nix: initialise flake with Fyne native dependencies

Fyne has various cgo dependencies, the flake provides their dependencies as well as a build script in a dev shell.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1717179513,
+        "narHash": "sha256-vboIEwIQojofItm2xGCdZCzW96U85l9nDW3ifMuAIdM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "63dacb46bf939521bdc93981b4cbb7ecb58427a0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "24.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,57 @@
+{
+  description = "Fyne build script";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/24.05";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forAllSystems = f: nixpkgs.lib.genAttrs supportedSystems (system: f system);
+    in
+    {
+      devShells = forAllSystems
+        (system:
+          let
+            pkgs = import nixpkgs {
+              inherit system;
+            };
+          in
+          {
+            default = with pkgs; mkShell
+              ({
+                packages = [
+                  clang
+                ] ++ (if stdenv.isLinux then [
+                  (pkgs.writeShellScriptBin "build" ''
+                    go build -v -o /tmp/rpcfetch ./fetch
+                    # wayland support is partially broken at the moment
+                    #go build -v -tags wayland -o /tmp/wl-rpcfetch ./fetch
+                  '')
+                  vulkan-headers
+                  libxkbcommon
+                  wayland
+                  xorg.libX11
+                  xorg.libXcursor
+                  xorg.libXfixes
+                  xorg.libXrandr
+                  xorg.libXinerama
+                  xorg.libXi
+                  xorg.libXxf86vm
+                  glfw-wayland
+                  pkg-config
+                ] else if stdenv.isDarwin then [
+                  darwin.apple_sdk_11_0.frameworks.Foundation
+                  darwin.apple_sdk_11_0.frameworks.Metal
+                  darwin.apple_sdk_11_0.frameworks.QuartzCore
+                  darwin.apple_sdk_11_0.frameworks.AppKit
+                  darwin.apple_sdk_11_0.MacOSX-SDK
+                ] else [ ]);
+              } // (if stdenv.isLinux then {
+                LD_LIBRARY_PATH = "${vulkan-loader}/lib";
+              } else { }));
+          }
+        );
+    };
+}