Have to tweak when to test that true color is set, and also when to do it for the test.

ansi_parser.cpp

@@ -87,12 +87,16 @@ static const int foo_en_main = 19;
 
 #line 84 "ansi_parser.rl"
 
+#include <ftxui/screen/terminal.hpp>
 
 ANSIParser::ANSIParser(sf::Color default_fg, sf::Color default_bg) :
   $default_fg(default_fg),
   $default_bg(default_bg)
 {
-
+  // the parser only handles full color so force it
+  if(ftxui::Terminal::ColorSupport() != ftxui::Terminal::Color::TrueColor) {
+    ftxui::Terminal::SetColorSupport(ftxui::Terminal::Color::TrueColor);
+  }
 }
 
 bool ANSIParser::parse(const std::string &screen, WriteCB write) {
@@ -112,14 +116,14 @@ bool ANSIParser::parse(std::wstring_view codes, WriteCB write) {
   sf::Color &target = color;
 
   
-#line 107 "ansi_parser.cpp"
+#line 111 "ansi_parser.cpp"
 	{
 	cs = foo_start;
 	}
 
-#line 110 "ansi_parser.rl"
+#line 114 "ansi_parser.rl"
   
-#line 110 "ansi_parser.cpp"
+#line 114 "ansi_parser.cpp"
 	{
 	int _klen;
 	unsigned int _trans;
@@ -272,7 +276,7 @@ _match:
 #line 59 "ansi_parser.rl"
 	{ }
 	break;
-#line 249 "ansi_parser.cpp"
+#line 253 "ansi_parser.cpp"
 		}
 	}
 
@@ -292,7 +296,7 @@ _again:
 #line 59 "ansi_parser.rl"
 	{ }
 	break;
-#line 267 "ansi_parser.cpp"
+#line 271 "ansi_parser.cpp"
 		}
 	}
 	}
@@ -300,7 +304,7 @@ _again:
 	_out: {}
 	}
 
-#line 111 "ansi_parser.rl"
+#line 115 "ansi_parser.rl"
 
   return p - pe == 0;
 }

tests/ansi_parser.cpp

@@ -17,6 +17,8 @@ using namespace fmt;
 using namespace ftxui;
 
 std::string generate_colors() {
+  REQUIRE(ftxui::Terminal::ColorSupport() == Terminal::Color::TrueColor);
+
   const int max_value = 255;
   const int value_increment = 8;
   const int hue_increment = 6;
@@ -36,8 +38,6 @@ std::string generate_colors() {
     array.push_back(hbox(std::move(line)));
   }
 
-  println("MADE {} CHARS", count);
-
   auto true_color_display = vbox({
       vbox(std::move(array)),
   });
@@ -52,13 +52,14 @@ std::string generate_colors() {
 }
 
 TEST_CASE("test out ragel parser", "[gui]") {
-  std::string colors = generate_colors();
-  std::cout << colors;
   sf::Color default_fg(0,0,0);
   sf::Color default_bg(100,100,100);
+
+  // this sets the Truecolor so need to do it first
   ANSIParser parser(default_fg, default_bg);
+  std::string colors = generate_colors();
+  std::cout << colors;
 
-  REQUIRE(ftxui::Terminal::ColorSupport() == Terminal::Color::TrueColor);
 
   bool good = parser.parse(colors, [&](sf::Color bgcolor, sf::Color color, wchar_t ch) {
       bool correct_char = ch == '#' || ch == ' ' || ch == '\n' || ch == '\r';