package Text::ANSI::Util;
our $DATE = '2016-03-11'; # DATE
our $VERSION = '0.22'; # VERSION
use 5.010001;
use strict 'subs', 'vars';
use warnings;
require Exporter;
our @ISA = qw(Exporter);
our @EXPORT_OK = qw(
ta_add_color_resets
ta_detect
ta_extract_codes
ta_highlight
ta_highlight_all
ta_length
ta_length_height
ta_pad
ta_split_codes
ta_split_codes_single
ta_strip
ta_substr
ta_trunc
ta_wrap
);
use Text::ANSI::BaseUtil ();
our $re = $Text::ANSI::BaseUtil::re;
*{$_} = \&{"Text::ANSI::BaseUtil::$_"} for @EXPORT_OK;
1;
# ABSTRACT: Routines for text containing ANSI color codes
__END__
=pod
=encoding UTF-8
=head1 NAME
Text::ANSI::Util - Routines for text containing ANSI color codes
=head1 VERSION
This document describes version 0.22 of Text::ANSI::Util (from Perl distribution Text-ANSI-Util), released on 2016-03-11.
=head1 SYNOPSIS
use Text::ANSI::Util qw(
ta_add_color_resets
ta_detect
ta_extract_codes
ta_highlight
ta_highlight_all
ta_length
ta_length_height
ta_pad
ta_split_codes
ta_split_codes_single
ta_strip
ta_substr
ta_trunc
ta_wrap
);
# detect whether text has ANSI color codes?
say ta_detect("red"); # => false
say ta_detect("\e[31mred"); # => true
# calculate length of text (excluding the ANSI color codes)
say ta_length("red"); # => 3
say ta_length("\e[31mred"); # => 3
# strip ANSI color codes
say ta_strip("\e[31mred"); # => "red"
# split codes (ANSI color codes are always on the even positions)
my @parts = ta_split_codes("\e[31mred"); # => ("", "\e[31m", "red")
# wrap text to a certain column width, handle ANSI color codes
say ta_wrap("....", 40);
# pad (left, right, center) text to a certain width
say ta_pad("foo", 10); # => "foo "
say ta_pad("foo", 10, "left"); # => " foo"
say ta_pad("foo\nbarbaz\n", 10, "center", "."); # => "...foo....\n..barbaz..\n"
# truncate text to a certain width while still passing ANSI color codes
use Term::ANSIColor;
my $text = color("red")."red text".color("reset"); # => "\e[31mred text\e[0m"
say ta_trunc($text, 5); # => "\e[31mred t\e[0m"
# highlight the first occurence of some string within text
say ta_highlight("some text", "ome", "\e[7m\e[31m");
# ditto, but highlight all occurrences
say ta_highlight_all(...);
# get substring
my $substr = ta_substr("...", $pos, $len);
# return text but with substring replaced with replacement
say ta_substr("...", $pos, $len, $replacement);
=head1 DESCRIPTION
This module provides routines for dealing with text that contains ANSI color
codes, e.g. for determining its length/width (excluding the color codes),
stripping the color codes, extracting the color codes, and so on.
For functions that support wide characters, see L<Text::ANSI::WideUtil>.
Current caveats:
=over
=item * Other ANSI codes (non-color codes) are ignored
These are codes like for altering cursor positions, etc.
=item * Single-character CSI (control sequence introducer) currently ignored
Only C<ESC+[> (two-character CSI) is currently parsed.
BTW, in ASCII terminals, single-character CSI is C<0x9b>. In UTF-8 terminals, it
is C<0xc2, 0x9b> (2 bytes).
=item * Private-mode- and trailing-intermediate character currently not parsed
=item * Only color reset code \e[0m is recognized
For simplicity, currently multiple SGR parameters inside a single ANSI color
code is not parsed. This means that color reset code like C<\e[1;0m> or
C<\e[31;47;0m> is not recognized, only C<\e[0m> is. I believe this should not be
a problem with most real-world text out there.
=back
=head1 FUNCTIONS
=head2 ta_add_color_resets(@text) => LIST
Make sure that a color reset command (add C<\e[0m>) to the end of each element
and a replay of all the color codes from the previous element, from the last
color reset) to the start of the next element, and so on. Return the new list.
This makes each element safe to be combined with other array of text into a
single line, e.g. in a multicolumn/tabular layout. An example:
Without color resets:
my @col1 = split /\n/, "\e[31mred\nmerah\e[0m";
my @col2 = split /\n/, "\e[32mgreen\e[1m\nhijau tebal\e[0m";
printf "%s | %s\n", $col1[0], $col2[0];
printf "%s | %s\n", $col1[1], $col2[1];
the printed output:
\e[31mred | \e[32mgreen
merah\e[0m | \e[1mhijau tebal\e[0m
The C<merah> text on the second line will become green because of the effect of
the last color command printed (C<\e[32m>). However, with ta_add_color_resets():
my @col1 = ta_add_color_resets(split /\n/, "\e[31mred\nmerah\e[0m");
my @col2 = ta_add_color_resets(split /\n/, "\e[32mgreen\e[1m\nhijau tebal\e[0m");
printf "%s | %s\n", $col1[0], $col2[0];
printf "%s | %s\n", $col1[1], $col2[1];
the printed output (C<< <...> >>) marks the code added by ta_add_color_resets():
\e[31mred<\e[0m> | \e[32mgreen\e[1m<\e[0m>
<\e[31m>merah\e[0m | <\e[32m\e[1m>hijau tebal\e[0m
All the cells are printed with the intended colors.
=head2 ta_detect($text) => BOOL
Return true if C<$text> contains ANSI color codes, false otherwise.
=head2 ta_extract_codes($text) => STR
This is the opposite of C<ta_strip()>, return only the ANSI codes in C<$text>.
