I once tried to develop a mapper for the discworld mud but sadly discworld doesn't have unique room names or even unique room features that could be used to identify a room.
This means that while I got it to work some of the time as soon as you came across a room that was the same as a previously found room it would glitch.
If you want to just move the current map from the output to a miniwindow check out this plugin that does that and more: http://discworld.imaginary-realities.com/garrion/sidebar.html
I wrote it a while ago now and know that someone else has been developing it further recently with more shiny features.
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