add flakes

Signed-off-by: Harald Hoyer <harald@hoyer.xyz>

default.nix

@@ -0,0 +1,39 @@
+{ lib, darwin, stdenv, openssl, pkg-config, rustPlatform, }:
+let cargoFile = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package;
+in rustPlatform.buildRustPackage {
+
+  pname = cargoFile.name; # The name of the package
+  version = cargoFile.version; # The version of the package
+
+  # You can use lib here to make a more accurate source
+  # this can be nice to reduce the amount of rebuilds
+  # but thats out of scope for this post
+  src = ./.; # The source of the package
+
+  # The lock file of the package, this can be done in other ways
+  # like cargoHash, we are not doing it in this case because this
+  # is much simpler, especially if we have access to the lock file
+  # in our source tree
+  cargoLock.lockFile = ./Cargo.lock;
+
+  # The runtime dependencies of the package
+  buildInputs = [ openssl ] ++ lib.optionals stdenv.isDarwin
+    (with darwin.apple_sdk.frameworks; [
+      Security
+      CoreFoundation
+      SystemConfiguration
+    ]);
+
+  # programs and libraries used at build-time that, if they are a compiler or
+  # similar tool, produce code to run at run-time—i.e. tools used to build the new derivation
+  nativeBuildInputs = [ pkg-config ];
+
+  cargoLock.outputHashes = {
+    "mcp-core-1.0.7" = "sha256-I2lxsv71i/LLZN3r/7mwNc6nZRd1xtQNVUm/g08nhn0=";
+  };
+
+  meta = {
+    license = lib.licenses.mit;
+    mainProgram = cargoFile.name;
+  };
+}