[Blog] Fix relative links in excerpts on landing and index pages

src/Pages/BlogIndexPage.php

@@ -9,6 +9,7 @@
 use DanielWebsite\Blog\BlogPostStore;
 use DanielWebsite\SitemapEntry;
 use League\CommonMark\Extension\CommonMark\Node\Block\Heading;
+use League\CommonMark\Extension\CommonMark\Node\Inline\Link;
 use League\CommonMark\Node\Block\Paragraph;
 use League\CommonMark\Node\Query;
 use League\CommonMark\Parser\MarkdownParser;
@@ -42,6 +43,18 @@ protected function build(): void {
 		foreach ( $posts as $post ) {
 			$parsedResult = $parser->parse( $post->markdown );
 
+			// For any links in the first paragraph of a blog post that are
+			// relative to the blog post, adjust the paths
+			$links = ( new Query() )
+				->where( Query::type( Link::class ) )
+				->findAll( $parsedResult );
+			foreach ( $links as $link ) {
+				$url = $link->getUrl();
+				if ( str_starts_with( $url, './' ) ) {
+					$link->setUrl( './Blog/' . substr( $url, 2 ) );
+				}
+			}
+
 			$firstHeading = ( new Query() )
 				->where( Query::type( Heading::class ) )
 				->findOne( $parsedResult );

src/Pages/LandingPage.php

@@ -9,6 +9,7 @@
 use DanielWebsite\Blog\BlogPostStore;
 use DanielWebsite\SitemapEntry;
 use League\CommonMark\Extension\CommonMark\Node\Block\Heading;
+use League\CommonMark\Extension\CommonMark\Node\Inline\Link;
 use League\CommonMark\Node\Block\Paragraph;
 use League\CommonMark\Node\Query;
 use League\CommonMark\Parser\MarkdownParser;
@@ -126,6 +127,18 @@ protected function build(): void {
 
 		$parsedResult = $parser->parse( $latestPost->markdown );
 
+		// For any links in the first paragraph of a blog post that are
+		// relative to the blog post, adjust the paths
+		$links = ( new Query() )
+			->where( Query::type( Link::class ) )
+			->findAll( $parsedResult );
+		foreach ( $links as $link ) {
+			$url = $link->getUrl();
+			if ( str_starts_with( $url, './' ) ) {
+				$link->setUrl( './Blog/' . substr( $url, 2 ) );
+			}
+		}
+
 		$firstHeading = ( new Query() )
 			->where( Query::type( Heading::class ) )
 			->findOne( $parsedResult );

tests/data/Home.html

@@ -4,7 +4,7 @@
 Computer Science and Political Science and graduating <em>magna cum laude</em> in 2024 with a Bachelor of Science degree. As part of my work in Computer
 Science, I chose to write an honors thesis in my senior year, see <a href="./Thesis">here</a> for details. I continued at Tufts for graduate school, graduating in 2025 with
 a Master of Science in Computer Science degree.</p><p>See the links in the navigation bar above for more information about my
-experience.</p><h2 class="subsection-header">Contact</h2><ul><li><a href="https://www.linkedin.com/in/daniel-scherzer-520539263/" target="_blank" class="external-link">LinkedIn</a></li><li>Email: <code>daniel.e.scherzer@gmail.com</code></li></ul><h2 class="subsection-header">Blog</h2><p>I also have a blog. You can see a full index of my posts <a href="/Blog">here</a>. My latest blog post is: </p><div class="blog-preview"><h3>Friends in PHP</h3><span class="blog-preview-date">Monday, 09 March 2026</span><p>As I mentioned in <a href="./20260302-confoo">my last blog post</a>, while at ConFoo I and a few
+experience.</p><h2 class="subsection-header">Contact</h2><ul><li><a href="https://www.linkedin.com/in/daniel-scherzer-520539263/" target="_blank" class="external-link">LinkedIn</a></li><li>Email: <code>daniel.e.scherzer@gmail.com</code></li></ul><h2 class="subsection-header">Blog</h2><p>I also have a blog. You can see a full index of my posts <a href="/Blog">here</a>. My latest blog post is: </p><div class="blog-preview"><h3>Friends in PHP</h3><span class="blog-preview-date">Monday, 09 March 2026</span><p>As I mentioned in <a href="./Blog/20260302-confoo">my last blog post</a>, while at ConFoo I and a few
 other developers worked on some ideas for adding friendship support to PHP. To
 be clear, these are just ideas at the moment, but I figured they were worth
 sharing. <a href="/Blog/20260309-php-friends">Continue reading...</a></p></div></div><div class="des-footer"><div class="des-footer--content">Content is © 2026 Daniel Scherzer</div></div></body></html>

tests/data/blog-index.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="en"><head><link rel="icon" href="data:,"><meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1"><link rel="stylesheet" type="text/css" href="/resources/default-styles.css"><title>Blog index</title><link rel="stylesheet" type="text/css" href="/resources/blog-styles.css"></head><body><div class="des-navbar"><a href="/Home">Home</a><a href="/files/Resume.pdf">Résumé</a><a href="/OpenSource">Open Source</a><a href="/Work">Work</a><strong class="des-strong-page-link">Blog</strong></div><div class="content-wrapper"><h1>Blog index</h1><div class="blog-preview"><h2>Friends in PHP</h2><span class="blog-preview-date">Monday, 09 March 2026</span><p>As I mentioned in <a href="./20260302-confoo">my last blog post</a>, while at ConFoo I and a few
+<html lang="en"><head><link rel="icon" href="data:,"><meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1"><link rel="stylesheet" type="text/css" href="/resources/default-styles.css"><title>Blog index</title><link rel="stylesheet" type="text/css" href="/resources/blog-styles.css"></head><body><div class="des-navbar"><a href="/Home">Home</a><a href="/files/Resume.pdf">Résumé</a><a href="/OpenSource">Open Source</a><a href="/Work">Work</a><strong class="des-strong-page-link">Blog</strong></div><div class="content-wrapper"><h1>Blog index</h1><div class="blog-preview"><h2>Friends in PHP</h2><span class="blog-preview-date">Monday, 09 March 2026</span><p>As I mentioned in <a href="./Blog/20260302-confoo">my last blog post</a>, while at ConFoo I and a few
 other developers worked on some ideas for adding friendship support to PHP. To
 be clear, these are just ideas at the moment, but I figured they were worth
 sharing. <a href="/Blog/20260309-php-friends">Continue reading...</a></p></div><div class="blog-preview"><h2>ConFoo 2026</h2><span class="blog-preview-date">Monday, 02 March 2026</span><p>Last week, I was in Montreal for the ConFoo conference, where I gave two talks,