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strbuf_branchname(): do not double-expand @{-1}~22

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If you were on 'frotz' branch before you checked out your current
branch, "git merge @{-1}~22" means the same as "git merge frotz~22".

The strbuf_branchname() function, when interpret_branch_name() gives
up resolving "@{-1}~22" fully, returns "frotz" and tells the caller
that it only resolved "@{-1}" part of the input, mistakes this as a
total failure, and appends the whole thing to the result, yielding
"frotz@{-1}~22", which does not make any sense.

Inspect the return value from interpret_branch_name() a bit more
carefully.  When it errored out without consuming anything, we will
get -1 and we should return the whole thing.  Otherwise, we should
append the remainder (i.e. "~22" in the earlier example) to the
partially resolved name (i.e. "frotz").

The test suite adds enough number of checkout to make @{-12} in the
last test in t0100 that tried to check "we haven't flipped branches
that many times" error case succeed; raise the number to a hundred.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2013-05-15 14:32:30 -07:00
parent 6a3ac18ba3
commit 84cf246670
2 changed files with 19 additions and 4 deletions
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8
sha1_name.c
View File

@ -1055,9 +1055,13 @@ int interpret_branch_name(const char *name, struct strbuf *buf)
int strbuf_branchname(struct strbuf *sb, const char *name)
{
int len = strlen(name);
if (interpret_branch_name(name, sb) == len)
int used = interpret_branch_name(name, sb);
if (used == len)
return 0;
strbuf_add(sb, name, len);
if (used < 0)
used = 0;
strbuf_add(sb, name + used, len - used);
return len;
}

15
t/t0100-previous.sh
View File

@ -27,6 +27,7 @@ test_expect_success 'merge @{-1}' '
test_commit B &&
git checkout A &&
test_commit C &&
test_commit D &&
git branch -f master B &&
git branch -f other &&
git checkout other &&
@ -35,14 +36,24 @@ test_expect_success 'merge @{-1}' '
git cat-file commit HEAD | grep "Merge branch '\''other'\''"
'
test_expect_success 'merge @{-1} when there is not enough switches yet' '
test_expect_success 'merge @{-1}~1' '
git checkout master &&
git reset --hard B &&
git checkout other &&
git checkout master &&
git merge @{-1}~1 &&
git cat-file commit HEAD >actual &&
grep "Merge branch '\''other'\''" actual
'
test_expect_success 'merge @{-100} before checking out that many branches yet' '
git reflog expire --expire=now &&
git checkout -f master &&
git reset --hard B &&
git branch -f other C &&
git checkout other &&
git checkout master &&
test_must_fail git merge @{-12}
test_must_fail git merge @{-100}
'
test_done