Add :os tty module

- Moves clipetty to its own, opt-in module (#2671, #3195, #3498)
- Fix cursor shape changing between evil states (#1994)
- Moves `xterm-mouse-mode` and `visible-cursor` config out of core.

modules/os/tty/config.el

@@ -0,0 +1,34 @@
+;;; os/tty/config.el -*- lexical-binding: t; -*-
+
+;; Some terminals offer two different cursors: a "visible" static cursor and a
+;; "very visible" blinking one. By default, Emacs uses the very visible cursor
+;; and will switch back to it when Emacs is started or resumed. A nil
+;; `visible-cursor' prevents this.
+(setq visible-cursor nil)
+
+;; Enable the mouse in terminal Emacs
+(add-hook 'tty-setup-hook #'xterm-mouse-mode)
+
+;; Windows terminals don't support what I'm about to do.
+(add-hook! 'tty-setup-hook
+  (defun doom-init-clipboard-in-tty-emacs-h ()
+    ;; Fix the clipboard in tty Emacs by...
+    (if (featurep! +osc)
+        ;; ...communicating with the clibpoard through OSC escape codes (must
+        ;; use a terminal that supports it)
+        (and (require 'clipetty nil t)
+             (global-clipetty-mode +1))
+      ;; ...OR piping clipboard I/O through xclip, xsel, pb{copy,paste},
+      ;; wl-copy, termux-clipboard-get, or getclip (cygwin); depending on what
+      ;; is available.
+      (and (require 'xclip nil t)
+           (xclip-mode +1)))))
+
+  (when (featurep! :editor evil)
+    ;; Fix cursor shape-changing in the terminal. Only supported in XTerm, Gnome
+    ;; Terminal, iTerm, Konsole, dumb (etc. mintty), and Apple Terminal.app. If
+    ;; using Apple Terminal.app, install
+    ;; http://www.culater.net/software/SIMBL/SIMBL.php and
+    ;; https://github.com/saitoha/mouseterm-plus/releases. That makes to support
+    ;; VT's DECSCUSR sequence.
+    (add-hook 'tty-setup-hook #'evil-terminal-cursor-changer-activate))