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"""
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Shim to maintain backwards compatibility with old frontend imports.
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We have moved all contents of the old `frontend` subpackage into top-level
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subpackages (`html`, `qt` and `terminal`). This will let code that was making
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`from IPython.frontend...` calls continue working, though a warning will be
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printed.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (c) 2013, IPython Development Team.
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#
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# Distributed under the terms of the Modified BSD License.
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#
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# The full license is in the file COPYING.txt, distributed with this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from __future__ import print_function
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import sys
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import types
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#-----------------------------------------------------------------------------
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# Class declarations
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#-----------------------------------------------------------------------------
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class ShimModule(types.ModuleType):
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def __getattribute__(self, key):
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m = ("*** WARNING*** : The top-level `frontend` module has been deprecated.\n"
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"Please import %s directly from the `IPython` level." % key)
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# FIXME: I don't understand why, but if the print statement below is
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# redirected to stderr, this shim module stops working. It seems the
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# Python import machinery has problem with redirected prints happening
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# during the import process. If we can't figure out a solution, we may
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# need to leave it to print to default stdout.
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print(m)
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# FIXME: this seems to work fine, but we should replace it with an
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# __import__ call instead of using exec/eval.
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exec 'from IPython import %s' % key
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return eval(key)
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# Unconditionally insert the shim into sys.modules so that further import calls
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# trigger the custom attribute access above
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sys.modules['IPython.frontend'] = ShimModule('frontend')
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