[ncurses6] Support italics

src/ansi.go

@@ -143,15 +143,17 @@ func interpretCode(ansiCode string, prevState *ansiState) *ansiState {
 				case 49:
 					state.bg = -1
 				case 1:
-					state.attr = tui.Bold
+					state.attr = state.attr | tui.Bold
 				case 2:
-					state.attr = tui.Dim
+					state.attr = state.attr | tui.Dim
+				case 3:
+					state.attr = state.attr | tui.Italic
 				case 4:
-					state.attr = tui.Underline
+					state.attr = state.attr | tui.Underline
 				case 5:
-					state.attr = tui.Blink
+					state.attr = state.attr | tui.Blink
 				case 7:
-					state.attr = tui.Reverse
+					state.attr = state.attr | tui.Reverse
 				case 0:
 					init()
 				default:

src/tui/ncurses.go

@@ -30,7 +30,7 @@ import (
 )
 
 type ColorPair int16
-type Attr C.int
+type Attr C.uint
 type WindowImpl C.WINDOW
 
 const (
@@ -39,6 +39,7 @@ const (
 	Blink          = C.A_BLINK
 	Reverse        = C.A_REVERSE
 	Underline      = C.A_UNDERLINE
+	Italic         = C.A_VERTICAL << 1 // FIXME
 )
 
 const (

src/tui/tcell.go

@@ -48,6 +48,7 @@ const (
 	Blink          = Attr(tcell.AttrBlink)
 	Reverse        = Attr(tcell.AttrReverse)
 	Underline      = Attr(tcell.AttrUnderline)
+	Italic         = Attr(tcell.AttrNone) // Not supported
 )
 
 const (