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haskell-template

Haskell project template optimized for a fully reproducible and friendly development environment. Based on:

Getting Started

First-time setup:

  • Install Nix (>= 2.8) & enable Flakes
  • Run nix develop -c haskell-language-server to sanity check your environment
  • Open as single-folder workspace in Visual Studio Code
    • When prompted by VSCode, install the workspace recommended extensions
    • Ctrl+Shift+P to run command "Nix-Env: Select Environment" and then select shell.nix.
      • The extension will ask you to reload VSCode at the end. Do it.

To run the program with auto-recompile:

  • Press Ctrl+Shift+B in VSCode, or run bin/run in terminal, to launch Ghcid running your program.

Open Main.hs, and expect all HLS IDE features like hover-over tooltip to work out of the box. Try changing the source, and expect Ghcid to re-compile and re-run the app in the terminal below.

Renaming the project:

# First, click the green "Use this template" button on GitHub to create your copy.
git clone <your-clone-url>
cd your-project
NAME=myproject

git mv haskell-template.cabal ${NAME}.cabal
nix run nixpkgs#sd -- haskell-template ${NAME} * */*
git add . && git commit -m rename

Tips

  • Run nix flake update to update all flake inputs.
  • Run treefmt in nix shell to autoformat the project. This uses treefmt, which uses ./treefmt.toml (where fourmolu and nixpkgs-fmt are specified).
  • Run bin/hoogle 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)

Alternatives