I'm a big fan of Decline, but I still think that leaving macro-derived CLIs off the table is incorrect – you can get quite far with enums, case classes, and annotations in small to medium apps. In my projects I use both the raw Decline API and my own derivation mechanism for it.

New post!

Self-contained multi-stage Dockerfiles are rad

Post: blog.indoorvivants.com/2025-10-14-s...

Repo: github.com/indoorvivant...

I use this old approach a lot in my apps (fullstack mostly) and I'm confident it's good enough for most people.

To celebrate the release of Cats Effect for Native 0.5, I rebuilt my web interface for sn-bindgen in Smithy4s and Http4s.

Now on Native 0.5, and actually working!

Blog post: blog.indoorvivants.com/2025-09-22-s...

App: sn-bindgen-web.indoorvivants.com

Repo: github.com/indoorvivant...

Got invited to Imperial College of London to do some livecoding for students, this time making a simple Electron app with Scala.js searching Scala libraries.

github.com/keynmol/scal...

For something more relatable, here's a Scaladex MCP server: github.com/keynmol/scal....

Note that the model did not get any project descriptions and decided to just wing it.

I've been playing around with MCP to understand the hype, and wrote a small library (codegen, really): github.com/indoorvivant...

This image itself was generated by my CLI (Scala Native btw!) tools, into which I added a mcp subcommand.

With AST seemingly explorer not maintained, I decided to try and implement it in Scala.js.

Lots of fun, until I hit several recursion bugs in my interval tree implementation, and it was hell from that point onwards.

This will soon be hosted under Scalameta org and website.

Released scala-uri 4.2.0, now with Scala Native 0.5 support: github.com/indoorvivant...

The native part currently depends on libidn2, but I'm working on a pure Scala Punycode implementation, to remove dependency on scalajs-dom (and browser) in Scala.js as well.

Calling Scala Native from Java using Foreign Function & Memory API

blog.indoorvivants.com/2025-02-16-s...

Code:
- example with Scala CLI: github.com/keynmol/scal...
- self-contained SBT template: github.com/keynmol/scal...
- sbt-jextract plugin: github.com/indoorvivant... pic.x.com/VaCkgTVEVm

toml-scala 0.3.0 is out: now with Scala 3 derivation!

github.com/indoorvivant...

New blog post.

Let's call Java/Scala JVM from Scala Native using JNI. Because why not.

blog.indoorvivants.com/2025-02-08-j...

Don't just take my word for it – I added a HLJS comparison mode

Last night I added a bunch of improvements to my Tree Sitter powered Scala syntax highlighter.

Themes, facelift, latest tree-sitter-scala (now with named tuples support!), and a bunch of build niceties.

keynmol.github.io/scala-treesi...

I plan to write a blogpost about how all of this works.

Here's an interactive cue4s demo running in the browser, using xterm.js and Scala.js!

Have a go: keynmol.github.io/cue4s-xterm-...
See how it's built: github.com/keynmol/cue4...

Cue4s 0.0.3 is out, and with this version I was able to port dexsearch to it, removing the javascript prompts dependency entirely!

cue4s: github.com/neandertech/...
dexsearch: github.com/neandertech/...

Quickest I ever deployed anything probably

Mimalyzer: check if a change triggers a MiMa problem

Try it: mimalyzer.fly.dev
Code: github.com/keynmol/mima...
Template: github.com/indoorvivant...

It's built in like 40 minutes, so it will constantly crash, bye :P