IHaskell.Display.Widgets not available when using Nix packages

[aneilmac]

Hi there,

AFAIK, there is currently no way to access widgets functionality when using a Nix workflow.

Currently I have a repl.it setup like so:

{ pkgs }:
let
  ihaskell =
    pkgs.ihaskell.override { packages = (hpkgs: [ hpkgs.ihaskell-widgets ]); };
in { deps = [ ihaskell ]; }

But as the widgets library on hackage is outdated this project will not build.

If possible, could you please update the ihaskell-widgets package on hackage/nixos.org such that widgets can be used in a nix workflow? (Or alternatively, a display: true flag that can be enabled to activate all the bells and whistles?)

Thanks for all your hard work on this.

[vaibhavsagar]

You can use the .nix files in this repo to set that up using something like this:

let
  nixpkgs = builtins.fetchTarball {
    url = "https://github.com/NixOS/nixpkgs/tarball/${rev}";
    sha256 = "0a0dnbsbblh4wps0lzzxv3gfphscv6bqjc77lkr58xkzcijjdlv2";
  };
  ihaskell = builtins.fetchTarball {
    url = "https://github.com/IHaskell/IHaskell/tarball/${rev}";
    sha256 = "1k4ljp7fnrswq055lqjz25c45gi1nkxrs4mh4fx0wv6lxi0i6zxa";
  };
in import "${ihaskell}/release.nix" {
  compiler = "ghc928";
  nixpkgs  = import nixpkgs {};
  packages = self: with self; [ ihaskell-widgets ];
}

[vaibhavsagar]

I've uploaded [ihaskell-widgets-0.4.0.0](https://hackage.haskell.org/package/ihaskell-widgets-0.4.0.0). Getting it updated on Stackage and Nixpkgs is a separate matter, but since you can use the approach above or pull it directly from Hackage, I think I can close this. Please reopen if required.

[aneilmac]

Sorry for the delay - the change has made its way over into repl now, and I just wanted to say thank you very much, it works like a charm now.