Support query for plugins with home query interface

Flow.Launcher.Core/Plugin/PluginManager.cs

@@ -25,6 +25,7 @@ namespace Flow.Launcher.Core.Plugin
         private static readonly string ClassName = nameof(PluginManager);
 
         private static IEnumerable<PluginPair> _contextMenuPlugins;
+        private static IEnumerable<PluginPair> _homePlugins;
 
         public static List<PluginPair> AllPlugins { get; private set; }
         public static readonly HashSet<PluginPair> GlobalPlugins = new();
@@ -227,6 +228,8 @@ namespace Flow.Launcher.Core.Plugin
             await Task.WhenAll(InitTasks);
 
             _contextMenuPlugins = GetPluginsForInterface<IContextMenu>();
+            _homePlugins = GetPluginsForInterface<IAsyncHomeQuery>();
+
             foreach (var plugin in AllPlugins)
             {
                 // set distinct on each plugin's action keywords helps only firing global(*) and action keywords once where a plugin
@@ -274,6 +277,14 @@ namespace Flow.Launcher.Core.Plugin
             };
         }
 
+        public static ICollection<PluginPair> ValidPluginsForHomeQuery(Query query)
+        {
+            if (query is not null)
+                return Array.Empty<PluginPair>();
+
+            return _homePlugins.ToList();
+        }
+
         public static async Task<List<Result>> QueryForPluginAsync(PluginPair pair, Query query, CancellationToken token)
         {
             var results = new List<Result>();
@@ -318,6 +329,36 @@ namespace Flow.Launcher.Core.Plugin
             return results;
         }
 
+        public static async Task<List<Result>> QueryHomeForPluginAsync(PluginPair pair, CancellationToken token)
+        {
+            var results = new List<Result>();
+            var metadata = pair.Metadata;
+
+            try
+            {
+                var milliseconds = await API.StopwatchLogDebugAsync(ClassName, $"Cost for {metadata.Name}",
+                    async () => results = await ((IAsyncHomeQuery)pair.Plugin).HomeQueryAsync(token).ConfigureAwait(false));
+
+                token.ThrowIfCancellationRequested();
+                if (results == null)
+                    return null;
+                UpdatePluginMetadata(results, metadata);
+
+                token.ThrowIfCancellationRequested();
+            }
+            catch (OperationCanceledException)
+            {
+                // null will be fine since the results will only be added into queue if the token hasn't been cancelled
+                return null;
+            }
+            catch (Exception e)
+            {
+                API.LogException(ClassName, $"Failed to query home for plugin: {metadata.Name}", e);
+                return null;
+            }
+            return results;
+        }
+
         public static void UpdatePluginMetadata(IReadOnlyList<Result> results, PluginMetadata metadata, Query query)
         {
             foreach (var r in results)
@@ -333,6 +374,16 @@ namespace Flow.Launcher.Core.Plugin
             }
         }
 
+        private static void UpdatePluginMetadata(IReadOnlyList<Result> results, PluginMetadata metadata)
+        {
+            foreach (var r in results)
+            {
+                r.PluginDirectory = metadata.PluginDirectory;
+                r.PluginID = metadata.ID;
+                r.OriginQuery = null;
+            }
+        }
+
         /// <summary>
         /// get specified plugin, return null if not found
         /// </summary>

Flow.Launcher.Infrastructure/UserSettings/Settings.cs

@@ -158,6 +158,11 @@ namespace Flow.Launcher.Infrastructure.UserSettings
                 }
             }
         }
+
+        public bool ShowHomeQuery { get; set; } = true;
+        public bool ShowHistoryRecordsForHomeQuery { get; set; } = false;
+        public int HistoryRecordsCountForHomeQuery { get; set; } = 5;
+
         public int CustomExplorerIndex { get; set; } = 0;
 
         [JsonIgnore]

Flow.Launcher.Plugin/Result.cs

@@ -174,6 +174,9 @@ namespace Flow.Launcher.Plugin
         /// <summary>
         /// Query information associated with the result
         /// </summary>
+        /// <remarks>
+        /// If the query is for home query, this will be null
+        /// </remarks>
         internal Query OriginQuery { get; set; }
 
