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# encoding: utf-8
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"""Decorators that don't go anywhere else.
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This module contains misc. decorators that don't really go with another module
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in :mod:`IPython.utils`. Beore putting something here please see if it should
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go into another topical module in :mod:`IPython.utils`.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Code
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#-----------------------------------------------------------------------------
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def flag_calls(func):
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"""Wrap a function to detect and flag when it gets called.
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This is a decorator which takes a function and wraps it in a function with
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a 'called' attribute. wrapper.called is initialized to False.
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The wrapper.called attribute is set to False right before each call to the
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wrapped function, so if the call fails it remains False. After the call
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completes, wrapper.called is set to True and the output is returned.
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Testing for truth in wrapper.called allows you to determine if a call to
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func() was attempted and succeeded."""
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def wrapper(*args,**kw):
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wrapper.called = False
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out = func(*args,**kw)
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wrapper.called = True
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return out
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wrapper.called = False
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wrapper.__doc__ = func.__doc__
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return wrapper
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