add: desktop entry, metadata, app name, icons

flake.nix

@@ -3,7 +3,8 @@
 
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
 
-  outputs = { self, nixpkgs }:
+  outputs =
+    { self, nixpkgs }:
     let
       supportedSystems = [
         "x86_64-linux"
@@ -12,7 +13,16 @@
       forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
     in
     {
-      packages = forAllSystems (system:
+      formatter = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+        in
+        pkgs.nixfmt-rfc-style
+      );
+
+      packages = forAllSystems (
+        system:
         let
           pkgs = nixpkgs.legacyPackages.${system};
         in
@@ -23,7 +33,8 @@
 
             src = pkgs.lib.cleanSourceWith {
               src = ./.;
-              filter = path: type:
+              filter =
+                path: type:
                 let
                   name = baseNameOf path;
                 in
@@ -47,6 +58,20 @@
               gtk4
             ];
 
+            postInstall = ''
+              install -Dm444 \
+                data/com.wyattjmiller.snespatcher.desktop \
+                $out/share/applications/com.wyattjmiller.snespatcher.desktop
+
+              install -Dm444 \
+                data/com.wyattjmiller.snespatcher.metainfo.xml \
+                $out/share/metainfo/com.wyattjmiller.snespatcher.metainfo.xml
+
+              install -Dm444 \
+                data/icons/hicolor/scalable/apps/com.wyattjmiller.snespatcher.svg \
+                $out/share/icons/hicolor/scalable/apps/com.wyattjmiller.snespatcher.svg
+            '';
+
             meta = {
               description = "GTK 4 application for applying IPS patches to SNES ROMs";
               homepage = "https://scm.wyattjmiller.com/wymiller/snespatcher";
@@ -57,9 +82,11 @@
           };
 
           default = snespatcher;
-        });
+        }
+      );
 
-      devShells = forAllSystems (system:
+      devShells = forAllSystems (
+        system:
         let
           pkgs = nixpkgs.legacyPackages.${system};
         in
@@ -72,8 +99,11 @@
               clippy
               rustc
               rustfmt
+              desktop-file-utils
+              appstream
             ];
           };
-        });
+        }
+      );
     };
 }