         /// <summary>

Flow.Launcher/ViewModel/MainViewModel.cs

@@ -1198,21 +1198,31 @@ namespace Flow.Launcher.ViewModel
             _updateSource?.Cancel();
 
             var query = await ConstructQueryAsync(QueryText, Settings.CustomShortcuts, Settings.BuiltinShortcuts);
+            var homeQuery = query == null;
+            ICollection<PluginPair> plugins = Array.Empty<PluginPair>();
 
             if (query == null) // shortcut expanded
             {
-                // Hide and clear results again because running query may show and add some results
-                Results.Visibility = Visibility.Collapsed;
-                Results.Clear();
+                if (Settings.ShowHomeQuery)
+                {
+                    plugins = PluginManager.ValidPluginsForHomeQuery(query);
+                }
+                
+                if (plugins.Count == 0)
+                {
+                    // Hide and clear results again because running query may show and add some results
+                    Results.Visibility = Visibility.Collapsed;
+                    Results.Clear();
 
-                // Reset plugin icon
-                PluginIconPath = null;
-                PluginIconSource = null;
-                SearchIconVisibility = Visibility.Visible;
+                    // Reset plugin icon
+                    PluginIconPath = null;
+                    PluginIconSource = null;
+                    SearchIconVisibility = Visibility.Visible;
 
-                // Hide progress bar again because running query may set this to visible
-                ProgressBarVisibility = Visibility.Hidden;
-                return;
+                    // Hide progress bar again because running query may set this to visible
+                    ProgressBarVisibility = Visibility.Hidden;
+                    return;
+                }
             }
 
             _updateSource = new CancellationTokenSource();
@@ -1226,27 +1236,37 @@ namespace Flow.Launcher.ViewModel
             if (_updateSource.Token.IsCancellationRequested) return;
 
             // Update the query's IsReQuery property to true if this is a re-query
-            query.IsReQuery = isReQuery;
+            if (!homeQuery) query.IsReQuery = isReQuery;
 
             // handle the exclusiveness of plugin using action keyword
             RemoveOldQueryResults(query);
 
             _lastQuery = query;
 
-            var plugins = PluginManager.ValidPluginsForQuery(query);
-
-            if (plugins.Count == 1)
-            {
-                PluginIconPath = plugins.Single().Metadata.IcoPath;
-                PluginIconSource = await App.API.LoadImageAsync(PluginIconPath);
-                SearchIconVisibility = Visibility.Hidden;
-            }
-            else
+            if (homeQuery)
             {
+                // Do not show plugin icon if this is a home query
                 PluginIconPath = null;
                 PluginIconSource = null;
                 SearchIconVisibility = Visibility.Visible;
             }
+            else
+            {
+                plugins = PluginManager.ValidPluginsForQuery(query);
+
+                if (plugins.Count == 1)
+                {
+                    PluginIconPath = plugins.Single().Metadata.IcoPath;
+                    PluginIconSource = await App.API.LoadImageAsync(PluginIconPath);
+                    SearchIconVisibility = Visibility.Hidden;
+                }
+                else
+                {
+                    PluginIconPath = null;
+                    PluginIconSource = null;
+                    SearchIconVisibility = Visibility.Visible;
+                }
+            }
 
             // Do not wait for performance improvement
             /*if (string.IsNullOrEmpty(query.ActionKeyword))
@@ -1303,7 +1323,7 @@ namespace Flow.Launcher.ViewModel
             // Local function
             async Task QueryTaskAsync(PluginPair plugin, CancellationToken token)
             {
-                if (searchDelay)
+                if (searchDelay && !homeQuery) // Do not delay for home query
                 {
                     var searchDelayTime = plugin.Metadata.SearchDelayTime ?? Settings.SearchDelayTime;
 
@@ -1316,7 +1336,9 @@ namespace Flow.Launcher.ViewModel
                 // Task.Yield will force it to run in ThreadPool
                 await Task.Yield();
 
-                var results = await PluginManager.QueryForPluginAsync(plugin, query, token);
+                var results = homeQuery ?
+                    await PluginManager.QueryHomeForPluginAsync(plugin, token) :
+                    await PluginManager.QueryForPluginAsync(plugin, query, token);
 
                 if (token.IsCancellationRequested) return;
 
@@ -1616,7 +1638,7 @@ namespace Flow.Launcher.ViewModel
                     break;
                 case LastQueryMode.ActionKeywordPreserved:
                 case LastQueryMode.ActionKeywordSelected:
-                    var newQuery = _lastQuery.ActionKeyword;
+                    var newQuery = _lastQuery?.ActionKeyword;
 
                     if (!string.IsNullOrEmpty(newQuery))
                         newQuery += " ";