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Showing content from https://github.com/justinwoo/easy-purescript-nix below:

justinwoo/easy-purescript-nix: Easy PureScript (and other tools) with Nix

A project for using PureScript and related tooling easily with Nix. Note that the purescript derivation used in nixpkgs is a derivative of the derivation from this project. See default.nix for more information on available versions.

See ci.nix in this repo for a Nix expression example to be used with nix-shell.

Or simply clone this repo, cd into it, and type nix-shell (which implicitly calls shell.nix).

I have written about how to use parts of Nix here: https://github.com/justinwoo/nix-shorts

Behold:

$ nix-env -f default.nix -iA purs
  # or nix-env -if purs.nix

$ which purs
/home/justin/.nix-profile/bin/purs
$ purs --version
0.14.4

Or by shell.nix:

{ pkgs ? import <nixpkgs> { } }:
let
  easy-ps = import
    (pkgs.fetchFromGitHub {
      owner = "justinwoo";
      repo = "easy-purescript-nix";
      rev = "5716cd791c999b3246b4fe173276b42c50afdd8d";
      sha256 = "1r9lx4xhr42znmwb2x2pzah920klbjbjcivp2f0pnka7djvd2adq";
    }) {
    inherit pkgs;
  };
in
pkgs.mkShell {
  buildInputs = [
    easy-ps.purs-0_14_4
    easy-ps.psc-package
  ];
}

There is a flake.nix. To see what the flake.nix provides,

nix flake show github:justinwoo/easy-purescript-nix

You might need the flag --allow-import-from-derivation if you’re on an older version of Nix.

To get a deluxe PureScript development shell which includes the latest versions of everything,

nix develop github:justinwoo/easy-purescript-nix#deluxe

Create a custom nix develop shell with a flake.nix like this for example:

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
    flake-utils.url = "github:numtide/flake-utils";
    easy-purescript-nix.url = "github:justinwoo/easy-purescript-nix";
  };

  outputs = { nixpkgs, flake-utils, easy-purescript-nix, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        easy-ps = easy-purescript-nix.packages.${system};
      in
      {
        devShells = {
          default = pkgs.mkShell {
            name = "purescript-custom-shell";
            buildInputs = [
              easy-ps.purs-0_15_8
              easy-ps.spago
              easy-ps.purescript-language-server
              easy-ps.purs-tidy
              pkgs.nodejs-18_x
              pkgs.esbuild
            ];
            shellHook = ''
              source <(spago --bash-completion-script `which spago`)
              source <(node --completion-bash)
              '';
          };
       };
     }
  );
}

See the blog post about this here: https://github.com/justinwoo/my-blog-posts/blob/master/posts/2018-10-24-using-purescript-easily-with-nix.md

Raison d'etre: https://github.com/justinwoo/my-blog-posts/blob/master/posts/2019-04-29-why-easy-purescript-nix.md

Thanks to Pekka (@kaitanie) for making this work on NixOS.

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