Add displayselect from Luke Smith's dotfiles

nix/pkgs/displayselect/default.nix

@@ -0,0 +1,31 @@
+{ pkgs, ... }:
+
+with pkgs;
+
+stdenv.mkDerivation {
+  pname = "displayselect";
+  version = "0.1.0";
+
+  src = fetchFromGitHub {
+    owner = "lukesmithxyz";
+    repo = "voidrice";
+    rev = "master";
+    sha256 = "BybEijy1zH+UNyCgWnenmcazwE8B3PXGc+Cl0FO/n3o=";
+  };
+
+  buildInputs = [
+    bash
+    bc
+    xorg.xrandr
+  ];
+
+  patches = [
+    ./remove-setbg.patch
+  ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp .local/bin/displayselect $out/bin
+    chmod +x $out/bin/displayselect
+  '';
+}