Source of source.plp

<(common.inc.plp)><:

my $source = $Request;

if ($source =~ s{(?<=\Q.inc.pl\E)/jsonp?$}{} and -r $source) {
	# convert perl include to json construct
	checkmodified($source);
	eval {
		my $data = do $source or die $@ || $! || 'read error';
		require JSON;
		my $converter = JSON->new;
		$converter->utf8->indent->space_after->canonical;

		$header{content_type} = 'application/json';
		$header{content_type} = 'text/plain' if exists $get{debug};
		print $_, '(' for $get{callback} // ();
		print $converter->encode($data);
		print     ')' for $get{callback} // ();
		return 1;
	} or do {
		$header{status} = '500 File unavailable';
		$header{content_type} = 'text/plain';
		print "Conversion failed: $@";
	};
	exit;
}

Html({
	title => "$source source code",
	version => '1.1',
	description => !$source ? 'Index of source files for this site.' : [
		"Source code of the $source file at this site,",
		"with syntax highlighted and references linked."
	],
	keywords => [qw'
		sheet cheat source code perl plp html agpl
	'],
	stylesheet => [qw'light dark mono red'],
});

say '';

if (not $source) {
	print "<h1>Source files</h1>";

	print "<p>Project code distributed under the AGPL. Please contribute back.</p>";
	say '<ul>';
	for (glob '*.plp') {
		chomp;
		say '<li>', showlink($_, "/source/$_");
	}
	say "</ul>\n";
}
else {
	say "<h1>Source of $source</h1>";

	if ($source =~ m{(?:/|^)\.}) {
		die "File request not permitted\n";
	}
	elsif ($source =~ s{::}{/}g or !-e $source) {
		$source .= '.pm';
		for (0 .. $#INC) {
			-e ($_ = "$INC[$_]/$source") or next;
			$source = $_;
			last;
		}
	}
	-r $source or die "Requested file not found\n";
	my $size = (stat $source)->[7];

	if (my $hl = eval {
		$size < 32_768 or die 'large files take too long to parse';
		require Text::VimColor;
		Text::VimColor->VERSION(0.12)
			or die 'early versions are buggy under FastCGI';
		delete $Text::VimColor::SYNTAX_TYPE{Underlined};
		return Text::VimColor->new(
			file => $source,
			vim_options => [@Text::VimColor::VIM_OPTIONS, '+:set enc=utf-8'],
		)->marked;
	}) {
		my %TYPETAG = (
			Statement => 'strong',
			Error     => 'em',
			Todo      => 'em',
		);

		say '<pre>';
		foreach (@{$hl}) {
			my ($type, $contents) = @{$_};
			$contents = decode_utf8($contents);
			my $tag = $type && ($TYPETAG{$type} || 'span');
			my $arg = '';
			print "<$tag$arg class=\"sy-\l$type\">" if $tag;
			if (!$type || $type eq 'Constant'
			and $contents =~ s{^(['"]?)([/a-z0-9_.-]+\.(?:plp?|css|js))(?=\1$)}{}) {
				# link other page sources, stylesheets, and javascript
				print $1 . showlink($2, "/source/$2");
			}
			if (!$type and $contents =~ s/^(\s*)([A-Z]\w+(?:::\w+)+)(?![^;\s])//) {
				# link perl module names (Xx::Xx...)
				print $1 . showlink($2, "/source/$2");
			}
			if ($type && $type eq 'Comment'
			and $contents =~ s{^(.*? by )(tools/\S+)}{}) {
				# link generator scripts (by tools/...)
				print $1 . showlink($2, "/source/$2");
			}
			print Text::VimColor::_xml_escape($contents);
			print "</$tag>" if $tag;
		}
		say '</pre>';
	}
	else {
		say '<pre>';
		print EscapeHTML(decode_utf8(ReadFile($source)));
		say '</pre>';
	}

	say '';
}