Function simplify_one

revision.c:3510–3620

}

static struct commit_list **simplify_one(struct rev_info *revs, struct commit *commit, struct commit_list **tail)
{
	struct commit_list *p;
	struct commit *parent;
	struct merge_simplify_state *st, *pst;
	int cnt;

	st = locate_simplify_state(revs, commit);

	/*
	 * Have we handled this one?
	 */
	if (st->simplified)
		return tail;

	/*
	 * An UNINTERESTING commit simplifies to itself, so does a
	 * root commit.  We do not rewrite parents of such commit
	 * anyway.
	 */
	if ((commit->object.flags & UNINTERESTING) || !commit->parents) {
		st->simplified = commit;
		return tail;
	}

	/*
	 * Do we know what commit all of our parents that matter
	 * should be rewritten to?  Otherwise we are not ready to
	 * rewrite this one yet.
	 */
	for (cnt = 0, p = commit->parents; p; p = p->next) {
		pst = locate_simplify_state(revs, p->item);
		if (!pst->simplified) {
			tail = &commit_list_insert(p->item, tail)->next;
			cnt++;
		}
		if (revs->first_parent_only)
			break;
	}
	if (cnt) {
		tail = &commit_list_insert(commit, tail)->next;
		return tail;
	}

	/*
	 * Rewrite our list of parents. Note that this cannot
	 * affect our TREESAME flags in any way - a commit is
	 * always TREESAME to its simplification.
	 */
	for (p = commit->parents; p; p = p->next) {
		pst = locate_simplify_state(revs, p->item);
		p->item = pst->simplified;
		if (revs->first_parent_only)
			break;
	}

	if (revs->first_parent_only)
		cnt = 1;