Categories / programming

part one: persistent data structures part two: immutable.fnl optimizations part three: parsing part four: parsing (again) Other than that, the parsing is complete, and we can look at the compiler part of the ClojureFnl project. But that’s gonna be in the next post.

Earlier this year I published a guide on how to implement slopes in AABB collision resolution using bump.lua. The resulting system worked, but was a bit hard to use in-game and had a few issues, so I wouldn’t consider it a viable solution.

This year I decided to participate in the Spring Lisp Game Jam. It’s an annual event, where you have to make a game in any kind of lisp in a limited time, usually a week. I’ve been putting this away for several years, because every time the jam started I wasn’t ready to spend time on it, because of work or other duties I had at the time.

part one: persistent data structures part two: immutable.fnl optimizations part three: parsing part four: parsing (again) The two previous posts were not related to the compiler itself, but were kicked off by the start of the compiler development. I’d say this project was the reason that I made proper immutable data structures for Fennel and Lua.

part one: persistent data structures part two: immutable.fnl optimizations part three: parsing part four: parsing (again) So the next post will hopefully be about the compiler itself. Unless I get distracted again. Sike! While I did some work on the compiler, I’m not feeling ready to talk about it yet.

part one: persistent data structures part two: immutable.fnl optimizations part three: parsing part four: parsing (again) Somewhere in 2019 I started a project that aimed to bring some of Clojure features to Lua runtime - fennel-cljlib. It was a library for Fennel that implemented a basic subset of clojure.

Recently (again, bored on a vacation), I started working on a game I’ve planned for a long time. I wasn’t satisfied with my existing implementations of a player controller1, so I started working on a new one. After a bit of fiddling around, I came to something I’m satisfied with, for now, at least, but while working on it, I wanted to add something I haven’t done in any of my projects yet - I decided to add slopes to my game.

Some time ago, I was working on an HTTP library for Fennel. As a proof of concept, I added a module that implements a simple web server and wanted to experiment with it. The server can serve files from a directory using this simple handler:

I’m continuing my work on fennel-cljlib, my port of clojure.core and some other core libraries, focusing on porting missing functions and features to it. One such feature, which I sometimes miss in Lua and Fennel, is dynamic binding. The Lua VM doesn’t provide dynamic scoping as a language feature, and Fennel itself doesn’t introduce any concepts like Clojure’s Var.

If you know Python or do a lot of shell scripting (or even write in Perl), you’re probably familiar with the ability of these languages to reference variables or even expressions from string literals. In a shell, it is possible to do this: