feat(task): adds collection of validation errors in rules task

Updates the rules transform task to make sure all errors for a
component defintion are collection during transformation and presented
back to the user to make errors easier to address at one time.

Signed-off-by: Jennifer Power <[email protected]>

trestlebot/tasks/rule_transform_task.py

@@ -93,6 +93,10 @@ def _transform_components(self, component_definition_path: pathlib.Path) -> None
         logger.debug(
             f"Transforming rules for component definition {component_definition_path.name}"
         )
+
+        # To report all rule errors at once, we collect them in a list and
+        # pretty print them in a raised exception
+        transformation_errors: List[str] = []
         for component in self.iterate_models(component_definition_path):
             for rule_path in self.iterate_models(component):
                 # Load the rule into memory as a stream to process
@@ -102,10 +106,16 @@ def _transform_components(self, component_definition_path: pathlib.Path) -> None
                     rule = self._rule_transformer.transform(rule_stream)
                     csv_builder.add_row(rule)
                 except RulesTransformerException as e:
-                    raise TaskException(
+                    transformation_errors.append(
                         f"Failed to transform rule {rule_path.name}: {e}"
                     )
 
+        if len(transformation_errors) > 0:
+            raise TaskException(
+                f"Failed to transform rules for component definition {component_definition_path.name}: \
+                    \n{', '.join(transformation_errors)}"
+            )
+
         if csv_builder.row_count == 0:
             raise TaskException(
                 f"No rules found for component definition {component_definition_path.name}"