added nix development environment

added rust-toolchain.toml for the nix flake

The nix flake needs a rust-toolchain.toml to rely on

Author: Guelakais

flake.lock

@@ -0,0 +1,62 @@
+{
+  description = "Rust development environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+  }:
+    flake-utils.lib.eachDefaultSystem (
+      system: let
+        pkgs = nixpkgs.legacyPackages.${system};
+        # Read the file relative to the flake's root
+        overrides = builtins.fromTOML (builtins.readFile (self + "/rust-toolchain.toml"));
+      in {
+        devShells.default = pkgs.mkShell rec {
+          nativeBuildInputs = [pkgs.pkg-config];
+          buildInputs = with pkgs; [
+            clang
+            llvmPackages.bintools
+            rustup
+            wasm-pack
+          ];
+
+          RUSTC_VERSION = overrides.toolchain.channel;
+
+          # https://github.com/rust-lang/rust-bindgen#environment-variables
+          LIBCLANG_PATH = pkgs.lib.makeLibraryPath [pkgs.llvmPackages_latest.libclang.lib];
+
+          shellHook = ''
+            export PATH=$PATH:''${CARGO_HOME:-~/.cargo}/bin
+            export PATH=$PATH:''${RUSTUP_HOME:-~/.rustup}/toolchains/$RUSTC_VERSION-x86_64-unknown-linux-gnu/bin/
+          '';
+
+          # Add precompiled library to rustc search path
+          RUSTFLAGS = builtins.map (a: ''-L ${a}/lib'') [
+            # add libraries here (e.g. pkgs.libvmi)
+          ];
+
+          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath (buildInputs ++ nativeBuildInputs);
+
+          # Add glibc, clang, glib, and other headers to bindgen search path
+          BINDGEN_EXTRA_CLANG_ARGS =
+            # Includes normal include path
+            (builtins.map (a: ''-I"${a}/include"'') [
+              # add dev libraries here (e.g. pkgs.libvmi.dev)
+              pkgs.glibc.dev
+            ])
+            # Includes with special directory paths
+            ++ [
+              ''-I"${pkgs.llvmPackages_latest.libclang.lib}/lib/clang/${pkgs.llvmPackages_latest.libclang.version}/include"''
+              ''-I"${pkgs.glib.dev}/include/glib-2.0"''
+              ''-I${pkgs.glib.out}/lib/glib-2.0/include/''
+            ];
+        };
+      }
+    );
+}

flake.nix

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "nightly"
+