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Text-ANSI-Fold-0.06
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NAME

Text::ANSI::Fold - Text folding with ANSI sequence and Asian wide characters.

SYNOPSIS

use Text::ANSI::Fold qw(ansi_fold);
($folded, $remain) = ansi_fold($text, $width, [ option ]);

use Text::ANSI::Fold;
my $f = new Text::ANSI::Fold width => 80, boundary => 'word';
$f->configure(ambiguous => 'wide');
($folded, $remain) = $f->fold($text);

use Text::ANSI::Fold;
while (<>) {
    print join "\n",
        Text::ANSI::Fold->new(width => 40, text => $_)->chops;
}

DESCRIPTION

Text::ANSI::Fold provides capability to fold a text into two strings by given width. Text can include ANSI terminal sequences. If the text is divided in the middle of ANSI-effect region, reset sequence is appended to folded text, and recover sequence is prepended to trimmed string.

This module also support Unicode Asian full-width and non-spacing combining characters properly.

Use exported ansi_fold function to fold original text, with number of visual columns you want to cut off the text. Width parameter have to be a number greater than zero.

($folded, $remain, $w) = ansi_fold($text, $width);

It returns a pair of strings; first one is folded text, and second is the rest.

Additional third result is the visual width of folded text. You may want to know how many columns returned string takes for further processing.

This function returns at least one character in any situation. If you provide Asian wide string and just one column as width, it trims off the first wide character even if it does not fit to given width.

Default parameter can be set by configure class method:

Text::ANSI::Fold->configure(width => 80, padding => 1);

Then you don't have to pass second argument.

($folded, $remain) = ansi_fold($text);

Because second argument is always taken as width, use undef when using default width with additional parameter:

($folded, $remain) = ansi_fold($text, undef, padding => 1);

OBJECT INTERFACE

You can create an object to hold parameters, which is effective during object life time. For example,

my $f = new Text::ANSI::Fold
    width => 80,
    boundary => 'word';

makes an object folding on word boundaries with 80 columns width. Then you can use this without parameters.

$f->fold($text);

Use configure method to update parameters:

$f->configure(padding => 1);

Additional parameter can be specified on each call, and they precede saved value.

$f->fold($text, width => 40);

STRING OBJECT INTERFACE

Fold object can hold string inside by text method.

$f->text("text");

And folded string can be taken by retrieve method. It returns empty string if nothing remained.

while ((my $folded = $f->retrieve) ne '') {
    print $folded;
    print "\n" if $folded !~ /\n\z/;
}

Method chops returns chopped string list. Because text method returns the object itself, you can use text and chops like this:

print join "\n", $f->text($text)->chops;

Actually, text can be set by new or configure method through text option. Next program just works.

use Text::ANSI::Fold;
while (<>) {
    print join "\n",
        Text::ANSI::Fold->new(width => 40, text => $_)->chops;
}

When using chops method, width parameter can take array reference, and chops text into given width list.

my $fold = new Text::ANSI::Fold;
my @list = $fold->text("1223334444")->chops(width => [ 1, 2, 3 ]);
# return ("1", "22", "333") and keep "4444"

OPTIONS

Option parameter can be specified as name-value list for ansi_fold function as well as new and configure method.

ansi_fold($text, $width, boundary => 'word', ...);

Text::ANSI::Fold->configure(boundary => 'word');

my $f = new Text::ANSI::Fold boundary => 'word';

$f->configure(boundary => 'word');

SEE ALSO

LICENSE

Copyright (C) 2018- Kazumasa Utashiro.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR