My version of the Piet programming language. Made in collaboration with Jordan during the first half of the W1'24 batch at the Recurse Center.
(Piet Mondrian was a Dutch artist. According to Google Translate, "gratie" is Dutch for "grace"!)
I designed Gratie to be a minimalist version of Piet while retaining its esoteric-ness. The main components of the interpreter are the parser (parses the text-based input program), grid (stores the parsed input as a grid of Colors), and stack (stores the values of the program). We put all the pieces together with the program execution logic in interpreter.rs.
To write your own Gratie program:
- Specify pixel colors in a comma-separated text file. These are the colors:
| Hue change steps | Command |
|---|---|
| 1 | add |
| 2 | multiply |
| 3 | pop |
| 4 | in(char) |
| 5 | out(number) |
| 6 | duplicate |
| 7 | out(char) |
| 8 | in(number) |
| 9 | push |
| 10 | divide |
| 11 | subtract |
- Run
cargo build && ./target/debug/gratie -d PATH/TO/YOUR_PROGRAM.txtto run the repl. Currently, the available commands arestep(execute one command) andrun(run entire program and print result).
Push 3 onto the stack
Print 7 to the console
- Visual video explanation of what's going on with the "direction pointer" and "codel chooser"
- User-friendly in-browser Piet IDE done by a former Recurser and another one
- Examples for implementing control flow in Piet
Gratie is licensed under the MIT License Copyright (c) 2025.
See the LICENSE for information on the history of this software, terms & conditions for usage, and a DISCLAIMER OF ALL WARRANTIES.
All trademarks referenced herein are property of their respective holders.