iced-template: generalize desktopItem linking

these are mostly useful for crane,
and were only acting as unnecessary complexity here

flake.lock

@@ -1,20 +1,5 @@
 {
   "nodes": {
-    "crane": {
-      "locked": {
-        "lastModified": 1785782307,
-        "narHash": "sha256-MPaRdVkf6zZP5fCPxYCi8Dr4pZzgmXzg8T9nVEbp3Mw=",
-        "owner": "ipetkov",
-        "repo": "crane",
-        "rev": "2c71e194474d13de031d729b729c968ddbe3507f",
-        "type": "github"
-      },
-      "original": {
-        "owner": "ipetkov",
-        "repo": "crane",
-        "type": "github"
-      }
-    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -35,23 +20,19 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1785747939,
-        "narHash": "sha256-D740uKsMbgsfK2oaDenJLLPIZfq7W0/g4KN/Fls8eKs=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "104240a772428cc2e20d8fd86c9ddbb886bbaff2",
-        "type": "github"
+        "lastModified": 1786862985,
+        "narHash": "sha256-kSR/jfpR4cE26YRZ8exQkoRbEA30vyWimajwZANYYaE=",
+        "rev": "e5bdc4a41d4c072fe1e3787eaa0320a384741d44",
+        "type": "tarball",
+        "url": "https://releases.nixos.org/nixos/unstable/nixos-26.11pre1055335.e5bdc4a41d4c/nixexprs.tar.zst?lastModified=1786862985&rev=e5bdc4a41d4c072fe1e3787eaa0320a384741d44"
       },
       "original": {
-        "owner": "nixos",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://channels.nixos.org/nixos-unstable/nixexprs.tar.zst"
       }
     },
     "root": {
       "inputs": {
-        "crane": "crane",
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }

flake.nix

@@ -1,8 +1,6 @@
 {
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
-
-    crane.url = "github:ipetkov/crane";
+    nixpkgs.url = "https://channels.nixos.org/nixos-unstable/nixexprs.tar.zst";
 
     flake-utils.url = "github:numtide/flake-utils";
   };
@@ -14,7 +12,6 @@
       let
         pkgs = import inputs.nixpkgs { inherit system; };
         lib = pkgs.lib;
-        craneLib = inputs.crane.mkLib pkgs;
 
         cargoToml = fromTOML (builtins.readFile ./Cargo.toml);
         name = cargoToml.package.name;
@@ -36,75 +33,61 @@
             wayland
           ];
 
-        commonArgs = {
-          # all that's needed for artifacts and checks
-          nativeBuildInputs = with pkgs; [
-            # pkg-config
-          ];
-          buildInputs = with pkgs; [
-          ];
-
-          src = ./.;
-        };
-
-        # Build *just* the cargo dependencies,
-        # to reuse them for build and test derivations.
-        cargoArtifacts = craneLib.buildDepsOnly commonArgs;
-
-        # Build the actual crate itself,
-        # reusing the dependency artifacts from above.
         crate =
           let
             desktopItem = pkgs.makeDesktopItem {
               inherit name;
               desktopName = name;
-              icon = name;
               exec = name;
             };
           in
-          craneLib.buildPackage (
-            commonArgs
-            // {
-              inherit cargoArtifacts;
+          pkgs.rustPlatform.buildRustPackage rec {
+            inherit name;
 
-              nativeBuildInputs = commonArgs.nativeBuildInputs ++ [
-                pkgs.autoPatchelfHook
-              ];
+            src = lib.sourceFilesBySuffices ./. [
+              "Cargo.toml"
+              "Cargo.lock"
+              ".rs"
+            ];
+            cargoLock.lockFile = "${src}/Cargo.lock";
 
-              buildInputs = commonArgs.buildInputs ++ [
-                pkgs.libgcc
-              ];
+            nativeBuildInputs = with pkgs; [
+              autoPatchelfHook
+            ];
+            buildInputs = with pkgs; [
+              libgcc
+            ];
 
-              runtimeDependencies = dlDeps;
+            runtimeDependencies = dlDeps;
 
-              doCheck = false;
+            postFixup = ''
+              cp -rs "${desktopItem}"/* "$out"
+            '';
 
-              postFixup = ''
-                mkdir -p "$out/share/applications"
-                ln -s "${desktopItem}"/share/applications/* "$out/share/applications/"
-              '';
-            }
-          );
+            doCheck = false;
+
+            strictDeps = true;
+            __structuredAttrs = true;
+          };
       in
       {
         packages.default = crate;
 
-        checks = {
-          crate-clippy = craneLib.cargoClippy (
-            commonArgs
-            // {
-              inherit cargoArtifacts;
-
-              cargoClippyExtraArgs = "-- --deny warnings";
-            }
-          );
-        };
-
-        devShells.default = craneLib.devShell {
-          LD_LIBRARY_PATH = lib.makeLibraryPath dlDeps;
+        devShells.default = pkgs.mkShell {
+          env.LD_LIBRARY_PATH = lib.makeLibraryPath dlDeps;
 
           inputsFrom = [ crate ];
-          packages = [ pkgs.rust-analyzer ];
+
+          packages = with pkgs; [
+            rustc
+            cargo
+            clippy
+            rustfmt
+            rust-analyzer
+          ];
+
+          strictDeps = true;
+          __structuredAttrs = true;
         };
       }
     );

src/app/mod.rs

@@ -1,4 +1,6 @@
-use iced::{Color, Element, Renderer, Task, Theme, application, theme, widget};
+use iced::{Color, Task, application, theme, widget};
+
+type Element<'a> = iced::Element<'a, Message, iced::Theme, iced::Renderer>;
 
 enum Message {}
 
@@ -11,12 +13,12 @@ impl State {
     fn update(&mut self, message: Message) -> Task<Message> {
         Task::none()
     }
-    fn view(&self) -> Element<'_, Message, Theme, Renderer> {
+    fn view(&self) -> Element<'_> {
         widget::text("hiiiiiii").into()
     }
 }
 
-pub fn run() -> Result<(), impl std::error::Error> {
+pub fn run() -> Result<(), iced::Error> {
     application(State::new, State::update, State::view)
         .theme(theme::Theme::custom(
             "high-contrast-dark",