Fix broken markdown renderer

This switches away from the old markdown renderer to the new one at
https://github.com/damus-io/swift-markdown-ui

Changelog-Fixed: Fix broken markdown renderer

damus.xcodeproj/project.pbxproj

@@ -96,7 +96,6 @@
 		4C363AA228296A7E006E126D /* SearchView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C363AA128296A7E006E126D /* SearchView.swift */; };
 		4C363AA428296DEE006E126D /* SearchModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C363AA328296DEE006E126D /* SearchModel.swift */; };
 		4C363AA828297703006E126D /* InsertSort.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C363AA728297703006E126D /* InsertSort.swift */; };
-		4C3A1D332960DB0500558C0F /* Markdown.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C3A1D322960DB0500558C0F /* Markdown.swift */; };
 		4C3A1D3729637E0500558C0F /* PreviewCache.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C3A1D3629637E0500558C0F /* PreviewCache.swift */; };
 		4C3AC79B28306D7B00E1F516 /* Contacts.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C3AC79A28306D7B00E1F516 /* Contacts.swift */; };
 		4C3AC79D2833036D00E1F516 /* FollowingView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C3AC79C2833036D00E1F516 /* FollowingView.swift */; };
@@ -540,7 +539,6 @@
 		4C363AA128296A7E006E126D /* SearchView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SearchView.swift; sourceTree = "<group>"; };
 		4C363AA328296DEE006E126D /* SearchModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SearchModel.swift; sourceTree = "<group>"; };
 		4C363AA728297703006E126D /* InsertSort.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InsertSort.swift; sourceTree = "<group>"; };
-		4C3A1D322960DB0500558C0F /* Markdown.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Markdown.swift; sourceTree = "<group>"; };
 		4C3A1D3629637E0500558C0F /* PreviewCache.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PreviewCache.swift; sourceTree = "<group>"; };
 		4C3AC79A28306D7B00E1F516 /* Contacts.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Contacts.swift; sourceTree = "<group>"; };
 		4C3AC79C2833036D00E1F516 /* FollowingView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FollowingView.swift; sourceTree = "<group>"; };
@@ -1245,7 +1243,6 @@
 				4CE879492995B58700F758CC /* Relays */,
 				4CF0ABEA29844B2F00D66079 /* AnyCodable */,
 				4CC7AAE6297EFA7B00430951 /* Zap.swift */,
-				4C3A1D322960DB0500558C0F /* Markdown.swift */,
 				F7908E96298B1FDF00AB113A /* NIPURLBuilder.swift */,
 				4CEE2AF4280B29E600AB5EEF /* TimeAgo.swift */,
 				4CE4F8CC281352B30009DFBB /* Notifications.swift */,
@@ -2092,7 +2089,6 @@
 				5C513FBA297F72980072348F /* CustomPicker.swift in Sources */,
 				4CACA9D5280C31E100D9BBE8 /* ReplyView.swift in Sources */,
 				F7908E92298B0F0700AB113A /* RelayDetailView.swift in Sources */,
-				4C3A1D332960DB0500558C0F /* Markdown.swift in Sources */,
 				4C9147002A2A891E00DDEA40 /* error.c in Sources */,
 				4CE879552996BAB900F758CC /* RelayPaidDetail.swift in Sources */,
 				501F8C5529FF5EF6001AFC1D /* PersistedProfile.swift in Sources */,

damus/Models/HomeModel.swift

@@ -1243,7 +1243,7 @@ func render_notification_content_preview(cache: EventCache, ev: NostrEvent, prof
     }
     
     switch artifacts {
-    case .parts:
+    case .longform:
         // we should never hit this until we have more note types built out of parts
         // since we handle this case above in known_kind == .longform
         return String(ev.content.prefix(prefix_len))

