start or attach tmux session on connect

.commonrc

@@ -1,17 +1,8 @@
 
 [[ -f "$HOME/.dotfiles/aliases" ]] && source "$HOME/.dotfiles/aliases"
 
+if [ ! "$TERM_PROGRAM" = "iTerm.app" ]; then
     if [ -z "$TMUX" ]; then
-    base_session='main'
-    # Create a new session if it doesn't exist
-    tmux has-session -t $base_session || tmux new-session -d -s  $base_session
-    # Are there any clients connected already?
-    client_cnt=$(tmux list-clients | wc -l)
-    if [ $client_cnt -ge 1 ]; then
-        session_name=$base_session"-"$client_cnt
-        tmux new-session -d -t $base_session -s $session_name
-        tmux -2 attach-session -t $session_name \; set-option    destroy-unattached
-    else
-        tmux -2 attach-session -t $base_session
+        (tmux ls | grep -vq attached && tmux -2 attach-session -t main) ||  tmux -2 new-session -t main
     fi
 fi