?- 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.

• 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.