There were two bugs in there:
- if the range didn't end up working, we restored the '.' character in
the wrong place.
- an empty end-of-range should be interpreted as HEAD.
See rev-parse.c for the reference implementation of this.
Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>