# haskell-template

Get a Haskell development environment up and running quickly. Thanks to Nix, this template is optimized for a fully reproducible and friendly development environment. It is based on:

- [Nix](https://srid.ca/haskell-nix) + [Flakes](https://serokell.io/blog/practical-nix-flakes) (via [`github:srid/haskell-flake`](https://github.com/srid/haskell-flake)) + GHC 9.2
- VSCode + [HLS](https://github.com/haskell/haskell-language-server)
- [fourmolu](https://github.com/fourmolu/fourmolu) autoformatting 
- [Relude](https://github.com/kowainik/relude#relude) as Prelude.
  - `.hlint.yaml` is [from relude](https://github.com/kowainik/relude/blob/main/.hlint.yaml)
- Devshell scripts (`,` prefixed) are provided via [mission-control](https://github.com/Platonic-Systems/mission-control)

If you have an *existing* Haskell project, you should probably use https://github.com/srid/haskell-flake instead.

## Getting Started

*tldr: Install Nix, enable Flakes, open in VSCode and run `, run`.*

Full instructions: https://srid.ca/haskell-template/start

Recommended dev environment setup: https://haskell.flake.page/direnv

## Tips

- Run `nix flake update` to update all flake inputs.
- Run `nix build .#check -L` to run the flake checks.
- Run `, fmt` in nix shell to autoformat the project. This uses [treefmt](https://github.com/numtide/treefmt).
- Run `, docs` to start Hoogle with packages in your cabal file.
- Run the application without installing: `nix run github:srid/haskell-template` (or `nix run .` from checkout)
- Common workflows
  - Adding library dependencies in Nix: https://haskell.flake.page/dependency
  - Adding tests: https://srid.ca/haskell-template/tests

## Discussions

Questions? Ideas? Suggestions? You may post them here: https://github.com/srid/haskell-template/discussions