SWI-Prolog -- ansi

Documentation
- Reference manual
  - The SWI-Prolog library
    - library(ansi_term): Print decorated text to ANSI consoles
- Packages

Availability::- use_module(library(ansi_term)).(can be autoloaded)

[det]ansi_sgr(+ClassOrAttributes, -Sequence:string)

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.