feat: Add host sydpc

My, this is a lot TwT.  Much work was batched as part of the transition from
guix-rebound to nixos-testbed/sydpc.

- Discord/Vesktop module & config.
- Syncthing setup.
- Assorted Emacs changes.
- Waybar config.
- Niri config.
- Steam config.
- Some MPD.
- Stylix config.
- Files/Impermanence things.
- Enable Ghostty.
- God knows what else.

modules/home/users/crumb/emacs/modules/lang/syd-lang-kdl.el

@@ -0,0 +1,9 @@
+;;; syd-lang-kdl.el -*- lexical-binding: t; -*-
+
+(use-package kdl-ts-mode
+  :mode "\\.kdl\\'"
+  :straight (:type git
+             :host github
+             :repo "dataphract/kdl-ts-mode"))
+
+(provide 'syd-lang-kdl)

modules/home/users/crumb/emacs/modules/lang/syd-lang-nix.el

@@ -13,8 +13,16 @@
   (nix-repl)
   (current-buffer))
 
+(evil-define-text-object syd-nix-obj-outer-binding (count _beg _end _type)
+  "TODO"
+  :type 'inclusive
+  (let* ((cleanup-p (memq evil-this-operator '(evil-delete)))
+         (node (treesit-thing-at-point "binding" "nested")))
+    (list (treesit-node-start node)
+          (treesit-node-end node))))
+
 (use-package nix-mode
-  :mode "\\.nix\\'"
+  ;; :mode "\\.nix\\'"
   :init
   (add-to-list 'auto-mode-alist
                (cons (rx "/flake.lock'")
@@ -24,17 +32,30 @@
   :config
   (add-hook 'nix-mode-hook #'lsp)
   (set-popup-rule! (rx bol "*nixos-options-doc*" eol) :ttl 0 :quit t)
-  (set-repl-handler! 'nix-mode #'syd-nix-open-nix-repl)
+  (set-repl-handler! '(nix-mode nix-ts-mode) #'syd-nix-open-nix-repl)
   (dolist (c '(?- ?_))
     (modify-syntax-entry c "w" nix-mode-syntax-table))
-
+  
   ;; Inform Smartparens and Evil-surround of Nix's alternative string syntax.
   (with-eval-after-load 'smartparens
-    (sp-local-pair 'nix-mode "''" "''"))
-  (syd-add-hook 'nix-mode-hook
+    (sp-local-pair '(nix-mode nix-ts-mode) "''" "''"))
+  (syd-add-hook '(nix-mode-hook nix-ts-mode-hook)
     (defun syd-nix--configure-evil-surround-h ()
       (with-eval-after-load 'evil-surround
         (push '(?Q . ("''" . "''"))
               evil-surround-pairs-alist)))))
 
+(use-package nix-ts-mode
+  :mode "\\.nix\\'"
+  :config
+  (require 'nix-mode)
+  (general-def
+    :keymaps 'nix-ts-mode-map
+    :states '(visual operator)
+    "ad" #'syd-nix-obj-outer-binding)
+  (syd-add-hook 'nix-ts-mode-hook
+    (defun syd-nix-set-syntax-table-h ()
+      "Set the syntax table in `nix-ts-mode' buffers to `nix-mode-syntax-table'."
+      (set-syntax-table nix-mode-syntax-table))))
+
 (provide 'syd-lang-nix)