rewrite checkpoint

vendor/github.com/mgutz/ansi/print.go

@@ -0,0 +1,42 @@
+package ansi
+
+// PrintStyles prints all style combinations to the terminal.
+func PrintStyles() {
+	oldPlain := plain
+	plain = false
+
+	bgColors := []string{
+		"",
+		":black",
+		":red",
+		":green",
+		":yellow",
+		":blue",
+		":magenta",
+		":cyan",
+		":white",
+	}
+	for fg := range Colors {
+		for _, bg := range bgColors {
+			println(padColor(fg, []string{"" + bg, "+b" + bg, "+bh" + bg, "+u" + bg}))
+			println(padColor(fg, []string{"+uh" + bg, "+B" + bg, "+Bb" + bg /* backgrounds */, "" + bg + "+h"}))
+			println(padColor(fg, []string{"+b" + bg + "+h", "+bh" + bg + "+h", "+u" + bg + "+h", "+uh" + bg + "+h"}))
+		}
+	}
+	plain = oldPlain
+}
+
+func pad(s string, length int) string {
+	for len(s) < length {
+		s += " "
+	}
+	return s
+}
+
+func padColor(s string, styles []string) string {
+	buffer := ""
+	for _, style := range styles {
+		buffer += Color(pad(s+style, 20), s+style)
+	}
+	return buffer
+}