cumber / intero-nix-shim

Intero Haskell IDE with Nix instead of Stack

intero-nix-shim

High-level view

You need to have default.nix and shell.nix defined for your project, see https://nixos.org/nixpkgs/manual/#how-to-create-nix-builds-for-your-own-private-haskell-packages.

Emacs’ intero-stack-executable variable needs to point to /nix/store/…-intero-nix-shim-…/bin/intero-nix-shim.

You can set it to just "intero-nix-shim", if it’s available in your global PATH. (By default, that variable is set to "stack".)

Simple how to

There are several ways to achieve the above.

Probably, the simplest one would be to install intero-nix-shim globally in your PATH, e.g., if you’re on nixos-17.03:

# /etc/nixos/configuration.nix

{
  environment.systemPackages = [
    haskellPackages.intero-nix-shim
  ];
}

… and set intero-stack-executable to just "intero-nix-shim" in .dir-locals.el for your project:

;; your-project/.dir-locals.el

((nil . ((intero-stack-executable . "intero-nix-shim"))))

Warning: if you choose the .dir-locals.el way, Emacs has a security mechanism to prevent untrusted code execution. You will have to accept this setting. If you use global-intero-mode, Intero will start loading before you manage to whitelist this setting. Therefore, the first time, it will fail. Just do M-x intero-restart.