[libgit2-glib] Bind ggit_commit_get_nth_ancestor

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 7cecf79826983722fba37b2ea91c2de51ac86ac2
Author: Ignacio Casal Quinteiro <icq gnome org>
Date:   Thu Jul 12 20:25:01 2012 +0200

    Bind ggit_commit_get_nth_ancestor

 libgit2-glib/ggit-commit.c |   36 ++++++++++++++++++++++++++++++++++++
 libgit2-glib/ggit-commit.h |   14 +++++++++-----
 2 files changed, 45 insertions(+), 5 deletions(-)
---
diff --git a/libgit2-glib/ggit-commit.c b/libgit2-glib/ggit-commit.c
index 7392532..1237a29 100644
--- a/libgit2-glib/ggit-commit.c
+++ b/libgit2-glib/ggit-commit.c
@@ -20,6 +20,7 @@
 
 #include <git2/errors.h>
 
+#include "ggit-error.h"
 #include "ggit-commit.h"
 #include "ggit-signature.h"
 #include "ggit-oid.h"
@@ -450,4 +451,39 @@ ggit_commit_get_tree_id (GgitCommit *commit)
 	return _ggit_oid_new (oid);
 }
 
+/**
+ * ggit_commit_get_nth_ancestor:
+ * @commit: a #GgitCommit
+ * @n: the requested ancestor
+ * @error: a #GError for error reporting, or %NULL.
+ *
+ * Gets the commit object that is the <n>th generation ancestor
+ * of the named commit object, following only the first parents.
+ * Passing %0 to the @n parameter returns another instance of @commit.
+ *
+ * Returns: (transfer full): the @n ancestor commit.
+ */
+GgitCommit *
+ggit_commit_get_nth_ancestor (GgitCommit  *commit,
+                              guint        n,
+                              GError     **error)
+{
+	git_commit *ancestor;
+	gint ret;
+
+	g_return_val_if_fail (GGIT_IS_COMMIT (commit), NULL);
+	g_return_val_if_fail (n >= 0, NULL);
+	g_return_val_if_fail (error == NULL || *error == NULL, NULL);
+
+	ret = git_commit_nth_gen_ancestor (&ancestor, _ggit_native_get (commit), n);
+
+	if (ret != GIT_OK)
+	{
+		_ggit_error_set (error, ret);
+		return NULL;
+	}
+
+	return _ggit_commit_wrap (ancestor, TRUE);
+}
+
 /* ex:set ts=8 noet: */
diff --git a/libgit2-glib/ggit-commit.h b/libgit2-glib/ggit-commit.h
index 0726841..5947578 100644
--- a/libgit2-glib/ggit-commit.h
+++ b/libgit2-glib/ggit-commit.h
@@ -75,7 +75,7 @@ GgitSignature       *ggit_commit_get_committer        (GgitCommit        *commit
 
 GgitSignature       *ggit_commit_get_author           (GgitCommit        *commit);
 
-GgitCommitParents *  ggit_commit_get_parents          (GgitCommit        *commit);
+GgitCommitParents   *ggit_commit_get_parents          (GgitCommit        *commit);
 
 
 
@@ -84,15 +84,19 @@ void                 ggit_commit_parents_unref        (GgitCommitParents *parent
 
 guint                ggit_commit_parents_size         (GgitCommitParents *parents);
 
-GgitCommit *         ggit_commit_parents_get          (GgitCommitParents *parents,
+GgitCommit          *ggit_commit_parents_get          (GgitCommitParents *parents,
                                                        guint              idx);
 
-GgitOId *            ggit_commit_parents_get_id       (GgitCommitParents *parents,
+GgitOId             *ggit_commit_parents_get_id       (GgitCommitParents *parents,
                                                        guint              idx);
 
-GgitTree *           ggit_commit_get_tree             (GgitCommit        *commit);
+GgitTree            *ggit_commit_get_tree             (GgitCommit        *commit);
 
-GgitOId *            ggit_commit_get_tree_id          (GgitCommit        *commit);
+GgitOId             *ggit_commit_get_tree_id          (GgitCommit        *commit);
+
+GgitCommit          *ggit_commit_get_nth_ancestor     (GgitCommit        *commit,
+                                                       guint              n,
+                                                       GError           **error);
 
 G_END_DECLS