[gnome-builder] vcs: allow fetching the current branch name

[Christian Hergert <chergert src gnome org>]

commit dedcab41e4b1be971c2586ac183e179a2b95e93e
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jun 21 18:08:19 2016 -0700

    vcs: allow fetching the current branch name
    
    If you want to watch for changes, connect to ::changed and then call this
    function again.

 libide/vcs/ide-vcs.c      |   18 ++++++++++++++++++
 libide/vcs/ide-vcs.h      |    2 ++
 plugins/git/ide-git-vcs.c |   21 +++++++++++++++++++++
 3 files changed, 41 insertions(+), 0 deletions(-)
---
diff --git a/libide/vcs/ide-vcs.c b/libide/vcs/ide-vcs.c
index 115b6cb..f2033a1 100644
--- a/libide/vcs/ide-vcs.c
+++ b/libide/vcs/ide-vcs.c
@@ -208,3 +208,21 @@ ide_vcs_get_config (IdeVcs *self)
 
   return  ret;
 }
+
+/**
+ * ide_vcs_get_branch_name:
+ *
+ * Retrieves the name of the branch in the current working directory.
+ *
+ * Returns: (transfer full): A string containing the branch name.
+ */
+gchar *
+ide_vcs_get_branch_name (IdeVcs *self)
+{
+  g_return_val_if_fail (IDE_IS_VCS (self), NULL);
+
+  if (IDE_VCS_GET_IFACE (self)->get_branch_name)
+    return IDE_VCS_GET_IFACE (self)->get_branch_name (self);
+
+  return g_strdup ("primary");
+}
diff --git a/libide/vcs/ide-vcs.h b/libide/vcs/ide-vcs.h
index 3b76850..dd3654b 100644
--- a/libide/vcs/ide-vcs.h
+++ b/libide/vcs/ide-vcs.h
@@ -43,6 +43,7 @@ struct _IdeVcsInterface
   gint                    (*get_priority)              (IdeVcs     *self);
   void                    (*changed)                   (IdeVcs     *self);
   IdeVcsConfig           *(*get_config)                (IdeVcs     *self);
+  gchar                  *(*get_branch_name)           (IdeVcs     *self);
 };
 
 IdeBufferChangeMonitor *ide_vcs_get_buffer_change_monitor (IdeVcs               *self,
@@ -61,6 +62,7 @@ gboolean                ide_vcs_is_ignored                (IdeVcs
 gint                    ide_vcs_get_priority              (IdeVcs               *self);
 void                    ide_vcs_emit_changed              (IdeVcs               *self);
 IdeVcsConfig           *ide_vcs_get_config                (IdeVcs               *self);
+gchar                  *ide_vcs_get_branch_name           (IdeVcs               *self);
 
 G_END_DECLS
 
diff --git a/plugins/git/ide-git-vcs.c b/plugins/git/ide-git-vcs.c
index 0b2d4bb..1548c0f 100644
--- a/plugins/git/ide-git-vcs.c
+++ b/plugins/git/ide-git-vcs.c
@@ -346,6 +346,26 @@ ide_git_vcs_is_ignored (IdeVcs  *vcs,
   return ret;
 }
 
+static gchar *
+ide_git_vcs_get_branch_name (IdeVcs *vcs)
+{
+  IdeGitVcs *self = (IdeGitVcs *)vcs;
+  GgitRef *ref;
+  gchar *ret = NULL;
+
+  g_assert (IDE_IS_GIT_VCS (self));
+
+  ref = ggit_repository_get_head (self->repository, NULL);
+
+  if (ref != NULL)
+    {
+      ret = g_strdup (ggit_ref_get_shorthand (ref));
+      g_object_unref (ref);
+    }
+
+  return ret;
+}
+
 static void
 ide_git_vcs_dispose (GObject *object)
 {
@@ -401,6 +421,7 @@ ide_git_vcs_init_iface (IdeVcsInterface *iface)
   iface->get_buffer_change_monitor = ide_git_vcs_get_buffer_change_monitor;
   iface->is_ignored = ide_git_vcs_is_ignored;
   iface->get_config = ide_git_vcs_get_config;
+  iface->get_branch_name = ide_git_vcs_get_branch_name;
 }
 
 static void