[tcell] 24-bit color support

TAGS=tcell make install

    printf "\x1b[38;2;100;200;250mTRUECOLOR\x1b[m\n" |
        TERM=xterm-truecolor fzf --ansi

src/ansi.go

@@ -169,6 +169,8 @@ func interpretCode(ansiCode string, prevState *ansiState) *ansiState {
 				}
 			case 1:
 				switch num {
+				case 2:
+					state256 = 10 // MAGIC
 				case 5:
 					state256++
 				default:
@@ -177,8 +179,20 @@ func interpretCode(ansiCode string, prevState *ansiState) *ansiState {
 			case 2:
 				*ptr = tui.Color(num)
 				state256 = 0
+			case 10:
+				*ptr = tui.Color(1<<24) | tui.Color(num<<16)
+				state256++
+			case 11:
+				*ptr = *ptr | tui.Color(num<<8)
+				state256++
+			case 12:
+				*ptr = *ptr | tui.Color(num)
+				state256 = 0
 			}
 		}
 	}
+	if state256 > 0 {
+		*ptr = -1
+	}
 	return state
 }

src/tui/ncurses.go

@@ -295,6 +295,10 @@ func RefreshWindows(windows []*Window) {
 }
 
 func PairFor(fg Color, bg Color) ColorPair {
+	// ncurses does not support 24-bit colors
+	if fg.is24() || bg.is24() {
+		return ColDefault
+	}
 	key := (int(fg) << 8) + int(bg)
 	if found, prs := _colorMap[key]; prs {
 		return found

src/tui/tcell.go

@@ -11,8 +11,9 @@ import (
 
 	"runtime"
 
-	"github.com/gdamore/tcell"
+	// https://github.com/gdamore/tcell/pull/135
-	"github.com/gdamore/tcell/encoding"
+	"github.com/junegunn/tcell"
+	"github.com/junegunn/tcell/encoding"
 
 	"github.com/junegunn/go-runewidth"
 )

src/tui/tui.go

@@ -93,7 +93,11 @@ const (
 	doubleClickDuration = 500 * time.Millisecond
 )
 
-type Color int16
+type Color int32
+
+func (c Color) is24() bool {
+	return c > 0 && (c&(1<<24)) > 0
+}
 
 const (
 	colUndefined Color = -2