Initial implementation of commands extension module.

discord/ext/commands/errors.py

@@ -0,0 +1,63 @@
+# -*- coding: utf-8 -*-
+"""
+The MIT License (MIT)
+
+Copyright (c) 2015-2016 Rapptz
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+"""
+
+from discord.errors import DiscordException
+
+
+__all__ = [ 'CommandError', 'MissingRequiredArgument', 'BadArgument',
+           'NoPrivateMessage', 'CheckFailure' ]
+
+class CommandError(DiscordException):
+    """The base exception type for all command related errors.
+
+    This inherits from :exc:`discord.DiscordException`.
+
+    This exception and exceptions derived from it are handled
+    in a special way as they are caught and passed into a special event
+    from :class:`Bot`\, :func:`on_command_error`.
+    """
+    pass
+
+class MissingRequiredArgument(CommandError):
+    """Exception raised when parsing a command and a parameter
+    that is required is not encountered.
+    """
+    pass
+
+class BadArgument(CommandError):
+    """Exception raised when a parsing or conversion failure is encountered
+    on an argument to pass into a command.
+    """
+    pass
+
+class NoPrivateMessage(CommandError):
+    """Exception raised when an operation does not work in private message
+    contexts.
+    """
+    pass
+
+class CheckFailure(CommandError):
+    """Exception raised when the predicates in :attr:`Command.checks` have failed."""
+    pass