I've released BurryFS, a file system based on Fuse and implemented in Chicken Scheme. BurryFS interacts with Fuse (the userspace filesystem API — merged into the Linux kernel since 2.6.14) to organize Digg content as a file system. Since the Fuse API relies on callbacks to deliver file system requests, and Scheme functions cannot serve as C callbacks, I have written a simple inversion-of-control layer that serializes Fuse requests over an internal socket and waits for replies from Scheme. At the other end, Scheme sits in an event loop, unpacking requests, reading information via the Digg API and sending replies. Since Chicken implements cooperative (lightweight) threads, complete with TCP support, BurryFS performance should be high even with multiple parallel requests.

For more information (and downloads), see the BurryFS homepage.