gistfile1.py

# Extended formatter

class Fmt(string.Formatter):
    def __init__(self, builddir, sourcedir, cachedir):
        self.bd = builddir
        self.sd = sourcedir
        self.cd = cachedir
    def get_field(self, name, args, kwargs):
        if len(name) > 1 and ( name[0] == '"' or name[0] == "'" ):
            return (name[1:-1], name)
        else:
            return super().get_field(name, args, kwargs)
    def convert_field(self, value, conversion):
        if conversion == 'B':
            base = self.bd
        elif conversion == 'S':
            base = self.sd
        elif conversion == 'C':
            base = self.cd
        else:
            return super().convert_field(value, conversion)
        if isinstance(value, str):
            return os.path.join(base, value)
        else:
            return os.path.join(base, *value)