Merge pull request #132 from cloudbuilders/tmux

add support for tmux if USE_TMUX=yes

stack.sh

@@ -958,12 +958,17 @@ fi
 function screen_it {
     NL=`echo -ne '\015'`
     if [[ "$ENABLED_SERVICES" =~ "$1" ]]; then
-        screen -S stack -X screen -t $1
-        # sleep to allow bash to be ready to be send the command - we are
-        # creating a new window in screen and then sends characters, so if
-        # bash isn't running by the time we send the command, nothing happens
-        sleep 1
-        screen -S stack -p $1 -X stuff "$2$NL"
+        if [[ "$USE_TMUX" =~ "yes" ]]; then
+            tmux new-window -t stack -a -n "$1" "bash"
+            tmux send-keys "$2" C-M
+        else
+            screen -S stack -X screen -t $1
+            # sleep to allow bash to be ready to be send the command - we are
+            # creating a new window in screen and then sends characters, so if
+            # bash isn't running by the time we send the command, nothing happens
+            sleep 1
+            screen -S stack -p $1 -X stuff "$2$NL"
+        fi
     fi
 }