17     def open(self, filename, action=None):  argument
18         assert filename
19         filename = self.canonize(filename)
20         if os.path.isdir(filename):
24                 "%r is a directory." % (filename,),
27         key = os.path.normcase(filename)
34             return action(filename)
36             return self.EditorWindow(self, filename, key)
38     def gotofileline(self, filename, lineno=None):  argument
39         edit = self.open(filename)
43     def new(self, filename=None):  argument
44         return self.EditorWindow(self, filename)
72         filename = edit.io.filename
73         if not filename:
78         filename = self.canonize(filename)
79         newkey = os.path.normcase(filename)
87                 "You now have multiple edit windows open for %r" % (filename,),
97     def canonize(self, filename):  argument
98         if not os.path.isabs(filename):
104                 filename = os.path.join(pwd, filename)
105         return os.path.normpath(filename)
116         for filename in sys.argv[1:]:
117             flist.open(filename)