{
  fetchFromGitHub,
  rustPlatform,
  alejandra,
  basedpyright,
  bash-language-server,
  clang-tools,
  cmake-format,
  cmake-language-server,
  deadnix,
  deno,
  dprint,
  formats,
  gdb,
  kdePackages,
  lib,
  nil,
  ruff,
  shfmt,
  typescript-language-server,
  vscode-langservers-extracted,
  zls,
  ...
}: let
  inherit (lib.meta) getExe getExe';

  toml = formats.toml {};

  # a newer nil version, for pipes support.
  new-nil = nil.overrideAttrs (_: {
    version = "unstable-18-07-2025";

    src = fetchFromGitHub {
      owner = "oxalica";
      repo = "nil";
      rev = "524ae2d67dd84d99a10f409ed6cd8e4e7b3cae3f";
      hash = "sha256-Uy2qzd+fMoBcp4NPSO7DavEC1pGMegmAqoEMvmXbIQU=";
    };
    cargoDeps = rustPlatform.fetchCargoVendor {
      inherit (new-nil) src;
      hash = "sha256-Sljr3ff8hl/qm/0wqc1GXsEr1wWn7NAXmdrd5wHzUX8=";
    };
  });

  new-deadnix = deadnix.overrideAttrs (finalAttrs: previousAttrs: {
    version = "unstable-15-07-2025";
    src = fetchFromGitHub {
      owner = "astro";
      repo = "deadnix";
      rev = "d75457b95d7cfa82fcd60970939f76fccfce19e5";
      hash = "sha256-O/z2neAXL8JNkGosvxC+DyZnnJ8zYP9XHApxHVmlzfY=";
    };
    cargoDeps = rustPlatform.fetchCargoVendor {
      inherit (new-deadnix) src;
      hash = "sha256-O8yhqyPflOvQXAA19k1XpbrHysgV5VNWLBX0l5Q5GkM=";
    };
  });
  helix-languages = {
    language = let
      mark = lang: {
        command = getExe deno;
        args = ["fmt" "-" "--ext" lang];
      };
    in [
      {
        name = "bash";
        auto-format = true;
        formatter = {
          command = getExe shfmt;
          args = ["-i" "2"];
        };
      }
      {
        name = "clojure";
        injection-regex = "(clojure|clj|edn|boot|yuck)";
        file-types = ["clj" "cljs" "cljc" "clje" "cljr" "cljx" "edn" "boot" "yuck"];
      }
      {
        name = "cmake";
        auto-format = true;
        language-servers = ["cmake-language-server"];
        formatter = {
          command = getExe cmake-format;
          args = ["-"];
        };
      }
      {
        name = "javascript";
        auto-format = true;
        language-servers = ["dprint" "typescript-language-server"];
      }
      {
        name = "json";
        formatter = mark "json";
      }
      {
        name = "markdown";
        auto-format = true;
        formatter = mark "md";
        language-servers = ["taplo"];
      }
      {
        name = "nix";
        language-servers = ["nil"];
      }
      {
        name = "qml";
        language-servers = ["qmlls"];
      }
      {
        name = "python";
        auto-format = true;
        language-servers = [
          "basedpyright"
          "ruff"
        ];
      }
      {
        name = "typescript";
        auto-format = true;
        language-servers = ["dprint" "typescript-language-server"];
      }
      {
        name = "rust";
      }
      {
        name = "c";
        auto-format = true;
        language-servers = ["clangd"];
      }
      {
        name = "zig";
        auto-format = true;
      }
      {
        name = "c";
        debugger = {
          name = "gdb";
          command = getExe gdb;
          transport = "stdio";
          templates = [
            {
              name = "binary";
              request = "launch";
              completion = [
                {
                  name = "binary";
                  completion = "filename";
                }
              ];
              args = {
                program = "{0}";
                runInTerminal = true;
              };
            }
          ];
        };
      }
    ];

    language-server = {
      bash-language-server = {
        command = getExe bash-language-server;
        args = ["start"];
      };

      rust-analyzer = {
        config.rust-analyzer = {
          checkOnSave.command = "clippy";
          procMacro.enable = true;
          cargo = {
            loadOutDirsFromCheck = true;
            features = "all";
          };
          assist = {
            preferSelf = true;
          };
          check = {
            command = "clippy";
            extraArgs = ["--" "-W" "clippy::pedantic" "-W" "clippy::nursery" "-W" "clippy::perf"];
          };
          lens = {
            references = true;
            methodReferences = true;
          };
          completion.autoimport.enable = true;
          experimental.procAttrMacros = true;
          interpret.tests = true;
        };
      };

      clangd = {
        command = "${clang-tools}/bin/clangd";
        clangd.fallbackFlags = ["-std=c++2b"];
      };

      cmake-language-server = {
        command = getExe cmake-language-server;
      };

      deno-lsp = {
        command = getExe deno;
        args = ["lsp"];
        environment.NO_COLOR = "1";
        config.deno = {
          enable = true;
          lint = true;
          unstable = true;
          suggest = {
            completeFunctionCalls = false;
            imports = {hosts."https://deno.land" = true;};
          };
          inlayHints = {
            enumMemberValues.enabled = true;
            functionLikeReturnTypes.enabled = true;
            parameterNames.enabled = "all";
            parameterTypes.enabled = true;
            propertyDeclarationTypes.enabled = true;
            variableTypes.enabled = true;
          };
        };
      };
      dprint = {
        command = getExe dprint;
        args = ["lsp"];
      };

      nil = {
        command = getExe new-nil;
        # alejandro
        config.nil = {
          formatting.command = ["${getExe alejandra}" "-q"];
          diagnostics = {
            bindingEndHintMinLines = 3;
          };
          nix.flake = {
            autoArchive = true;
            # autoEvalInputs = true;
            nixpkgsInputName = "nixpkgs";
          };
        };
      };
      deadnix = {
        command = getExe new-deadnix;
      };

      typescript-language-server = {
        command = getExe typescript-language-server;
        args = ["--stdio"];
        config = {
          typescript-language-server.source = {
            addMissingImports.ts = true;
            fixAll.ts = true;
            organizeImports.ts = true;
            removeUnusedImports.ts = true;
            sortImports.ts = true;
          };
        };
      };
      ruff = {
        command = getExe ruff;
        args = ["server"];
      };

      qmlls = {
        command = getExe' kdePackages.qtdeclarative "qmlls";
        args = ["-E"];
      };
      basedpyright.command = "${basedpyright}/bin/basedpyright-langserver";

      vscode-css-language-server = {
        command = "${vscode-langservers-extracted}/bin/vscode-css-language-server";
        args = ["--stdio"];
        config = {
          provideFormatter = true;
          css.validate.enable = true;
          scss.validate.enable = true;
        };
      };
      zls = {
        command = getExe zls;
        config = {
          enable_build_on_save = true;
          build_on_save_args = ["check" "-fincremental" "--watch"];
          enable_autofix = false;
          warn_style = true;
          highlight_global_var_declarations = true;
        };
      };
    };
  };
in
  toml.generate "languages.toml" helix-languages