Don't baulk on intent(in) pointers (#120)

* Replace `setup.py` script with `stylist.toml` configuration file.

* Turned out the `.toml` file wasn't being used.

* Discovered mistake in pull request workflow.

* Since `setup.py` has been removed we can't check it with `mypy`

* Added Conda Forge badge to ReadMe.

* Constrain fParser version.

* Remove reference to setup.py from documentation.

* Pointer initialisation rules doesn't apply to abstract interfaces.

* Or normal interfaces.

source/stylist/fortran.py

@@ -393,6 +393,13 @@ def _data(root: Fortran2003.Base,
                                                   attribute_specification):
                 continue
 
+            # @todo This is quite ugly
+            #
+            potential_interface_block = data_declaration.parent.parent.parent
+            if isinstance(potential_interface_block,
+                          Fortran2003.Interface_Block):
+                continue
+
             for entity in fp_walk(data_declaration, entity_declaration):
                 if str(fp_get_child(entity, Fortran2003.Name)) in ignore_names:
                     continue

unit-tests/fortran_pointer_init_test.py

@@ -166,8 +166,8 @@ def test_pointer_init(self,
 
     def test_arguments_without_intent(self):
         """
-        Checks that the rule can cope with arguments which do not specify an
-        intent.
+        Checks that the rule can cope with arguments which should not specify
+        an intent.
         """
         source_text = dedent('''
                              subroutine my_sub( first, second )
@@ -192,3 +192,29 @@ def test_arguments_without_intent(self):
 
         issue_descriptions = [str(issue) for issue in issues]
         assert issue_descriptions == []
+
+    def test_abstract_interface(self):
+        """
+        Checks that the rule can cope with arguments which are intent in and
+        user defined types.
+        """
+        source_text = dedent(
+            '''
+            module this_mod
+              abstract interface
+                subroutine their_sub( first, second )
+                  implicit none
+                  type(thang_type), intent(in), pointer :: first
+                  class(thang_type), pointer, intent(in) :: second
+                end subroutine their_sub
+              end interface
+            end module this_mod
+            ''').strip()
+        source_reader = SourceStringReader(source_text)
+        source = FortranSource(source_reader)
+
+        test_unit = stylist.fortran.MissingPointerInit()
+        issues = test_unit.examine(source)
+
+        issue_descriptions = [str(issue) for issue in issues]
+        assert issue_descriptions == []