treewide: begin restructuring the module tree

modules/plugins/languages/tailwind.nix

@@ -0,0 +1,61 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  inherit (builtins) attrNames;
+  inherit (lib.options) mkEnableOption mkOption;
+  inherit (lib.modules) mkIf mkMerge;
+  inherit (lib.lists) isList;
+  inherit (lib.types) enum either listOf package str;
+  inherit (lib.nvim.lua) expToLua;
+
+  cfg = config.vim.languages.tailwind;
+
+  defaultServer = "tailwindcss-language-server";
+  servers = {
+    tailwindcss-language-server = {
+      package = pkgs.tailwindcss-language-server;
+      lspConfig = ''
+        lspconfig.tailwindcss.setup {
+          capabilities = capabilities;
+          on_attach = default_on_attach;
+          cmd = ${
+          if isList cfg.lsp.package
+          then expToLua cfg.lsp.package
+          else ''{"${cfg.lsp.package}/bin/tailwindcss-language-server", "--stdio"}''
+        }
+        }
+      '';
+    };
+  };
+in {
+  options.vim.languages.tailwind = {
+    enable = mkEnableOption "Tailwindcss language support";
+
+    lsp = {
+      enable = mkEnableOption "Tailwindcss LSP support" // {default = config.vim.languages.enableLSP;};
+
+      server = mkOption {
+        description = "Tailwindcss LSP server to use";
+        type = enum (attrNames servers);
+        default = defaultServer;
+      };
+
+      package = mkOption {
+        description = "Tailwindcss LSP server package, or the command to run as a list of strings";
+        example = ''[lib.getExe pkgs.jdt-language-server " - data " " ~/.cache/jdtls/workspace "]'';
+        type = either package (listOf str);
+        default = servers.${cfg.lsp.server}.package;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    (mkIf cfg.lsp.enable {
+      vim.lsp.lspconfig.enable = true;
+      vim.lsp.lspconfig.sources.css-lsp = servers.${cfg.lsp.server}.lspConfig;
+    })
+  ]);
+}