This project builds a Doom WAD that implements an adding machine! It is written in Clojure.

I go into depth in my blog post: https://blog.otterstack.com/posts/202212-doom-calculator/

You need to install Leiningen, a project build tool for Clojure. Instructions are on the site: https://leiningen.org/

You will also need to install Java to use Clojure. If it's not already installed, one way to obtain Java is to install OpenJDK 11 or 17 from Adoptium: https://adoptium.net/

Once everything is installed, run the following in your shell:

lein run

The above will execute the -main function in src/doomcalc/core.clj, which will create out.wad.

Note that the map is missing BSP node and segment information, so it won't run in Vanilla Doom out of the box. If you would like to build this extra information, I recommend using a map editor such as SLADE and re-saving the level.

There are many ways to use the Clojure REPL. The lowest learning-curve IMO is to use Leiningen. In your shell:

lein repl

This will give you immediate access to an interactive REPL environment where you can run Clojure code.

If you'd like to use an IDE, I use the VS Code plugin "Calva". Outside of VS Code, CIDER is good if you're an Emacs user. In this section, I will focus on Calva.

You can install Calva by searching for it in the VS Code extensions section.

Follow the steps here to connect to a Clojure project: https://calva.io/connect/