Add weighted search

Fixes #74

lib/controllers/bot_argument_suggestions.dart

@@ -5,6 +5,7 @@ import "package:nexus/controllers/members_by_status.dart";
 import "package:nexus/controllers/rooms.dart";
 import "package:nexus/controllers/via.dart";
 import "package:nexus/helpers/extensions/get_localpart.dart";
+import "package:nexus/helpers/extensions/weighted_search.dart";
 import "package:nexus/models/bot_argument_suggestion.dart";
 import "package:nexus/models/bot_command_draft.dart";
 import "package:nexus/models/content/bot_command_description.dart";
@@ -91,13 +92,10 @@ class BotArgumentSuggestionsController(final String roomId)
               )
               .nonNulls,
         )
-        .where(
+        .where((suggestion) => !picked.contains(suggestion.text))
-          (suggestion) =>
+        .search(
-              !picked.contains(suggestion.text) &&
+          query,
-              [
+          (suggestion) => [(suggestion.title, 2), (suggestion.subtitle, 1)],
-                suggestion.title,
-                suggestion.subtitle,
-              ].any((text) => text?.toLowerCase().contains(query) == true),
         )
         .take(8)
         .toIList();

lib/helpers/extensions/weighted_search.dart

@@ -0,0 +1,47 @@
+import "package:collection/collection.dart";
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+
+extension WeightedSearch<T> on Iterable<T> {
+  /// The items with a field matching [query], best match first.
+  IList<T> search(
+    String query,
+    Iterable<(String?, int)> Function(T item) fieldsOf,
+  ) {
+    final needle = query.trim().toLowerCase();
+    if (needle.isEmpty) return toIList();
+
+    int qualityOf(String text) {
+      final haystack = text.toLowerCase();
+      if (haystack == needle) return 4;
+      if (haystack.startsWith(needle)) return 3;
+      if (haystack
+          .split(RegExp(r"[\s_\-:/.@#!]+"))
+          .any((w) => w.startsWith(needle))) {
+        return 2;
+      }
+      if (haystack.contains(needle)) return 1;
+      return 0;
+    }
+
+    return .new(
+      map(
+            (item) => (
+              item,
+              fieldsOf(item)
+                      .map(
+                        (field) => switch (field) {
+                          (final text?, final weight) =>
+                            qualityOf(text) * weight,
+                          (null, _) => 0,
+                        },
+                      )
+                      .maxOrNull ??
+                  0,
+            ),
+          )
+          .where((scored) => scored.$2 > 0)
+          .sortedBy((scored) => -scored.$2)
+          .map((scored) => scored.$1),
+    );
+  }
+}

lib/widgets/composer/overlays/emoji_overlay.dart

@@ -3,6 +3,7 @@ import "package:hooks_riverpod/hooks_riverpod.dart";
 import "package:material_ui/material_ui.dart";
 import "package:nexus/controllers/all_emoji.dart";
 import "package:nexus/helpers/extensions/better_when.dart";
+import "package:nexus/helpers/extensions/weighted_search.dart";
 import "package:nexus/models/content/image_pack.dart";
 import "package:nexus/models/image_pack.dart";
 
@@ -21,11 +22,13 @@ class const EmojiOverlay(
           children: emojis
               .map((element) => element.emojis)
               .flattened
-              .where(
+              .search(
-                (emoji) =>
+                query,
-                    emoji.aliases.join().contains(query) ||
+                (emoji) => [
-                    emoji.description.contains(query) ||
+                  ...emoji.aliases.map((alias) => (alias, 3)),
-                    emoji.tags.join().contains(query),
+                  ...emoji.tags.map((tag) => (tag, 2)),
+                  (emoji.description, 1),
+                ],
               )
               .map(
                 (emoji) => ListTile(

lib/widgets/composer/overlays/room_overlay.dart

@@ -2,6 +2,7 @@ import "package:hooks_riverpod/hooks_riverpod.dart";
 import "package:material_ui/material_ui.dart";
 import "package:nexus/controllers/rooms.dart";
 import "package:nexus/controllers/via.dart";
+import "package:nexus/helpers/extensions/weighted_search.dart";
 import "package:nexus/widgets/avatar_or_hash.dart";
 
 class const RoomOverlay(
@@ -14,14 +15,15 @@ class const RoomOverlay(
   Widget build(BuildContext context, WidgetRef ref) {
     final rooms = ref.watch(RoomsController.provider);
     return ListView(
-      children:
+      children: rooms.values
-          (query.isEmpty
+          .search(
-                  ? rooms.values
+            query,
-                  : rooms.values.where(
+            (room) => [
-                      (room) => (room.metadata?.name ?? room.metadata?.id ?? "")
+              (room.metadata?.name, 3),
-                          .toLowerCase()
+              (room.metadata?.canonicalAlias, 2),
-                          .contains(query.toLowerCase()),
+              (room.metadata?.id, 1),
-                    ))
+            ],
+          )
           .map((room) {
             final name =
                 room.metadata?.name ??
@@ -39,9 +41,7 @@ class const RoomOverlay(
                   ? null
                   : Text(room.metadata!.topic!, maxLines: 1),
               onTap: () {
-                    final vias = ref
+                final vias = ref.watch(ViaController.provider(room)).viaQuery;
-                        .watch(ViaController.provider(room))
-                        .viaQuery;
                 addTag(
                   id: "[#$name](matrix:roomid/${room.metadata?.id.substring(1)}$vias)",
                   name:

lib/widgets/composer/overlays/user_overlay.dart

@@ -3,6 +3,7 @@ import "package:material_ui/material_ui.dart";
 import "package:nexus/controllers/members_by_status.dart";
 import "package:nexus/helpers/extensions/better_when.dart";
 import "package:nexus/helpers/extensions/get_localpart.dart";
+import "package:nexus/helpers/extensions/weighted_search.dart";
 import "package:nexus/models/content/membership.dart";
 import "package:nexus/widgets/avatar_or_hash.dart";
 
