core/flake.nix

{
  description = "A terminal UI client for the matrix chat protocol";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

    # inputs for following
    flake-compat = {
      url = "github:edolstra/flake-compat";
      flake = false;
    };
    crane = {
      url = "github:ipetkov/crane";
      inputs = {
        nixpkgs.follows = "nixpkgs";
        flake-compat.follows = "flake-compat";
        flake-utils.follows = "flake-utils";
        rust-overlay.follows = "rust-overlay";
      };
    };
    flake-utils = {
      url = "github:numtide/flake-utils";
      inputs = {};
    };
    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs = {
        nixpkgs.follows = "nixpkgs";
        flake-utils.follows = "flake-utils";
      };
    };

    # cranelift
    rustc_cranelift_backend = {
      url = "github:bjorn3/rustc_codegen_cranelift/dev";
      flake = false;
    };
    rustc_cranelift_backend_src = {
      url = "https://github.com/bjorn3/rustc_codegen_cranelift/releases/download/dev/cg_clif-x86_64-unknown-linux-gnu.tar.xz";
      flake = false;
    };
  };

  outputs = {
    self,
    nixpkgs,
    crane,
    flake-utils,
    rust-overlay,
    rustc_cranelift_backend,
    rustc_cranelift_backend_src,
    ...
  }:
    flake-utils.lib.eachDefaultSystem (system: let
        c_rust = pkgs.rust-bin.fromRustupToolchainFile "${rustc_cranelift_backend}/rust-toolchain";
        rcb = pkgs.stdenv.mkDerivation {
          pname = "rustc_cranelift_backend";
          version = "1.0";
          buildInputs = [c_rust];
          nativeBuildInputs = with pkgs; [gawk fd];
          srcs = ["${rustc_cranelift_backend_src}" "${c_rust}"];
          sourceRoot = ".";
          postUnpack = ''
            rust_dir="$(fd . --max-depth 1 | awk '!/source/ && !/env-vars/')"

            # remove unneeded stuff
            rm -r "$rust_dir"/{bin,nix-support,share};
            rm -r "$rust_dir"/lib/rustlib/{etc,src,rustc-src};

            cp -r "$rust_dir"/. source/extra_dependencies
            rm -r "$rust_dir"
            cd source
            '';
          postPatch = ''
            # patch bins
            for file in $(fd . --type file);do
                file="$(file --mime "$file" | awk 'BEGIN{FS=":"}/application\/x-pie-executable/{print $1}')";
                if [ "$file" ]; then
                    echo "file: '$file' matches";
                    correct_interpreter_path="$(ldd "$file" | tail -n1 | awk 'BEGIN{FS="=> "} {print $2}' | awk 'BEGIN{FS=" "}{print $1}')"
                    echo "correct interpreter path is: '$correct_interpreter_path'"
                    patchelf --set-interpreter "$correct_interpreter_path" "$file"

                    if [ "$(patchelf --print-interpreter "$file")" = "$correct_interpreter_path" ];then
                      echo "Set interpreter";
                    else
                      echo "Failed to set interprter, the interpreter still is $(patchelf --print-interpreter )";
                      exit 1
                    fi
                fi
            done

            # patch libs
            all_files=$(mktemp);
            for file in $(fd .);do
                canonical_path="$(readlink -f "$file")"
                file="$(file --mime "$canonical_path" | awk 'BEGIN{FS=":"}/application\/x-sharedlib/{print $1}')";
                if [ "$file" ]; then
                    echo "$file" >> $all_files;
                fi
            done
            while read -r file; do
                echo "___________________";
                echo "Checking file: '$file'";
                is_missing="$(ldd "$file" | awk 'BEGIN{FS="=>"}{if (/not found/){print $1}}')"
                if [ "$is_missing" ];then
                    echo "Warning: The following things are missing:";
                    for line in $is_missing; do
                        echo "  $line";
                    done
                    echo
                    for line in $is_missing; do
                        echo "Searching for a substitute for '$line'"
                        substitute="$(grep "$line" "$all_files" | awk 'BEGIN{FS=" "}{print $1}' | tail -n1)";
                        if [ "$substitute" ]; then
                            echo "Found '$substitute', which can substitute '$line'"
                            echo "Patching.."
                            patchelf --replace-needed "$line" "$(readlink -f "$substitute")" "$file";
                        else
                            echo "Error: Failed to find a substitute"
                        fi
                    done
                else
                    echo "This file is not missing anything"
                fi
            done < $all_files
            rm $all_files
          '';
          installPhase = ''
            install -d $out/
            cp -r ./. $out/
          '';
        };
        pkgs = import nixpkgs {
          inherit system;
          overlays = [(import rust-overlay)];
        };

        nightly = true;
        rust =
          if nightly
          then pkgs.rust-bin.selectLatestNightlyWith (toolchain: toolchain.default)
          else pkgs.rust-bin.stable.latest.default;

        craneLib = (crane.mkLib pkgs).overrideToolchain rust;

        nativeBuildInputs = with pkgs; [
          pkg-config
          mold
          rcb
        ];
        buildInputs = with pkgs; [
          openssl
          lua54Packages.lua
        ];

        craneBuild = craneLib.buildPackage {
          src = craneLib.cleanCargoSource ./.;

          doCheck = true;
          inherit nativeBuildInputs buildInputs;
        };
      in {
        packages = {
          default = craneBuild;
        };

        app.default = {
          type = "app";
          program = "${self.packages.${system}.default}/bin/trinitix";
        };

        devShells.default = pkgs.mkShell {
          packages = with pkgs; [
            nil
            alejandra
            statix
            ltex-ls

            rust
            rust-analyzer
            cargo-edit
            cargo-expand
          ];
          inherit nativeBuildInputs buildInputs;
        };
      });
}
# vim: ts=2