new feature: support for underlined text

doc/config

@@ -123,6 +123,7 @@
 ## After that you can put:
 ##
 ## - b - bold text
+## - u - underlined text
 ## - r - reverse colors
 ## - a - use alternative character set
 ##

src/helpers.h

@@ -103,6 +103,9 @@ template <typename C> void String2Buffer(const std::basic_string<C> &s, basic_bu
 				case 'b':
 					buf << fmtBold;
 					break;
+				case 'u':
+					buf << fmtUnderline;
+					break;
 				case 'a':
 					buf << fmtAltCharset;
 					break;
@@ -115,6 +118,9 @@ template <typename C> void String2Buffer(const std::basic_string<C> &s, basic_bu
 						case 'b':
 							buf << fmtBoldEnd;
 							break;
+						case 'u':
+							buf << fmtUnderlineEnd;
+							break;
 						case 'a':
 							buf << fmtAltCharsetEnd;
 							break;

src/window.cpp

@@ -87,6 +87,7 @@ Window::Window(size_t startx,
 		itsBorder(border),
 		itsHistory(0),
 		itsBoldCounter(0),
+		itsUnderlineCounter(0),
 		itsReverseCounter(0),
 		itsAltCharsetCounter(0)
 {
@@ -137,6 +138,7 @@ Window::Window(const Window &w) : itsWindow(dupwin(w.itsWindow)),
 				itsBorder(w.itsBorder),
 				itsHistory(w.itsHistory),
 				itsBoldCounter(w.itsBoldCounter),
+				itsUnderlineCounter(w.itsUnderlineCounter),
 				itsReverseCounter(w.itsReverseCounter),
 				itsAltCharsetCounter(w.itsAltCharsetCounter)
 {
@@ -328,6 +330,11 @@ void Window::Bold(bool bold_state) const
 	(bold_state ? wattron : wattroff)(itsWindow, A_BOLD);
 }
 
+void Window::Underline(bool underline_state) const
+{
+	(underline_state ? wattron : wattroff)(itsWindow, A_UNDERLINE);
+}
+
 void Window::Reverse(bool reverse_state) const
 {
 	(reverse_state ? wattron : wattroff)(itsWindow, A_REVERSE);
@@ -745,6 +752,13 @@ Window &Window::operator<<(Format format)
 			if (--itsBoldCounter <= 0)
 				Bold((itsBoldCounter = 0));
 			break;
+		case fmtUnderline:
+			Underline(++itsUnderlineCounter);
+			break;
+		case fmtUnderlineEnd:
+			if (--itsUnderlineCounter <= 0)
+				Underline((itsUnderlineCounter = 0));
+			break;
 		case fmtReverse:
 			Reverse(++itsReverseCounter);
 			break;

src/window.h

@@ -85,7 +85,13 @@ namespace NCurses
 	
 	/// Format flags used by NCurses
 	///
-	enum Format { fmtNone = 100, fmtBold, fmtBoldEnd, fmtReverse, fmtReverseEnd, fmtAltCharset, fmtAltCharsetEnd };
+	enum Format {
+		fmtNone = clEnd+1,
+		fmtBold, fmtBoldEnd,
+		fmtUnderline, fmtUnderlineEnd,
+		fmtReverse, fmtReverseEnd,
+		fmtAltCharset, fmtAltCharsetEnd
+	};
 	
 	/// Available border colors for window
 	///
@@ -458,6 +464,11 @@ namespace NCurses
 			///
 			void Bold(bool bold_state) const;
 			
+			/// Sets state of underline attribute (internal use only)
+			/// @param underline_state state of underline attribute
+			///
+			void Underline(bool underline_state) const;
+			
 			/// Sets state of reverse attribute (internal use only)
 			/// @param reverse_state state of reverse attribute
 			///
@@ -543,6 +554,7 @@ namespace NCurses
 			
 			/// counters for format flags
 			int itsBoldCounter;
+			int itsUnderlineCounter;
 			int itsReverseCounter;
 			int itsAltCharsetCounter;
 	};