X-Git-Url: http://git.shiar.nl/sheet.git/blobdiff_plain/8e926bf429bf6add331c40a6620da69d37b7c585..HEAD:/perl.plp

diff --git a/perl.plp b/perl.plp
index 7742f80..596e4d8 100644
--- a/perl.plp
+++ b/perl.plp
@@ -2,7 +2,7 @@
 
 Html({
 	title => 'perl version cheat sheet',
-	version => 'v1.0',
+	version => '1.6',
 	keywords => [qw'
 		perl version feature features comparison
 		sheet cheat overview summary
@@ -11,16 +11,132 @@ Html({
 	data => ['perl.inc.pl'],
 });
 
+use experimental 'signatures';
 :>
-<h1>Perl cheat sheets</h1>
+<h1>Perl release summary</h1>
 
+<p>The most significant features introduced for recent versions of the Perl
+scripting language.
 <:
-my $info = do 'perl.inc.pl' or die $@ // $!;
-for my $ver (reverse sort keys %{$info}) {
-	print '<div class="section">'."\n";
-	printf '<h2>%vd</h2><dl>'."\n", $ver;
-	printf '<dt>%s<dd>%s', Entity(@{$_}), '<br/>' for @{ $info->{$ver} };
-	print "</dl>\n";
-	print "</div>\n\n";
+my $info = Data('perl');
+
+use feature 'signatures';
+sub vname ($v) {
+	return sprintf 'v%d%03d', unpack 'C*', $v;
+}
+sub linkversion ($v) {
+	return showlink(sprintf('%vd', $v), '#'.vname($v));
 }
 
+eval {
+	use List::Util 'first';
+	use Time::Piece;
+	use Time::Seconds;
+
+	my $now = Time::Piece->new;
+	if (my $ts = $get{at}) {
+		$now = $now->strptime($ts, '%Y-%m-%d');
+		say "Compatibility details emulated for <em>$ts</em>.";
+	}
+	my $ts = $now->strftime('%F');
+	my @versions = sort grep { $info->{$_}{release} le $ts } keys %{$info};
+
+	# perlpolicy: «We "officially" support the two most recent stable release
+	# series. [...] we will attempt to fix critical issues»
+	$info->{ $versions[-2] }{versum} //= "active core support";
+	$info->{ $versions[-1] }{versum} //= "latest stable release";
+
+	# perlpolicy: «we will attempt to fix critical issues in the two most
+	# recent stable 5.x release series»
+	my $coreeol = ($now - ONE_YEAR * 3)->strftime('%F');
+	my $vcore = first { $info->{$_}{release} ge $coreeol } @versions;
+	print "<p>Core security support is provided for 3 years";
+	print ", so typical users should run at least ", linkversion($_)
+		for $vcore // ();
+	say '.';
+	$info->{$vcore}{versum} //= "official security patches";
+
+	# «We encourage vendors to ship the most recent supported release of Perl
+	# at the time of their code freeze»
+	# assume debian ships after 1 year, and expires after 5 years LTS
+	my $vendoreol = ($now - ONE_YEAR * 6)->strftime('%F');
+	my $vdebian = first {
+		$info->{$_}{release} ge $vendoreol && $info->{$_}{distro}{debian}
+	} @versions;
+	say sprintf "Stable distributions such as Debian %s maintain %s+.",
+		$info->{$_}{distro}{debian}, linkversion($_) for $vdebian // ();
+	$info->{$vdebian}{versum} //= "still maintained by common vendors";
+
+	# extended support given at random
+	my $nowcmp = $now->strftime('%F');
+	my $vdino = first { $info->{$_}{support} ge $nowcmp } @versions;
+	say "Enterprise platforms retain versions up to $_."
+		for map { linkversion($_) } $vdino // ();
+	return 1;
+} or Alert('Missing version recommendations', $@);
+say '</p>';
+
+for my $vernum (reverse sort keys %{$info}) {
+	my $verrow = $info->{$vernum};
+	defined $verrow->{unstable} and next unless exists $get{v};
+
+	say sprintf '<div class="section" id="%s">', vname($vernum);
+	my $title = $verrow->{release} // '?';
+	$title .= ": $_" for $verrow->{versum} // ();
+	say sprintf '<h2>%vd <small>%s</small></h2>', $vernum, $title;
+	say '<dl>';
+	for (@{ $verrow->{new} }) {
+		my ($topic, $desc, $attr) = @{$_};
+		$desc .= featattrs($attr);
+		my $ref = defined $attr->{name} && sprintf ' id="%s"', $attr->{name};
+		say sprintf '<dt%s>%s<dd>%s', $ref, $topic, $desc || '<br/>';
+	}
+	if (my $mods = $verrow->{modules}) {
+		for (@{$mods}) {
+			my ($name, $desc, $attr) = @{$_};
+			my $ref = lc $name =~ s/::/_/gr;
+			$desc .= featattrs($attr);
+			printf '<dt id="%s"><code>use %s</code>', $ref, $name;
+			say '<dd>', $desc;
+		}
+	}
+	say sprintf '<dt>Unicode</dt><dd>v%s', $_ for $verrow->{unicode} || ();
+	say '</dl>';
+	say "</div>\n";
+}
+
+sub featattrs ($attr) {
+	$attr or return '';
+	ref $attr or $attr = {eg => $attr};
+	my $title;
+	if (defined $attr->{experimental}) {
+		$title = 'experimental';
+	}
+	if (defined $attr->{dropped}) {
+		return '' unless exists $get{v};
+		$title = sprintf 'removed in %vd', $_ for $attr->{dropped} || ();
+	}
+	elsif ($attr->{stable}) {
+		$title .= sprintf ' until %vd', $attr->{stable};
+	}
+	if ($attr->{experimental}) {
+		$title = sprintf '<span title="experimental::%s">%s</span>',
+			$attr->{experimental}, $title;
+		$attr->{name} //= $attr->{experimental};
+	}
+	if ($attr->{feature}) {
+		my $prefix = sprintf '<span title="%s">feature</span>',
+			$attr->{feature};
+		$title = join ', ', $prefix, $title // ();
+		$attr->{name} //= $attr->{feature};
+	}
+	$title = $title ? sprintf ' <em class="ex">(%s)</em>', $title : '';
+
+	if (my $eg = $attr->{eg}) {
+		my $pre = Entity($eg);
+		$pre =~ s<\N{ZERO WIDTH SPACE}>{</code><wbr/><code>}g;
+		$pre = " <small>{<code>$pre</code>}</small>";
+		$title = $pre . $title;
+	}
+	return $title;
+}