@@ -20,24 +21,15 @@ class const UserOverlay(
       )
       .betterWhen(
         data: (members) => ListView(
-          children:
+          children: members
-              (query.isEmpty
+              .search(
-                      ? members
+                query,
-                      : members.where(
+                (member) => [
-                          (member) =>
+                  if (member.content case MembershipContent(:final displayName))
-                              member.stateKey?.toLowerCase().contains(
+                    (displayName, 2),
-                                    query.toLowerCase(),
+                  (member.stateKey, 1),
-                                  ) ==
+                ],
-                                  true ||
+              )
-                              switch (member.content) {
-                                MembershipContent(:final displayName) =>
-                                  displayName?.toLowerCase().contains(
-                                        query.toLowerCase(),
-                                      ) ==
-                                      true,
-                                _ => false,
-                              },
-                        ))
               .map(
                 (member) => switch (member.content) {
                   MembershipContent(:final displayName, :final avatarUrl) =>
@@ -46,9 +38,7 @@ class const UserOverlay(
                         avatarUrl,
                         displayName ?? member.stateKey!.localpart,
                       ),
-                          title: Text(
+                      title: Text(displayName ?? member.stateKey!.localpart),
-                            displayName ?? member.stateKey!.localpart,
-                          ),
                       subtitle: Text(member.stateKey!),
                       onTap: () => addTag(
                         id: "[@$displayName](matrix:u/${member.stateKey!.substring(1)})",

lib/widgets/settings/search_chooser.dart

@@ -1,6 +1,7 @@
 import "package:fast_immutable_collections/fast_immutable_collections.dart";
 import "package:flutter_hooks/flutter_hooks.dart";
 import "package:material_ui/material_ui.dart";
+import "package:nexus/helpers/extensions/weighted_search.dart";
 
 /// The [chosen] items, above a field searching [options] to choose more.
 class const SearchChooser({
@@ -30,15 +31,10 @@ class const SearchChooser({
 }) extends HookWidget {
   @override
   Widget build(BuildContext context) {
-    final query = useValueListenable(controller).text.trim().toLowerCase();
+    final query = useValueListenable(controller).text;
     final shown = options
-        .where(
+        .where((id) => !chosen.contains(id))
-          (id) =>
+        .search(query, (id) => [(nameOf(id), 2), (id, 1)]);
-              !chosen.contains(id) &&
-              (nameOf(id).toLowerCase().contains(query) ||
-                  id.toLowerCase().contains(query)),
-        )
-        .toIList();
 
     ListTile tileOf(String id, {Widget? trailing, VoidCallback? onTap}) =>
         ListTile(

lib/widgets/settings/settings_layout.dart

@@ -7,6 +7,7 @@ import "package:hooks_riverpod/misc.dart";
 import "package:m3e_card_list/m3e_card_list.dart";
 import "package:navigation_rail_m3e/navigation_rail_m3e.dart";
 import "package:nexus/helpers/extensions/better_when.dart";
+import "package:nexus/helpers/extensions/weighted_search.dart";
 import "package:nexus/models/settings_category.dart";
 import "package:nexus/widgets/pages/settings_category.dart";
 import "package:nexus/widgets/divider_text.dart";
@@ -43,32 +44,22 @@ class const SettingsLayout({
             // Only searched once shown, by which point these have loaded
             final categories =
                 ref.read(sectionsProvider).value ?? const IMap.empty();
-            final query = controller.text.toLowerCase();
-
             final matches = categories.values.flattenedToList
                 .asMap()
                 .entries
                 .expand(
-                  (categoryEntry) => categoryEntry.value.settings
+                  (categoryEntry) =>
-                      .asMap()
+                      categoryEntry.value.settings.asMap().entries.map(
-                      .entries
-                      .where(
-                        (settingEntry) =>
-                            settingEntry.value.title.toLowerCase().contains(
-                              query,
-                            ) ||
-                            settingEntry.value.description
-                                .toLowerCase()
-                                .contains(query),
-                      )
-                      .map(
                         (settingEntry) => (
                           (categoryEntry.key, settingEntry.key),
                           settingEntry.value,
                         ),
                       ),
                 )
-                .toIList();
+                .search(
+                  controller.text,
+                  (match) => [(match.$2.title, 2), (match.$2.description, 1)],
+                );
 
             return matches.map(
               (match) => ListTile(

lib/widgets/timezone_field.dart

@@ -4,6 +4,7 @@ import "package:hooks_riverpod/hooks_riverpod.dart";
 import "package:material_ui/material_ui.dart";
 import "package:material_adaptive_sheets/material_adaptive_sheets.dart";
 import "package:nexus/controllers/timezones.dart";
+import "package:nexus/helpers/extensions/weighted_search.dart";
 import "package:nexus/helpers/hooks/saving.dart";
 import "package:nexus/widgets/settings/inline_text_field.dart";
 import "package:timezone/timezone.dart";
@@ -84,7 +85,7 @@ class const TimezoneField({
               onTap: () => choose(controller, null),
             ),
           ...timezones
-              .where((timezone) => timezone.toLowerCase().contains(query))
+              .search(query, (timezone) => [(timezone, 1)])
               .map(
                 (timezone) => ListTile(
                   leading: Icon(