18     def open(self, filename, action=None):  argument
19         assert filename
20         filename = self.canonize(filename)
21         if os.path.isdir(filename):
25                 "%r is a directory." % (filename,),
28         key = os.path.normcase(filename)
35             return action(filename)
37             edit = self.EditorWindow(self, filename, key)
44     def gotofileline(self, filename, lineno=None):  argument
45         edit = self.open(filename)
49     def new(self, filename=None):  argument
50         return self.EditorWindow(self, filename)
78         filename = edit.io.filename
79         if not filename:
84         filename = self.canonize(filename)
85         newkey = os.path.normcase(filename)
93                 "You now have multiple edit windows open for %r" % (filename,),
103     def canonize(self, filename):  argument
104         if not os.path.isabs(filename):
110                 filename = os.path.join(pwd, filename)
111         return os.path.normpath(filename)
122         for filename in sys.argv[1:]:
123             flist.open(filename)