xterm method
Directly index the xterm 256 color palette. Compatible with ansicolor's AnsiPen.xterm() signature.
Implementation
AnsiPen xterm(int color, {bool bg = false}) {
final int code = color < 0
? 0
: color > 255
? 255
: color;
styleStack.add(
bg ? QuectoColors.bgAnsi256(code) : QuectoColors.ansi256(code),
);
return this;
}