gistfile1.py

    def update(self, signal=True):
        for name, values in self.metadata.rawitems():
            if not name.startswith('~') and self.supports_tag(name):
                if self.orig_metadata.getall(name) != values:
                    #print name, values, self.orig_metadata.getall(name)
                    self.similarity = self.orig_metadata.compare(self.metadata)
                    if self.state in (File.CHANGED, File.NORMAL):
                        self.state = File.CHANGED
                    break
        else:
            self.similarity = 1.0
            if self.state in (File.CHANGED, File.NORMAL):
                self.state = File.NORMAL
                
        if hasattr(self.parent, "album"):
            new_filename = self._make_filename(self.filename, self.metadata, self.tagger.config.setting)
            self.log.debug("Metadata: %r", self.metadata)
            self.log.debug("Old filename: %r", self.filename)
            self.log.debug("New filename: %r", new_filename)
            if new_filename != self.filename:
                self.state = File.CHANGED
                self.log.debug("File will be marked as changed!")

        if signal:
            self.log.debug("Updating file %r", self)
            self.parent.update_file(self)