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+"""
+ErrorClass Plugins
+------------------
+
+ErrorClass plugins provide an easy way to add support for custom
+handling of particular classes of exceptions.
+
+An ErrorClass plugin defines one or more ErrorClasses and how each is
+handled and reported on. Each error class is stored in a different
+attribute on the result, and reported separately. Each error class must
+indicate the exceptions that fall under that class, the label to use
+for reporting, and whether exceptions of the class should be
+considered as failures for the whole test run.
+
+ErrorClasses use a declarative syntax. Assign an ErrorClass to the
+attribute you wish to add to the result object, defining the
+exceptions, label and isfailure attributes. For example, to declare an
+ErrorClassPlugin that defines TodoErrors (and subclasses of TodoError)
+as an error class with the label 'TODO' that is considered a failure,
+do this:
+
+    >>> class Todo(Exception):
+    ...     pass
+    >>> class TodoError(ErrorClassPlugin):
+    ...     todo = ErrorClass(Todo, label='TODO', isfailure=True)
+
+The MetaErrorClass metaclass translates the ErrorClass declarations
+into the tuples used by the error handling and reporting functions in
+the result. This is an internal format and subject to change; you
+should always use the declarative syntax for attaching ErrorClasses to
+an ErrorClass plugin.
+
+    >>> TodoError.errorClasses # doctest: +ELLIPSIS
+    ((<class ...Todo...>, ('todo', 'TODO', True)),)
+
+Let's see the plugin in action. First some boilerplate.
+
+    >>> import sys
+    >>> import unittest
+    >>> try:
+    ...     # 2.7+
+    ...     from unittest.runner import _WritelnDecorator
+    ... except ImportError:
+    ...     from unittest import _WritelnDecorator
+    ... 
+    >>> buf = _WritelnDecorator(sys.stdout)
+
+Now define a test case that raises a Todo.
+
+    >>> class TestTodo(unittest.TestCase):
+    ...     def runTest(self):
+    ...         raise Todo("I need to test something")
+    >>> case = TestTodo()
+
+Prepare the result using our plugin. Normally this happens during the
+course of test execution within nose -- you won't be doing this
+yourself. For the purposes of this testing document, I'm stepping
+through the internal process of nose so you can see what happens at
+each step.
+
+    >>> plugin = TodoError()
+    >>> from nose.result import _TextTestResult
+    >>> result = _TextTestResult(stream=buf, descriptions=0, verbosity=2)
+    >>> plugin.prepareTestResult(result)
+
+Now run the test. TODO is printed.
+
+    >>> _ = case(result) # doctest: +ELLIPSIS
+    runTest (....TestTodo) ... TODO: I need to test something
+
+Errors and failures are empty, but todo has our test:
+
+    >>> result.errors
+    []
+    >>> result.failures
+    []
+    >>> result.todo # doctest: +ELLIPSIS
+    [(<....TestTodo testMethod=runTest>, '...Todo: I need to test something\\n')]
+    >>> result.printErrors() # doctest: +ELLIPSIS
+    <BLANKLINE>
+    ======================================================================
+    TODO: runTest (....TestTodo)
+    ----------------------------------------------------------------------
+    Traceback (most recent call last):
+    ...
+    ...Todo: I need to test something
+    <BLANKLINE>
+
+Since we defined a Todo as a failure, the run was not successful.
+
+    >>> result.wasSuccessful()
+    False
+"""
+
+from nose.pyversion import make_instancemethod
+from nose.plugins.base import Plugin
+from nose.result import TextTestResult
+from nose.util import isclass
+
+class MetaErrorClass(type):
+    """Metaclass for ErrorClassPlugins that allows error classes to be
+    set up in a declarative manner.
+    """
+    def __init__(self, name, bases, attr):
+        errorClasses = []
+        for name, detail in list(attr.items()):
+            if isinstance(detail, ErrorClass):
+                attr.pop(name)
+                for cls in detail:
+                    errorClasses.append(
+                        (cls, (name, detail.label, detail.isfailure)))
+        super(MetaErrorClass, self).__init__(name, bases, attr)
+        self.errorClasses = tuple(errorClasses)
+
+
+class ErrorClass(object):
+    def __init__(self, *errorClasses, **kw):
+        self.errorClasses = errorClasses
+        try:
+            for key in ('label', 'isfailure'):
+                setattr(self, key, kw.pop(key))
+        except KeyError:
+            raise TypeError("%r is a required named argument for ErrorClass"
+                            % key)
+
+    def __iter__(self):
+        return iter(self.errorClasses)
+
+
+class ErrorClassPlugin(Plugin, metaclass=MetaErrorClass):
+    """
+    Base class for ErrorClass plugins. Subclass this class and declare the
+    exceptions that you wish to handle as attributes of the subclass.
+    """
+    score = 1000
+    errorClasses = ()
+
+    def addError(self, test, err):
+        err_cls, a, b = err
+        if not isclass(err_cls):
+            return
+        classes = [e[0] for e in self.errorClasses]
+        if [c for c in classes if issubclass(err_cls, c)]:
+            return True
+
+    def prepareTestResult(self, result):
+        if not hasattr(result, 'errorClasses'):
+            self.patchResult(result)
+        for cls, (storage_attr, label, isfail) in self.errorClasses:
+            if cls not in result.errorClasses:
+                storage = getattr(result, storage_attr, [])
+                setattr(result, storage_attr, storage)
+                result.errorClasses[cls] = (storage, label, isfail)
+
+    def patchResult(self, result):
+        result.printLabel = print_label_patch(result)
+        result._orig_addError, result.addError = \
+            result.addError, add_error_patch(result)
+        result._orig_wasSuccessful, result.wasSuccessful = \
+            result.wasSuccessful, wassuccessful_patch(result)
+        if hasattr(result, 'printErrors'):
+            result._orig_printErrors, result.printErrors = \
+                result.printErrors, print_errors_patch(result)
+        if hasattr(result, 'addSkip'):
+            result._orig_addSkip, result.addSkip = \
+                result.addSkip, add_skip_patch(result)
+        result.errorClasses = {}
+
+
+def add_error_patch(result):
+    """Create a new addError method to patch into a result instance
+    that recognizes the errorClasses attribute and deals with
+    errorclasses correctly.
+    """
+    return make_instancemethod(TextTestResult.addError, result)
+
+
+def print_errors_patch(result):
+    """Create a new printErrors method that prints errorClasses items
+    as well.
+    """
+    return make_instancemethod(TextTestResult.printErrors, result)
+
+
+def print_label_patch(result):
+    """Create a new printLabel method that prints errorClasses items
+    as well.
+    """
+    return make_instancemethod(TextTestResult.printLabel, result)
+
+
+def wassuccessful_patch(result):
+    """Create a new wasSuccessful method that checks errorClasses for
+    exceptions that were put into other slots than error or failure
+    but that still count as not success.
+    """
+    return make_instancemethod(TextTestResult.wasSuccessful, result)
+
+
+def add_skip_patch(result):
+    """Create a new addSkip method to patch into a result instance
+    that delegates to addError.
+    """
+    return make_instancemethod(TextTestResult.addSkip, result)
+
+
+if __name__ == '__main__':
+    import doctest
+    doctest.testmod()
+