From 3e3811c4be44833c984233ad46615f105f5767ac Mon Sep 17 00:00:00 2001
From: "David T. Sadler" <davidtsadler@googlemail.com>
Date: Sat, 22 May 2021 13:29:49 +0100
Subject: Generate sitemap

---
 scripts/build_www_site.php |  2 +-
 scripts/functions.php      | 50 +++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 50 insertions(+), 2 deletions(-)

(limited to 'scripts')

diff --git a/scripts/build_www_site.php b/scripts/build_www_site.php
index e610298..f6a5806 100644
--- a/scripts/build_www_site.php
+++ b/scripts/build_www_site.php
@@ -42,5 +42,5 @@ if (!is_readable($htmlTemplateDiretory)) {
 
 $pages = getPages($geminiSrc, $output);
 
-buildWWWSite($pages, $hostname, $htmlTemplateDiretory);
+buildWWWSite($pages, $hostname, $htmlTemplateDiretory, $output);
 
diff --git a/scripts/functions.php b/scripts/functions.php
index 9b72803..3e8e7a4 100644
--- a/scripts/functions.php
+++ b/scripts/functions.php
@@ -102,7 +102,7 @@ function parseContent(string $content): array
     ];
 }
 
-function buildWWWSite(array $pages, string $hostname, string $htmlTemplateDiretory): void
+function buildWWWSite(array $pages, string $hostname, string $htmlTemplateDiretory, string $output): void
 {
     foreach ($pages as $page) {
         $destDirectory = dirname($page['output']);
@@ -123,6 +123,8 @@ function buildWWWSite(array $pages, string $hostname, string $htmlTemplateDireto
     }
 
     generateAtomFeeds($pages, $hostname);
+
+    generateSiteMap($pages, $hostname, $output);
 }
 
 function buildHtmlFile(string $title, string $contents, string $template): string
@@ -313,3 +315,49 @@ function buildAtomEntry(string $title, string $href, string $author, string $dat
 EOF_STR;
 }
 
+function generateSiteMap(array $pages, string $hostname, $output): void
+{
+    $posts = array_filter($pages, fn ($post) => $post['isPost']);
+
+    /**
+     * Sort by latest to previous date.
+     */
+    usort($posts, fn ($a, $b) => $b['date'] <=> $a['date']);
+
+    file_put_contents(
+        $output.DIRECTORY_SEPARATOR.'sitemap.xml',
+        buildSiteMap(
+            implode('', array_map(fn ($post) => postToSiteMapUrl($post, $hostname), $posts))
+        )
+    );
+
+}
+
+function postToSiteMapUrl(array $post, string $hostname): string
+{
+    return buildSiteMapUrl(
+        "https://$hostname{$post['url']}",
+        "{$post['date']}T12:00:00Z"
+    );
+}
+
+function buildSiteMap(string $urls): string
+{
+    return <<<EOF_STR
+<?xml version="1.0" encoding="utf-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
+    $urls
+</urlset>
+EOF_STR;
+}
+
+function buildSiteMapUrl(string $loc, string $lastmod): string
+{
+    return <<<EOF_STR
+<url>
+    <loc>$loc</loc>
+    <lastmod>$lastmod</lastmod>
+    <changefreq>never</changefreq>
+</url>
+EOF_STR;
+}
-- 
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