Allow exporting highlights and notes as markdown

apple/OmnivoreKit/Sources/App/Views/Highlights/HighlightsListCard.swift

@@ -7,6 +7,7 @@ struct HighlightsListCard: View {
   @State var annotation = String()
   @State var showAnnotationModal = false
 
+  let viewModel: HighlightsListViewModel
   let highlightParams: HighlightListItemParams
   @Binding var hasHighlightMutations: Bool
   let onSaveAnnotation: (String) -> Void
@@ -15,6 +16,7 @@ struct HighlightsListCard: View {
 
   @State var errorAlertMessage: String?
   @State var showErrorAlertMessage = false
+  @State var showShareView = false
 
   var contextMenuView: some View {
     Group {
@@ -40,6 +42,10 @@ struct HighlightsListCard: View {
         },
         label: { Label(LocalText.labelsGeneric, systemImage: "tag") }
       )
+      Button(
+        action: { showShareView = true },
+        label: { Label("Export", systemImage: "square.and.arrow.up") }
+      )
       Button(
         action: onDeleteHighlight,
         label: { Label("Delete", systemImage: "trash") }
@@ -166,5 +172,8 @@ struct HighlightsListCard: View {
         showErrorAlertMessage: $showErrorAlertMessage
       )
     }
+    .formSheet(isPresented: $showShareView) {
+      ShareSheet(activityItems: [viewModel.highlightAsMarkdown(item: self.highlightParams)])
+    }
   }
 }

apple/OmnivoreKit/Sources/App/Views/Highlights/HighlightsListView.swift

@@ -12,6 +12,7 @@ struct HighlightsListView: View {
   let itemObjectID: NSManagedObjectID
   @Binding var hasHighlightMutations: Bool
   @State var setLabelsHighlight: Highlight?
+  @State var showShareView: Bool = false
 
   var emptyView: some View {
     Text(LocalText.highlightCardNoHighlightsOnPage)
@@ -26,9 +27,14 @@ struct HighlightsListView: View {
     #if os(iOS)
       .navigationBarTitleDisplayMode(.inline)
       .toolbar {
-        ToolbarItem(placement: .navigationBarTrailing) {
+        ToolbarItem(placement: .navigationBarLeading) {
           dismissButton
         }
+        ToolbarItem(placement: .navigationBarTrailing) {
+          actionsMenu
+        }
+      }.formSheet(isPresented: $showShareView) {
+        ShareSheet(activityItems: [viewModel.highlightsAsMarkdown()])
       }
     #else
       .toolbar {
@@ -44,6 +50,7 @@ struct HighlightsListView: View {
       Section {
         ForEach(viewModel.highlightItems) { highlightParams in
           HighlightsListCard(
+            viewModel: self.viewModel,
             highlightParams: highlightParams,
             hasHighlightMutations: $hasHighlightMutations,
             onSaveAnnotation: {
@@ -82,7 +89,22 @@ struct HighlightsListView: View {
   var dismissButton: some View {
     Button(
       action: { presentationMode.wrappedValue.dismiss() },
-      label: { Text(LocalText.doneGeneric).foregroundColor(.appGrayTextContrast) }
+      label: { Text(LocalText.genericClose) }
+    )
+  }
+
+  var actionsMenu: some View {
+    Menu(
+      content: {
+        Button(
+          action: { showShareView = true },
+          label: { Label("Export", systemImage: "square.and.arrow.up") }
+        )
+      },
+      label: {
+        Image(systemName: "ellipsis")
+          .foregroundColor(.appGrayTextContrast)
+      }
     )
   }
 

apple/OmnivoreKit/Sources/App/Views/Highlights/HighlightsListViewModel.swift

@@ -58,6 +58,19 @@ struct HighlightListItemParams: Identifiable {
     }
   }
 
+  func highlightAsMarkdown(item: HighlightListItemParams) -> String {
+    var buffer = "> \(item.quote)"
+    if !item.annotation.isEmpty {
+      buffer += "\n\n\(item.annotation)"
+    }
+    buffer += "\n"
+    return buffer
+  }
+
+  func highlightsAsMarkdown() -> String {
+    highlightItems.map { highlightAsMarkdown(item: $0) }.lazy.joined(separator: "\n\n")
+  }
+
   private func loadHighlights(item: LinkedItem) {
     let unsortedHighlights = item.highlights.asArray(of: Highlight.self)