devshell/flake.nix

{
  description = "A collection of handy dev-shells";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs = {
        nixpkgs.follows = "nixpkgs";
        flake-utils.follows = "flake-utils";
      };
    };
  };

  outputs = { self, nixpkgs, flake-utils, rust-overlay }: flake-utils.lib.eachDefaultSystem (system:
    let
      pkgs = import nixpkgs {
        inherit system;
        overlays = [ rust-overlay.overlays.default ];
      };
    in
    {
      devShells = {
        go = import ./shells/go.nix { inherit pkgs; };
        haskell = import ./shells/haskell.nix { inherit pkgs; };
        python = import ./shells/python.nix { inherit pkgs; };
        rust = import ./shells/rust.nix { inherit pkgs; };
      };
    }
  );
}