
"""Ensures a given path already exists"""
if not os.path.exists(path):
raise exceptions.PathNotFoundError(path)
def __str__(self):
return self.path
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