diff --git a/tty-util.go b/tty-util.go
index 446d567..8657d76 100644
--- a/tty-util.go
+++ b/tty-util.go
@@ -29,142 +29,142 @@ type TTYContext struct {
 	isTTY [3]bool
 }
 
-func (self *TTYContext) Init() {
-	for i, _ := range self.isTTY {
-		self.isTTY[i] = StreamIsTerminal(getStream(uint(i)))
+func (ctx *TTYContext) Init() {
+	for i := range ctx.isTTY {
+		ctx.isTTY[i] = StreamIsTerminal(getStream(uint(i)))
 	}
 }
 
-func (self *TTYContext) IsTTY(fd uint) bool {
+func (ctx *TTYContext) IsTTY(fd uint) bool {
 	if fd == STDERR || fd == STDOUT {
-		return self.isTTY[fd]
+		return ctx.isTTY[fd]
 	}
 	return false
 }
 
-func (self *TTYContext) Clean() {
-	for i, _ := range self.isTTY {
-		self.isTTY[i] = false
+func (ctx *TTYContext) Clean() {
+	for i := range ctx.isTTY {
+		ctx.isTTY[i] = false
 	}
 }
 
-func (self *TTYContext) Bold(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) Bold(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[1m"
 	}
 	return ""
 }
 
-func (self *TTYContext) BoldOff(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) BoldOff(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[22m"
 	}
 	return ""
 }
 
-func (self *TTYContext) Underline(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) Underline(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[4m"
 	}
 	return ""
 }
 
-func (self *TTYContext) UnderlineOff(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) UnderlineOff(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[24m"
 	}
 	return ""
 }
 
-func (self *TTYContext) Italic(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) Italic(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[3m"
 	}
 	return ""
 }
 
-func (self *TTYContext) ItalicOff(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) ItalicOff(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[23m"
 	}
 	return ""
 }
 
-func (self *TTYContext) BlackFg(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) BlackFg(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[30m"
 	}
 	return ""
 }
 
-func (self *TTYContext) RedFg(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) RedFg(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[31m"
 	}
 	return ""
 }
 
-func (self *TTYContext) GreenFg(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) GreenFg(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[32m"
 	}
 	return ""
 }
 
-func (self *TTYContext) BrownFg(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) BrownFg(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[33m"
 	}
 	return ""
 }
 
-func (self *TTYContext) BlueFg(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) BlueFg(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[34m"
 	}
 	return ""
 }
 
-func (self *TTYContext) MagentaFg(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) MagentaFg(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[35m"
 	}
 	return ""
 }
 
-func (self *TTYContext) CyanFg(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) CyanFg(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[36m"
 	}
 	return ""
 }
 
-func (self *TTYContext) WhiteFg(fd uint) string {
-	if self.isTTY[fd] {
+func (ctx *TTYContext) WhiteFg(fd uint) string {
+	if ctx.isTTY[fd] {
 		return "\x1b[37m"
 	}
 	return ""
 }
 
-func (self *TTYContext) FgColor(fd uint, n uint) string {
+func (ctx *TTYContext) FgColor(fd uint, n uint) string {
 	var color string
 	switch n {
 	case BLACK:
-		color = self.BlackFg(fd)
+		color = ctx.BlackFg(fd)
 	case WHITE:
-		color = self.WhiteFg(fd)
+		color = ctx.WhiteFg(fd)
 	case RED:
-		color = self.RedFg(fd)
+		color = ctx.RedFg(fd)
 	case GREEN:
-		color = self.GreenFg(fd)
+		color = ctx.GreenFg(fd)
 	case BLUE:
-		color = self.BlueFg(fd)
+		color = ctx.BlueFg(fd)
 	case BROWN:
-		color = self.BrownFg(fd)
+		color = ctx.BrownFg(fd)
 	case CYAN:
-		color = self.CyanFg(fd)
+		color = ctx.CyanFg(fd)
 	case MAGENTA:
-		color = self.MagentaFg(fd)
+		color = ctx.MagentaFg(fd)
 	}
 	return color
 }
@@ -188,7 +188,7 @@ func (self *TTYContext) FgColor(fd uint, n uint) string {
 // 	return color
 // }
 
-func (self *TTYContext) Reset(fd uint) string {
+func (ctx *TTYContext) Reset(fd uint) string {
 	if StreamIsTerminal(getStream(fd)) {
 		return "\x1b[0m"
 	}