Add link highlighting to agreements and message board. Add basic markdown styling and link highlighting to chat messages.

1 files changed, 57 insertions, 0 deletions

diff --git a/Hotline/Shared/AsyncLinkPreview.swift b/Hotline/Shared/AsyncLinkPreview.swift
new file mode 100644
index 0000000..9f0c4c2
--- /dev/null
+++ b/Hotline/Shared/AsyncLinkPreview.swift
@@ -0,0 +1,57 @@
+import SwiftUI
+import LinkPresentation
+
+fileprivate class CustomLinkView: LPLinkView {
+  override var intrinsicContentSize: CGSize { CGSize(width: 0, height: super.intrinsicContentSize.height) }
+}
+
+struct AsyncLinkPreview: View {
+  @State private var metadata: LPLinkMetadata?
+  @State private var isLoading = true
+  let url: URL?
+  
+  func fetchMetadata() async {
+    guard let url else {
+      self.isLoading = false
+      return
+    }
+    do {
+      let provider = LPMetadataProvider()
+      let metadata = try await provider.startFetchingMetadata(for: url)
+      self.metadata = metadata
+      self.isLoading = false
+    } catch {
+      self.isLoading = false
+    }
+  }
+  
+  var body: some View {
+    if isLoading {
+      ProgressView()
+        .controlSize(.small)
+        .task {
+          await self.fetchMetadata()
+        }
+    } else if let metadata = metadata {
+      LinkView(metadata: metadata)
+        .frame(width: 200)
+    } else {
+      Text(LocalizedStringKey(url!.absoluteString.convertLinksToMarkdown()))
+        .multilineTextAlignment(.leading)
+        .tint(Color("Link Color"))
+    }
+  }
+}
+
+struct LinkView: NSViewRepresentable {
+  var metadata: LPLinkMetadata
+  
+  func makeNSView(context: Context) -> LPLinkView {
+    let linkView = CustomLinkView(metadata: metadata)
+    return linkView
+  }
+  
+  func updateNSView(_ nsView: LPLinkView, context: Context) {
+    // Nothing required
+  }
+}