Function builtin_diff_tree

builtin/diff.c:173–209

}

static void builtin_diff_tree(struct rev_info *revs,
			      int argc, const char **argv,
			      struct object_array_entry *ent0,
			      struct object_array_entry *ent1)
{
	const struct object_id *(oid[2]);
	struct object_id mb_oid;
	int merge_base = 0;

	while (1 < argc) {
		const char *arg = argv[1];
		if (!strcmp(arg, "--merge-base"))
			merge_base = 1;
		else
			usage(builtin_diff_usage);
		argv++; argc--;
	}

	if (merge_base) {
		diff_get_merge_base(revs, &mb_oid);
		oid[0] = &mb_oid;
		oid[1] = &revs->pending.objects[1].item->oid;
	} else {
		int swap = 0;

		/*
		 * We saw two trees, ent0 and ent1.  If ent1 is uninteresting,
		 * swap them.
		 */
		if (ent1->item->flags & UNINTERESTING)
			swap = 1;
		oid[swap] = &ent0->item->oid;
		oid[1 - swap] = &ent1->item->oid;
	}
	diff_tree_oid(oid[0], oid[1], "", &revs->diffopt);
	log_tree_diff_flush(revs);
}

static void builtin_diff_combined(struct rev_info *revs,
				  int argc, const char **argv UNUSED,