for your log system, that would be really easy.
simply create a text file and let WME write your strings into the text file. If you want to see you log ingame, just read the text file with WME and let them draw on your screen. It should not be very hard. The biggest problem will be scrolling the log but you can just use a modified version of WMEs save and load menu script.
for a text parser: There are books and papers out there how to write and design a text parser. Its not hard but requires some knowledge of programming but your biggest concern will be to have a parser that have enough power to answer your questions and here the real work starts.
You could research a little bit about chat bots and how they are organized. Maybe you also can find some free interpreter and hook it with wintermute per dll.
http://www.alicebot.org/aiml.html for example is famous for its good results and easy to learn chat database organization.
But personally i would stay away from something if its just a gimmick and not gameplay relevant. There is some reason why today no one uses chat-bots in games and game companies like Bethesta, BioWare and Obsidian still use more or less traditional dialog systems.