Added InvalidRegExpError in the filtering module.

This is a better solution than simply relying on ValueError and also
helps us to maintain compatibility with all our other exceptions (it gives
us a msg attribute that we can access when catching the error).

Also localized the string for InvalidRegExpError.

gitinspector/filtering.py

@@ -28,6 +28,11 @@ import textwrap
 __filters__ = []
 __filtered_files__ = set()
 
+class InvalidRegExpError(ValueError):
+	def __init__(self, msg):
+		super(InvalidRegExpError, self).__init__(msg)
+		self.msg = msg
+
 def get():
 	return __filters__
 
@@ -51,7 +56,7 @@ def set_filtered(file_name):
 					__filtered_files__.add(string)
 					return True
 			except:
-				raise ValueError("Invalid regular expression specified")
+				raise InvalidRegExpError(_("invalid regular expression specified"))
 	return False
 
 FILTERING_INFO_TEXT = N_("The following files were excluded from the statistics due to the specified exclusion patterns")

gitinspector/gitinspector.py

@@ -184,13 +184,13 @@ def main():
 					filtering.clear()
 				filtering.add(a)
 
-	except (format.InvalidFormatError, optval.InvalidOptionArgument, getopt.error) as exception:
+		__check_python_version__()
+		__run__.output()
+
+	except (filtering.InvalidRegExpError, format.InvalidFormatError, optval.InvalidOptionArgument, getopt.error) as exception:
 		print(sys.argv[0], "\b:", exception.msg)
 		print(_("Try `{0} --help' for more information.").format(sys.argv[0]))
 		sys.exit(2)
 
-	__check_python_version__()
-	__run__.output()
-
 if __name__ == "__main__":
 	main()