add named logger + color formatting

internal/format/color.go

@@ -0,0 +1,21 @@
+package format
+
+import "fmt"
+
+const (
+	DefaultColor Color = iota + 30
+	Red
+	Green
+	Yellow
+	Blue
+	Magenta
+	Cyan
+	White
+)
+
+type Color uint8
+
+// TODO: not cross platform (windows...)
+func (c Color) Format(s string) string {
+	return fmt.Sprintf("\x1b[%dm%s\x1b[0m", c, s)
+}