What is a spreadsheet? It’s a bunch of nodes tied with dependencies. Some of the nodes are pure data, others are code. It’s a DAG. And you know who has wrote library that processes DAGs as tasks? This guy! it’s called Croupier. So, some cells are just a value with a key: Sheet1!A1 => 42 Other cel…

Why the hell not. Huge props to @omarluq and his termisu shard. [asciicast]

[image] ralsina: What is a spreadsheet? It’s a bunch of nodes tied with dependencies. Some of the nodes are pure data, others are code. It’s a DAG Wow why did I not know that a spreadsheet is a DAG! In retrospect after reading your breakdown it makes lots of sense but I guess I never thought…

Actually they cheat because they use position to break loops. If A1 -> A2 -> A1 They are not going to loop, they stop at loops :-)

Ha, that’s such a pragmatic way to tiebreaker and move on. Side note: great distro choice with EndeavourOS :eyes: :fire:

Ok, it now supports editing cells (no recompilation) and formulas (automatic recompilation) mouse click, double click, and wheel events, and so on (ui branch). TBH it’s a state of the art spreadsheet for 1984 I am shocked this went this well in … about 6 hours of work?

For the spreadsheet lovers, may I recommend some resources? They have been a game changer for me Build systems a la carte: theory and practice - Simon Peyton Jones https://www.microsoft.com/en-us/research/wp-content/uploads/2016/07/excel.pdf LAMBDA: The ultimate Excel worksheet function - Microsof…

Spicy! [image] I feel super identified, having built a build system and … 1 2 3 4 … a few toy spreadsheets :-D

This can now read .xlsx files and I need to stop wasting time in a toy spreadsheet :-D

https://sheety.ralsina.me/ and I am not touching this ever again unless I am bored

Today in prototypes that worked too well: Sheety!

Community

ralsina February 26, 2026, 3:42pm 16

One accidental feature is that if you only have the “spreadhseet binary” but not sheety itself, you can’t edit formulas, only data, so it works as … a modeling tool?

Topic		Replies	Views
Croupier, a tasks / dataflow library News release	12	562	February 27, 2026
My 2022 Crystal Wishlist Community	19	3048	March 11, 2022
A blog post about using Google Sheets API with Crystal Learning Resources blog	0	201	June 13, 2025
Incremental compilation exploration Crystal Contrib	115	7419	October 13, 2025
I went crazy and tried to do some hard stuff because I'm an adult and can just do things	7	212	February 19, 2026

Today in prototypes that worked too well: Sheety!

Related topics