From 481d45d0f8e0e5ee63a39f950660b7305ff88d5e Mon Sep 17 00:00:00 2001
From: Stanislav Spassov <stanspas@amazon.de>
Date: Sat, 3 Aug 2019 19:32:57 +0200
Subject: [PATCH] Add support for ECMA-48 escape sequence for faint/half-bright

ECMA-48 defines rendition mode 2 as:
  faint, decreased intensity or second colour

Faint mode shares its inverse (22) with bold (1):
  normal colour or normal intensity (neither bold nor faint)

The Renditions::attribute_type enum already included 'faint'
but the value remained unused until now.

Signed-off-by: Stanislav Spassov <stanspas@amazon.de>
---
 src/terminal/terminalframebuffer.cc | 8 +++++++-
 src/tests/emulation-attributes.test | 2 ++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/terminal/terminalframebuffer.cc b/src/terminal/terminalframebuffer.cc
index 2751f3b7d..ea7ad55ee 100644
--- a/src/terminal/terminalframebuffer.cc
+++ b/src/terminal/terminalframebuffer.cc
@@ -491,7 +491,12 @@ void Renditions::set_rendition( color_type num )
 
   bool value = num < 9;
   switch ( num ) {
-  case 1: case 22: set_attribute(bold, value); break;
+  case 1: set_attribute(bold, value); break;
+  case 2: set_attribute(faint, value); break;
+  case 22:
+          set_attribute(bold, value);
+          set_attribute(faint, value);
+          break;
   case 3: case 23: set_attribute(italic, value); break;
   case 4: case 24: set_attribute(underlined, value); break;
   case 5: case 25: set_attribute(blink, value); break;
@@ -526,6 +531,7 @@ std::string Renditions::sgr( void ) const
 
   ret.append( "\033[0" );
   if ( get_attribute( bold ) ) ret.append( ";1" );
+  if ( get_attribute( faint ) ) ret.append( ";2" );
   if ( get_attribute( italic ) ) ret.append( ";3" );
   if ( get_attribute( underlined ) ) ret.append( ";4" );
   if ( get_attribute( blink ) ) ret.append( ";5" );
diff --git a/src/tests/emulation-attributes.test b/src/tests/emulation-attributes.test
index e4ba2f3fe..336392c4f 100755
--- a/src/tests/emulation-attributes.test
+++ b/src/tests/emulation-attributes.test
@@ -110,6 +110,8 @@ baseline()
             test_true_color
             echo "Bold:"
             test_true_color 1
+            echo "Faint:"
+            test_true_color 2
             echo "Italic:"
             test_true_color 3
             echo "Underline:"