Sula: A Gemini protocol server written in Scryer Prolog
sagredo.dev
August 5, 2026
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Summary
Sula is a Gemini protocol server developed in Scryer Prolog. It requires a patched version of Scryer Prolog that includes a native '$copy_stream'/2 builtin for streaming binary files to TLS clients and a fix to library(pio)’s buffer preparation for lazy reads from process pipes.
Key Takeaways
- Sula is a Gemini protocol server implemented in Scryer Prolog, requiring a patched version of Scryer Prolog to function correctly.
- The server supports TLS via rustls, hostname verification, and content negotiation based on file extensions.
- Sula features graceful shutdown on SIGINT and per-connection error handling for TLS handshake failures and client disconnects.
- Planned features for Sula include client certificates, configuration file support, and multi-threading capabilities.