build-aux/txt2pre

   1 #!/usr/bin/env perl
   2 # Copyright (C) 2015-2020 all contributors <cmogstored-public@yhbt.net>
   3 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
   4 #
   5 # Stupid script to make HTML from preformatted, utf-8 text versions,
   6 # only generating links for http(s).  Markdown does too much
   7 # and requires indentation to output preformatted text.
   8 use strict;
   9 use warnings;
  10 use Encode qw/encode/;
  11 my $file = shift;
  12 my $str;
  13 if (defined $file) {
  14         open my $fh, '<', $file or die "failed to open $file: $!\n";
  15         local $/;
  16         $str = <$fh>;
  17 } else {
  18         $str = eval { local $/; <> };
  19 }
  20 my %xhtml_map = (
  21         '"' => '&#34;',
  22         '&' => '&#38;',
  23         "'" => '&#39;',
  24         '<' => '&lt;',
  25         '>' => '&gt;',
  26 );
  27 $str =~ s/([<>&'"])/$xhtml_map{$1}/ge;
  28 $str = encode('us-ascii', $str, Encode::HTMLCREF);
  29 my ($title) = ($str =~ /\A([^\n]+)\n[^a-zA-Z]*\n/s);
  30
  31 unless (defined $title) {
  32         $title = $file;
  33         $title =~ s,\A[^/]*/,,;
  34         $title = "cmogstored - $title";
  35 }
  36
  37 # temporarily swap &gt; for escape so our s!! to add href works.
  38 # there's probably a way to do this with only a single s!! ...
  39 $str =~ s!&gt;!\e!g;
  40 $str =~ s!\b((nntps?|ftp|https?|imaps?)://[\w+\+\&\?\.\%\;/#=\!\@-]+)!<a
  41 href="$1"\n>$1</a>!g;
  42
  43 $str =~ s!\e!&gt;!g; # swap escapes back to &gt;
  44
  45 print '<html><head>',
  46   '<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />',
  47   "<title>$title</title>",
  48   "</head><body>\n<pre>",  $str , '</pre></body></html>';