Support "Print" action.

terminal.cpp

@@ -1,3 +1,5 @@
+#include <assert.h>
+
 #include "terminal.hpp"
 
 using namespace Terminal;
@@ -57,7 +59,72 @@ void Emulator::input( char c )
   }
 }
 
+void Emulator::scroll( int N )
+{
+  if ( N == 0 ) {
+    return;
+  } else if ( N > 0 ) {
+    for ( int i = 0; i < N; i++ ) {
+      rows.pop_front();
+      rows.push_back( Row( width ) );
+      cursor_row--;
+    }
+  }
+}
+
+void Emulator::newgrapheme( void )
+{
+  combining_char_col = cursor_col;
+  combining_char_row = cursor_row;  
+}
+
 void Emulator::print( Parser::Print *act )
 {
-  fprintf( stderr, "print (%lc)!\r\n", act->ch );
+  assert( act->char_present );
+
+  if ( (width == 0) || (height == 0) ) {
+    return;
+  }
+
+  assert( cursor_row < height ); /* must be on screen */
+  assert( cursor_row <= width ); /* one off is ok */
+
+  int chwidth = act->ch == L'\0' ? -1 : wcwidth( act->ch );
+
+  switch ( chwidth ) {
+  case 1: /* normal character */
+  case 2: /* wide character */
+    if ( cursor_col >= width ) { /* wrap */
+      cursor_col = 0;
+      cursor_row++;
+    }
+
+    if ( cursor_row >= height ) { /* scroll */
+      scroll( cursor_row - height + 1 );
+    }
+
+    rows[ cursor_row ].cells[ cursor_col ].contents.clear();
+    rows[ cursor_row ].cells[ cursor_col ].contents.push_back( act->ch );
+    newgrapheme();
+    cursor_col++;
+  }
+}
+
+void Emulator::debug_printout( FILE *f )
+{
+  fprintf( f, "\033[H\033[2J" );
+
+  for ( size_t y = 0; y < height; y++ ) {
+    for ( size_t x = 0; x < width; x++ ) {
+      fprintf( f, "\033[%d;%dH", y + 1, x + 1 );
+      Cell *cell = &rows[ y ].cells[ x ];
+      for ( std::vector<wchar_t>::iterator i = cell->contents.begin();
+	    i != cell->contents.end();
+	    i++ ) {
+	fprintf( f, "%lc", *i );
+      }
+    }
+  }
+
+  fflush( NULL );
 }