tree 8e185b5051fe27386ba990d8512cfa4cdceef4aa
parent 81b237d5db946b4196225712a37639952787c959
author Junio C Hamano <gitster@pobox.com> 1217405539 -0700
committer Junio C Hamano <gitster@pobox.com> 1217405606 -0700

Fix merge name generation in "merge in C"

When merging an early part of a branch, e.g. "git merge xyzzy~20", we were
supposed to say "branch 'xyzzy' (early part)", but it incorrectly said
"branch 'refs/heads/xy' (early part)" instead.

The logic was supposed to first strip away "~20" part to make sure that
what follows "~" is a non-zero posint, prefix it with "refs/heads/" and
ask resolve_ref() if it is a ref.  If it is, then we know xyzzy was a
branch, and we can give the correct message.

However, there were a few bugs.  First of all, the logic to build this
"true branch refname" did not count the characters correctly.  At this
point of the code, "len" is the number of trailing, non-name part of the
given extended SHA-1 expression given by the user, i.e. number of bytes in
"~20" in the above example.

In addition, the message forgot to skip "refs/heads/" it prefixed from the
output.

Signed-off-by: Junio C Hamano <gitster@pobox.com>