shell.nix

with import <nixpkgs> {};
let 
  nixpkgs18_11 = import (fetchFromGitHub {
                   owner="NixOS";
                   repo="nixpkgs";
                   rev="866b1dbedaf84a0cc5721c475ec4196dc76ae906";
                   sha256="1kblflrvb4yqhkz9pdfkb33q4kzvkxf5ggl6b271qs7s2z1hn7j4";
  }) {};


  vsCodeApps = [
        nixpkgs18_11.fsharp
        nixpkgs18_11.mono
  ];
  vscode = 
    #buildVSCode can be found in https://github.com/countoren/nixpkgs/blob/master/config.nix
    buildVSCode {
      additionalPostFixup = ''
        wrapProgram $out/bin/code --prefix PATH : ${lib.makeBinPath vsCodeApps}
      '';
      vscodeMatketExtensions = [
          {
            name = "vim";
            publisher = "vscodevim";
            version = "0.16.9";
            sha256 = "0y12asjx3z3wlpb6vdh7qnl5qkf439rv790pf9wlyigay2ayv73b";
          }
          # FSharp
          {
            name = "ionide-fsharp";
            publisher = "ionide";
            version = "3.30.0";
            sha256 = "0ig9zmbyfmxvjfjnn1f108vpij9q3qzh74b3gwr12kziiy3qmiyi";
          }

        ];
      };
  

in
stdenv.mkDerivation rec {
  name = "fsTest";
  buildInputs = [
    figlet
    nixpkgs18_11.git
    nixpkgs18_11.fsharp
  ] 
  ++ vscode.buildInputs;
  shellHook = ''
    figlet "wellcome to FS test"
  ''
  + vscode.shellHook;
}