=head2 ta_highlight($text, $needle, $color) => STR
Highlight the first occurence of C<$needle> in C<$text> with <$color>, taking
care not to mess up existing colors.
C<$needle> can be a string or a Regexp object.
Implementation note: to not mess up colors, we save up all color codes from the
last reset (C<\e[0m>) before inserting the highlight color + highlight text.
Then we issue C<\e[0m> and the saved up color code to return back to the color
state before the highlight is inserted. This is the same technique as described
in C<ta_add_color_resets()>.
=head2 ta_highlight_all($text, $needle, $color) => STR
Like C<ta_highlight()>, but highlight all occurences instead of only the first.
=head2 ta_length($text) => INT
Count the number of characters in $text, while ignoring ANSI color codes.
Equivalent to C<< length(ta_strip($text)) >>. See also: C<ta_mbswidth()> in
L<Text::ANSI::WideUtil>.
=head2 ta_length_height($text) => [INT, INT]
Like C<ta_length()>, but also gives height (number of lines). For example, C<<
ta_length_height("foobar\nb\n") >> gives C<[6, 3]>.
See also: C<ta_mbswidth_height()> in L<Text::ANSI::WideUtil>.
=head2 ta_pad($text, $width[, $which[, $padchar[, $truncate]]]) => STR
Return C<$text> padded with C<$padchar> to C<$width> columns. C<$which> is
either "r" or "right" for padding on the right (the default if not specified),
"l" or "left" for padding on the right, or "c" or "center" or "centre" for
left+right padding to center the text.
C<$padchar> is whitespace if not specified. It should be string having the width
of 1 column.
Does *not* handle multiline text; you can split text by C</\r?\n/> yourself.
See also: C<ta_mbpad()> in L<Text::ANSI::WideUtil>.
=head2 ta_split_codes($text) => LIST
Split C<$text> to a list containing alternating ANSI color codes and text. ANSI
color codes are always on the second element, fourth, and so on. Example:
ta_split_codes(""); # => ()
ta_split_codes("a"); # => ("a")
ta_split_codes("a\e[31m"); # => ("a", "\e[31m")
ta_split_codes("\e[31ma"); # => ("", "\e[31m", "a")
ta_split_codes("\e[31ma\e[0m"); # => ("", "\e[31m", "a", "\e[0m")
ta_split_codes("\e[31ma\e[0mb"); # => ("", "\e[31m", "a", "\e[0m", "b")
ta_split_codes("\e[31m\e[0mb"); # => ("", "\e[31m\e[0m", "b")
so you can do something like:
my @parts = ta_split_codes($text);
while (my ($text, $ansicode) = splice(@parts, 0, 2)) {
...
}
=head2 ta_split_codes_single($text) => LIST
Like C<ta_split_codes()> but each ANSI color code is split separately, instead
of grouped together. This routine is currently used internally e.g. for
C<ta_wrap()> and C<ta_highlight()> to trace color reset/replay codes.
=head2 ta_strip($text) => STR
Strip ANSI color codes from C<$text>, returning the stripped text.
=head2 ta_substr($text, $pos, $len[ , $replacement ]) => STR
A bit like Perl's C<substr()>. If C<$replacement> is not specified, will return
the substring. If C<$replacement> is specified, will return $text with the
substring replaced by C<$replacement>.
See also: C<ta_mbsubstr()> in L<Text::ANSI::WideUtil>.
=head2 ta_trunc($text, $width) => STR
Truncate C<$text> to C<$width> columns while still including all the ANSI color
codes. This ensures that truncated text still reset colors, etc.
Does *not* handle multiline text; you can split text by C</\r?\n/> yourself.
See also: C<ta_mbtrunc()> in L<Text::ANSI::WideUtil>.
=head2 ta_wrap($text, $width, \%opts) => STR
Like L<Text::WideChar::Util>'s C<wrap()> except handles ANSI color codes.
Perform color reset at the end of each line and a color replay at the start of
subsequent line so the text is safe for combining in a multicolumn/tabular
layout.
Options:
=over
=item * flindent => STR
First line indent. See Text::WideChar::Util for more details.
=item * slindent => STR
First line indent. See Text::WideChar::Util for more details.
=item * tab_width => INT (default: 8)
First line indent. See Text::WideChar::Util for more details.
=item * pad => BOOL (default: 0)
If set to true, will pad each line to C<$width>. This is convenient if you need
the lines padded, saves calls to ta_pad().
=item * return_stats => BOOL (default: 0)
If set to true, then instead of returning the wrapped string, function will
return C<< [$wrapped, $stats] >> where C<$stats> is a hash containing some
information like C<max_word_width>, C<min_word_width>.
=back
Performance: ~500/s on my Core i5 1.7GHz laptop for a ~1KB of text (with zero to
moderate amount of color codes).
See also: C<ta_mbwrap()> in L<Text::ANSI::WideUtil>.
=head1 FAQ
=head2 How do I highlight a string case-insensitively?
You can currently use a regex for the C<$needle> and use the C<i> modifier.
Example:
use Term::ANSIColor;
ta_highlight($text, qr/\b(foo)\b/i, color("bold red"));
=head1 HOMEPAGE
Please visit the project's homepage at L<https://metacpan.org/release/Text-ANSI-Util>.
=head1 SOURCE
Source repository is at L<https://github.com/perlancar/perl-Text-ANSI-Util>.
=head1 BUGS
Please report any bugs or feature requests on the bugtracker website L<https://rt.cpan.org/Public/Dist/Display.html?Name=Text-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.
=head1 SEE ALSO
L<Text::ANSI::WideUtil>
=head1 AUTHOR
perlancar <perlancar@cpan.org>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2016 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.
=cut