Add support for extended syntax markdown

Fixes #15

README.md

@@ -200,6 +200,10 @@ Alternatively, you can execute commands from the MediaWiki root directory:
 
 ## Release notes
 
+### Version 1.2.0 - 2021-12-02
+
+* Added support for [extended syntax markdown](https://www.markdownguide.org/extended-syntax/)
+
 ### Version 1.1.0 - 2021-11-01
 
 * Added normalization for github.com URLs to the `#embed` parser function

extension.json

@@ -1,6 +1,6 @@
 {
 	"name": "External Content",
-	"version": "1.1.0",
+	"version": "1.2.0",
 	"license-name": "GPL-2.0-or-later",
 
 	"author": [

src/Domain/ContentRenderer/MarkdownRenderer.php

@@ -5,6 +5,7 @@
 namespace ProfessionalWiki\ExternalContent\Domain\ContentRenderer;
 
 use Michelf\Markdown;
+use Michelf\MarkdownExtra;
 use ProfessionalWiki\ExternalContent\Domain\ContentRenderer;
 
 class MarkdownRenderer implements ContentRenderer {
@@ -16,7 +17,7 @@ public function render( string $content, string $contentUrl ): string {
 	}
 
 	private function newMarkdownParser( string $contentUrl ): Markdown {
-		$parser = new Markdown();
+		$parser = new MarkdownExtra();
 		$urlExpander = new UrlExpander();
 
 		$parser->url_filter_func = fn( string $url ) => $urlExpander->expand( $url, $contentUrl );

tests/Integration/Domain/MarkdownRendererTest.php

@@ -20,9 +20,9 @@ public function testRendersSimpleMarkdown(): void {
 	}
 
 	public function testPurifiesContent(): void {
-		$this->assertSame(
+		$this->assertRendersAs(
 			'<p>I am </p><br />',
-			( new MarkdownRenderer() )->render( 'I am <script>evil</script><div><br></div>', '' )
+			'I am <script>evil</script><div><br></div>'
 		);
 	}
 
@@ -50,4 +50,22 @@ public function linkProvider(): iterable {
 		];
 	}
 
+	public function testRendersFencedCodeBlock(): void {
+		$this->assertRendersAs(
+			'<pre><code>Some codeMore code</code></pre>',
+			"~~~\nSome code\nMore code\n~~~"
+		);
+	}
+
+	private function assertRendersAs( string $expectedHtml, string $markdown ): void {
+		$this->assertSame(
+			$expectedHtml,
+			preg_replace(
+				'/\n+/', // Replace newlines since they get inserted pretty randomly between HTML tags
+				'',
+				( new MarkdownRenderer() )->render( $markdown, '' )
+			)
+		);
+	}
+
 }