Filtering rules can now be separated by a comma.

Instead of specifying -x (or --exclude) multiple times, it is possible to
specify multiple filtering rules by separating each rule with a comma (,)
character. This enables the new support for filtering authors and email to
work in conjunction with git-config.

As a side effect, this means that we reserve the comma character for
internal use in gitinspector and that it can't be used in any regular
expression or filtering rule. However, this is not a big problem.

Of course, specifying -x multiple times (like before) is still supported.

gitinspector/filtering.py

@@ -35,7 +35,7 @@ class InvalidRegExpError(ValueError):
 def get():
 	return __filters__
 
-def add(string):
+def __add_one__(string):
 	global __filters__
 	for i in __filters__:
 		if (i + ":").lower() == string[0:len(i) + 1].lower():
@@ -43,6 +43,11 @@ def add(string):
 			return
 	__filters__["file"][0].append(string)
 
+def add(string):
+	rules = string.split(",")
+	for rule in rules:
+		__add_one__(rule)
+
 def clear():
 	global __filters__
 	for i in __filters__: