fetch emoji list from gemoji for a more complete emoji list

lib/controllers/emoji_controller.dart

@@ -0,0 +1,88 @@
+import "dart:convert";
+import "package:emoji_text_field/models/emoji_category.dart";
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:flutter/material.dart";
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:http/http.dart";
+import "package:nexus/models/emoji.dart";
+
+typedef EmojiTuple = (IMap<String, EmojiCategory>, IMap<String, List<String>>);
+
+class EmojiController extends AsyncNotifier<EmojiTuple> {
+  @override
+  Future<EmojiTuple> build() async {
+    final response = await get(
+      Uri.https(
+        "github.com",
+        "github/gemoji/raw/refs/heads/master/db/emoji.json",
+      ),
+    );
+
+    if (response.statusCode != 200) {
+      throw Exception("Failed to load emoji data");
+    }
+
+    final data = json.decode(response.body);
+
+    final entries = (data as List)
+        .cast<Map<String, dynamic>>()
+        .map(Emoji.fromJson)
+        .toIList();
+
+    final categoryMap = entries.fold<IMap<String, IList<String>>>(
+      const IMap.empty(),
+      (acc, entry) => acc.update(
+        entry.category,
+        (list) => list.add(entry.emoji),
+        ifAbsent: () => IList([entry.emoji]),
+      ),
+    );
+
+    final keywordMap = entries.fold<IMap<String, IList<String>>>(
+      const IMap.empty(),
+      (acc, entry) => acc.add(
+        entry.emoji,
+        IList<String>([...entry.tags, ...entry.aliases, entry.description]),
+      ),
+    );
+
+    final customCategories = IMap.fromEntries(
+      categoryMap.entries.map(
+        (entry) => MapEntry(
+          entry.key,
+          EmojiCategory(
+            name: entry.key,
+            icon: switch (entry.key) {
+              "Smileys & Emotion" => Icons.emoji_emotions,
+              "People & Body" => Icons.emoji_people,
+              "Animals & Nature" => Icons.emoji_nature,
+              "Food & Drink" => Icons.emoji_food_beverage,
+              "Travel & Places" => Icons.travel_explore,
+              "Activities" => Icons.sports_soccer,
+              "Objects" => Icons.emoji_objects,
+              "Symbols" => Icons.emoji_symbols,
+              "Flags" => Icons.emoji_flags,
+              _ => Icons.category,
+            },
+            emojis: entry.value.toList(growable: false),
+          ),
+        ),
+      ),
+    );
+
+    final customKeywords = IMap(
+      Map.fromEntries(
+        keywordMap.entries.map(
+          (e) => MapEntry(e.key, e.value.toList(growable: false)),
+        ),
+      ),
+    );
+
+    return (customCategories, customKeywords);
+  }
+
+  static final provider =
+      AsyncNotifierProvider.autoDispose<EmojiController, EmojiTuple>(
+        EmojiController.new,
+      );
+}