Change buffer order based on the last one used

src/buffer_manager.cc

@@ -52,6 +52,16 @@ Buffer* BufferManager::get_buffer(const String& name)
     return nullptr;
 }
 
+void BufferManager::set_last_used_buffer(Buffer& buffer)
+{
+    auto it = m_buffers.begin();
+    while (*it != &buffer and it != m_buffers.end())
+        ++it;
+    assert(it != m_buffers.end());
+    m_buffers.erase(it);
+    m_buffers.emplace(m_buffers.begin(), &buffer);
+}
+
 CandidateList BufferManager::complete_buffername(const String& prefix,
                                                  CharCount cursor_pos)
 {

src/buffer_manager.hh

@@ -27,6 +27,7 @@ public:
     size_t   count() const { return m_buffers.size(); }
 
     Buffer* get_buffer(const String& name);
+    void    set_last_used_buffer(Buffer& buffer);
 
     CandidateList complete_buffername(const String& prefix,
                                       CharCount cursor_pos = -1);

src/commands.cc

@@ -288,6 +288,7 @@ void edit(const CommandParameters& params, Context& context)
             buffer = open_or_create(name, context);
     }
 
+    BufferManager::instance().set_last_used_buffer(*buffer);
     Window& window = *buffer->get_or_create_window();
 
     if (param_count > 1)
@@ -382,6 +383,7 @@ void show_buffer(const CommandParameters& params, Context& context)
     if (not buffer)
         throw runtime_error("buffer " + buffer_name + " does not exists");
 
+    BufferManager::instance().set_last_used_buffer(*buffer);
     context.change_editor(*buffer->get_or_create_window());
 }