Add flake.nix

Author: ochsnerd

.envrc

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+use flake

.gitignore

@@ -1,2 +1,3 @@
 /target
 /input/*
+.direnv/

flake.lock

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+{
+  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.${system};
+        # Read the file relative to the flake's root
+        overrides = (builtins.fromTOML (builtins.readFile (self + "/rust-toolchain.toml")));
+        libPath = with pkgs; lib.makeLibraryPath [
+          # load external libraries that you need in your rust project here
+        ];
+      in
+        {
+          devShells.default = pkgs.mkShell rec {
+            nativeBuildInputs = [ pkgs.pkg-config ];
+            buildInputs = with pkgs; [
+              clang
+              llvmPackages.bintools
+              rustup
+            ];
+
+            RUSTC_VERSION = overrides.toolchain.channel;
+            
+            # https://github.com/rust-lang/rust-bindgen#environment-variables
+            LIBCLANG_PATH = pkgs.lib.makeLibraryPath [ pkgs.llvmPackages_latest.libclang.lib ];
+            
+            shellHook = ''
+              export PATH=$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

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+[toolchain]
+channel = "nightly-2025-05-03"
+components = ["rustc", "cargo", "rust-analyzer", "rustfmt", "clippy"]