upstream/ipython Files · IPython/utils/nested_context.py

normalize unicode notebook filenames...

normalize unicode notebook filenames used in comparison check for notebook name change. Unless the filenames are normalized, unchanged names may result in false positives for a name change (e.g. OS X uses NFD on the filesystem, so u'\xfc' roundtripped to the filesystem will be u'u\u0308'), which can result in the first save of a notebook after open performing the following actions: 1. save the recently opened notebook 2. `old_name != new_name`, so name change detected 3. delete old_name (which is actually new_name), which ultimately deletes the just-saved notebook In master, this has a symptom of the first checkpoint failing because the first save actually deleted the file, and you can't checkpoint a notebook that doesn't exist. closes

Thomas Kluyver - - Load All Authors

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             nested_context.py
        
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      """Backwards compatibility - we use contextlib.nested to support Python 2.6,

      but it's removed in Python 3.2."""

      # TODO : Remove this once we drop support for Python 2.6, and use

      # "with a, b:" instead.

      import sys

      from contextlib import contextmanager

      @contextmanager

      def nested(*managers):

          """Combine multiple context managers into a single nested context manager.

         This function has been deprecated in favour of the multiple manager form

         of the with statement.

         The one advantage of this function over the multiple manager form of the

         with statement is that argument unpacking allows it to be

         used with a variable number of context managers as follows::

            with nested(*managers):

                do_something()

          """

          exits = []

          vars = []

          exc = (None, None, None)

          try:

              for mgr in managers:

                  exit = mgr.__exit__

                  enter = mgr.__enter__

                  vars.append(enter())

                  exits.append(exit)

              yield vars

          except:

              exc = sys.exc_info()

          finally:

              while exits:

                  exit = exits.pop()

                  try:

                      if exit(*exc):

                          exc = (None, None, None)

                  except:

                      exc = sys.exc_info()

              if exc != (None, None, None):

                  # Don't rely on sys.exc_info() still containing

                  # the right information. Another exception may

                  # have been raised and caught by an exit method

                  raise exc[0], exc[1], exc[2]

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				"""Backwards compatibility - we use contextlib.nested to support Python 2.6,
				but it's removed in Python 3.2."""

				# TODO : Remove this once we drop support for Python 2.6, and use
				# "with a, b:" instead.

				import sys

				from contextlib import contextmanager

				@contextmanager
				def nested(*managers):
				"""Combine multiple context managers into a single nested context manager.

				This function has been deprecated in favour of the multiple manager form
				of the with statement.

				The one advantage of this function over the multiple manager form of the
				with statement is that argument unpacking allows it to be
				used with a variable number of context managers as follows::

				with nested(*managers):
				do_something()

				"""
				exits = []
				vars = []
				exc = (None, None, None)
				try:
				for mgr in managers:
				exit = mgr.__exit__
				enter = mgr.__enter__
				vars.append(enter())
				exits.append(exit)
				yield vars
				except:
				exc = sys.exc_info()
				finally:
				while exits:
				exit = exits.pop()
				try:
				if exit(*exc):
				exc = (None, None, None)
				except:
				exc = sys.exc_info()
				if exc != (None, None, None):
				# Don't rely on sys.exc_info() still containing
				# the right information. Another exception may
				# have been raised and caught by an exit method
				raise exc[0], exc[1], exc[2]