Provided by: libcolor-ansi-util-perl_0.164-1_all 
NAME
Color::ANSI::Util - Routines for dealing with ANSI colors
VERSION
This document describes version 0.164 of Color::ANSI::Util (from Perl distribution Color-
ANSI-Util), released on 2020-06-09.
SYNOPSIS
use Color::ANSI::Util qw(
ansifg
ansibg
);
say ansifg("f0c010"); # => "\e[33;1m" (on 16-color terminal)
# => "\e[38;5;11m" (on 256-color terminal)
# => "\e[38;2;240;192;16m" (on 24-bit-color terminal)
say ansibg("ff5f87"); # => "\e[47m" (on 16-color terminal)
# => "\e[48;5;7m" (on 256-color terminal)
# => "\e[48;2;255;95;135m" (on 24-bit-color terminal)
There are a bunch of other exportable functions too, mostly for converting between RGB and
ANSI color (16/256/24bit color depth).
DESCRIPTION
This module provides routines for dealing with ANSI colors. The two main functions are
"ansifg" and "ansibg". With those functions, you can specify colors in RGB and let it
output the correct ANSI color escape code according to the color depth support of the
terminal (whether 16-color, 256-color, or 24bit). There are other functions to convert
RGB to ANSI in specific color depths, or reverse functions to convert from ANSI to RGB
codes.
Keywords: xterm, xterm-256color, terminal
BUGS/NOTES
Algorithm for finding closest indexed color from RGB color currently not very efficient.
Probably can add some threshold square distance, below which we can shortcut to the final
answer.
FUNCTIONS
ansi16_to_rgb
Usage:
ansi16_to_rgb($color) -> color::rgb24
Convert ANSI-16 color to RGB.
Returns 6-hexdigit, e.g. 'ff00cc'.
This function is not exported by default, but exportable.
Arguments ('*' denotes required arguments):
· $color* => color::ansi16
Return value: (color::rgb24)
ansi256_to_rgb
Usage:
ansi256_to_rgb($color) -> color::rgb24
Convert ANSI-256 color to RGB.
This function is not exported by default, but exportable.
Arguments ('*' denotes required arguments):
· $color* => color::ansi256
Return value: (color::rgb24)
rgb_to_ansi16
Usage:
rgb_to_ansi16($color) -> color::ansi16
Convert RGB to ANSI-16 color.
This function is not exported by default, but exportable.
Arguments ('*' denotes required arguments):
· $color* => color::rgb24
Return value: (color::ansi16)
rgb_to_ansi16_bg_code
Usage:
rgb_to_ansi16_bg_code($color) -> str
Convert RGB to ANSI-16 color escape sequence to change background color.
This function is not exported by default, but exportable.
Arguments ('*' denotes required arguments):
· $color* => color::rgb24
Return value: (str)
rgb_to_ansi16_fg_code
Usage:
rgb_to_ansi16_fg_code($color) -> str
Convert RGB to ANSI-16 color escape sequence to change foreground color.
This function is not exported by default, but exportable.
Arguments ('*' denotes required arguments):
· $color* => color::rgb24
Return value: (str)
rgb_to_ansi24b_bg_code
Usage:
rgb_to_ansi24b_bg_code($color) -> str
Convert RGB to ANSI 24bit-color escape sequence to change background color.
This function is not exported by default, but exportable.
Arguments ('*' denotes required arguments):
· $color* => color::rgb24
Return value: (str)
rgb_to_ansi24b_fg_code
Usage:
rgb_to_ansi24b_fg_code($color) -> str
Convert RGB to ANSI 24bit-color escape sequence to change foreground color.
This function is not exported by default, but exportable.
Arguments ('*' denotes required arguments):
· $color* => color::rgb24
Return value: (str)
rgb_to_ansi256
Usage:
rgb_to_ansi256($color) -> color::ansi256
Convert RGB to ANSI-256 color.
This function is not exported by default, but exportable.
