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56 lines
1.5 KiB
56 lines
1.5 KiB
# coding: utf-8
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#
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# Copyright © 2010—2014 Andrey Mikhaylenko and contributors
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#
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# This file is part of Argh.
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#
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# Argh is free software under terms of the GNU Lesser
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# General Public License version 3 (LGPLv3) as published by the Free
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# Software Foundation. See the file README.rst for copying conditions.
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#
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"""
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Exceptions
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~~~~~~~~~~
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"""
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class AssemblingError(Exception):
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"""
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Raised if the parser could not be configured due to malformed
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or conflicting command declarations.
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"""
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class DispatchingError(Exception):
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"""
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Raised if the dispatching could not be completed due to misconfiguration
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which could not be determined on an earlier stage.
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"""
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class CommandError(Exception):
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"""
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Intended to be raised from within a command. The dispatcher wraps this
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exception by default and prints its message without traceback.
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Useful for print-and-exit tasks when you expect a failure and don't want
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to startle the ordinary user by the cryptic output.
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Consider the following example::
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def foo(args):
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try:
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...
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except KeyError as e:
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print(u'Could not fetch item: {0}'.format(e))
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return
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It is exactly the same as::
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def bar(args):
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try:
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...
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except KeyError as e:
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raise CommandError(u'Could not fetch item: {0}'.format(e))
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This exception can be safely used in both print-style and yield-style
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commands (see :doc:`tutorial`).
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"""
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