From f41ff25a59a385de1e0edb2a5335bdaf08f47d1b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carlos=20Mart=C3=ADn=20Nieto?= <cmn@dwim.me>
Date: Mon, 1 Apr 2013 15:08:05 +0200
Subject: [PATCH] Expose git_libgit2_version

---
 c_src/geef.c    |  2 ++
 c_src/library.c | 11 +++++++++++
 c_src/library.h |  6 ++++++
 src/geef.erl    |  7 +++++++
 4 files changed, 26 insertions(+)
 create mode 100644 c_src/library.c
 create mode 100644 c_src/library.h

diff --git a/c_src/geef.c b/c_src/geef.c
index c55e49f..873f7f6 100644
--- a/c_src/geef.c
+++ b/c_src/geef.c
@@ -6,6 +6,7 @@
 #include "commit.h"
 #include "tree.h"
 #include "blob.h"
+#include "library.h"
 #include "geef.h"
 #include <stdio.h>
 #include <string.h>
@@ -112,6 +113,7 @@ static ErlNifFunc geef_funcs[] =
 	{"tree_bypath", 2, geef_tree_bypath},
 	{"blob_size", 1, geef_blob_size},
 	{"blob_content", 1, geef_blob_content},
+	{"library_version", 0, geef_library_version},
 };
 
 ERL_NIF_INIT(geef, geef_funcs, load, NULL, upgrade, unload)
diff --git a/c_src/library.c b/c_src/library.c
new file mode 100644
index 0000000..ea18bf0
--- /dev/null
+++ b/c_src/library.c
@@ -0,0 +1,11 @@
+#include "erl_nif.h"
+#include <git2.h>
+
+ERL_NIF_TERM geef_library_version(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
+{
+	int major, minor, rev;
+
+	git_libgit2_version(&major, &minor, &rev);
+
+	return enif_make_tuple3(env, enif_make_int(env, major), enif_make_int(env, minor), enif_make_int(env, rev));
+}
diff --git a/c_src/library.h b/c_src/library.h
new file mode 100644
index 0000000..06cf0eb
--- /dev/null
+++ b/c_src/library.h
@@ -0,0 +1,6 @@
+#ifndef GEEF_LIBRARY_H
+#define GEEF_LIBRARY_H
+
+ERL_NIF_TERM geef_library_version(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
+
+#endif
diff --git a/src/geef.erl b/src/geef.erl
index 60f0261..5596ae9 100644
--- a/src/geef.erl
+++ b/src/geef.erl
@@ -16,6 +16,9 @@
 % objects
 -export([object_lookup/2, object_id/1, commit_tree_id/1, commit_tree/1, tree_bypath/2, blob_size/1, blob_content/1]).
 
+% git_libgit2
+-export([library_version/0]).
+
 -on_load(load_enif/0).
 
 hex_to_raw(_Val) ->
@@ -108,6 +111,10 @@ blob_size(_ObjHandle) ->
 blob_content(_ObjHandle) ->
     nif_error(?LINE).
 
+-spec library_version() -> {integer, integer, integer}.
+library_version() ->
+    nif_error(?LINE).
+
 nif_error(Line) ->
     erlang:nif_error({nif_not_loaded,module,?MODULE,line,Line}).