{
  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;
    };
    #    # dependencies
    #    rust_regex ={
    #      url = "git+https://github.com/rust-lang/regex.git";
    #      flake = false;
    #    };
    #    rust_portable_simd = {
    #      url = "git+https://github.com/rust-lang/portable-simd.git";
    #      flake = false;
    #    };
    #    rust_rand = {
    #      url = "git+https://github.com/rust-random/rand.git";
    #      flake = false;
    #    };
  };

  outputs = {
    self,
    nixpkgs,
    crane,
    flake-utils,
    rust-overlay,
    rustc_cranelift_backend,
    rustc_cranelift_backend_src,
    #    rust_regex,
    #    rust_portable_simd,
    #    rust_rand,
    ...
  }:
    flake-utils.lib.eachDefaultSystem (system: let
        rcb_deps = let
          c_rust = pkgs.rust-bin.fromRustupToolchainFile "${rustc_cranelift_backend}/rust-toolchain";
        in
          pkgs.stdenv.mkDerivation {
            pname = "rustc_cranelift_backend_dependencies";
            version = "1.0";
            nativeBuildInputs = with pkgs; [git curl cacert c_rust];
            src = "${rustc_cranelift_backend}";
            # old implementation {{{
            #"${rust_regex}" "${rust_portable_simd}" "${rust_rand}"
            #];
            #sourceRoot = "source";
            #            preUnpack = ''
            #            #set -x;
            #            unpackCmdHooks=(_defaultUnpack);
            #            checkForHashToName() {
            #              case "$1" in
            #                "regex")
            #                    echo source/download/regex
            #                    ;;
            #                "portable-simd")
            #                    echo source/download/portable-simd
            #                    ;;
            #                "rand")
            #                    echo source/download/rand
            #                    ;;
            #                "rustc_codegen_cranelift")
            #                    echo source
            #                    ;;
            #                *)
            #                    echo "Warning: Unable to turn hash ($1) to name!" 1>&2
            #                    echo "Using another method" 1>&2
            #                    echo null;
            #                    ;;
            #                esac
            #            }
            #            fail() {
            #              echo "$@";
            #              exit 1;
            #            }
            #            _defaultUnpack(){
            #                local fn="$1"
            #                local destination
            #                local finalDestination
            #
            #                # extrem hacky solution to turn the nix hash path to useful names:
            #                destination="$(sed -n '2p' "$fn/Cargo.toml" | sed 's|name = "||' | sed 's|"||')"
            #
            #                finalDestination="$(checkForHashToName "$destination")"
            #                 if [ "$finalDestination" = "null" ]; then
            #                    if grep "Portable SIMD" "$fn"/README.md > /dev/null 2>&1; then
            #                      destination="portable-simd";
            #                    else
            #                      echo "Can not grep readme directly"
            #                    fi
            #                 fi
            #
            #                finalDestination="$(checkForHashToName "$destination")"
            #                if [ "$finalDestination" = "null" ]; then
            #                  fail "No idea how to turn your hash to a name, sorry!";
            #                fi
            #
            #                echo "Final destination is '$finalDestination'"
            #                destination="$finalDestination"
            #                echo "Copying '$fn' to '$destination'"
            #
            #                mkdir --parents "$destination";
            #                # We can't preserve hardlinks because they may have been
            #                # introduced by store optimization, which might break things
            #                # in the build.
            #                cp -pr --reflink=auto -- "$fn"/. "$destination"
            #                chmod -R u+w "$destination"
            #            }
            #            '';
            # }}}
            buildPhase = ''
              bash ./y.sh prepare
            '';
            installPhase = ''
              install -d $out/
              cp -r ./. $out/
            '';
            fixupPhase = ''
              set -x
            ''; # skip it
            CARGO = "${c_rust}/bin/cargo";
            RUSTC = "${c_rust}/bin/rustc";
            RUSTDOC = "${c_rust}/bin/rustdoc";
            CARGO_HOME = "/build/cargo";

            outputHashAlgo = "sha512";
            outputHashMode = "recursive";
            outputHash = "sha512-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==";
          };
        rcb = let
          c_rust = pkgs.rust-bin.fromRustupToolchainFile "${rustc_cranelift_backend}/rust-toolchain";
        in
          pkgs.stdenv.mkDerivation {
            pname = "rustc_cranelift_backend";
            version = "1.0";
            nativeBuildInputs = [c_rust];
            src = "${rcb_deps}";
            buildPhase = ''
              bash ./y.sh build
            '';
            installPhase = ''
              install -d $out/
              cp -r ./dist/. $out/
            '';
            CARGO = "${c_rust}/bin/cargo";
            RUSTC = "${c_rust}/bin/rustc";
            RUSTDOC = "${c_rust}/bin/rustdoc";
            CARGO_HOME = "/build/cargo";
          };
        c_rust = pkgs.rust-bin.fromRustupToolchainFile "${rustc_cranelift_backend}/rust-toolchain";
        rcb_better = pkgs.stdenv.mkDerivation {
          pname = "rustc_cranelift_backend";
          version = "1.0";
          buildInputs = [c_rust];
          nativeBuildInputs = with pkgs; [gawk fd];
          srcs = ["${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_better
          #self.packages."${system}".cranelift-deps
        ];
        buildInputs = with pkgs; [
          openssl
        ];

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

          doCheck = true;
          inherit nativeBuildInputs buildInputs;
        };
      in {
        packages = {
          default = craneBuild;
          cranelift = rcb_better;
          cranelift-deps = c_rust;
        };

        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