Hello all, I've been experimenting with generating graphs from log files using timeplot and serving them with yesod. Each generated graph is only served once, so I need a way to clean them up. A cron job would be ok, but it's one more thing I'd have to remember to do, and I'm lazy. Instead, I'd like to pass a "clean up action" to the enumerator sending the file, to be performed after EOF is reached. For most files, this would just close the handle. For temp files, it would also delete the file. Here's the gist of it: http://gist.github.com/640902 The first revision defines a monolithic fromTempFile :: FilePath -> Enumerator. The second imports a factored version from Network.Wai.Handler (see my wai commit: http://github.com/softmechanics/wai/commit/2cb5ea47ca458f4b91a73e01a1dd0a29e...). Not sure wai is the place for it. Perhaps wai-extra would be a better? Does this seem like a good approach? Regards, -matt