From 02c3492b3d574812b5391979e04c399e350a26ed Mon Sep 17 00:00:00 2001
From: 安竹洋平 <61961825+yasutakeyohei@users.noreply.github.com>
Date: Thu, 25 Jan 2024 00:15:16 +0900
Subject: initial commit

---
 src/rehype/admonition-title-to-heading.js | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 src/rehype/admonition-title-to-heading.js

(limited to 'src/rehype/admonition-title-to-heading.js')

diff --git a/src/rehype/admonition-title-to-heading.js b/src/rehype/admonition-title-to-heading.js
new file mode 100644
index 00000000..d84b27b2
--- /dev/null
+++ b/src/rehype/admonition-title-to-heading.js
@@ -0,0 +1,31 @@
+import {visit} from 'unist-util-visit';
+
+const plugin = (options) => {
+  const transformer = async (ast) => {
+    let hId = null;
+    let hContent = null;
+    visit(ast, 'element', (node, index, parent) => {
+        if (/^h[2-6]$/.test(node.tagName) && node.properties && node.properties.id) {
+            // h2～h6のタグを見つけたら
+            hId = node.properties.id;
+            hContent = node.children && node.children[0] ? node.children[0].value : '';
+            // h3～h6タグの隣にあるdivタグを探す
+            const nextNode = parent.children[index + 1];
+            if (nextNode && nextNode.tagName === 'admonition') {
+              // 該当のdiv要素を見つけたらHタグの内容とline-5の#以降の文字列が一致した場合
+                const contentAfterHash = nextNode.properties.title ? nextNode.properties.title.replace(/^#+/, '').trim() : '';
+
+                if (contentAfterHash === hContent.trim()) {
+                    // Hタグのidを取得しそれをdivのidに設定
+                    nextNode.properties.id = hId;
+                    // Hタグを削除
+                    parent.children.splice(index, 1);
+                }
+            }
+          }
+        });
+  };
+  return transformer;
+};
+
+export default plugin;
\ No newline at end of file
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