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merge: introduce {copy|clear}_merge_options()

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When mostly the same set of options are to be used to perform
multiple merges, one instance of the merge_options structure may
want to be created and used by copying from the same template
instance.  We saw such a use recently in "git merge-tree".

Let's make the pattern official by introducing copy_merge_options()
as a supported way to make a copy of the structure, and also give
clear_merge_options() to release any resources held by a copied
instance.  Currently we only make a shallow copy, so the former is a
mere structure assignment while the latter is a no-op, but this may
change in the future as the members of merge_options structure
evolve.

Suggested-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
2023-10-11 13:37:47 -07:00
parent 6a4c9e7b32
commit b182658e3e
3 changed files with 22 additions and 1 deletions
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4
builtin/merge-tree.c
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@ -425,10 +425,11 @@ static int real_merge(struct merge_tree_options *o,
{
struct commit *parent1, *parent2;
struct commit_list *merge_bases = NULL;
struct merge_options opt = o->merge_options;
struct merge_result result = { 0 };
int show_messages = o->show_messages;
struct merge_options opt;
copy_merge_options(&opt, &o->merge_options);
parent1 = get_merge_parent(branch1);
if (!parent1)
help_unknown_ref(branch1, "merge-tree",
@ -507,6 +508,7 @@ static int real_merge(struct merge_tree_options *o,
if (o->use_stdin)
putchar(line_termination);
merge_finalize(&opt, &result);
clear_merge_options(&opt);
return !result.clean; /* result.clean < 0 handled above */
}