G'day immamanatee,
Welcome to the monastery.
You're reading your data an inordinate amount of times:
-
Read all input into $text using slurp mode ($/ = undef).
-
Read all data to generate @url_list.
-
Read all data to remove URL lines.
-
Read all remaining lines in an outer loop.
-
Read each line in an inner loop to generate link numbers.
-
Read the entire @url_list in every pass through the inner loop.
As you're dealing with paragraphs, consider reading your input as paragraphs and processing it just once:
-
Read all input into an array using paragraph mode ($/ = '').
-
Create a hash, mapping link number to URL, using just the last paragraph of text.
-
Loop through all but the last paragraph, printing each paragraph and any associated footnotes.
Here's an example using your data:
#!/usr/bin/env perl -l
use strict;
use warnings;
my @data = do { local $/ = ''; <DATA> };
my %urls = map { /^\[(\d+)/ => $_ } split /^/ => $data[-1];
print $data[$_], @urls{$data[$_] =~ /\[.*?\]\[(\d+)\]/g} for 0 .. $#da
+ta - 1;
__DATA__
This is a an example of [Markdown][1] footer links. I'm trying to use
+[Perl][2] to organize them more coherently.
But I'm getting too many newlines and I'm hoping the [PerlMonks][3] ca
+n help.
[1]: https://daringfireball.net/projects/markdown/
[2]: http://www.perl.org/
[3]: http://www.perlmonks.org/
Output:
This is a an example of [Markdown][1] footer links. I'm trying to use
+[Perl][2] to organize them more coherently.
[1]: https://daringfireball.net/projects/markdown/
[2]: http://www.perl.org/
But I'm getting too many newlines and I'm hoping the [PerlMonks][3] ca
+n help.
[3]: http://www.perlmonks.org/