flake.nix

{
  description = "Heroicons";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let pkgs = import nixpkgs { inherit system; };
      in with pkgs; {

        devShell = pkgs.mkShell {
          buildInputs = with pkgs; [ elixir erlang ];
          shellHook = ''
            mkdir -p .nix-mix
            mkdir -p .nix-hex
            export MIX_HOME=$PWD/.nix-mix
            export HEX_HOME=$PWD/.nix-hex
            export PATH=$MIX_HOME/bin:$PATH
            export PATH=$HEX_HOME/bin:$PATH
            export PATH=$MIX_HOME/escripts:$PATH

            export ERL_AFLAGS="-kernel shell_history enabled"
            export ERL_LIBS="" # see https://elixirforum.com/t/compilation-warnings-clause-cannot-match-in-mix-and-otp-tutorial/25114/4

            export PS1="\[\e[1;33m\][dev]\[\e[1;34m\] \w $ \[\e[0m\]"
          '';
        };
      });
}