damus/Util/Markdown.swift

@@ -1,88 +0,0 @@
-//
-//  Markdown.swift
-//  damus
-//
-//  Created by Lionello Lunesu on 2022-12-28.
-//
-
-import Foundation
-import SwiftUI
-
-func count_leading_hashes(_ str: String) -> Int {
-    var count = 0
-    for c in str {
-        if c == "#" {
-            count += 1
-        } else {
-            break
-        }
-    }
-    
-    return count
-}
-
-func get_heading_title_size(count: Int) -> SwiftUI.Font {
-    if count >= 3 {
-        return Font.title3
-    } else if count >= 2 {
-        return Font.title2
-    } else if count >= 1 {
-        return Font.title
-    }
-    
-    return Font.body
-}
-
-public struct Markdown {
-    private var detector = try? NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
-    
-    /// Ensure the specified URL has a scheme by prepending "https://" if it's absent.
-    static func withScheme(_ url: any StringProtocol) -> any StringProtocol {
-        return url.contains("://") ? url : "https://" + url
-    }
-
-    /// Parse a string with markdown into an `AttributedString`, if possible, or else return it as regular text.
-    public static func parse(content: String) -> AttributedString {
-        let md_opts: AttributedString.MarkdownParsingOptions =
-            .init(interpretedSyntax: .inlineOnlyPreservingWhitespace)
-        
-        guard content.utf8.count > 0 else {
-            return AttributedString(stringLiteral: "")
-        }
-        
-        let leading_hashes = count_leading_hashes(content)
-        if leading_hashes > 0 {
-            if var str = try? AttributedString(markdown: content) {
-                str.font = get_heading_title_size(count: leading_hashes)
-                return str
-            }
-        }
-
-        // TODO: escape unintentional markdown
-        let escaped = content.replacingOccurrences(of: "\\_", with: "\\\\\\_")
-        if let txt = try? AttributedString(markdown: escaped, options: md_opts) {
-            return txt
-        } else {
-            return AttributedString(stringLiteral: content)
-        }
-    }
-
-    /// Process the input text and add markdown for any embedded URLs.
-    public func process(_ input: String) -> AttributedString {
-        guard let detector else {
-            return AttributedString(stringLiteral: input)
-        }
-        let matches = detector.matches(in: input, options: [], range: NSRange(location: 0, length: input.utf16.count))
-        var output = input
-        // Start with the last match, because replacing the first would invalidate all subsequent indices
-        for match in matches.reversed() {
-            guard let range = Range(match.range, in: input)
-                , let url = match.url else { continue }
-            let text = input[range]
-            // Use the absoluteString from the matched URL, except when it defaults to http (since we default to https)
-            let uri = url.scheme == "http" ? Markdown.withScheme(text) : url.absoluteString
-            output.replaceSubrange(range, with: "[\(text)](\(uri))")
-        }
-        return Markdown.parse(content: output)
-    }
-}

damus/Views/EULAView.swift

@@ -7,6 +7,8 @@
 
 import SwiftUI
 
+import MarkdownUI
+
 let eula = """
 **End User License Agreement**
 
@@ -63,7 +65,7 @@ struct EULAView: View {
     var body: some View {
         ZStack {
             ScrollView {
-                Text(Markdown.parse(content: eula))
+                Markdown(eula)
                     .padding()
             }
             .padding(EdgeInsets(top: 20, leading: 10, bottom: 50, trailing: 10))

damus/Views/Events/Longform/LongformPreview.swift

@@ -58,9 +58,9 @@ struct LongformPreviewBody: View {
                 .foregroundColor(.gray)
 
             if case .loaded(let arts) = artifacts.state,
-               case .parts(let parts) = arts
+               case .longform(let longform) = arts
             {
-                Words(parts.words).font(.footnote)
+                Words(longform.words).font(.footnote)
             }
         }
     }

damus/Views/FollowingView.swift

@@ -11,8 +11,6 @@ struct FollowUserView: View {
     let target: FollowTarget
     let damus_state: DamusState
 
-    static let markdown = Markdown()
-
     var body: some View {
         HStack {
             UserViewRow(damus_state: damus_state, pubkey: target.pubkey)

damus/Views/NoteContentView.swift

@@ -8,6 +8,7 @@
 import SwiftUI
 import LinkPresentation
 import NaturalLanguage
+import MarkdownUI
 
 struct Blur: UIViewRepresentable {
     var style: UIBlurEffect.Style = .systemUltraThinMaterial
@@ -212,8 +213,9 @@ struct NoteContentView: View {
     var ArtifactContent: some View {
         Group {
             switch self.note_artifacts {
-            case .parts(let parts):
+            case .longform(let md):
-                artifactPartsView(parts.parts)
+                Markdown(md.markdown)
+                    .padding(.horizontal)
             case .separated(let separated):
                 MainContent(artifacts: separated)
             }
@@ -285,22 +287,27 @@ func mention_str(_ m: Mention, profiles: Profiles) -> CompatibleText {
     }
 }
 
