[pygobject] Add gi.PyGIWarning and use it instead of PyGIDeprecationWarning in case the version to import wasn't

[Christoph Reiter <creiter src gnome org>]

commit 2048dc8d1d708abce7037f96483c6d776567d6b5
Author: Christoph Reiter <creiter src gnome org>
Date:   Mon Mar 2 20:58:04 2015 +0100

    Add gi.PyGIWarning and use it instead of PyGIDeprecationWarning in case the version to import wasn't 
specified.
    
    This makes the warning visible by default.
    See commit ef3bff4e570363e4f383d4cdae9cecd4073b03d8 for more info on the warning.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=727379

 gi/__init__.py   |    2 ++
 gi/gimodule.c    |    6 ++++++
 gi/importer.py   |    3 ++-
 tests/test_gi.py |   15 +++++++++++++++
 4 files changed, 25 insertions(+), 1 deletions(-)
---
diff --git a/gi/__init__.py b/gi/__init__.py
index fe4abcf..caad569 100644
--- a/gi/__init__.py
+++ b/gi/__init__.py
@@ -44,9 +44,11 @@ from ._gi import _gobject
 from ._gi import _API
 from ._gi import Repository
 from ._gi import PyGIDeprecationWarning
+from ._gi import PyGIWarning
 
 _API = _API  # pyflakes
 PyGIDeprecationWarning = PyGIDeprecationWarning
+PyGIWarning = PyGIWarning
 
 _versions = {}
 _overridesdir = os.path.join(os.path.dirname(__file__), 'overrides')
diff --git a/gi/gimodule.c b/gi/gimodule.c
index 0a5bd87..74bf7cd 100644
--- a/gi/gimodule.c
+++ b/gi/gimodule.c
@@ -32,6 +32,7 @@
 
 #include <pyglib-python-compat.h>
 
+PyObject *PyGIWarning;
 PyObject *PyGIDeprecationWarning;
 PyObject *_PyGIDefaultArgPlaceholder;
 
@@ -637,6 +638,8 @@ PYGLIB_MODULE_START(_gi, "_gi")
     _pygi_boxed_register_types (module);
     _pygi_ccallback_register_types (module);
 
+    PyGIWarning = PyErr_NewException ("gi.PyGIWarning", PyExc_Warning, NULL);
+
     /* Use RuntimeWarning as the base class of PyGIDeprecationWarning
      * for unstable (odd minor version) and use DeprecationWarning for
      * stable (even minor version). This is so PyGObject deprecations
@@ -655,6 +658,9 @@ PYGLIB_MODULE_START(_gi, "_gi")
      */
     _PyGIDefaultArgPlaceholder = PyObject_New(PyObject, &PyType_Type);
 
+    Py_INCREF (PyGIWarning);
+    PyModule_AddObject (module, "PyGIWarning", PyGIWarning);
+
     Py_INCREF(PyGIDeprecationWarning);
     PyModule_AddObject(module, "PyGIDeprecationWarning", PyGIDeprecationWarning);
 
diff --git a/gi/importer.py b/gi/importer.py
index c097b74..0acbc23 100644
--- a/gi/importer.py
+++ b/gi/importer.py
@@ -28,6 +28,7 @@ from contextlib import contextmanager
 
 import gi
 from ._gi import Repository
+from ._gi import PyGIWarning
 from .module import get_introspection_module
 from .overrides import load_overrides
 
@@ -119,7 +120,7 @@ def _check_require_version(namespace, stacklevel):
             "Use gi.require_version('%(namespace)s', '%(version)s') before "
             "import to ensure that the right version gets loaded."
             % {"namespace": namespace, "version": version},
-            ImportWarning, stacklevel=stacklevel)
+            PyGIWarning, stacklevel=stacklevel)
 
 
 class DynamicImporter(object):
diff --git a/tests/test_gi.py b/tests/test_gi.py
index 22a5738..f69a61c 100644
--- a/tests/test_gi.py
+++ b/tests/test_gi.py
@@ -17,6 +17,7 @@ from io import StringIO, BytesIO
 
 import gi
 import gi.overrides
+from gi import PyGIWarning
 from gi import PyGIDeprecationWarning
 from gi.repository import GObject, GLib, Gio
 
@@ -2773,6 +2774,20 @@ class TestProjectVersion(unittest.TestCase):
         gi.check_version("3.3.5")
 
 
+class TestGIWarning(unittest.TestCase):
+
+    def test_warning(self):
+        ignored_by_default = (DeprecationWarning, PendingDeprecationWarning,
+                              ImportWarning)
+
+        with warnings.catch_warnings(record=True) as warn:
+            warnings.simplefilter('always')
+            warnings.warn("test", PyGIWarning)
+            self.assertTrue(issubclass(warn[0].category, Warning))
+            # We don't want PyGIWarning get ignored by default
+            self.assertFalse(issubclass(warn[0].category, ignored_by_default))
+
+
 class TestDeprecation(unittest.TestCase):
     def test_method(self):
         d = GLib.Date.new()