flake.nix

{
  description = "Rust devshell for GE-Man-Lib project";
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
  inputs.flake-utils.url = "github:numtide/flake-utils";

  outputs = { nixpkgs, flake-utils, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
      in
      {
        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            clang
            # Replace llvmPackages with llvmPackages_X, where X is the latest LLVM version (at the time of writing, 16)
            llvmPackages.bintools
            rustup
            openssl
            pkg-config
          ];
          RUSTC_VERSION = pkgs.lib.readFile ./rust-toolchain;
          # https://github.com/rust-lang/rust-bindgen#environment-variables
          LIBCLANG_PATH = pkgs.lib.makeLibraryPath [ pkgs.llvmPackages_latest.libclang.lib ];
          shellHook = ''
            export PATH=$PATH:''${CARGO_HOME:-~/.cargo}/bin
            export PATH=$PATH:''${RUSTUP_HOME:-~/.rustup}/toolchains/$RUSTC_VERSION-x86_64-unknown-linux-gnu/bin/
            export BINS='.flake-bins'

            mkdir -p "$BINS"
            ln -sfn ${pkgs.rustup} "$BINS/rustup"
          '';
          # Add precompiled library to rustc search path
          RUSTFLAGS = (builtins.map (a: ''-L ${a}/lib'') [
            # add libraries here (e.g. pkgs.libvmi)
          ]);
          # Add glibc, clang, glib and other headers to bindgen search path
          BINDGEN_EXTRA_CLANG_ARGS =
            # Includes with normal include path
            (builtins.map (a: ''-I"${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/''
            ];
        };
      });
}