Auto-detach when all agents in window exit

Add agent-cmd.sh wrapper that detaches the client when all panes in the
current window have exited. This allows multiple agent windows (one per
directory) while automatically returning to the shell when done with a
particular window's agents.

- remain-on-exit keeps panes alive after agent exits to check status
- Wrapper counts running panes and detaches when it's the last one

agent-cmd.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+# Wrapper that runs an agent command, then detaches if all panes in window are dead
+
+# Run the agent command (don't use set -e, agent may exit non-zero)
+"$@" || true
+
+# Brief delay to let tmux update pane status
+sleep 0.1
+
+# Count panes still running (pane_dead=0)
+# Note: our own pane counts as running since this script is executing
+running=$(tmux list-panes -F '#{pane_dead}' | grep -c '^0$' || true)
+
+# If we're the only pane still running, all others are dead - detach
+[ "$running" -le 1 ] && tmux detach-client

agent.sh

@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+
+set -e
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# Check which agent commands are available
+agents=()
+command -v claude &>/dev/null && agents+=(claude)
+command -v opencode &>/dev/null && agents+=(opencode)
+command -v gemini &>/dev/null && agents+=(gemini)
+
+if [ ${#agents[@]} -eq 0 ]; then
+  echo "No agent commands found (claude, gemini)"
+  exit 1
+fi
+
+# Use the current directory (set via display-popup -d)
+dir="${PWD:-$HOME}"
+# Use the directory basename as window name
+window_name=$dir
+
+# Create the agent session if it doesn't exist
+if ! tmux has-session -t agent; then
+  tmux new-session -ds agent -c "$dir" -n "$window_name" "$script_dir/agent-cmd.sh" "${agents[0]}"
+  [ ${#agents[@]} -gt 1 ] && tmux split-window -h -t agent:0 "$script_dir/agent-cmd.sh" "${agents[1]}"
+  # Store the directory in a window option for later matching
+  tmux set-window-option -t agent @agent_dir "$dir"
+  tmux set-option -t agent status off
+  tmux set-option -t agent remain-on-exit on
+  tmux attach-session -t agent
+  exit 0
+fi
+
+# Search for an existing window with matching directory
+target_window=""
+for window_id in $(tmux list-windows -t agent -F '#{window_id}'); do
+  window_dir=$(tmux show-window-option -t "$window_id" -v @agent_dir 2>/dev/null || true)
+  if [ "$window_dir" = "$dir" ]; then
+    target_window="$window_id"
+    break
+  fi
+done
+
+if [ -n "$target_window" ]; then
+  # Select the existing window
+  tmux select-window -t "$target_window"
+else
+  # Create a new window with agents
+  tmux new-window -t agent -c "$dir" -n "$window_name" "$script_dir/agent-cmd.sh" "${agents[0]}"
+  [ ${#agents[@]} -gt 1 ] && tmux split-window -h -t agent -c "$dir" "$script_dir/agent-cmd.sh" "${agents[1]}"
+  # Store the directory in a window option for later matching
+  tmux set-window-option -t agent @agent_dir "$dir"
+fi
+
+# Attach to the session
+tmux attach-session -t agent

check-version.sh

@@ -0,0 +1,96 @@
+#!/usr/bin/env bash
+
+# Compare the current tmux version against a given version.
+# Exit: 0 if comparison is true, 1 if false
+
+set -euo pipefail
+
+usage() {
+  echo "usage: $0 <operator> <version>" >&2
+  echo "operators: < <= == >= >" >&2
+}
+
+if [[ ${1:-} == "-h" || ${1:-} == "--help" ]]; then
+  usage
+  exit 0
+fi
+
+if [[ $# -ne 2 ]]; then
+  usage
+  exit 1
+fi
+
+operator="$1"
+target_version="$2"
+
+# Extract tmux version (e.g., "tmux 3.3a" -> "3.3a")
+current_version=$(tmux -V | sed 's/^tmux //')
+
+# Compare two version strings
+# Returns: -1 if v1 < v2, 0 if v1 == v2, 1 if v1 > v2
+compare_versions() {
+  local v1="$1"
+  local v2="$2"
+
+  # Strip trailing letters (e.g., "3.3a" -> "3.3") and save them
+  local v1_suffix="${v1##*[0-9]}"
+  local v2_suffix="${v2##*[0-9]}"
+  v1="${v1%[a-zA-Z]*}"
+  v2="${v2%[a-zA-Z]*}"
+
+  # Split into components
+  IFS='.' read -ra v1_parts <<< "$v1"
+  IFS='.' read -ra v2_parts <<< "$v2"
+
+  # Compare numeric parts
+  local max_len=$(( ${#v1_parts[@]} > ${#v2_parts[@]} ? ${#v1_parts[@]} : ${#v2_parts[@]} ))
+  for ((i = 0; i < max_len; i++)); do
+    local p1="${v1_parts[i]:-0}"
+    local p2="${v2_parts[i]:-0}"
+    if ((p1 < p2)); then
+      echo -1
+      return
+    elif ((p1 > p2)); then
+      echo 1
+      return
+    fi
+  done
+
+  # Numeric parts equal, compare suffixes (no suffix < a < b < ...)
+  # A letter suffix indicates a patch release, so 3.6a > 3.6
+  if [[ -z "$v1_suffix" && -n "$v2_suffix" ]]; then
+    echo -1
+    return
+  elif [[ -n "$v1_suffix" && -z "$v2_suffix" ]]; then
+    echo 1
+    return
+  elif [[ "$v1_suffix" < "$v2_suffix" ]]; then
+    echo -1
+    return
+  elif [[ "$v1_suffix" > "$v2_suffix" ]]; then
+    echo 1
+    return
+  fi
+
+  echo 0
+}
+
+result=$(compare_versions "$current_version" "$target_version")
+
+case "$operator" in
+  '<')
+    [[ "$result" -eq -1 ]] && exit 0 || exit 1 ;;
+  '<=')
+    [[ "$result" -le 0 ]] && exit 0 || exit 1 ;;
+  '==')
+    [[ "$result" -eq 0 ]] && exit 0 || exit 1 ;;
+  '>=')
+    [[ "$result" -ge 0 ]] && exit 0 || exit 1 ;;
+  '>')
+    [[ "$result" -eq 1 ]] && exit 0 || exit 1 ;;
+  *)
+    echo "error: invalid operator: $operator" >&2
+    usage
+    exit 1
+    ;;
+esac

hooks/session-create.sh

@@ -4,6 +4,6 @@ session_name=$(tmux display-message -p '#S')
 session_layout=~/.local/share/tmux/layouts/session-$session_name
 if [ -f $session_layout ]; then
   $session_layout
-else
+elif [ "$session_name" != "agent" ]; then
   tmux rename-window home
 fi

layouts/window-auto

@@ -2,7 +2,7 @@
 
 cols=`tmux display -p "#{pane_width}"`
 lines=`tmux display -p "#{pane_height}"`
-width=$(( $cols / 2 )).0
+width=$(( $cols / 2.5 ))
 height=$lines.0
 ratio=$(( ($width / $height) * 100 ))
 

theme.tmux

@@ -11,7 +11,8 @@ setw -g status-style fg=colour240,bg=colour233
 # Right status style shows system info, date, and time.
 setw -g status-right "#[fg=colour240]#(cat ~/.cache/tmux/system-info)#[fg=white] %a %d-%m-%y %H:%M "
 setw -g status-right-style fg=white,bg=colour233
-if -b '[ "`uname`" != "Darwin" ]' \
+if -b '[ "`uname`" = "Darwin" ]' \
+  'run "tmux setw -g status-right-length $((`sysctl -n hw.ncpu` + 48))"' \
   'run "tmux setw -g status-right-length $((`nproc --all` + 48))"'
 
 # Active window status style

tmux.conf

@@ -28,7 +28,7 @@ set -g status-interval 2
 set -g default-terminal "tmux-256color"
 
 # Enable true-color
-if '[[ "$TMUX_VERSION" < "3.2" ]]' \
+if '~/.config/tmux/check-version.sh "<" 3.2' \
   'set-option -as terminal-features ",xterm*:Tc"' \
   'set-option -as terminal-features ",xterm*:RGB"'
 
@@ -49,7 +49,7 @@ unbind -T copy-mode-vi MouseDragEnd1Pane
 # Enable changing cursor shape per pane, vim or zsh should emit escape
 # sequences to change cursor shape.
 # iTerm2 only requires this before tmux 2.9
-if '[ -n $ITERM_PROFILE ] && [[ "$TMUX_VERSION" < "2.9" ]]' \
+if '[ -n $ITERM_PROFILE ] && ~/.config/tmux/check-version.sh "<" 2.9' \
   'set -ga terminal-overrides "*:Ss=\E]1337;CursorShape=%p1%d\7"'
 # VTE compatible terminals.
 if '[ ! -n $ITERM_PROFILE ]' \
@@ -66,15 +66,19 @@ bind a run-shell ~/.local/share/tmux/layouts/window-auto
 if -b '[ "`uname`" = "Darwin" ]' \
   'set -g default-command "reattach-to-user-namespace -l $SHELL"'
 
-if -b '[ "$TMUX_VERSION" > "3.2" ]' {
-  # Open a popup with running the default shell
-  bind T display-popup -S fg=#54546D -b rounded -d '#{pane_current_path}' -E $SHELL
-  # Open a popup with session creator/switcher
-  bind S display-popup -B -w 60 -h 10 -E '~/.config/tmux/session.sh'
-  # Open a popup with project selector
-  bind P display-popup -B -w 60 -h 10 -E '~/.config/tmux/project.sh'
-  # Open a popup to pick an interpreter then launch it
+if -b '~/.config/tmux/check-version.sh ">=" 3.2 && ~/.config/tmux/check-version.sh "<" 3.3' {
+  bind A display-popup -d '#{pane_current_path}' -w 75% -h 90% -E ~/.config/tmux/agent.sh
+  bind I display-popup -d '#{pane_current_path}' -E '$SHELL -i ~/.config/tmux/interpreter.sh'
+  bind P display-popup -w 60 -h 10 -E '~/.config/tmux/project.sh'
+  bind S display-popup -w 60 -h 10 -E '~/.config/tmux/session.sh'
+  bind T display-popup -d '#{pane_current_path}' -E $SHELL
+}
+if -b '~/.config/tmux/check-version.sh ">=" 3.3' {
+  bind A display-popup -S fg=#54546D -b rounded -d '#{pane_current_path}' -w 75% -h 90% -E ~/.config/tmux/agent.sh
   bind I display-popup -S fg=#54546D -b rounded -d '#{pane_current_path}' -E '$SHELL -i ~/.config/tmux/interpreter.sh'
+  bind P display-popup -B -w 60 -h 10 -E '~/.config/tmux/project.sh'
+  bind S display-popup -B -w 60 -h 10 -E '~/.config/tmux/session.sh'
+  bind T display-popup -S fg=#54546D -d '#{pane_current_path}' -E $SHELL
 }
 
 # Restore old next/previous window bindings