Add fileicon tool

fileicon.nix

@@ -0,0 +1,23 @@
+{ pkgs }:
+let
+    name = "fileicon";
+    version = "v0.3.4";
+    src = pkgs.fetchFromGitHub {
+      owner = "mklement0";
+      repo = name;
+      rev = version;
+      hash = "sha256-AqAnY/neBIkxgB5ioyExO4NSLw0Rk4wTo9hcCHTqOQ8=";
+    };
+in pkgs.stdenv.mkDerivation {
+  inherit src name version;
+
+  dontBuild = true;
+  installPhase = ''
+    cd "$src"
+    mkdir -p "$out/bin" "$out/share/man"
+    cp bin/fileicon "$out/bin/"
+    cp man/fileicon.1 "$out/share/man"
+  '';
+
+  # TODO: Run the test suite?
+}

flake.nix

@@ -63,6 +63,8 @@
       mkNixOsGraphical = opts: import ./nixos/graphical.nix opts;
       mkNixOsNetworking = opts: import ./nixos/networking.nix opts;
     in {
+      packages."aarch64-darwin".fileicon = import ./fileicon.nix { pkgs = mkPkgs "aarch64-darwin"; };
+
       homeConfigurations."xenia@Joe-Bidens-MacBook-Pro" =
         let
           system = "aarch64-darwin";