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diff-lib: define diff_get_merge_base()

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In a future commit, we will be using this function to implement
--merge-base functionality in various diff commands.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Denton Liu 2020-09-20 04:22:23 -07:00 committed by Junio C Hamano
parent 4c3fe82ef1
commit 177a830268
2 changed files with 47 additions and 0 deletions
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45
diff-lib.c
View File

@ -13,6 +13,7 @@
#include "submodule.h"
#include "dir.h"
#include "fsmonitor.h"
#include "commit-reach.h"
/*
* diff-files
@ -512,6 +513,50 @@ static int diff_cache(struct rev_info *revs,
return unpack_trees(1, &t, &opts);
}
void diff_get_merge_base(const struct rev_info *revs, struct object_id *mb)
{
int i;
struct commit *mb_child[2] = {0};
struct commit_list *merge_bases;
for (i = 0; i < revs->pending.nr; i++) {
struct object *obj = revs->pending.objects[i].item;
if (obj->flags)
die(_("--merge-base does not work with ranges"));
if (obj->type != OBJ_COMMIT)
die(_("--merge-base only works with commits"));
}
/*
* This check must go after the for loop above because A...B
* ranges produce three pending commits, resulting in a
* misleading error message.
*/
if (revs->pending.nr < 1 || revs->pending.nr > 2)
BUG("unexpected revs->pending.nr: %d", revs->pending.nr);
for (i = 0; i < revs->pending.nr; i++)
mb_child[i] = lookup_commit_reference(the_repository, &revs->pending.objects[i].item->oid);
if (revs->pending.nr == 1) {
struct object_id oid;
if (get_oid("HEAD", &oid))
die(_("unable to get HEAD"));
mb_child[1] = lookup_commit_reference(the_repository, &oid);
}
merge_bases = repo_get_merge_bases(the_repository, mb_child[0], mb_child[1]);
if (!merge_bases)
die(_("no merge base found"));
if (merge_bases->next)
die(_("multiple merge bases found"));
oidcpy(mb, &merge_bases->item->object.oid);
free_commit_list(merge_bases);
}
int run_diff_index(struct rev_info *revs, unsigned int option)
{
struct object_array_entry *ent;

2
diff.h
View File

@ -580,6 +580,8 @@ void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc);
*/
const char *diff_aligned_abbrev(const struct object_id *sha1, int);
void diff_get_merge_base(const struct rev_info *revs, struct object_id *mb);
/* do not report anything on removed paths */
#define DIFF_SILENT_ON_REMOVED 01
/* report racily-clean paths as modified */