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;

$PLP::ERROR = sub {
	my ($text, $html) = @_;
	print '<p class="error"><strong>Fatal error</strong>: '.$html."</p>\n\n";
};

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 (defined( my $setstyle = $get{style} )) {
		$style = $styles{ $setstyle };
		eval {
			require CGI::Cookie;
			my $cookie = CGI::Cookie->new(
				-name    => 'style',
				-value   => $setstyle || '',
				-path    => '/',  # site-wide; current page is confusing to most users
				-expires => $setstyle ? '+5y' : '-1d',
			) or die "empty object returned\n";
			AddCookie($cookie->as_string);
		} or warn "Unable to create style cookie: $@";
	}

	$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?1.9", $_
	) } @_;
}

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} } : (),
	);
	$header{'Cache-Control'} = sprintf 'max-age: ', 24*60*60;

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

	ref $_ eq 'ARRAY' or $_ = [$_] for $meta->{raw};

	# 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?1.6"></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->{raw};
	ref $_ eq 'ARRAY' and $_ = stylesheet(@$_)."\n" for $meta->{stylesheet};

	# other vars
	my ($file) = $ENV{SCRIPT_FILENAME} =~ m{ ([^/]+) \.plp$ }x;

	# leading output
	$header{content_type} = "text/html; charset=$meta->{charset}";
	print <<"EOT";
<!DOCTYPE html>
<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}">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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};

	# dev indicator
	printf '<p style="%s">beta</p>', join('; ',
		'position: fixed',
		'right: 1em',
		'opacity: .5',
		'border: 1ex solid red',
		'border-width: 1ex 0',
		'z-index: 1',
		'background: inherit',
	) if $ENV{HTTP_HOST} =~ /\bdev\./;

	# 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="source" title="Written in Perl">plp</a>
	version <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> •
	<a href="http://www.fsf.org/licensing/licenses/agpl-3.0.html" rel="license copyright"
	 title="Licensed under the GNU Affero General Public License, version 3">AGPLv3</a>
</p>

</html>
EOT
	};
}