[mythtv] Guide to write a plugin?

[Henrik Gammelmark]

I have looked around on mythtv.org, but I cannot seem to find any 
documentation / howtos / turorials / faqs on how to build a simple 
plugin for MythTV.

Does anyone know of any such guide or at least some sort of 
documentation to use? For starters I wish to create simple Hello World 
plugin that appears in the main menu, and responds to a keystroke (or 
lirc key) by doing something useless.

In #mythtv @ Freenode, I was told that there is no such guide or sample 
plugin, and the best way to go about it, is study an existing plugin. So 
I started taking apart mythweather, but I quickly got stuck.

Any pointers would be helpful - what is the bare minimum of code 
required to accomplish the above task, and also, what is the build 
procedure? I never used qmake before, and I'm not sure I understand what 
it does.

Thank you very much in advance

/ Henrik