Fixed a long-standing bug with exceptions not being able to handle unicode.

This was fixed by storing the exception string manually inside each
exception class. The error message is now stored in exception.msg instead
of relying on __str__(). It seems the normal behavior (by printing exceptions
directly) is broken in Python 2. It *does* work in Python 3, but this is
because it always handles everything as unicode.

gitinspector/format.py

@@ -32,7 +32,11 @@ DEFAULT_FORMAT = __available_formats__[2]
 __selected_format__ = DEFAULT_FORMAT
 
 class InvalidFormatError(Exception):
-	pass
+	def __init__(self, msg):
+		self.msg = msg
+
+	def msg():
+		return self.msg
 
 def select(format):
 	global __selected_format__

gitinspector/gitinspector.py

@@ -178,8 +178,8 @@ def main():
 			elif o in("-x", "--exclude"):
 				filtering.add(a)
 
-	except (format.InvalidFormatError, optval.InvalidOptionArgument, getopt.error) as msg:
-		print(sys.argv[0], "\b:", msg)
+	except (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)
 

gitinspector/optval.py

@@ -20,7 +20,11 @@ from __future__ import unicode_literals
 import getopt
 
 class InvalidOptionArgument(Exception):
-	pass
+	def __init__(self, msg):
+		self.msg = msg
+
+	def msg():
+		return self.msg
 
 def __find_arg_in_options__(arg, options):
 	for opt in options: