Replace indexed mentions with NIP-27

Changelog-Fixed: Replace indexed mentions with NIP-27
Closes: #1213

damus/Models/Mentions.swift

@@ -10,7 +10,7 @@ import Foundation
 enum MentionType {
     case pubkey
     case event
-    
+
     var ref: String {
         switch self {
         case .pubkey:
@@ -495,14 +495,17 @@ func make_post_tags(post_blocks: [PostBlock], tags: [[String]], silent_mentions:
                 continue
             }
             
-            if let ind = find_tag_ref(type: ref.key, id: ref.ref_id, tags: tags) {
-                let mention = Mention(index: ind, type: mention_type, ref: ref)
+            if find_tag_ref(type: ref.key, id: ref.ref_id, tags: tags) != nil {
+                // Mention index is nil because indexed mentions from NIP-08 is deprecated.
+                // It has been replaced with NIP-27 text note references with nostr: prefixed URIs.
+                let mention = Mention(index: nil, type: mention_type, ref: ref)
                 let block = Block.mention(mention)
                 blocks.append(block)
             } else {
-                let ind = new_tags.count
                 new_tags.append(refid_to_tag(ref))
-                let mention = Mention(index: ind, type: mention_type, ref: ref)
+                // Mention index is nil because indexed mentions from NIP-08 is deprecated.
+                // It has been replaced with NIP-27 text note references with nostr: prefixed URIs.
+                let mention = Mention(index: nil, type: mention_type, ref: ref)
                 let block = Block.mention(mention)
                 blocks.append(block)
             }

damus/Models/Post.swift

@@ -21,7 +21,6 @@ struct NostrPost {
     }
 }
 
-// TODO: parse nostr:{e,p}:pubkey uris as well
 func parse_post_mention_type(_ p: Parser) -> MentionType? {
     if parse_char(p, "@") {
         return .pubkey

damus/Nostr/NostrLink.swift

@@ -60,24 +60,13 @@ func parse_nostr_ref_uri(_ p: Parser) -> ReferencedId? {
     if !parse_str(p, "nostr:") {
         return nil
     }
-    
-    guard let typ = parse_nostr_ref_uri_type(p) else {
+
+    guard let ref = parse_post_bech32_mention(p) else {
         p.pos = start
         return nil
     }
-    
-    if !parse_char(p, ":") {
-        p.pos = start
-        return nil
-    }
-    
-    guard let pk = parse_hexstr(p, len: 64) else {
-        p.pos = start
-        return nil
-    }
-    
-    // TODO: parse relays from nostr uris
-    return ReferencedId(ref_id: pk, relay_id: nil, key: typ)
+
+    return ref
 }
 
 func decode_universal_link(_ s: String) -> NostrLink? {

damus/Views/PostView.swift

@@ -83,7 +83,9 @@ struct PostView: View {
             }
         }
 
-        var content = self.post.string.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
+        var content = self.post.string
+            .trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
+            .replacingOccurrences(of: "\u{200B}", with: "") // these characters are added when adding mentions.
 
         let imagesString = uploadedMedias.map { $0.uploadedURL.absoluteString }.joined(separator: " ")
         

damus/Views/Posting/UserSearch.swift

@@ -63,7 +63,7 @@ struct UserSearch: View {
 
         let tagAttributedString = NSMutableAttributedString(string: tagString,
                                    attributes: [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 18.0),
-                                                NSAttributedString.Key.link: "@\(pk)"])
+                                                NSAttributedString.Key.link: "nostr:\(pk)"])
         tagAttributedString.removeAttribute(.link, range: NSRange(location: tagAttributedString.length - 2, length: 2))
         tagAttributedString.addAttributes([NSAttributedString.Key.foregroundColor: UIColor.label], range: NSRange(location: tagAttributedString.length - 2, length: 2))