Organize expanded custom emoji picker by category

Closes #223

Pachyderm/Sources/Pachyderm/Model/Emoji.swift

@@ -16,6 +16,7 @@ public class Emoji: Codable {
     public let url: WebURL
     public let staticURL: WebURL
     public let visibleInPicker: Bool
+    public let category: String?
     
     public required init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: CodingKeys.self)
@@ -24,6 +25,7 @@ public class Emoji: Codable {
         self.url = try container.decode(WebURL.self, forKey: .url)
         self.staticURL = try container.decode(WebURL.self, forKey: .staticURL)
         self.visibleInPicker = try container.decode(Bool.self, forKey: .visibleInPicker)
+        self.category = try container.decodeIfPresent(String.self, forKey: .category)
     }
     
     private enum CodingKeys: String, CodingKey {
@@ -31,6 +33,7 @@ public class Emoji: Codable {
         case url
         case staticURL = "static_url"
         case visibleInPicker = "visible_in_picker"
+        case category
     }
 }
 

Tusker/Screens/Compose/ComposeAutocompleteView.swift

@@ -176,6 +176,19 @@ struct ComposeAutocompleteEmojisView: View {
     @State private var emojis: [Emoji] = []
     @ScaledMetric private var emojiSize = 30
     
+    private var emojisBySection: [String: [Emoji]] {
+        var values: [String: [Emoji]] = [:]
+        for emoji in emojis {
+            let key = emoji.category ?? ""
+            if !values.keys.contains(key) {
+                values[key] = [emoji]
+            } else {
+                values[key]!.append(emoji)
+            }
+        }
+        return values
+    }
+    
     var body: some View {
         // When exapnded, the toggle button should be at the top. When collapsed, it should be centered.
         HStack(alignment: expanded ? .top : .center, spacing: 0) {
@@ -214,7 +227,9 @@ struct ComposeAutocompleteEmojisView: View {
     private var verticalGrid: some View {
         ScrollView {
             LazyVGrid(columns: [GridItem(.adaptive(minimum: emojiSize), spacing: 4)]) {
-                ForEach(emojis, id: \.shortcode) { (emoji) in
+                ForEach(emojisBySection.keys.sorted(), id: \.self) { section in
+                    Section {
+                        ForEach(emojisBySection[section]!, id: \.shortcode) { emoji in
                             Button {
                                 uiState.currentInput?.autocomplete(with: ":\(emoji.shortcode):")
                             } label: {
@@ -222,6 +237,20 @@ struct ComposeAutocompleteEmojisView: View {
                                     .frame(height: emojiSize)
                             }
                         }
+                    } header: {
+                        if !section.isEmpty {
+                            VStack(alignment: .leading, spacing: 2) {
+                                Text(section)
+                                    .font(.caption)
+                                
+                                Rectangle()
+                                    .foregroundColor(Color(.separator))
+                                    .frame(height: 0.5)
+                            }
+                            .padding(.top, 4)
+                        }
+                    }
+                }
             }
             .padding(.all, 8)
         }