+struct LongformContent {
+    let markdown: MarkdownContent
+    let words: Int
+
+    init(_ markdown: String) {
+        let blocks = [BlockNode].init(markdown: markdown)
+        self.markdown = MarkdownContent(blocks: blocks)
+        self.words = count_markdown_words(blocks: blocks)
+    }
+}
+
 enum NoteArtifacts {
     case separated(NoteArtifactsSeparated)
-    case parts(NoteArtifactsParts)
+    case longform(LongformContent)
-    
+
     var images: [URL] {
         switch self {
         case .separated(let arts):
             return arts.images
-        case .parts(let parts):
+        case .longform:
-            return parts.parts.reduce(into: [URL]()) { acc, part in
+            return []
-                guard case .media(let m) = part,
-                      case .image(let url) = m
-                else { return }
-                
-                acc.append(url)
-            }
         }
     }
 }
@@ -390,7 +397,7 @@ func render_note_content(ev: NostrEvent, profiles: Profiles, privkey: String?) -
     let blocks = ev.blocks(privkey)
     
     if ev.known_kind == .longform {
-        return .parts(render_blocks_parted(blocks: blocks, profiles: profiles))
+        return .longform(LongformContent(ev.content))
     }
     
     return .separated(render_blocks(blocks: blocks, profiles: profiles))
@@ -409,68 +416,6 @@ fileprivate func artifact_part_last_text_ind(parts: [ArtifactPart]) -> (Int, Tex
     return (ind, txt)
 }
 
-func render_blocks_parted(blocks bs: Blocks, profiles: Profiles) -> NoteArtifactsParts {
-    let blocks = bs.blocks
-    
-    let new_parts = NoteArtifactsParts(parts: [], words: bs.words)
-    
-    return blocks.reduce(into: new_parts) { parts, block in
-        
-        switch block {
-        case .mention(let m):
-            guard let (last_ind, txt) = artifact_part_last_text_ind(parts: parts.parts) else {
-                parts.parts.append(.text(mention_str(m, profiles: profiles).text))
-                return
-            }
-            parts.parts[last_ind] = .text(txt + mention_str(m, profiles: profiles).text)
-            
-        case .text(let str):
-            guard let (last_ind, txt) = artifact_part_last_text_ind(parts: parts.parts) else {
-                // TODO: (jb55) md is longform specific
-                let md = Markdown.parse(content: str)
-                parts.parts.append(.text(Text(md)))
-                return
-            }
-            
-            parts.parts[last_ind] = .text(txt + Text(str))
-            
-        case .relay(let relay):
-            guard let (last_ind, txt) = artifact_part_last_text_ind(parts: parts.parts) else {
-                parts.parts.append(.text(Text(relay)))
-                return
-            }
-            
-            parts.parts[last_ind] = .text(txt + Text(relay))
-            
-        case .hashtag(let htag):
-            guard let (last_ind, txt) = artifact_part_last_text_ind(parts: parts.parts) else {
-                parts.parts.append(.text(hashtag_str(htag).text))
-                return
-            }
-            
-            parts.parts[last_ind] = .text(txt + hashtag_str(htag).text)
-            
-        case .invoice(let invoice):
-            parts.parts.append(.invoice(invoice))
-            return
-            
-        case .url(let url):
-            let url_type = classify_url(url)
-            switch url_type {
-            case .media(let media_url):
-                parts.parts.append(.media(media_url))
-            case .link(let url):
-                guard let (last_ind, txt) = artifact_part_last_text_ind(parts: parts.parts) else {
-                    parts.parts.append(.text(url_str(url).text))
-                    return
-                }
-                
-                parts.parts[last_ind] = .text(txt + url_str(url).text)
-            }
-        }
-    }
-}
-
 func reduce_text_block(blocks: [Block], ind: Int, txt: String, one_note_ref: Bool) -> CompatibleText {
     var trimmed = txt
     

damus/Views/Profile/ProfileView.swift

@@ -103,8 +103,6 @@ struct ProfileView: View {
     let damus_state: DamusState
     let pfp_size: CGFloat = 90.0
     let bannerHeight: CGFloat = 150.0
-    
-    static let markdown = Markdown()
 
     @State var is_zoomed: Bool = false
     @State var show_share_sheet: Bool = false