nix-community.nixvim/plugins/languages/nvim-jdtls.nix

{
  pkgs,
  config,
  lib,
  ...
}:
with lib; let
  cfg = config.plugins.nvim-jdtls;
  helpers = import ../helpers.nix {inherit lib;};
in {
  options.plugins.nvim-jdtls =
    helpers.extraOptionsOptions
    // {
      enable = mkEnableOption "nvim-jdtls";

      package = helpers.mkPackageOption "nvim-jdtls" pkgs.vimPlugins.nvim-jdtls;

      cmd = helpers.mkNullOrOption (types.listOf types.str) ''
        The command that starts the language server.

        You should either set a value for this option, or, you can instead set the `data` (and
        `configuration`) options.

        ```nix
        plugins.nvim-jdtls = {
          enable = true;
          cmd = [
            "$\{pkgs.jdt-language-server}/bin/jdt-language-server"
            "-data" "/path/to/your/workspace"
            "-configuration" "/path/to/your/configuration"
            "-foo" "bar"
          ];
        };
        ```

        Or,
        ```nix
        plugins.nvim-jdtls = {
          enable = true;
          data =  "/path/to/your/workspace";
          configuration = "/path/to/your/configuration";
        };
        ```
      '';

      data = mkOption {
        type = types.nullOr types.str;
        default = null;
        example = "/home/YOUR_USERNAME/.cache/jdtls/workspace";
        description = ''
          eclipse.jdt.ls stores project specific data within the folder set via the -data flag.
          If you're using eclipse.jdt.ls with multiple different projects you must use a dedicated
          data directory per project.
        '';
      };

      configuration = mkOption {
        type = types.nullOr types.str;
        default = null;
        example = "/home/YOUR_USERNAME/.cache/jdtls/config";
        description = "Path to the configuration file.";
      };

      rootDir =
        helpers.defaultNullOpts.mkNullable
        (types.either types.str helpers.rawType)
        ''{ __raw = "require('jdtls.setup').find_root({'.git', 'mvnw', 'gradlew'})"; }''
        ''
          This is the default if not provided, you can remove it. Or adjust as needed.
          One dedicated LSP server & client will be started per unique root_dir
        '';

      settings =
        helpers.mkNullOrOption types.attrs
        ''
          Here you can configure eclipse.jdt.ls specific settings
          See https://github.com/eclipse/eclipse.jdt.ls/wiki/Running-the-JAVA-LS-server-from-the-command-line#initialize-request
          for a list of options.
        '';

      initOptions =
        helpers.mkNullOrOption types.attrs
        ''
          Language server `initializationOptions`
          You need to extend the `bundles` with paths to jar files if you want to use additional
          eclipse.jdt.ls plugins.

          See https://github.com/mfussenegger/nvim-jdtls#java-debug-installation

          If you don't plan on using the debugger or other eclipse.jdt.ls plugins, ignore this option
        '';
    };

  config = let
    cmd =
      if (cfg.cmd == null)
      then let
        data =
          if (cfg.data == null)
          then
            throw ''
              You have to either set the 'plugins.nvim-jdtls.data' or the 'plugins.nvim-jdtls.cmd'
              option.
            ''
          else cfg.data;
      in
        [
          "${pkgs.jdt-language-server}/bin/jdt-language-server"
        ]
        ++ ["-data" data]
        ++ (
          optionals (cfg.configuration != null)
          ["-configuration" cfg.configuration]
        )
      else cfg.cmd;

    options =
      {
        inherit cmd;
        root_dir = cfg.rootDir;
        inherit (cfg) settings;
        init_options = cfg.initOptions;
      }
      // cfg.extraOptions;
  in
    mkIf cfg.enable {
      extraPlugins = [cfg.package];

      extraPackages = [pkgs.jdt-language-server];

      autoCmd = [
        {
          event = "FileType";
          pattern = "java";
          callback.__raw = ''
            function ()
              require('jdtls').start_or_attach(${helpers.toLuaObject options})
            end
          '';
        }
      ];
    };
}