From 11e1179976529272cb3acb53962097b35d347b4a Mon Sep 17 00:00:00 2001
From: Mathieu Ducrot <mathieu.ducrot@smartbooster.io>
Date: Wed, 12 Jun 2024 09:06:03 +0200
Subject: [PATCH] Add MarkdownUtils to help formatting markdown content before
 being render as html

---
 CHANGELOG.md                      |  4 ++
 src/Utils/MarkdownUtils.php       | 38 +++++++++++++
 tests/Utils/MarkdownUtilsTest.php | 93 +++++++++++++++++++++++++++++++
 3 files changed, 135 insertions(+)
 create mode 100644 src/Utils/MarkdownUtils.php
 create mode 100644 tests/Utils/MarkdownUtilsTest.php

diff --git a/CHANGELOG.md b/CHANGELOG.md
index bdd02cd..ab3e355 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 CHANGELOG for 1.x
 ===================
+## v1.6.0 - (2024-06-12)
+### Added
+- `MarkdownUtils` to help formatting markdown content before being render as html
+
 ## v1.5.0 - (2024-06-10)
 ### Added
 - `ProcessTrait::restartedAt` Used to know when we wanted to retry this process (creating a new dedicated process based on this one)
diff --git a/src/Utils/MarkdownUtils.php b/src/Utils/MarkdownUtils.php
new file mode 100644
index 0000000..16c6659
--- /dev/null
+++ b/src/Utils/MarkdownUtils.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Smart\CoreBundle\Utils;
+
+use function Symfony\Component\String\u;
+
+/**
+ * @author Mathieu Ducrot <mathieu.ducrot@smartbooster.io>
+ */
+class MarkdownUtils
+{
+    /**
+     * @param string $md '# Heading #{"id": "heading"}'
+     * @param string $baseUrl 'http://url.test'
+     * @return string '# <a href="http://url.test#heading" id="heading">Heading</a>'
+     */
+    public static function addAnchorToHeadings(string $md, string $baseUrl): string
+    {
+        foreach (u($md)->match('/# .* #{.*}/', PREG_PATTERN_ORDER)[0] as $heading) {
+            $lastHashIndex = u($heading)->indexOfLast('#');
+            $text = u($heading)->slice(1, $lastHashIndex - 1)->toString();
+            $data = json_decode(u($heading)->slice($lastHashIndex + 1)->toString(), true);
+            $id = $data['id'] ?? null;
+            if ($id === null) {
+                continue;
+            }
+            $anchoredHeading = sprintf(
+                '# <a href="%s" id="%s">%s</a>',
+                $baseUrl . '#' . $id,
+                $id,
+                trim($text),
+            );
+            $md = u($md)->replace($heading, $anchoredHeading)->toString();
+        }
+
+        return $md;
+    }
+}
diff --git a/tests/Utils/MarkdownUtilsTest.php b/tests/Utils/MarkdownUtilsTest.php
new file mode 100644
index 0000000..387f6d3
--- /dev/null
+++ b/tests/Utils/MarkdownUtilsTest.php
@@ -0,0 +1,93 @@
+<?php
+
+namespace Smart\CoreBundle\Tests\Utils;
+
+use Smart\CoreBundle\Utils\MarkdownUtils;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * vendor/bin/simple-phpunit tests/Utils/MarkdownUtilsTest.php
+ */
+class MarkdownUtilsTest extends TestCase
+{
+    /**
+     * @dataProvider addAnchorToHeadingsProvider
+     */
+    public function testAddAnchorToHeadings(string $expected, string $md, string $baseUrl): void
+    {
+        $this->assertEquals($expected, MarkdownUtils::addAnchorToHeadings($md, $baseUrl));
+    }
+
+    public function addAnchorToHeadingsProvider(): array
+    {
+        $baseUrl = 'http://url.test';
+
+        return [
+            'without heading' => [
+                'Texte',
+                'Texte',
+                $baseUrl,
+            ],
+            'heading without anchor' => [
+                '# Heading',
+                '# Heading',
+                $baseUrl,
+            ],
+            'heading with anchor' => [
+                '# <a href="http://url.test#heading" id="heading">Heading</a>',
+                '# Heading #{"id": "heading"}',
+                $baseUrl,
+            ],
+            'heading with anchor + text before and after which need to be untouched after formatting' => [
+                <<<EOD
+Texte avant
+# <a href="http://url.test#heading" id="heading">Heading</a>
+Texte Après
+EOD,
+                <<<EOD
+Texte avant
+# Heading #{"id": "heading"}
+Texte Après
+EOD,
+                $baseUrl,
+            ],
+            'anchored heading with a level superior to h1' => [
+                <<<EOD
+Texte avant
+### <a href="http://url.test#heading" id="heading">Heading</a>
+Texte Après
+EOD,
+                <<<EOD
+Texte avant
+### Heading #{"id": "heading"}
+Texte Après
+EOD,
+                $baseUrl,
+            ],
+            'multiple headings with same level' => [
+                <<<EOD
+## <a href="http://url.test#heading-a" id="heading-a">Heading A</a>
+## <a href="http://url.test#heading-b" id="heading-b">Heading B</a>
+EOD,
+                <<<EOD
+## Heading A #{"id": "heading-a"}
+## Heading B #{"id": "heading-b"}
+EOD,
+                $baseUrl,
+            ],
+            'multiple headings with different level' => [
+                <<<EOD
+# <a href="http://url.test#heading-1" id="heading-1">Heading 1</a>
+## <a href="http://url.test#heading-2" id="heading-2">Heading 2</a>
+### <a href="http://url.test#heading-3" id="heading-3">Heading 3</a>
+EOD,
+                <<<EOD
+# Heading 1 #{"id": "heading-1"}
+## Heading 2 #{"id": "heading-2"}
+### Heading 3 #{"id": "heading-3"}
+EOD,
+                $baseUrl,
+            ],
+        ];
+    }
+}