dotfiles/dot_local/bin/executable_ghostty-tmux

#!/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.

# A server started here inherits this PATH. Ghostty launched from the desktop
# has no shell init, so add mise's shims for tools tmux plugins shell out to
# (bun for tmux-palette, fzf, zoxide).
[[ -d $HOME/.local/share/mise/shims ]] && PATH="$HOME/.local/share/mise/shims:$PATH"

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

[[ -n $oldest ]] && exec tmux attach-session -t "=$oldest"
exec tmux new-session