return new_list;
}
+unsigned commit_list_count(const struct commit_list *l)
+{
+ unsigned c = 0;
+ for (; l; l = l->next )
+ c++;
+ return c;
+}
+
void free_commit_list(struct commit_list *list)
{
while (list) {
return NULL;
}
-static struct commit_list *merge_bases(struct commit *one, struct commit *two)
+static struct commit_list *merge_bases_many(struct commit *one, int n, struct commit **twos)
{
struct commit_list *list = NULL;
struct commit_list *result = NULL;
+ int i;
- if (one == two)
- /* We do not mark this even with RESULT so we do not
- * have to clean it up.
- */
- return commit_list_insert(one, &result);
+ for (i = 0; i < n; i++) {
+ if (one == twos[i])
+ /*
+ * We do not mark this even with RESULT so we do not
+ * have to clean it up.
+ */
+ return commit_list_insert(one, &result);
+ }
if (parse_commit(one))
return NULL;
- if (parse_commit(two))
- return NULL;
+ for (i = 0; i < n; i++) {
+ if (parse_commit(twos[i]))
+ return NULL;
+ }
one->object.flags |= PARENT1;
- two->object.flags |= PARENT2;
insert_by_date(one, &list);
- insert_by_date(two, &list);
+ for (i = 0; i < n; i++) {
+ twos[i]->object.flags |= PARENT2;
+ insert_by_date(twos[i], &list);
+ }
while (interesting(list)) {
struct commit *commit;
return result;
}
-struct commit_list *get_merge_bases(struct commit *one,
- struct commit *two, int cleanup)
+struct commit_list *get_octopus_merge_bases(struct commit_list *in)
+{
+ struct commit_list *i, *j, *k, *ret = NULL;
+ struct commit_list **pptr = &ret;
+
+ for (i = in; i; i = i->next) {
+ if (!ret)
+ pptr = &commit_list_insert(i->item, pptr)->next;
+ else {
+ struct commit_list *new = NULL, *end = NULL;
+
+ for (j = ret; j; j = j->next) {
+ struct commit_list *bases;
+ bases = get_merge_bases(i->item, j->item, 1);
+ if (!new)
+ new = bases;
+ else
+ end->next = bases;
+ for (k = bases; k; k = k->next)
+ end = k;
+ }
+ ret = new;
+ }
+ }
+ return ret;
+}
+
+struct commit_list *get_merge_bases_many(struct commit *one,
+ int n,
+ struct commit **twos,
+ int cleanup)
{
struct commit_list *list;
struct commit **rslt;
struct commit_list *result;
int cnt, i, j;
- result = merge_bases(one, two);
- if (one == two)
- return result;
+ result = merge_bases_many(one, n, twos);
+ for (i = 0; i < n; i++) {
+ if (one == twos[i])
+ return result;
+ }
if (!result || !result->next) {
if (cleanup) {
clear_commit_marks(one, all_flags);
- clear_commit_marks(two, all_flags);
+ for (i = 0; i < n; i++)
+ clear_commit_marks(twos[i], all_flags);
}
return result;
}
free_commit_list(result);
clear_commit_marks(one, all_flags);
- clear_commit_marks(two, all_flags);
+ for (i = 0; i < n; i++)
+ clear_commit_marks(twos[i], all_flags);
for (i = 0; i < cnt - 1; i++) {
for (j = i+1; j < cnt; j++) {
if (!rslt[i] || !rslt[j])
continue;
- result = merge_bases(rslt[i], rslt[j]);
+ result = merge_bases_many(rslt[i], 1, &rslt[j]);
clear_commit_marks(rslt[i], all_flags);
clear_commit_marks(rslt[j], all_flags);
for (list = result; list; list = list->next) {
return result;
}
+struct commit_list *get_merge_bases(struct commit *one, struct commit *two,
+ int cleanup)
+{
+ return get_merge_bases_many(one, 1, &two, cleanup);
+}
+
int in_merge_bases(struct commit *commit, struct commit **reference, int num)
{
struct commit_list *bases, *b;
free_commit_list(bases);
return ret;
}
+
+struct commit_list *reduce_heads(struct commit_list *heads)
+{
+ struct commit_list *p;
+ struct commit_list *result = NULL, **tail = &result;
+ struct commit **other;
+ size_t num_head, num_other;
+
+ if (!heads)
+ return NULL;
+
+ /* Avoid unnecessary reallocations */
+ for (p = heads, num_head = 0; p; p = p->next)
+ num_head++;
+ other = xcalloc(sizeof(*other), num_head);
+
+ /* For each commit, see if it can be reached by others */
+ for (p = heads; p; p = p->next) {
+ struct commit_list *q, *base;
+
+ /* Do we already have this in the result? */
+ for (q = result; q; q = q->next)
+ if (p->item == q->item)
+ break;
+ if (q)
+ continue;
+
+ num_other = 0;
+ for (q = heads; q; q = q->next) {
+ if (p->item == q->item)
+ continue;
+ other[num_other++] = q->item;
+ }
+ if (num_other)
+ base = get_merge_bases_many(p->item, num_other, other, 1);
+ else
+ base = NULL;
+ /*
+ * If p->item does not have anything common with other
+ * commits, there won't be any merge base. If it is
+ * reachable from some of the others, p->item will be
+ * the merge base. If its history is connected with
+ * others, but p->item is not reachable by others, we
+ * will get something other than p->item back.
+ */
+ if (!base || (base->item != p->item))
+ tail = &(commit_list_insert(p->item, tail)->next);
+ free_commit_list(base);
+ }
+ free(other);
+ return result;
+}