64 lines
995 B
Text
64 lines
995 B
Text
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#!/usr/bin/env perl
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use strict;
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use warnings;
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use feature 'say';
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use utf8;
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use open qw(:std :utf8);
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my $WIDTH_DEFAULT = 80;
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my $WIDTH = $ARGV[0] || $WIDTH_DEFAULT;
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sub main {
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my $buf = '';
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while (my $line = <STDIN>) {
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if ($line =~ /^\s+$/) {
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say $buf;
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say '' if ($buf);
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$buf = '';
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next;
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}
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if ($buf) {
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$line = $buf . $line;
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}
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my ($head, $tail) = handle_str($line);
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say $head;
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$buf = handle_buf($tail);
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}
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say $buf if $buf;
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}
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sub handle_buf {
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my $buf = shift;
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my $len = length($buf);
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if ($len == $WIDTH) {
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say $buf;
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return '';
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}
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if ($len < $WIDTH) {
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return $buf;
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}
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## $len > $WIDTH
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my ($head, $tail) = handle_str($buf);
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say $head;
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handle_buf($tail);
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}
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sub handle_str {
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my $str = shift;
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if ($str =~ m/^(.{0,$WIDTH})\s(.*)$/) {
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return ($1, $2);
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}
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## no spaces here: 0..$WIDTH
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if ($str =~ m/^(\S*)\s(.*)$/) {
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return ($1, $2);
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}
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## no whitespace at all
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if ($str =~ m/^(\S+)$/) {
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return ($1, '');
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}
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die "ooops!";
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}
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main();
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