Insert and delete lines

terminalframebuffer.cpp

@@ -298,3 +298,25 @@ void DrawState::restore_cursor( void )
   snap_cursor_to_border();
   new_grapheme();
 }
+
+void Framebuffer::insert_line( int before_row )
+{
+  if ( (before_row < ds.get_scrolling_region_top_row())
+       || (before_row > ds.get_scrolling_region_bottom_row() + 1) ) {
+    return;
+  }
+
+  rows.erase( rows.begin() + ds.get_scrolling_region_bottom_row() );
+  rows.insert( rows.begin() + before_row, Row( ds.get_width() ) );
+}
+
+void Framebuffer::delete_line( int row )
+{
+  if ( (row < ds.get_scrolling_region_top_row())
+       || (row > ds.get_scrolling_region_bottom_row() + 1) ) {
+    return;
+  }
+
+  rows.erase( rows.begin() + row );
+  rows.insert( rows.begin() + ds.get_scrolling_region_bottom_row(), Row( ds.get_width() ) );
+}

terminalframebuffer.hpp

@@ -120,6 +120,8 @@ namespace Terminal {
 
     void apply_renditions_to_current_cell( void );
     void claim_overlap( int row, int col );
+    void insert_line( int before_row );
+    void delete_line( int row );
   };
 }
 

terminalfunctions.cpp

@@ -309,3 +309,35 @@ void CSI_DSR( Framebuffer *fb, Dispatcher *dispatch )
 }
 
 static Function func_CSI_DSR( CSI, "n", CSI_DSR );
+
+/* insert line */
+void CSI_IL( Framebuffer *fb, Dispatcher *dispatch )
+{
+  int lines = dispatch->getparam( 0, 1 );
+
+  for ( int i = 0; i < lines; i++ ) {
+    fb->insert_line( fb->ds.get_cursor_row() );
+  }
+
+  /* vt220 manual and Ecma-48 say to move to first column */
+  /* but xterm and gnome-terminal don't */
+  fb->ds.move_col( 0 );
+}
+
+static Function func_CSI_IL( CSI, "L", CSI_IL );
+
+/* delete line */
+void CSI_DL( Framebuffer *fb, Dispatcher *dispatch )
+{
+  int lines = dispatch->getparam( 0, 1 );
+
+  for ( int i = 0; i < lines; i++ ) {
+    fb->delete_line( fb->ds.get_cursor_row() );
+  }
+
+  /* same story -- xterm and gnome-terminal don't
+     move to first column */
+  fb->ds.move_col( 0 );
+}
+
+static Function func_CSI_DL( CSI, "M", CSI_DL );