Progress towards a word-wrap stream helper.

word_wrap.h

@@ -5,13 +5,50 @@ static_assert( __cplusplus > 2020'00 );
 #include <cstddef>
 
 #include <string>
+#include <streambuf>
 
 namespace Alepha::inline Cavorite  ::detail::  word_wrap
 {
 	inline namespace exports
 	{
 		std::string wordWrap( const std::string &text, std::size_t width, std::size_t nextLineOffset= 0 );
+
+		class WordWrapStreambuf;
 	}
+
+	class exports::WordWrapStreambuf
+		: public std::streambuf
+	{
+		public:
+			std::streambuf *underlying= nullptr;
+
+			std::size_t maximumWidth= 0;
+			std::size_t nextLineOffset= 0;
+			std::size_t currentLineLength= 0;
+
+			std::string currentWord;
+
+			void writeChar( const char ch );
+
+			void drain();
+
+		public:
+			int
+			overflow( const int ch ) override
+			{
+				if( ch == EOF ) throw std::logic_error( "EOF!" );
+				writeChar( ch );
+
+				return 1;
+			}
+
+			std::streamsize
+			xsputn( const char *const data, const std::streamsize amt ) override
+			{
+				for( std::streamsize i= 0; i< amt; ++i ) overflow( data[ i ] );
+				return amt;
+			}
+	};
 }
 
 namespace Alepha::Cavorite::inline exports::inline word_wrap