update tmux script to start in opened tmux session

bash_scripts/tmux_start.sh

@@ -1,3 +1,15 @@
 #!/bin/bash
 
-tmux new -s dev \; splitw -h \; selectp -t 0 \; resizep -x 83 \; splitw -v -l 15 \; selectp -t 0 \;
+# if called from a tmux session, don't create new session
+if [ -n "$TMUX_PANE" ]; then
+	tmux rename-window dev
+	tmux splitw -h
+	tmux selectp -t 0
+	tmux resizep -x 83
+	tmux splitw -v -l 15
+	tmux selectp -t 0
+	clear
+else
+	tmux new -s dev \; rename-window dev \; splitw -h \; selectp -t 0 \; resizep -x 83 \; splitw -v -l 15 \; selectp -t 0 \;
+fi
+