Add shell.nix

Signed-off-by: Dimitris Zervas <dzervas@dzervas.gr>

.vscode/settings.json

@@ -1,4 +1,5 @@
 {
 	"rust-analyzer.cargo.features": "all",
-	"rust-analyzer.check.features": "all"
+	"rust-analyzer.check.features": "all",
+	"nixEnvSelector.nixFile": "${workspaceFolder}/shell.nix"
 }

shell.nix

@@ -0,0 +1,35 @@
+with import <nixpkgs> {};
+mkShell {
+  nativeBuildInputs = [
+    rustup
+    cargo-xwin
+    pkg-config
+    llvmPackages.libclang
+  ];
+
+  # Got from https://discourse.nixos.org/t/setting-up-a-nix-env-that-can-compile-c-libraries/15833
+  shellHook = ''
+    export LIBCLANG_PATH="${llvmPackages.libclang.lib}/lib";
+    export BINDGEN_EXTRA_CLANG_ARGS="$(< ${stdenv.cc}/nix-support/libc-crt1-cflags) \
+      $(< ${stdenv.cc}/nix-support/libc-cflags) \
+      $(< ${stdenv.cc}/nix-support/cc-cflags) \
+      $(< ${stdenv.cc}/nix-support/libcxx-cxxflags) \
+      ${
+        lib.optionalString stdenv.cc.isClang
+        "-idirafter ${stdenv.cc.cc}/lib/clang/${
+          lib.getVersion stdenv.cc.cc
+        }/include"
+      } \
+      ${
+        lib.optionalString stdenv.cc.isGNU
+        "-isystem ${stdenv.cc.cc}/include/c++/${
+          lib.getVersion stdenv.cc.cc
+        } -isystem ${stdenv.cc.cc}/include/c++/${
+          lib.getVersion stdenv.cc.cc
+        }/${stdenv.hostPlatform.config} -idirafter ${stdenv.cc.cc}/lib/gcc/${stdenv.hostPlatform.config}/${
+          lib.getVersion stdenv.cc.cc
+        }/include"
+      } \
+    "
+  '';
+}