From ad29a350d6e53c6a327cd76f8ee26fe1e450781d Mon Sep 17 00:00:00 2001
From: Keith Winstein <keithw@mit.edu>
Date: Mon, 31 Jan 2011 23:16:17 -0500
Subject: [PATCH] Color support (and bold and other renditions)

---
 terminal.cpp            | 15 +++++++++++++++
 terminalframebuffer.cpp | 18 ++++++++++++++++--
 terminalframebuffer.hpp |  8 ++++++++
 terminalfunctions.cpp   | 15 +++++++++++++++
 4 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/terminal.cpp b/terminal.cpp
index 1481ea4..c7155f9 100644
--- a/terminal.cpp
+++ b/terminal.cpp
@@ -77,6 +77,7 @@ void Emulator::print( Parser::Print *act )
     this_cell->reset();
     this_cell->contents.push_back( act->ch );
     this_cell->width = chwidth;
+    fb.apply_renditions_to_current_cell();
 
     fb.claim_overlap( fb.ds.get_cursor_row(), fb.ds.get_cursor_col() );
 
@@ -143,6 +144,20 @@ void Emulator::debug_printout( int fd )
       assert( (cell->overlapped_cells.size() + 1 == (size_t)cell->width)
 	      || (x == fb.ds.get_width() - 1) );
 
+      /* print renditions */
+      screen.append( "\033[0" );
+      char rendition[ 32 ];
+      for ( std::vector<int>::iterator i = cell->renditions.begin();
+	    i != cell->renditions.end();
+	    i++ ) {
+	snprintf( rendition, 32, ";%d", *i );
+	screen.append( rendition );
+      }
+      screen.append( "m" );
+
+      /* print cell contents */
+
+      /* cells that begin with combining character get combiner attached to no-break space */
       if ( cell->fallback ) {
 	char utf8[ 8 ];
 	snprintf( utf8, 8, "%lc", 0xA0 );
diff --git a/terminalframebuffer.cpp b/terminalframebuffer.cpp
index b19c05a..a60c1d4 100644
--- a/terminalframebuffer.cpp
+++ b/terminalframebuffer.cpp
@@ -9,7 +9,8 @@ Cell::Cell()
     contents(),
     overlapped_cells(),
     fallback( false ),
-    width( 1 )
+    width( 1 ),
+    renditions()
 {}
 
 Cell::Cell( const Cell &x )
@@ -17,7 +18,8 @@ Cell::Cell( const Cell &x )
     contents( x.contents ),
     overlapped_cells( x.overlapped_cells ),
     fallback( x.fallback ),
-    width( 1 )
+    width( x.width ),
+    renditions( x.renditions )
 {}
 
 Cell & Cell::operator=( const Cell &x )
@@ -26,6 +28,8 @@ Cell & Cell::operator=( const Cell &x )
   contents = x.contents;
   overlapped_cells = x.overlapped_cells;
   fallback = x.fallback;
+  width = x.width;
+  renditions = x.renditions;
 
   return *this;
 }
@@ -39,6 +43,7 @@ void Cell::reset( void )
   contents.clear();
   fallback = false;
   width = 1;
+  renditions.clear();
 
   if ( overlapping_cell ) {
     assert( overlapped_cells.size() == 0 );
@@ -58,6 +63,7 @@ DrawState::DrawState( int s_width, int s_height )
     cursor_col( 0 ), cursor_row( 0 ),
     combining_char_col( 0 ), combining_char_row( 0 ), tabs( s_width ),
     scrolling_region_top_row( 0 ), scrolling_region_bottom_row( height - 1 ),
+    renditions(),
     next_print_will_wrap( false ), origin_mode( false ), auto_wrap_mode( true )
 {
   for ( int i = 0; i < width; i++ ) {
@@ -256,3 +262,11 @@ std::vector<int> DrawState::get_tabs( void )
 
   return ret;
 }
+
+void Framebuffer::apply_renditions_to_current_cell( void )
+{
+  Cell *this_cell = get_cell();
+  assert( this_cell );
+
+  this_cell->renditions = ds.get_renditions();
+}
diff --git a/terminalframebuffer.hpp b/terminalframebuffer.hpp
index c71984a..ea5db22 100644
--- a/terminalframebuffer.hpp
+++ b/terminalframebuffer.hpp
@@ -14,6 +14,7 @@ namespace Terminal {
     std::vector<Cell *> overlapped_cells;
     char fallback; /* first character is combining character */
     int width;
+    std::vector<int> renditions; /* e.g., bold, blinking, etc. */
 
     Cell();
 
@@ -44,6 +45,8 @@ namespace Terminal {
 
     int scrolling_region_top_row, scrolling_region_bottom_row;
 
+    std::vector<int> renditions;
+
   public:
     bool next_print_will_wrap;
     bool origin_mode;
@@ -75,6 +78,10 @@ namespace Terminal {
     int limit_top( void );
     int limit_bottom( void );
 
+    void clear_renditions( void ) { renditions.clear(); }
+    void add_rendition( int x ) { renditions.push_back( x ); }
+    const std::vector<int> get_renditions( void ) { return renditions; }
+
     DrawState( int s_width, int s_height );
   };
 
@@ -94,6 +101,7 @@ namespace Terminal {
     Cell *get_cell( int row, int col );
     Cell *get_combining_cell( void );
 
+    void apply_renditions_to_current_cell( void );
     void claim_overlap( int row, int col );
   };
 }
diff --git a/terminalfunctions.cpp b/terminalfunctions.cpp
index 9ebb970..569e2be 100644
--- a/terminalfunctions.cpp
+++ b/terminalfunctions.cpp
@@ -259,3 +259,18 @@ void Ctrl_BEL( Framebuffer *fb __attribute((unused)), Dispatcher *dispatch __att
 {}
 
 static Function func_Ctrl_BEL( CONTROL, "\x07", Ctrl_BEL );
+
+/* select graphics rendition -- e.g., bold, blinking, etc. */
+void CSI_SGR( Framebuffer *fb, Dispatcher *dispatch )
+{
+  for ( int i = 0; i < dispatch->param_count(); i++ ) {
+    int rendition = dispatch->getparam( i, 0 );
+    if ( rendition == 0 ) {
+      fb->ds.clear_renditions();
+    } else {
+      fb->ds.add_rendition( rendition );
+    }
+  }
+}
+
+static Function func_CSI_SGR( CSI, "m", CSI_SGR );