From 10356b51f95050d0aec0cd1807d5ba1ec46d475a Mon Sep 17 00:00:00 2001
From: Mischa POSLAWSKY <perl@shiar.org>
Date: Mon, 18 Nov 2019 16:12:26 +0100
Subject: [PATCH] doclist: sublists of multiple dates grouped by year

---
 widget/doclist.php | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/widget/doclist.php b/widget/doclist.php
index a465768..5c11c68 100644
--- a/widget/doclist.php
+++ b/widget/doclist.php
@@ -6,11 +6,12 @@ foreach (glob("$Page$Args/2*") as $url) {
 	$link = preg_replace('/\.html$/', '', $url);
 	$name = pathinfo($link, PATHINFO_BASENAME);
 	@list ($date, $suffix) = explode('.', $name, 2);
-	if (!isset($cal[$date])) {
-		$cal[$date] = [];
+	$group = substr($date, 0, 4);
+	if (!isset($cal[$group][$date])) {
+		$cal[$group][$date] = [];
 	}
 	if (!is_dir($url) and filesize($url)) {
-		$cal[$date][$suffix] = $link;
+		$cal[$group][$date][$suffix] = $link;
 	}
 }
 
@@ -19,8 +20,17 @@ $scale = 8;  # em width per year
 $mindate = strtotime($date) + ($year / $scale * 3);  # first point plus about 3em for centered text
 
 print '<ul class="timeline">'."\n";
-foreach (array_reverse($cal) as $title => $versions) {
+foreach (array_reverse($cal, TRUE) as $group => $rows) {
+	if (count($rows) > 1) {
+		$time = ($mindate - strtotime("$group-12-31T23:59")) / $year * $scale;
+		printf('<li class="range" style="left:%.1fem; width:%sem">', $time, $scale);
+		print "<strong>$group</strong><ul>\n";
+	}
+	else {
 		$time = 0;
+	}
+
+	foreach ($rows as $title => $versions) {
 		$subtime = ($mindate - strtotime($title)) / $year * $scale - $time;
 		printf('<li style="left:%.1fem">', $subtime);
 		if ($url = @$versions['']) {
@@ -40,6 +50,11 @@ foreach (array_reverse($cal) as $title => $versions) {
 			print '</span>';
 		}
 		print "</li>\n";
+	}
+
+	if (count($rows) > 1) {
+		print "</ul></li>\n";
+	}
 }
 print "</ul>\n\n";
 
-- 
2.30.0