[gnome-builder/document-manager] GbDocumentManager: add find_with_type() helper

[Christian Hergert <chergert src gnome org>]

commit 80f4a72a3e4fa610aeca7338e2da05ac642dc2ff
Author: Christian Hergert <christian hergert me>
Date:   Tue Dec 9 16:38:01 2014 -0800

    GbDocumentManager: add find_with_type() helper
    
    This will return the first document matching a given type. Convenient
    if you have a singleton type document.

 src/documents/gb-document-manager.c |   22 ++++++++++++++++++++++
 src/documents/gb-document-manager.h |    2 ++
 2 files changed, 24 insertions(+), 0 deletions(-)
---
diff --git a/src/documents/gb-document-manager.c b/src/documents/gb-document-manager.c
index 09fb25d..0bf71ed 100644
--- a/src/documents/gb-document-manager.c
+++ b/src/documents/gb-document-manager.c
@@ -74,6 +74,28 @@ gb_document_manager_get_count (GbDocumentManager *manager)
 }
 
 GbDocument *
+gb_document_manager_find_with_type (GbDocumentManager *manager,
+                                    GType              type)
+{
+  guint i;
+
+  g_return_val_if_fail (GB_IS_DOCUMENT_MANAGER (manager), NULL);
+  g_return_val_if_fail (g_type_is_a (type, GB_TYPE_DOCUMENT), NULL);
+
+  for (i = 0; i < manager->priv->documents->len; i++)
+    {
+      GbDocument *document;
+
+      document = g_ptr_array_index (manager->priv->documents, i);
+
+      if (g_type_is_a (G_TYPE_FROM_INSTANCE (document), type))
+        return document;
+    }
+
+  return NULL;
+}
+
+GbDocument *
 gb_document_manager_find_with_file (GbDocumentManager *manager,
                                     GFile             *file)
 {
diff --git a/src/documents/gb-document-manager.h b/src/documents/gb-document-manager.h
index 6c01fde..b31d506 100644
--- a/src/documents/gb-document-manager.h
+++ b/src/documents/gb-document-manager.h
@@ -68,6 +68,8 @@ GList             *gb_document_manager_get_documents  (GbDocumentManager *manage
 guint              gb_document_manager_get_count      (GbDocumentManager *manager);
 GbDocument        *gb_document_manager_find_with_file (GbDocumentManager *manager,
                                                        GFile             *file);
+GbDocument        *gb_document_manager_find_with_type (GbDocumentManager *manager,
+                                                       GType              type);
 
 G_END_DECLS