Insert cell / delete cell. Now usable under xterm TERM

terminal.cpp

@@ -58,10 +58,6 @@ void Emulator::print( Parser::Print *act )
 
   Cell *this_cell = fb.get_cell();
 
-  if ( !this_cell ) { /* zero-size framebuffer */
-    return;
-  }
-
   Cell *combining_cell = fb.get_combining_cell();
 
   switch ( chwidth ) {

terminalframebuffer.cpp

@@ -145,9 +145,8 @@ void Framebuffer::move_rows_autoscroll( int rows )
 
 Cell *Framebuffer::get_cell( void )
 {
-  if ( (ds.get_width() == 0) || (ds.get_height() == 0) ) {
-    return NULL;
-  }
+  assert( ds.get_width() );
+  assert( ds.get_height() );
 
   return &rows[ ds.get_cursor_row() ].cells[ ds.get_cursor_col() ];
 }
@@ -232,10 +231,7 @@ std::vector<int> DrawState::get_tabs( void )
 
 void Framebuffer::apply_renditions_to_current_cell( void )
 {
-  Cell *this_cell = get_cell();
-  assert( this_cell );
-
-  this_cell->renditions = ds.get_renditions();
+  get_cell()->renditions = ds.get_renditions();
 }
 
 SavedCursor::SavedCursor()
@@ -291,4 +287,21 @@ void Framebuffer::delete_line( int row )
 void Row::insert_cell( int col )
 {
   cells.insert( cells.begin() + col, Cell() );
+  cells.erase( cells.end() - 1 );
+}
+
+void Row::delete_cell( int col )
+{
+  cells.erase( cells.begin() + col );
+  cells.push_back( Cell() );
+}
+
+void Framebuffer::insert_cell( int row, int col )
+{
+  rows[ row ].insert_cell( col );
+}
+
+void Framebuffer::delete_cell( int row, int col )
+{
+  rows[ row ].delete_cell( col );
 }

terminalframebuffer.hpp

@@ -123,6 +123,9 @@ namespace Terminal {
 
     void insert_line( int before_row );
     void delete_line( int row );
+
+    void insert_cell( int row, int col );
+    void delete_cell( int row, int col );
   };
 }
 

terminalfunctions.cpp

@@ -341,3 +341,28 @@ void CSI_DL( Framebuffer *fb, Dispatcher *dispatch )
 }
 
 static Function func_CSI_DL( CSI, "M", CSI_DL );
+
+/* insert characters */
+void CSI_ICH( Framebuffer *fb, Dispatcher *dispatch )
+{
+  int cells = dispatch->getparam( 0, 1 );
+
+  for ( int i = 0; i < cells; i++ ) {
+    fb->insert_cell( fb->ds.get_cursor_row(), fb->ds.get_cursor_col() );
+  }
+}
+
+static Function func_CSI_ICH( CSI, "@", CSI_ICH );
+
+/* delete character */
+void CSI_DCH( Framebuffer *fb, Dispatcher *dispatch )
+{
+  int cells = dispatch->getparam( 0, 1 );
+
+  for ( int i = 0; i < cells; i++ ) {
+    fb->delete_cell( fb->ds.get_cursor_row(), fb->ds.get_cursor_col() );
+  }
+}
+
+static Function func_CSI_DCH( CSI, "P", CSI_DCH );
+