Tmux POC - detach-client going wonky

tmux.poc.sh

#!/bin/bash
SESSION=tmuxtest
tmux_new_or_attach()
{
    local session=$1

    tmux has-session -t "$session" > /dev/null 2>&1
    should_attach=$?

    if [[ "$should_attach" == 0 ]] ; then
        tmux attach-session -t "$session"
        echo "attached"
    else
        tmux -f ~/.tmux.conf new-session -d -s "$session"
        echo "new using $config"
    fi
}
tmux_run_attach()
{
    local session=$1
    tmux attach-session -t "$session"
}
select_window()
{
    local session=$1
    tmux select-window -t "$session:0"
}
window0()
{
    local session=$1
    local win=0
    local name="HTOP"
    local htopCmd="htop"

    echo "Creating window $win"
    tmux rename-window -t "$session:${win}" "$name"

    echo "Sending keys to window $win"
    tmux send-keys -t "$session:${win}.0" "$htopCmd" C-m
}
window1()
{
    local session=$1
    local win=1
    local name="ANOTHER-WIN"

    echo "Creating window $win"
    tmux new-window -n "$name"

    echo "Sending keys to window $win"
    tmux send-keys -t "$session:${win}.0" "ls -la" C-m
}
main()
{
    tmux_new_or_attach $SESSION $CONFIG
    window0 $SESSION
    window1 $SESSION
    select_window $SESSION
    tmux_run_attach $SESSION
}
main