Scheme developer retools data layer with hygienic macros to revive Repository Pattern

What happened

It has been reported that a Scheme developer has published a new take on the Repository Pattern, using hygienic macros to decouple controllers from SQLite-backed storage. Coming from a background in Scala, Java and functional languages like Haskell and Rust, the author says they kept bumping into the same anti-pattern: controllers tightly coupled to database code. Frustrated? Absolutely. So they built a small eDSL with macros and pushed an example repo (lucidplan) and plans to integrate it into byggsteg.

How it works

The approach centers on two macros. define-record-with-kw creates ergonomic keyword-argument constructors so you don’t dance around positional parameters. define-repo-method is described as the real superpower: it allegedly accepts any arity plus optional and #:keyword arguments, letting you declare repository methods cleanly and concisely. The SQLite implementation — using Artanis — lives separately, so the business logic speaks the repo-language without knowing how data is persisted.

Why it matters

This is a tidy mix of old Lisp magic and modern FP concerns: hygienic macros give you safe, composable metaprogramming, while the repo abstraction buys you easier testing and clearer boundaries. It’s part of a broader trend — people are rediscovering macros to build domain-specific languages that are both expressive and maintainable. Could this pattern be a small antidote to “glue logic” creeping into controllers? Quite possibly.

Community angle

The author asked for feedback and open criticism. It’s early days — it has been reported that they’re still iterating — but the idea is worth watching if you care about clean architecture in dynamic languages. Questions remain: ergonomics at scale, debugging macro-generated code, and how this pattern plays with migrations and complex queries. Want to poke at the code? The lucidplan repo is linked in the write-up.

Sources: jointhefreeworld.org, Lobsters