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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 "common.h"

#include "revwalk.h"

#include "merge.h"

#include "git2/graph.h"

static int interesting(git_pqueue *list, git_commit_list *roots)

{

unsigned int i;

for (i = 0; i < git_pqueue_size(list); i++) {

git_commit_list_node *commit = git_pqueue_get(list, 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, 0, 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 = git_pqueue_pop(&list);

unsigned int flags;

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 error = 0, i;

*ahead = 0;

*behind = 0;

if (git_pqueue_init(&pq, 0, 2, git_commit_list_time_cmp) < 0)

return -1;

if ((error = git_pqueue_insert(&pq, one)) < 0 ||

(error = git_pqueue_insert(&pq, two)) < 0)

goto done;

while ((commit = git_pqueue_pop(&pq)) != NULL) {

if (commit->flags & RESULT ||

(commit->flags & (PARENT1 | PARENT2)) == (PARENT1 | PARENT2))

continue;

else if (commit->flags & PARENT1)

(*ahead)++;

else if (commit->flags & PARENT2)

(*behind)++;

for (i = 0; i < commit->out_degree; i++) {

git_commit_list_node *p = commit->parents[i];

if ((error = git_pqueue_insert(&pq, p)) < 0)

goto done;

}

commit->flags |= RESULT;

}

done:

git_pqueue_free(&pq);

return error;

}

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;

}

int git_graph_descendant_of(git_repository *repo, const git_oid *commit, const git_oid *ancestor)

{

git_oid merge_base;

int error;

if (git_oid_equal(commit, ancestor))

return 0;

error = git_merge_base(&merge_base, repo, commit, ancestor);

/* No merge-base found, it's not a descendant */

if (error == GIT_ENOTFOUND)

return 0;

if (error < 0)

return error;

return git_oid_equal(&merge_base, ancestor);

}