Fix up diffcore-rename scoring
commit90bd932c811f4ecd1d8cbceffdf6a69a5ca838b7
authorLinus Torvalds <torvalds@osdl.org>
Mon, 13 Mar 2006 06:26:34 +0000 (12 22:26 -0800)
committerJunio C Hamano <junkio@cox.net>
Mon, 13 Mar 2006 07:02:00 +0000 (12 23:02 -0800)
treee216ba53a838787fa7931a23a0b335cb709aaba1
parentfc66d213f8b2f13b9ffd643f01de25ddc95e0972
Fix up diffcore-rename scoring

The "score" calculation for diffcore-rename was totally broken.

It scaled "score" as

score = src_copied * MAX_SCORE / dst->size;

which means that you got a 100% similarity score even if src and dest were
different, if just every byte of dst was copied from src, even if source
was much larger than dst (eg we had copied 85% of the bytes, but _deleted_
the remaining 15%).

That's clearly bogus. We should do the score calculation relative not to
the destination size, but to the max size of the two.

This seems to fix it.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
diffcore-rename.c