Add nix flake (#30)

* an attempt

* fix build

Author: catornot

.gitignore

@@ -353,4 +353,7 @@ MigrationBackup/
 /target
 
 # vscode
-/.vscode
+/.vscode
+
+# nix
+/result

flake.lock

@@ -0,0 +1,88 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-24.11";
+    utils.url = "github:numtide/flake-utils";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+  outputs =
+    {
+      self,
+      nixpkgs,
+      utils,
+      rust-overlay,
+    }:
+    utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ (import rust-overlay) ];
+          crossSystem = {
+            config = "x86_64-w64-mingw32";
+            libc = "msvcrt";
+          };
+          config.allowUnsupportedSystem = true;
+        };
+
+        toolchain = (pkgs.pkgsBuildHost.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml);
+      in
+      {
+        formatter = (import nixpkgs { inherit system; }).nixfmt-rfc-style;
+
+        packages = {
+          discordrpc =
+            pkgs.callPackage
+              (
+                {
+                  lib,
+                  rustPlatform,
+                  rust-bin,
+                }:
+                rustPlatform.buildRustPackage (final: {
+                  name = "DiscordRPC";
+                  version = "13.0.0";
+
+                  rustToolchain = rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+                  nativeBuildInputs = [
+                    (rust-bin.fromRustupToolchainFile ./rust-toolchain.toml)
+                  ];
+
+                  src = ./.;
+
+                  meta = {
+                    description = "discord rpc impl for northstar";
+                    homepage = "https://github.com/R2Northstar/NorthstarDiscordRPC";
+                    license = lib.licenses.unlicense;
+                    maintainers = [ "cat_or_not" ];
+                  };
+
+                  cargoLock = {
+                    lockFile = ./Cargo.lock;
+                  };
+                })
+              )
+              {
+                rust-bin = rust-overlay.lib.mkRustBin { } pkgs.buildPackages;
+              };
+
+          default = self.packages.${system}.discordrpc;
+        };
+
+        devShell = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            windows.mingw_w64_headers
+            # windows.mcfgthreads
+            windows.pthreads
+            toolchain
+          ];
+
+          nativeBuildInputs = [
+            toolchain
+          ];
+        };
+      }
+    );
+}

flake.nix

@@ -0,0 +1,4 @@
+[toolchain]
+channel = "stable"
+components = [ "rustfmt", "rust-analyzer", "clippy", "rust-src", "rust-std", "rust-docs", "rustc" ]
+targets = [ "x86_64-pc-windows-gnu" ]