How different is OpenTTD's current source to its original?

[MHTransport]

I'm not to familiar with subversion.

I was wondering if there was a way to determine the number of unchanged source lines from the orginal still in the main version.

It would be a measure of how different (in lowest level terms) OpenTTD is from its original release. (And thus from TTDLX).

[orudge]

I did a diff a while ago based upon the then-latest source and the earliest (~March 2003 - not 2004) code I had from Ludde. It was a pretty big diff file.

[Prof. Frink]

I imagine when the maprewrite is finished, it'll get even huger