Implement dd command to delete line

src/gui/BufferPane.cc

@@ -478,6 +478,41 @@ void BufferPane::redo()
     m_window->request_redraw();
 }
 
+void BufferPane::delete_motion(const Command::Unit & motion)
+{
+    std::shared_ptr<Buffer::Range> range = get_range_for_motion(motion);
+    if (range)
+    {
+        m_buffer->erase_range(*range);
+        m_buffer_view->update();
+    }
+}
+
+std::shared_ptr<Buffer::Range> BufferPane::get_range_for_motion(const Command::Unit & motion)
+{
+    if (!m_iterator->valid())
+    {
+        return nullptr;
+    }
+
+    auto start = m_iterator->clonep();
+    auto end = m_iterator->clonep();
+
+    switch (motion.id)
+    {
+    case Command::Motion::THIS_LINE:
+        start->go_start_of_line();
+        end->go_end_of_line(true);
+        end->go_forward();
+        break;
+
+    default:
+        return nullptr;
+    }
+
+    return std::make_shared<Buffer::Range>(start, end);
+}
+
 void BufferPane::set_command_mode()
 {
     m_command_mode = true;

src/gui/BufferPane.h

@@ -42,6 +42,7 @@ public:
     void scroll_window_down(Window::ScrollMode scroll_mode);
     void undo();
     void redo();
+    void delete_motion(const Command::Unit & motion);
     void set_show_status_bar(bool show_status_bar)
     {
         m_show_status_bar = show_status_bar;
@@ -77,6 +78,7 @@ protected:
     void draw_status_bar();
     int calculate_lines_to_scroll(Window::ScrollMode scroll_mode);
     void resize_buffer_view();
+    std::shared_ptr<Buffer::Range> get_range_for_motion(const Command::Unit & motion);
 
     Window * m_window;
     std::shared_ptr<Buffer> m_buffer;

src/gui/Window.cc

@@ -338,6 +338,11 @@ void Window::execute_command(const Command & command)
     case Command::DELETE_MOTION:
         break;
     case Command::DELETE_LINE:
+        {
+            Command::Unit motion = command.motion;
+            motion.id = Command::Motion::THIS_LINE;
+            m_focused_buffer_pane->delete_motion(motion);
+        }
         break;
     case Command::DELETE_CHAR:
         m_focused_buffer_pane->kill_character_forward();