Nix Demo for Go Project

.envrc

# IMPORTANT: You have to install `direnv`!
#
# To enable direnv, `.bashrc` (or bash_profile? unsure) should have:
#   eval "$(direnv hook bash)"
#
# To enable flake on DirEnv, add to `.config/direnv/lib/use_flake.sh`:
# use_flake() {
#   watch_file flake.nix
#   watch_file flake.lock
#   $(nix print-dev-env --profile "$(direnv_layout_dir)/flake-profile")"
# }
#####################

use flake

default.nix

# This is also for `nix build`
# Sample of packaging a Go application in Nix.
########
{ lib, buildGoPackage }:

buildGoPackage rec {
  pname = "demo1";
  version = "1.0.0";

  subPackages = [ "." ];

  # goPackagePath = "gitlab.com/gitlab-org/gitlab-runner";
  # commonPackagePath = "${goPackagePath}/common";

  ldflags = [
    "-X ${commonPackagePath}.NAME=${pname}"
    "-X ${commonPackagePath}.VERSION=${version}"
    "-X ${commonPackagePath}.REVISION=v${version}"
  ];

  src = ./.;

  # postInstall = ''
  #   install -d $out/bin/helper-images
  # '';

  meta = with lib; {
    description = "A demo";
    license = licenses.mit;
    homepage = "";
    platforms = platforms.unix ++ platforms.darwin;
    maintainers = with maintainers; [ ];
  };
}

flake.nix

# This enables `nix build` + other things.
{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let pkgs = nixpkgs.legacyPackages.${system};
      in rec {
        packages.demo1 = pkgs.callPackage ./default.nix { };
        defaultPackage = packages.demo1;
        devShell = import ./shell.nix { inherit pkgs; };
      });
}

shell.nix

# Enables: `nix-shell`
######

{ pkgs ? import <nixpkgs> { } }:

with pkgs;

mkShell {
  buildInputs = [
    go
    gox
    gotools
    gopls
    go-outline
    gocode
    gopkgs
    gocode-gomod
    godef
    golint
  ];
}