Arguments ('*' denotes required arguments):
· $color* => color::rgb24
Return value: (color::ansi256)
rgb_to_ansi256_bg_code
Usage:
rgb_to_ansi256_bg_code($color) -> str
Convert RGB to ANSI-256 color escape sequence to change background color.
This function is not exported by default, but exportable.
Arguments ('*' denotes required arguments):
· $color* => color::rgb24
Return value: (str)
rgb_to_ansi256_fg_code
Usage:
rgb_to_ansi256_fg_code($color) -> str
Convert RGB to ANSI-256 color escape sequence to change foreground color.
This function is not exported by default, but exportable.
Arguments ('*' denotes required arguments):
· $color* => color::rgb24
Return value: (str)
rgb_to_ansi_bg_code
Usage:
rgb_to_ansi_bg_code($color) -> str
Convert RGB to ANSI color escape sequence to change background color.
Autodetect terminal capability and can return either empty string, 16-color, 256-color, or
24bit-code.
Which color depth used is determined by "COLOR_DEPTH" environment setting or from
Term::Detect::Software if that module is available). In other words, this function
automatically chooses rgb_to_ansi{24b,256,16}bgcode().
This function is not exported by default, but exportable.
Arguments ('*' denotes required arguments):
· $color* => color::rgb24
Return value: (str)
rgb_to_ansi_fg_code
Usage:
rgb_to_ansi_fg_code($color) -> str
Convert RGB to ANSI color escape sequence to change foreground color.
Autodetect terminal capability and can return either empty string, 16-color, 256-color, or
24bit-code.
Color depth used is determined by "COLOR_DEPTH" environment setting or from
Term::Detect::Software if that module is available. In other words, this function
automatically chooses rgb_to_ansi{24b,256,16}fgcode().
This function is not exported by default, but exportable.
Arguments ('*' denotes required arguments):
· $color* => color::rgb24
Return value: (str)
ansi16fg($rgb) => STR
Alias for rgb_to_ansi16_fg_code().
ansi16bg($rgb) => STR
Alias for rgb_to_ansi16_bg_code().
ansi256fg($rgb) => STR
Alias for rgb_to_ansi256_fg_code().
ansi256bg($rgb) => STR
Alias for rgb_to_ansi256_bg_code().
ansi24bfg($rgb) => STR
Alias for rgb_to_ansi24b_fg_code().
ansi24bbg($rgb) => STR
Alias for rgb_to_ansi24b_bg_code().
rgb_to_ansi_fg_code($rgb) => STR
ansifg($rgb) => STR
Alias for rgb_to_ansi_fg_code().
ansibg($rgb) => STR
Alias for rgb_to_ansi_bg_code().
ansi_reset( [ $conditional ])
Returns "\e[0m", which is the ANSI escape sequence to reset color. Normally you print this
sequence after you print colored text.
If $conditional is set to true, then ansi_reset() will return "" if color is disabled.
ENVIRONMENT
NO_COLOR
Can be used to explicitly disable color. See <https://no-color.org> for more details.
Observed by: ansi{fg,bg}.
COLOR => bool
Can be used to explicitly disable color by setting it to 0.
Observed by: ansi{fg,bg}.
COLOR_DEPTH => INT
Can be used to explicitly set color depth instead of trying to detect appropriate color
depth.
Observed by: ansi{fg,bg}.
HOMEPAGE
Please visit the project's homepage at <https://metacpan.org/release/Color-ANSI-Util>.
SOURCE
Source repository is at <https://github.com/perlancar/perl-Color-ANSI-Util>.
BUGS
Please report any bugs or feature requests on the bugtracker website
<https://rt.cpan.org/Public/Dist/Display.html?Name=Color-ANSI-Util>
When submitting a bug or request, please include a test-file or a patch to an existing
test-file that illustrates the bug or desired feature.
SEE ALSO
Term::ANSIColor
<http://en.wikipedia.org/wiki/ANSI_escape_code>
AUTHOR
perlancar <perlancar@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013 by
perlancar@cpan.org.
This is free software; you can redistribute it and/or modify it under the same terms as
the Perl 5 programming language system itself.