Scripts/bin/tmux-SESSION.sh

#!/usr/bin/env bash
set -euo pipefail # bash strict mode
# Save and restore the state of tmux sessions and windows.
# TODO: persist and restore the state & position of panes.
set -e

dump() {
    local d=$'\t'
    tmux list-windows -a -F "#S${d}#W${d}#{pane_current_path}"
}

save() {
    dump > ~/.tmux-session
}

terminal_size() {
    stty size 2>/dev/null | awk '{ printf "-x%d -y%d", $2, $1 }'
}

session_exists() {
    tmux has-session -t "$1" 2>/dev/null
}

add_window() {
    tmux new-window -d -t "$1:" -n "$2" -c "$3"
}

new_session() {
    cd "$3" &&
    tmux new-session -d -s "$1" -n "$2" $4
}

restore() {
    tmux start-server
    local count=0
    local dimensions="$(terminal_size)"

    while IFS=$'\t' read session_name window_name dir; do
        if [[ -d "$dir" && $window_name != "log" && $window_name != "man" ]]; then
            if session_exists "$session_name"; then
                add_window "$session_name" "$window_name" "$dir"
            else
                new_session "$session_name" "$window_name" "$dir" "$dimensions"
                count=$(( count + 1 ))
            fi
        fi
    done < ~/.tmux-session

    echo "restored $count sessions"
}

case "$1" in
    save | restore )
        $1
        ;;
    * )
        echo "valid commands: save, restore" >&2
        exit 1
esac