Use delimiter stream adaptor in some output.

Console.cc

@@ -22,8 +22,10 @@ static_assert( __cplusplus > 2020'99 );
 #include "Enum.h"
 #include "ProgramOptions.h"
 #include "string_algorithms.h"
+#include "delimited_list.h"
 #include "AutoRAII.h"
 
+
 /*  
  * All of the terminal control code in this library uses ANSI escape sequences (https://en.wikipedia.org/wiki/ANSI_escape_code).
  * Instead of using termcap and curses, code can use this simpler library instead.  The simple fact is that in 2022, there's
@@ -242,12 +244,14 @@ namespace Alepha::Hydrogen  ::detail::  Console_m
 			--"dump-color-env-var"_option << []
 			{
 				std::cout << "export " << colorsEnv() << "-\"";
-				bool first= true;
+				AutoRAII delimiters
+				{
+					[]{ std::cout << StartDelimitedList{ ":"  }; },
+					[]{ std::cout << EndDelimitedList; }
+				};
 				for( const auto &[ name, sgr ]: colorVariables() )
 				{
-					if( not first ) std::cout << ":";
-					first= false;
-					std::cout << name.name << "=" << sgr.code;
+					std::cout << NextItem << name.name << "=" << sgr.code;
 				}
 				std::cout << "\"" << std::endl;
 				::exit( EXIT_SUCCESS );