From 80ca830bf80d62980e2beb5d02c94168f34b2bf9 Mon Sep 17 00:00:00 2001
From: Tim McCarthy <thoomfish@gmail.com>
Date: Tue, 15 Sep 2026 15:05:30 -0700
Subject: [PATCH] Giant's deep tmux monitor

---
 emacs/init.el | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/emacs/init.el b/emacs/init.el
index ceb0ea5..9d099d6 100644
--- a/emacs/init.el
+++ b/emacs/init.el
@@ -551,14 +551,16 @@ EMACS-ALTERNATIVE is the Emacs equivalent (e.g., 'C-s')."
           "\\*Flycheck errors\\*"
           help-mode
           compilation-mode
+          "\\`\\*gd-tmux\\*\\'"
           "eshell-popup\\*$"))
 
   (defun my/popper-window-height (window)
-    "Resize eshell popups to half the frame height; fit other popups."
+    "Resize terminal popups to half the frame height; fit other popups."
     (let ((buffer (window-buffer window)))
       (if (with-current-buffer buffer
             ;; Eshell displays a new buffer before enabling `eshell-mode'.
             (or (derived-mode-p 'eshell-mode)
+                (equal (buffer-name) "*gd-tmux*")
                 (string-match-p "eshell-popup\\*$" (buffer-name))))
           ;; A functional `window-height' action must resize the window.
           (let ((height (/ (frame-height (window-frame window)) 2)))
@@ -1139,15 +1141,48 @@ any directory proffered by `consult-dir'."
 ;;;; Eat
 (use-package eat
   :ensure t
+  :bind (("C-o g" . my/gd-tmux-toggle))
   :custom
   (eat-term-name "xterm-256color")
   :init
+  (defun my/gd-tmux-toggle ()
+    "Show or hide the tmux terminal on gd.
+Connect the Tubnix tunnel in WireGuard first.  Hiding the popup keeps
+SSH alive; opening it after SSH exits reconnects to the existing tmux
+session.  With multiple sessions, tmux chooses its default session."
+    (interactive)
+    (if-let* ((window (get-buffer-window "*gd-tmux*")))
+        (quit-window nil window)
+      (require 'eat)
+      ;; Always launch local SSH, even when called from a TRAMP buffer.
+      (let* ((default-directory (expand-file-name "~/"))
+             (buffer (eat-make "gd-tmux" "ssh" nil
+                               "-t" "-o" "ConnectTimeout=10"
+                               "-o" "ServerAliveInterval=15"
+                               "-o" "ServerAliveCountMax=3"
+                               "gd" "tmux attach-session")))
+        (with-current-buffer buffer
+          (use-local-map (copy-keymap (current-local-map)))
+          (local-set-key (kbd "q") #'quit-window)
+          ;; Eat's input modes take precedence over the major-mode map.
+          (dolist (mode '(eat--semi-char-mode eat--char-mode))
+            (let ((map (make-sparse-keymap)))
+              (set-keymap-parent map (alist-get mode minor-mode-map-alist))
+              (define-key map (kbd "q") #'quit-window)
+              (setq-local minor-mode-overriding-map-alist
+                          (cons (cons mode map)
+                                (assq-delete-all
+                                 mode minor-mode-overriding-map-alist))))))
+        (pop-to-buffer buffer))))
+
   (eval-after-load 'eshell #'eat-eshell-mode)
   (eval-after-load 'eshell #'eat-eshell-visual-command-mode)
   :config
   (defun advise-eat-keymap (map)
     (define-key map [?\C-o] nil)
     (define-key map (vector meta-prefix-char ?`) nil)
+    ;; Let Popper dismiss terminal windows without sending M-o remotely.
+    (define-key map (vector meta-prefix-char ?o) nil)
     (define-key map [S-v] #'eat-yank))
 
   (define-advice eat-eshell-semi-char-mode