/usr/lib/swipl/library/ansi_term.pl
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 ansi_format(+Attributes, +Format, +Args) is det
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 or a list thereof. 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)

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

  • black, red, green, yellow, blue, magenta, cyan, white

ANSI sequences are sent if and only if

  • The current_output has the property tty(true) (see stream_property/2).
  • The Prolog flag color_term is true.