Color::ANSI::Util

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 <[email protected]>

COPYRIGHT AND LICENSE

This software is copyright (c) 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013 by [email protected]. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.