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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "revwalk.h"
#include "merge.h"
#include "git2/graph.h"
static int interesting(git_pqueue *list, git_commit_list *roots)
{
unsigned int i;
/* element 0 isn't used - we need to start at 1 */
for (i = 1; i < list->size; i++) {
git_commit_list_node *commit = list->d[i];
if ((commit->flags & STALE) == 0)
return 1;
}
while(roots) {
if ((roots->item->flags & STALE) == 0)
return 1;
roots = roots->next;
}
return 0;
}
static int mark_parents(git_revwalk *walk, git_commit_list_node *one,
git_commit_list_node *two)
{
unsigned int i;
git_commit_list *roots = NULL;
git_pqueue list;
/* if the commit is repeated, we have a our merge base already */
if (one == two) {
one->flags |= PARENT1 | PARENT2 | RESULT;
return 0;
}
if (git_pqueue_init(&list, 2, git_commit_list_time_cmp) < 0)
return -1;
if (git_commit_list_parse(walk, one) < 0)
goto on_error;
one->flags |= PARENT1;
if (git_pqueue_insert(&list, one) < 0)
goto on_error;
if (git_commit_list_parse(walk, two) < 0)
goto on_error;
two->flags |= PARENT2;
if (git_pqueue_insert(&list, two) < 0)
goto on_error;
/* as long as there are non-STALE commits */
while (interesting(&list, roots)) {
git_commit_list_node *commit;
int flags;
commit = git_pqueue_pop(&list);
if (commit == NULL)
break;
flags = commit->flags & (PARENT1 | PARENT2 | STALE);
if (flags == (PARENT1 | PARENT2)) {
if (!(commit->flags & RESULT))
commit->flags |= RESULT;
/* we mark the parents of a merge stale */
flags |= STALE;
}
for (i = 0; i < commit->out_degree; i++) {
git_commit_list_node *p = commit->parents[i];
if ((p->flags & flags) == flags)
continue;
if (git_commit_list_parse(walk, p) < 0)
goto on_error;
p->flags |= flags;
if (git_pqueue_insert(&list, p) < 0)
goto on_error;
}
/* Keep track of root commits, to make sure the path gets marked */
if (commit->out_degree == 0) {
if (git_commit_list_insert(commit, &roots) == NULL)
goto on_error;
}
}
git_commit_list_free(&roots);
git_pqueue_free(&list);
return 0;
on_error:
git_commit_list_free(&roots);
git_pqueue_free(&list);
return -1;
}
static int ahead_behind(git_commit_list_node *one, git_commit_list_node *two,
size_t *ahead, size_t *behind)
{
git_commit_list_node *commit;
git_pqueue pq;
int i;
*ahead = 0;
*behind = 0;
if (git_pqueue_init(&pq, 2, git_commit_list_time_cmp) < 0)
return -1;
if (git_pqueue_insert(&pq, one) < 0)
goto on_error;
if (git_pqueue_insert(&pq, two) < 0)
goto on_error;
while ((commit = git_pqueue_pop(&pq)) != NULL) {
if (commit->flags & RESULT ||
(commit->flags & (PARENT1 | PARENT2)) == (PARENT1 | PARENT2))
continue;
else if (commit->flags & PARENT1)
(*behind)++;
else if (commit->flags & PARENT2)
(*ahead)++;
for (i = 0; i < commit->out_degree; i++) {
git_commit_list_node *p = commit->parents[i];
if (git_pqueue_insert(&pq, p) < 0)
return -1;
}
commit->flags |= RESULT;
}
git_pqueue_free(&pq);
return 0;
on_error:
git_pqueue_free(&pq);
return -1;
}
int git_graph_ahead_behind(size_t *ahead, size_t *behind, git_repository *repo,
const git_oid *local, const git_oid *upstream)
{
git_revwalk *walk;
git_commit_list_node *commit_u, *commit_l;
if (git_revwalk_new(&walk, repo) < 0)
return -1;
commit_u = git_revwalk__commit_lookup(walk, upstream);
if (commit_u == NULL)
goto on_error;
commit_l = git_revwalk__commit_lookup(walk, local);
if (commit_l == NULL)
goto on_error;
if (mark_parents(walk, commit_l, commit_u) < 0)
goto on_error;
if (ahead_behind(commit_l, commit_u, ahead, behind) < 0)
goto on_error;
git_revwalk_free(walk);
return 0;
on_error:
git_revwalk_free(walk);
return -1;
}
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