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Predicate ansi_sgr/2
 ansi_sgr(+ClassOrAttributes, -Sequence:string) is det
True when Sequence is the ANSI Select Graphic Rendition sequence that activates the attributes of ClassOrAttributes. Sequence is the empty string if the Prolog flag color_term is false or the class resolves to no attributes.

Unlike ansi_format/4 this does not write to a stream and thus does not require a terminal. It is used to decorate strings that are handed to code that is not aware of colors, notably the toplevel prompt (see the Prolog flag toplevel_prompt). As the caller controls where the sequence ends up, the caller is also responsible for verifying that the destination is a terminal and for emitting the reset sequence `\e[0m`.

See also
- ansi_format/3 for the possible values of ClassOrAttributes.
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