recognize nostr entities

lib/rehype-sn.js

@@ -8,6 +8,7 @@ const subGroup = '[A-Za-z][\\w_]+'
 
 const mentionRegex = new RegExp('@(' + userGroup + '(?:\\/' + userGroup + ')?)', 'gi')
 const subRegex = new RegExp('~(' + subGroup + '(?:\\/' + subGroup + ')?)', 'gi')
+const nostrIdRegex = /\b((npub1|nevent1|nprofile1|note1|naddr1)[02-9ac-hj-np-z]+)\b/g
 
 export default function rehypeSN (options = {}) {
   const { stylers = [] } = options
@@ -120,12 +121,37 @@ export default function rehypeSN (options = {}) {
             lastIndex = combinedRegex.lastIndex
           }
 
-          if (lastIndex < text.length) {
-            newChildren.push({ type: 'text', value: text.slice(lastIndex) })
+          if (newChildren.length > 0) {
+            if (lastIndex < text.length) {
+              newChildren.push({ type: 'text', value: text.slice(lastIndex) })
+            }
+            parent.children.splice(index, childrenConsumed, ...newChildren)
+            return index + newChildren.length
+          }
+        }
+
+        // Handle Nostr IDs
+        if (node.type === 'text') {
+          const newChildren = []
+          let lastIndex = 0
+          let match
+
+          while ((match = nostrIdRegex.exec(node.value)) !== null) {
+            if (lastIndex < match.index) {
+              newChildren.push({ type: 'text', value: node.value.slice(lastIndex, match.index) })
+            }
+
+            newChildren.push(replaceNostrId(match[0], match[0]))
+
+            lastIndex = nostrIdRegex.lastIndex
+          }
+
+          if (lastIndex < node.value.length) {
+            newChildren.push({ type: 'text', value: node.value.slice(lastIndex) })
           }
 
           if (newChildren.length > 0) {
-            parent.children.splice(index, childrenConsumed, ...newChildren)
+            parent.children.splice(index, 1, ...newChildren)
             return index + newChildren.length
           }
         }
@@ -238,4 +264,13 @@ export default function rehypeSN (options = {}) {
 
     return misleading
   }
+
+  function replaceNostrId (value, id) {
+    return {
+      type: 'element',
+      tagName: 'a',
+      properties: { href: `https://njump.me/${id}` },
+      children: [{ type: 'text', value }]
+    }
+  }
 }