use helper functions

plugins/ps/functions

@@ -31,7 +31,7 @@ generate_scale_file() {
     fi
 
     dokku_log_info1_quiet "New DOKKU_SCALE file generated"
-    dokku_log_info1_quiet "$(< $DOKKU_SCALE_FILE)"
+    dokku_log_info2_quiet "$(< $DOKKU_SCALE_FILE)"
   fi
 }
 
@@ -42,6 +42,7 @@ set_scale() {
   for procscale in "${SCALE_SETTINGS[@]}"; do
     PROC_NAME=${procscale%%=*}
     PROC_COUNT=${procscale#*=}
+    is_number $PROC_COUNT || dokku_log_fail "ps:scale $PROC_COUNT is not a number"
     dokku_log_info1_quiet "Scaling $APP:$PROC_NAME to $PROC_COUNT"
     if (egrep -q ^${PROC_NAME}= $DOKKU_SCALE_FILE > /dev/null 2>&1);then
       sed --in-place "s:^${PROC_NAME}=.*:$PROC_NAME=$PROC_COUNT:g" $DOKKU_SCALE_FILE