Buffer: modification tracking

1 files changed, 12 insertions, 1 deletions

diff --git a/src/buffer.cc b/src/buffer.cc
index d59977fe..2ee56106 100644
--- a/src/buffer.cc
+++ b/src/buffer.cc
@@ -138,7 +138,7 @@ bool BufferIterator::is_end() const
 
 Buffer::Buffer(const std::string& name, const BufferString& initial_content)
     : m_name(name), m_history(1), m_history_cursor(m_history.begin()),
-      m_content(initial_content)
+      m_content(initial_content), m_last_save_undo_group(m_history.begin())
 {
     BufferManager::instance().register_buffer(this);
 
@@ -350,4 +350,15 @@ void Buffer::delete_window(Window* window)
     m_windows.erase(window_it);
 }
 
+bool Buffer::is_modified() const
+{
+    return m_last_save_undo_group != m_history_cursor
+           or not m_current_undo_group.empty();
+}
+
+void Buffer::notify_saved()
+{
+    m_last_save_undo_group = m_history_cursor;
+}
+
 }