public static void append(final StringBuilder builder, final String indent, final String line)
    {
        builder.append(indent).append(line).append('\n');
    }
Shortcut to append a line of generated code.

@param builder string builder to which to append the line.
@param indent  current text indentation.
@param line    line to be appended.
sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/java/JavaUtil.java