# cybertools.meta.config """ Basic implementations for configuration options """ import os from zope.interface import implementer from cybertools.meta.element import Element from cybertools.meta.interfaces import IOptions, IConfigurator from cybertools.meta.namespace import AutoNamespace, Executor, ExecutionError @implementer(IOptions) class Options(AutoNamespace): def __call__(self, key, default=None): value = self for part in key.split('.'): value = getattr(value, part, None) if isinstance(value, Element): value = default return value class GlobalOptions(Options): _filename = None _lastChange = None def __call__(self, key, default=None): if self._filename is not None: fn = self._filename if os.path.exists(fn): modified = os.path.getmtime(fn) if self._lastChange is None or self._lastChange < modified: Configurator(self).load(file=fn) self._lastChange = modified return super(GlobalOptions, self).__call__(key, default) @implementer(IConfigurator) class Configurator(object): def __init__(self, context): self.context = context def load(self, text=None, file=None): if file is not None: if hasattr(file, 'read'): text = file.read() else: # must be a file name f = open(file, 'r') text = f.read() f.close() result = Executor(self.context).execute(text) if result: raise ExecutionError('\n' + result) def dump(self, file=None): text = str(options) if file is not None: if hasattr(file, 'write'): file.write(text) else: # must be a file name f = open(file, 'w') f.write(text) f.close() return text