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describe: fix --no-exact-match

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Since 2c33f75754 (Teach git-describe --exact-match to avoid expensive
tag searches, 2008-02-24) git describe accepts --no-exact-match, but it
does the same as --exact-match, an alias for --candidates=0.  That's
because it's defined using OPT_SET_INT with a value of 0, which sets 0
when negated as well.

Let --no-exact-match set the number of candidates to the default value
instead.  Users that need a more specific lack of exactitude can specify
their preferred value using --candidates, as before.

The "--no-exact-match" option was not covered in the tests, so let's
add a few.  Also add a case where --exact-match option is used on a
commit that cannot be described without distance from tags and make
sure the command fails.

Signed-off-by: René Scharfe <l.s.r@web.de>
[jc: added trivial tests]
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe
2023-07-21 15:41:33 +02:00
committed by Junio C Hamano
parent fb7d80edca
commit c95ae3ff9c
2 changed files with 22 additions and 3 deletions
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8
t/t6120-describe.sh
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@ -85,6 +85,7 @@ check_describe e-1-gHASH --tags HEAD^^
check_describe c-2-gHASH --tags HEAD^^2
check_describe B --tags HEAD^^2^
check_describe e --tags HEAD^^^
check_describe e --tags --exact-match HEAD^^^
check_describe heads/main --all HEAD
check_describe tags/c-6-gHASH --all HEAD^
@ -96,6 +97,13 @@ check_describe A-3-gHASH --long HEAD^^2
check_describe c-7-gHASH --tags
check_describe e-3-gHASH --first-parent --tags
check_describe c-7-gHASH --tags --no-exact-match HEAD
check_describe e-3-gHASH --first-parent --tags --no-exact-match HEAD
test_expect_success '--exact-match failure' '
test_must_fail git describe --exact-match HEAD 2>err
'
test_expect_success 'describe --contains defaults to HEAD without commit-ish' '
echo "A^0" >expect &&
git checkout A &&