Source of common.inc.plp

<:
use utf8;
use strict;
use warnings;
no  warnings 'qw';  # you know what you doing
no  warnings 'uninitialized';  # save some useless checks for more legible code
use open ':std' => ':utf8';

use File::stat 'stat';
use HTTP::Date;
use Shiar_Sheet::KeySigns qw(%sign);  # dependant on $get{ascii}

our $style;
our $showkeys = !exists $get{keys} ? undef :
	($get{keys} ne '0' && ($get{keys} || 'always'));

$header{content_type} = 'text/html; charset=utf-8';

sub stylesheet {
	my %styles = map {$_ => $_} @_;

	if (exists $get{style}) {
		$style = $styles{ $get{style} };
		require CGI::Cookie;
		AddCookie(CGI::Cookie->new(
			-name    => 'style',
			-value   => $style,
			-path    => '/',  # site-wide; current page is confusing to most users
			-expires => $style ? '+5y' : '-1d',
		)->as_string);
	}

	$style ||= exists $cookie{style} && $styles{ $cookie{style} } || $_[0];

	return join "\n", map { sprintf(
		'<link rel="%s" type="text/css" media="all" href="%s" title="%s">',
		$_ eq $style ? 'stylesheet' : 'alternate stylesheet', "/$_.css", $_
	) } @_;
}

sub checkmodified {
	my $lastmod;
	for (@_) {
		my $mod = stat $_ or next;
		$mod = $mod->mtime or next;
		$lastmod = $mod if $mod gt $lastmod;
	}

	for ($ENV{HTTP_IF_MODIFIED_SINCE} || ()) {
		next if str2time($_) < $lastmod;
		$header{status} = '304 Same old';
		exit;
	}

	$header{'Last-Modified'} = time2str($lastmod);
}

sub Html {
	my ($meta) = @_;

	# announce and check data modification
	checkmodified(
		$ENV{SCRIPT_FILENAME},
		(grep { /\bShiar_/ } values %INC),
		$meta->{data} ? @{ $meta->{data} } : (),
	);

	# default fallbacks
	$meta->{stylesheet} ||= [qw'light dark circus mono red terse'];
	$meta->{charset} ||= 'utf-8';

	# optional amends
	push @{ $meta->{raw} }, (
		'<!--[if lte IE 6]><style> .help dl.legend dt {margin:0 0 1px} </style><![endif]-->',
		'<!--[if lte IE 7]><style> .help dl.legend dd {float:none} </style><![endif]-->',
		!$showkeys ? '<style type="text/css"> .no {visibility:hidden} </style>'
			: $showkeys eq 'ghost' ? '<style type="text/css"> .no, .alias {opacity:.5} </style>'
			: (),
		'<script type="text/javascript" src="/keys.js"></script>',
	) if $meta->{keys};

	# flatten arrays
	ref $_ eq 'ARRAY' and $_ = join ' ',  @$_ for $meta->{description};
	ref $_ eq 'ARRAY' and $_ = join ', ', @$_ for $meta->{keywords};
	ref $_ eq 'ARRAY' and $_ = join "\n", @$_ for $meta->{rawstyle}, $meta->{raw};
	ref $_ eq 'ARRAY' and $_ = stylesheet(@$_)."\n" for $meta->{stylesheet};

	# other vars
	my $sep = $meta->{charset} eq 'utf-8' ? '•' : ' -- ';
	my ($file) = $ENV{SCRIPT_FILENAME} =~ m{ ([^/]+) \.plp$ }x;

	# leading output
	$header{content_type} = "text/html; charset=$meta->{charset}";
	print <<"EOT";
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
 "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">

<head>
<meta http-equiv="content-type" content="$header{content_type}">
<title>$meta->{title}</title>
<meta name="description" content="$meta->{description}">
<meta name="keywords" content="$meta->{keywords}">
<link rel="icon" type="image/png" href="/clip.png">
EOT
	print $_, "\n" for $meta->{stylesheet} || ();
	print $_, "\n" for $meta->{raw} || ();
	print qq{</head>\n\n<body id="$file">\n};

	# prepare trailing output
	PLP_END {
		print <<"EOT";
<p class="footer">
	<a href="/" rel="start">sheet.shiar.nl</a>/$file.<a href="/source/$file.plp"
	 rel="code" title="Written in Perl">plp</a>
	<a href="http://git.shiar.nl/sheet.git/history/HEAD:/$file.plp"
	 rel="vcs-git" title="Git repository">$meta->{version}</a>
	created by <a href="http://shiar.nl/" rel="author">Shiar</a> $sep
	<a href="http://www.fsf.org/licensing/licenses/agpl-3.0.html" rel="copyright"
	 title="Licensed under the GNU Affero General Public License, version 3">AGPLv3</a>
</p>

</html>
EOT
	};
}