A.2 library(ansi_term): Print decorated text to ANSI consoles
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Availability::- use_module(library(ansi_term)).(can be autoloaded)
Source[det]ansi_format(+ClassOrAttributes, +Format, +Args)
Format text with ANSI attributes. This predicate behaves as format/2 using Format and Args, but if the current_output is a terminal, it adds ANSI escape sequences according to Attributes. For example, to print a text in bold cyan, do 
?- ansi_format([bold,fg(cyan)], 'Hello ~w', [world]).

Attributes is either a single attribute, a list thereof or a term that is mapped to concrete attributes based on the current theme (see prolog:console_color/2). The attribute names are derived from the ANSI specification. See the source for sgr_code/2 for details. Some commonly used attributes are:

bold
underline
fg(Color) , bg(Color),hfg(Color),hbg(Color)
For fg(Color) and bg(Color), the colour name can be’#RGB' or’#RRGGBB'
fg8(Spec) , bg8(Spec)
8-bit color specification. Spec is a colour name, h(Color) or an integer 0..255.
fg(R, G, B) , bg(R, G, B)
24-bit (direct color) specification. The components are integers in the range 0..255.

Defined color constants are below. default can be used to access the default color of the terminal.

ANSI sequences are sent if and only if