Add processing log info msg

Author: Enrique Fernandez

bag_tools/scripts/plot.py

@@ -427,6 +427,8 @@ def __init__(self, bags, topics, plot_arrays=True, plot_headers=True, plot_forma
             rospy.logwarn("Does NOT support multiple bags yet! Only first bag will be used.")
         bag = self._bags[0]
 
+        rospy.loginfo("Processing %s ..." % bag)
+
         # Retrieve/Expand plottable topic fields:
         plottable_topics = []
         for topic in topics: