color support

color.go

@@ -0,0 +1,36 @@
+package main
+
+import "github.com/fatih/color"
+
+var colorCache = map[string]*color.Color{}
+
+func makeColor(name string) (c *color.Color) {
+	// caching
+	if c, ok := colorCache[name]; ok {
+		return c
+	}
+	defer func() { colorCache[name] = c }()
+
+	switch name {
+	case "black":
+		return color.New(color.FgBlack)
+	case "red":
+		return color.New(color.FgRed)
+	case "green":
+		return color.New(color.FgGreen)
+	case "yellow":
+		return color.New(color.FgYellow)
+	case "blue":
+		return color.New(color.FgBlue)
+	case "magenta":
+		return color.New(color.FgMagenta)
+	case "cyan":
+		return color.New(color.FgCyan)
+	case "white":
+		return color.New(color.FgWhite)
+	case "":
+		return color.New()
+	default:
+		panic("unknown color name. valid color names: black, red, green, yellow, blue, magenta, cyan, white")
+	}
+}