From 39dfccf4504219576389256599dadd2a0189346a Mon Sep 17 00:00:00 2001
From: Keith Winstein <keithw@mit.edu>
Date: Tue, 1 Feb 2011 02:11:46 -0500
Subject: [PATCH] Support insert mode and erase character

---
 terminal.cpp            |  6 ++++++
 terminalframebuffer.cpp |  3 ++-
 terminalframebuffer.hpp |  1 +
 terminalfunctions.cpp   | 47 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/terminal.cpp b/terminal.cpp
index e55948c..f5d6821 100644
--- a/terminal.cpp
+++ b/terminal.cpp
@@ -68,6 +68,12 @@ void Emulator::print( Parser::Print *act )
       fb.move_rows_autoscroll( 1 );
     }
 
+    if ( fb.ds.insert_mode ) {
+      for ( int i = 0; i < chwidth; i++ ) {
+	fb.insert_cell( fb.ds.get_cursor_row(), fb.ds.get_cursor_col() );
+      }
+    }
+
     this_cell = fb.get_cell();
 
     this_cell->reset();
diff --git a/terminalframebuffer.cpp b/terminalframebuffer.cpp
index 3af159e..40c7f27 100644
--- a/terminalframebuffer.cpp
+++ b/terminalframebuffer.cpp
@@ -46,7 +46,8 @@ DrawState::DrawState( int s_width, int s_height )
     combining_char_col( 0 ), combining_char_row( 0 ), tabs( s_width ),
     scrolling_region_top_row( 0 ), scrolling_region_bottom_row( height - 1 ),
     renditions(), save(),
-    next_print_will_wrap( false ), origin_mode( false ), auto_wrap_mode( true )
+    next_print_will_wrap( false ), origin_mode( false ), auto_wrap_mode( true ),
+    insert_mode( false )
 {
   for ( int i = 0; i < width; i++ ) {
     tabs[ i ] = ( (i % 8) == 0 );
diff --git a/terminalframebuffer.hpp b/terminalframebuffer.hpp
index a5072e8..970091a 100644
--- a/terminalframebuffer.hpp
+++ b/terminalframebuffer.hpp
@@ -66,6 +66,7 @@ namespace Terminal {
     bool next_print_will_wrap;
     bool origin_mode;
     bool auto_wrap_mode;
+    bool insert_mode;
 
     /* bold, etc. */
 
diff --git a/terminalfunctions.cpp b/terminalfunctions.cpp
index f50e0a9..c5682fb 100644
--- a/terminalfunctions.cpp
+++ b/terminalfunctions.cpp
@@ -249,6 +249,39 @@ void CSI_DECRM( Framebuffer *fb, Dispatcher *dispatch )
 static Function func_CSI_DECSM( CSI, "?h", CSI_DECSM );
 static Function func_CSI_DECRM( CSI, "?l", CSI_DECRM );
 
+static bool *get_ANSI_mode( int param, Framebuffer *fb ) {
+  switch ( param ) {
+  case 4: /* insert/replace mode */
+    return &(fb->ds.insert_mode);
+  }
+  return NULL;
+}
+
+/* set mode */
+void CSI_SM( Framebuffer *fb, Dispatcher *dispatch )
+{
+  for ( int i = 0; i < dispatch->param_count(); i++ ) {
+    bool *mode = get_ANSI_mode( dispatch->getparam( i, 0 ), fb );
+    if ( mode ) {
+      *mode = true;
+    }
+  }
+}
+
+/* clear mode */
+void CSI_RM( Framebuffer *fb, Dispatcher *dispatch )
+{
+  for ( int i = 0; i < dispatch->param_count(); i++ ) {
+    bool *mode = get_ANSI_mode( dispatch->getparam( i, 0 ), fb );
+    if ( mode ) {
+      *mode = false;
+    }
+  }
+}
+
+static Function func_CSI_SM( CSI, "h", CSI_SM );
+static Function func_CSI_RM( CSI, "l", CSI_RM );
+
 /* set top and bottom margins */
 void CSI_DECSTBM( Framebuffer *fb, Dispatcher *dispatch )
 {
@@ -392,3 +425,17 @@ void CSI_HPA( Framebuffer *fb, Dispatcher *dispatch )
 
 static Function func_CSI_CHA( CSI, "G", CSI_HPA ); /* ECMA-48 name: CHA */
 static Function func_CSI_HPA( CSI, "\x60", CSI_HPA ); /* ECMA-48 name: HPA */
+
+/* erase character */
+void CSI_ECH( Framebuffer *fb, Dispatcher *dispatch )
+{
+  int num = dispatch->getparam( 0, 1 );
+  int limit = fb->ds.get_cursor_col() + num;
+  if ( limit >= fb->ds.get_width() ) {
+    limit = fb->ds.get_width() - 1;
+  }
+
+  clearline( fb, -1, fb->ds.get_cursor_col(), limit );
+}
+
+static Function func_CSI_ECH( CSI, "X", CSI_ECH );