keep ansi attributes at next line

ui.go

@@ -20,7 +20,10 @@ import (
 	"github.com/nsf/termbox-go"
 )
 
-const gEscapeCode = 27
+const (
+	gEscapeCode         = 27
+	gAnsiColorResetMask = termbox.AttrBold | termbox.AttrUnderline | termbox.AttrReverse
+)
 
 var gAnsiCodes = map[int]termbox.Attribute{
 	0:  termbox.ColorDefault,
@@ -125,18 +128,8 @@ func (win *win) renew(w, h, x, y int) {
 	win.w, win.h, win.x, win.y = w, h, x, y
 }
 
-func (win *win) print(x, y int, fg, bg termbox.Attribute, s string) {
-	off := x
-	for i := 0; i < len(s); i++ {
-		r, w := utf8.DecodeRuneInString(s[i:])
-
-		if r == gEscapeCode && i+1 < len(s) && s[i+1] == '[' {
-			j := strings.IndexByte(s[i:min(len(s), i+32)], 'm')
-			if j == -1 {
-				continue
-			}
-
-			toks := strings.Split(s[i+2:i+j], ";")
+func applyAnsiCodes(s string, fg, bg termbox.Attribute) (termbox.Attribute, termbox.Attribute) {
+	toks := strings.Split(s, ";")
 
 	var nums []int
 	for _, t := range toks {
@@ -153,29 +146,41 @@ func (win *win) print(x, y int, fg, bg termbox.Attribute, s string) {
 		nums = append(nums, n)
 	}
 
-			for _, n := range nums {
-				if 30 <= n && n <= 37 {
-					fg = termbox.ColorDefault
-				}
-				if 40 <= n && n <= 47 {
-					bg = termbox.ColorDefault
-				}
-			}
-
 	for _, n := range nums {
 		attr, ok := gAnsiCodes[n]
 		if !ok {
 			log.Printf("unknown ansi code: %d", n)
 			continue
 		}
-				if 1 <= n && n <= 37 {
+		switch {
+		case n == 0:
+			fg, bg = attr, attr
+		case n == 1 || n == 4 || n == 7:
 			fg |= attr
-				}
-				if 40 <= n && n <= 47 {
-					bg |= attr
+		case 30 <= n && n <= 37:
+			fg &= gAnsiColorResetMask
+			fg |= attr
+		case 40 <= n && n <= 47:
+			bg = attr
 		}
 	}
 
+	return fg, bg
+}
+
+func (win *win) print(x, y int, fg, bg termbox.Attribute, s string) (termbox.Attribute, termbox.Attribute) {
+	off := x
+	for i := 0; i < len(s); i++ {
+		r, w := utf8.DecodeRuneInString(s[i:])
+
+		if r == gEscapeCode && i+1 < len(s) && s[i+1] == '[' {
+			j := strings.IndexByte(s[i:min(len(s), i+32)], 'm')
+			if j == -1 {
+				continue
+			}
+
+			fg, bg = applyAnsiCodes(s[i+2:i+j], fg, bg)
+
 			i += j
 			continue
 		}
@@ -194,6 +199,8 @@ func (win *win) print(x, y int, fg, bg termbox.Attribute, s string) {
 			x += runewidth.RuneWidth(r)
 		}
 	}
+
+	return fg, bg
 }
 
 func (win *win) printf(x, y int, fg, bg termbox.Attribute, format string, a ...interface{}) {
@@ -208,7 +215,7 @@ func (win *win) printReg(reg []string) {
 	fg, bg := termbox.ColorDefault, termbox.ColorDefault
 
 	for i, l := range reg {
-		win.print(2, i, fg, bg, l)
+		fg, bg = win.print(2, i, fg, bg, l)
 	}
 
 	return