Add a BufferManager singleton class, handling buffer lifetime

it also provide access to buffers by name

1 files changed, 60 insertions, 0 deletions

diff --git a/src/buffer_manager.cc b/src/buffer_manager.cc
new file mode 100644
index 00000000..9d4cd506
--- /dev/null
+++ b/src/buffer_manager.cc
@@ -0,0 +1,60 @@
+#include "buffer_manager.hh"
+
+#include "buffer.hh"
+#include "window.hh"
+#include <cassert>
+
+namespace Kakoune
+{
+
+struct name_not_unique {};
+
+
+BufferManager* BufferManager::ms_instance = nullptr;
+
+BufferManager& BufferManager::instance()
+{
+    if (not ms_instance)
+        ms_instance = new BufferManager();
+
+    return *ms_instance;
+}
+
+void BufferManager::delete_instance()
+{
+    delete ms_instance;
+    ms_instance = nullptr;
+}
+
+BufferManager::BufferManager()
+{
+}
+
+void BufferManager::register_buffer(Buffer* buffer)
+{
+    assert(buffer);
+    const std::string& name = buffer->name();
+    if (m_buffers.find(name) != m_buffers.end())
+        throw name_not_unique();
+
+    m_buffers[name] = std::unique_ptr<Buffer>(buffer);
+}
+
+void BufferManager::delete_buffer(Buffer* buffer)
+{
+    assert(buffer);
+    auto buffer_it = m_buffers.find(buffer->name());
+    assert(buffer_it->second.get() == buffer);
+    m_buffers.erase(buffer_it);
+}
+
+Buffer* BufferManager::get_buffer(const std::string& name)
+{
+    if (m_buffers.find(name) == m_buffers.end())
+        return nullptr;
+
+    return m_buffers[name].get();
+}
+
+
+}