nvf/modules/plugins/languages/ruby.nix

{
  config,
  pkgs,
  lib,
  ...
}: let
  inherit (builtins) attrNames;
  inherit (lib.options) mkEnableOption mkOption;
  inherit (lib.modules) mkIf mkMerge;
  inherit (lib.nvim.types) mkGrammarOption diagnostics;
  inherit (lib.types) either listOf package str enum;
  inherit (lib.nvim.languages) diagnosticsToLua;

  cfg = config.vim.languages.ruby;

  defaultServer = "rubyserver";
  servers = {
    rubyserver = {
      package = pkgs.rubyPackages.solargraph;
      lspConfig = ''
        lspconfig.solargraph.setup {
          capabilities = capabilities,
          on_attach = attach_keymaps,
          flags = {
            debounce_text_changes = 150,
          },
          cmd = { "${pkgs.solargraph}/bin/solargraph", "stdio" }
        }
      '';
    };
  };

  # testing

  defaultFormat = "rubocop";
  formats = {
    rubocop = {
      package = pkgs.rubyPackages.rubocop;
      nullConfig = ''
        local conditional = function(fn)
          local utils = require("null-ls.utils").make_conditional_utils()
          return fn(utils)
        end

        table.insert(
          ls_sources,
          null_ls.builtins.formatting.rubocop.with({
            command="${pkgs.bundler}/bin/bundle",
            args = vim.list_extend(
              {"exec", "rubocop", "-a" },
              null_ls.builtins.formatting.rubocop._opts.args
            ),
          })
        )
      '';
    };
  };

  defaultDiagnosticsProvider = ["rubocop"];
  diagnosticsProviders = {
    rubocop = {
      package = pkgs.rubyPackages.rubocop;
      nullConfig = pkg: ''
        table.insert(
          ls_sources,
          null_ls.builtins.diagnostics.rubocop.with({
            command = "${lib.getExe pkg}",
          })
        )
      '';
    };
  };
in {
  options.vim.languages.ruby = {
    enable = mkEnableOption "Ruby language support";

    treesitter = {
      enable = mkEnableOption "Ruby treesitter" // {default = config.vim.languages.enableTreesitter;};
      package = mkGrammarOption pkgs "ruby";
    };

    lsp = {
      enable = mkEnableOption "Ruby LSP support" // {default = config.vim.languages.enableLSP;};

      server = mkOption {
        type = enum (attrNames servers);
        default = defaultServer;
        description = "Ruby LSP server to use";
      };

      package = mkOption {
        type = either package (listOf str);
        default = servers.${cfg.lsp.server}.package;
        description = "Ruby LSP server package, or the command to run as a list of strings";
      };
    };

    format = {
      enable = mkEnableOption "Ruby formatter support" // {default = config.vim.languages.enableFormat;};

      type = mkOption {
        type = enum (attrNames formats);
        default = defaultFormat;
        description = "Ruby formatter to use";
      };

      package = mkOption {
        type = package;
        default = formats.${cfg.format.type}.package;
        description = "Ruby formatter package";
      };
    };

    extraDiagnostics = {
      enable =
        mkEnableOption "Ruby extra diagnostics support"
        // {default = config.vim.languages.enableExtraDiagnostics;};

      types = diagnostics {
        langDesc = "Ruby";
        inherit diagnosticsProviders;
        inherit defaultDiagnosticsProvider;
      };
    };
  };

  config = mkIf cfg.enable (mkMerge [
    (mkIf cfg.treesitter.enable {
      vim.treesitter.enable = true;
      vim.treesitter.grammars = [cfg.treesitter.package];
    })

    (mkIf cfg.lsp.enable {
      vim.lsp.lspconfig.enable = true;
      vim.lsp.lspconfig.sources.ruby-lsp = servers.${cfg.lsp.server}.lspConfig;
    })

    (mkIf cfg.format.enable {
      vim.lsp.null-ls.enable = true;
      vim.lsp.null-ls.sources.ruby-format = formats.${cfg.format.type}.nullConfig;
    })

    (mkIf cfg.extraDiagnostics.enable {
      vim.lsp.null-ls.enable = true;
      vim.lsp.null-ls.sources = diagnosticsToLua {
        lang = "ruby";
        config = cfg.extraDiagnostics.types;
        inherit diagnosticsProviders;
      };
    })
  ]);
}