use Text::Paragraphs;
unit module Text::Wrap;

role WrapMode {};  class KeepParagraphs does WrapMode {};
                   class KeepNewlines   does WrapMode {};
                   class ReflowAll      does WrapMode {};

sub wrap-paragraph(Str $_, :$max-len, :$prefix) {
    m• ^ $<prefix>=[ \s* ]    $<body>=[ .*? ]    $<postfix>=[ \s* ] $ •;

    my (&len, $paragraph-prefix) = (&display-length, $prefix || ~$<prefix>);
    my $line-len = len $prefix;

    sub wrap-words-to-lines(@lines, $text ($word, $ws='')) {
        my $prefix = ~($paragraph-prefix ~~ /\n*<(\V*)>/);

        my @next-lines = gather if $line-len+len($word) ≤ $max-len {
                                       $line-len += len $word~$ws;
                                       take "@lines.tail()$word$ws" }
                                else { $line-len = len $prefix~$word~$ws;
                                       take @lines.tail.trim-trailing;
                                       take "$prefix$word$ws" }
        [ |@lines.head(*-1), |@next-lines ] }

    my @words =  $<body>.trans("\n" => ' ', :s).comb(/\S+|\s+/).batch(2);
    $paragraph-prefix ~([''], |@words).reduce(&wrap-words-to-lines).join("\n") ~ $<postfix>
}

our proto wrap-words(|) is export  {*}
multi wrap-words( Str $_, Int :length($max-len)=80, Int :$indent=0, Str :$prefix=' 'x $indent,
                  |modes (Bool :$keep-paragraphs

False


    (do  if $mode === KeepNewlines   { .trim-leading.lines(:!chomp) }
      elsif $mode === ReflowAll      { .trans("\n" => "\n", :s).lines(:!chomp)».trim-leading.join}
      elsif $mode === KeepParagraphs { .trim-leading.&paragraphs: :!chomp})
    ==> map({.&wrap-paragraph(:$max-len:$prefix)})
    ==> join('')
}

#| Estimates a Str's display width.  This is in theory impossible (it depends on the font) but in practice
#| it typically works (most fonts behave reasonably).  See https://stackoverflow.com/questions/3634627
#| Note: Raku removes many 0-width codepoints for us by combining them during the NFC normalization
sub display-length($_) is pure {
   sum .comb.map: { when 0x1160 ≤ .ord ≤ 0x11FF                { 0 } # Hangul Jamo medial vowels
                    when .uniprop('EastAsianWidth') eq 'W'|'F' { 2 }
                    default                                    { 1 }}}


root

README

React

=begin React :component<HeaderCol> :id<menu> 
=para L<Documentation|/doc/introduction>
=para L<Modules| /mods>
=para L<Examples| file:../examples/index.podlite>
=para L<Download |file:../download/index.podlite>
=para L<About|file:../about/index.podlite>
=para 🔍 K<⌘K>/K<ctrl-K>
=end React


=begin React :component<HeaderCol> :id<footer>  
=begin nested :!nested
=item1 B<Language>
    =item2 L<Get started|file:../getting-started/getting-started.podlite>
    =item2 L<Why Raku?|/doc/language/faq#Why-should-I-learn-Raku-What's-so-great-about-it>
    =item2 L<Try Raku|https://glot.io/new/raku>
    =item2 L<Raku cheat sheet|https://github.com/Raku/mu/blob/master/docs/Perl6/Cheatsheet/cheatsheet.txt>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<Raku on Exercism|https://exercism.org/tracks/raku>
    =item2 L<Wikipedia|https://en.wikipedia.org/wiki/Raku_(programming_language)>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=end nested
=begin nested :!nested

=item1 B<L<Documentation|/doc>>
    =item2 L<Getting started, Migration guides from other languages, & Tutorials | file:../doc/introduction.podlite>
    =item2 L<Language References|file:../doc/reference.podlite>
    =item2 L<Type Reference| file:../doc/types.podlite>
    =item2 L<Miscellaneous| file:../doc/miscellaneous.podlite>
    =item2 L<FAQs (Frequently Asked Questions)|/doc/language/faq>
    =item2 L<Community|/doc/language/community>
    =item2 L<The list of all documents|file:../doc/index.podlite>

=item1 B<Resources>
    =item2 L<The Raku Guide|https://raku.guide/>
    =item2 L<Books |https://perl6book.com/>
    =item2 L<Rosetta Code | https://www.raku.org/community/rosettacode>

=end nested
=begin nested :!nested

=item1 B<Resoures>
    =item2 L<Download | file:../download/index.podlite>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=item1 B<Learning>
    =item2 L<The Raku Guide|https://raku.guide/>
    =item2 L<Wikibook |https://en.wikibooks.org/wiki/Raku_Programming>
    =item2 L<Books |https://perl6book.com/>
    =item2 L<Rosetta Code | https://www.raku.org/community/rosettacode>
    =item2 L<Learn Raku in Y minutes|https://learnxinyminutes.com/docs/raku/>
    =item2 L<Golfing |https://github.com/AlexDaniel/raku-golf-cheatsheet>
=end nested
=begin nested :!nested

=item1 B<Explore>
    =item2 L<Raku Blog Aggregator|https://planet.raku.org/>
    =item2 L<Rakudo Weekly|https://rakudoweekly.blog/>
    =item2 L<The Weekly Challenge |https://perlweeklychallenge.org/>
    =item2 L<Raku Advent Calendar|https://raku-advent.blog/>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=end nested
=end React


=begin React :component<CookieConsent> :id<CookieConsent> :buttonCaption("Got it!")
=para
This website uses cookies for analytics.
=end React


Wrap

_ v0.0.1

Authors

License

Dependencies

Test Dependencies

Provides

Documentation