#!/bin/bash
# Ghostty's `command`: every Ghostty window gets its own tmux session, never
# a mirror of another window's. Reclaim the oldest detached session (left by
# a closed window, or restored by tmux-continuum after a reboot) so closed
# windows don't pile up sessions; otherwise start a new one. The first window
# after boot starts the server, which is what triggers continuum's restore.
# ponytail: two windows opened in the same instant can claim the same detached
# session; take a lock (flock) here if that ever bites.
#
# The session's @tab-bg is set to Ghostty's own background (its theme, not
# Omarchy's), so the tab arrows tmux paints in that color match the window.

oldest=$(tmux list-sessions -f '#{==:#{session_attached},0}' \
    -F '#{session_created} #{session_name}' 2>/dev/null | sort -n | head -1 | cut -d' ' -f2-)

bg=$(ghostty +show-config 2>/dev/null | sed -n 's/^background = //p')
set_bg=()
[[ -n $bg ]] && set_bg=(\; set-option @tab-bg "$bg")

if [[ -n $oldest ]]; then
    exec tmux attach-session -t "=$oldest" "${set_bg[@]}"
fi
exec tmux new-session "${set_bg[@]}"