From 43ec46f699b0f87dcfdfd15c9f293b40e1d38f8d Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@hey.com>
Date: Mon, 11 May 2026 18:21:44 +0200
Subject: [PATCH] Add tds 4-way

---
 default/bash/fns/tmux | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/default/bash/fns/tmux b/default/bash/fns/tmux
index 0144f2eb..de62c625 100644
--- a/default/bash/fns/tmux
+++ b/default/bash/fns/tmux
@@ -34,6 +34,33 @@ tdl() {
   tmux send-keys -t "$editor_pane" "$EDITOR ." C-m
 
   # Select the nvim pane for focus
+  tmux select-pane -t "$opencode_pane"
+}
+
+# Create a Tmux Dev Square layout with editor, diff watch, terminal, and opencode
+# Usage: tds
+tds() {
+  [[ -n $1 ]] && { echo "Usage: tds"; return 1; }
+  [[ -z $TMUX ]] && { echo "You must start tmux to use tds."; return 1; }
+
+  local current_dir="${PWD}"
+  local editor_pane diff_pane terminal_pane opencode_pane
+
+  editor_pane="$TMUX_PANE"
+
+  tmux rename-window -t "$editor_pane" "$(basename "$current_dir")"
+
+  terminal_pane=$(tmux split-window -v -p 50 -t "$editor_pane" -c "$current_dir" -P -F '#{pane_id}')
+  diff_pane=$(tmux split-window -h -p 50 -t "$editor_pane" -c "$current_dir" -P -F '#{pane_id}')
+  opencode_pane=$(tmux split-window -h -p 50 -t "$terminal_pane" -c "$current_dir" -P -F '#{pane_id}')
+
+  tmux send-keys -t "$editor_pane" -l "nvim ."
+  tmux send-keys -t "$editor_pane" C-m
+  tmux send-keys -t "$diff_pane" -l "hunk diff --watch"
+  tmux send-keys -t "$diff_pane" C-m
+  tmux send-keys -t "$opencode_pane" -l "opencode"
+  tmux send-keys -t "$opencode_pane" C-m
+
   tmux select-pane -t "$editor_pane"
 }