flake.nix

{
  description = "Raw Rust FFI bindings to util-linux/libmount";

  inputs = {
    # Nixpkgs / NixOS version to use.
    nixpkgs.url = "nixpkgs/nixos-23.11";

    # Set of functions to make flake nix packages simpler to set up without
    # external dependencies.
    utils.url = "github:numtide/flake-utils";

    # Nix library for building Rust projects
    naersk.url = "github:nix-community/naersk/master";

    # Backward compatibility for people without flakes enabled.
    # https://github.com/edolstra/flake-compat
    flake-compat.url = "https://flakehub.com/f/edolstra/flake-compat/1.tar.gz";
  };

  outputs = { self, nixpkgs, utils, naersk, flake-compat }:
    utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
        naersk-lib = pkgs.callPackage naersk { };
      in rec
      {
        packages.default = naersk-lib.buildPackage ./.;

        # Development environment
        devShells.default = with pkgs; mkShell {
          buildInputs = [
            # For Markdown
            glow
            pandoc
            lynx
            w3m

            # For Rust
            cargo
            cargo-audit
            cargo-flamegraph
            cargo-modules
            cargo-nextest
            cargo-vet
            cargo-valgrind
            cargo-workspaces
            lldb
            pkg-config
            rustc
            rust-analyzer
            rustfmt
            rustPackages.clippy

            # For code linting and formatting
            nodejs_20
            marksman
            pre-commit
            ruby
            shellcheck
            shfmt

            # Required by `bindgen`
            clang
            libclang.lib
            # `libmount` source files
            util-linux.dev
          ];

          # Rust source path
          RUST_SRC_PATH = rustPlatform.rustLibSrc;

          # Required by `bindgen`
          LIBCLANG_PATH = pkgs.lib.makeLibraryPath [ pkgs.libclang ];

          # Required by `pkg-config` to discover the locations of `libmount`
          PKG_CONFIG_PATH = "${pkgs.util-linux.dev}/lib/pkgconfig";

          # Inspired by: "C header includes in NixOS"
          # https://discourse.nixos.org/t/c-header-includes-in-nixos/17410
          # Solves the root cause of error messages emitted when trying to
          # compile rsmount-sys from inside a VM.
          # --- stderr
          # src/wrapper.h:1:10: fatal error: 'libmount/libmount.h' file not found
          C_INCLUDE_PATH="${pkgs.util-linux.dev}/include";
        };

      });
}