This is a simple Haskell implementation of Gary Bernhardt's selecta. I wrote it primarily as an exercise in Haskell, and the selecta use case has some properties that make it interesting as such:
- It does some pure text manipulation and mathematical calculation, exercising core Haskell language features.
- It does I/O, and more than simply reading
stdinor files. It accepts input interactively and dynamically updates output in one position in a terminal. - As a result of the above, it requires good data structures for maintaining an internal view of, e.g., current inputs and scroll state so they can be manipulated and displayed correctly.
In addition, it was a good exercise for learning Haskell tooling, such as that for testing and building.