Add image gallery block

CHDataManagement/Views/Pages/Commands/Insert+Gallery.swift

@@ -0,0 +1,68 @@
+import SwiftUI
+import SFSafeSymbols
+
+struct InsertableGallery: View, InsertableCommandView {
+
+    static let title = "Gallery"
+
+    static let sheetTitle = "Insert an image gallery"
+
+    static let icon: SFSymbol = .photoStack
+
+    final class Model: InsertableCommandModel {
+
+        @Published
+        var images: [FileResource] = []
+
+        var isReady: Bool {
+            !images.isEmpty
+        }
+
+        init() {
+
+        }
+
+        var command: String? {
+            guard !images.isEmpty else {
+                return nil
+            }
+            return (
+                ["```\(GalleryBlock.blockId)"] +
+                images.map { $0.id } +
+                ["```"]
+            ).joined(separator: "\n")
+        }
+    }
+
+    @Environment(\.colorScheme)
+    private var colorScheme
+
+    @ObservedObject
+    private var model: Model
+
+    @State
+    private var showImagePicker = false
+
+    init(model: Model) {
+        self.model = model
+    }
+
+    var body: some View {
+        VStack(spacing: 2) {
+            ScrollView(.horizontal) {
+                HStack(alignment: .center, spacing: 8) {
+                    ForEach(model.images) { image in
+                        PostImageView(image: image)
+                    }
+                }
+            }
+            Button("Select images", action: { showImagePicker = true })
+            .padding(.vertical, 2)
+        }
+        .sheet(isPresented: $showImagePicker) {
+            MultiFileSelectionView(
+                selectedFiles: $model.images,
+                allowedType: .image)
+        }
+    }
+}

CHDataManagement/Views/Pages/Commands/InsertableItemsView.swift

@@ -7,6 +7,7 @@ struct InsertableItemsView: View {
             Text("Commands")
                 .font(.headline)
             InsertableView<InsertableImage>()
+            InsertableView<InsertableGallery>()
             InsertableView<InsertableLabels>()
             InsertableView<InsertableButtons>()
             InsertableView<InsertableLink>()