Support Querying Results When Query Text is Empty

Flow.Launcher.Core/Plugin/PluginManager.cs

@@ -25,6 +25,7 @@ public static class PluginManager
         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();
@@ -220,13 +221,16 @@ public static async Task InitializePluginsAsync()
                 {
                     API.LogException(ClassName, $"Fail to Init plugin: {pair.Metadata.Name}", e);
                     pair.Metadata.Disabled = true;
+                    pair.Metadata.HomeDisabled = true;
                     failedPlugins.Enqueue(pair);
                 }
             }));
 
             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 +278,11 @@ public static ICollection<PluginPair> ValidPluginsForQuery(Query query)
             };
         }
 
+        public static ICollection<PluginPair> ValidPluginsForHomeQuery()
+        {
+            return _homePlugins.ToList();
+        }
+
         public static async Task<List<Result>> QueryForPluginAsync(PluginPair pair, Query query, CancellationToken token)
         {
             var results = new List<Result>();
@@ -318,6 +327,36 @@ public static async Task<List<Result>> QueryForPluginAsync(PluginPair pair, Quer
             return results;
         }
 
+        public static async Task<List<Result>> QueryHomeForPluginAsync(PluginPair pair, Query query, 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, query);
+
+                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)
@@ -378,6 +417,11 @@ public static List<Result> GetContextMenusForPlugin(Result result)
             return results;
         }
 
+        public static bool IsHomePlugin(string id)
+        {
+            return _homePlugins.Any(p => p.Metadata.ID == id);
+        }
+
         public static bool ActionKeywordRegistered(string actionKeyword)
         {
             // this method is only checking for action keywords (defined as not '*') registration

Flow.Launcher.Core/Plugin/QueryBuilder.cs

@@ -8,10 +8,23 @@ public static class QueryBuilder
     {
         public static Query Build(string text, Dictionary<string, PluginPair> nonGlobalPlugins)
         {
+            // home query
+            if (string.IsNullOrEmpty(text))
+            {
+                return new Query()
+                {
+                    Search = string.Empty,
+                    RawQuery = string.Empty,
+                    SearchTerms = Array.Empty<string>(),
+                    ActionKeyword = string.Empty
+                };
+            }
+
             // replace multiple white spaces with one white space
             var terms = text.Split(Query.TermSeparator, StringSplitOptions.RemoveEmptyEntries);
             if (terms.Length == 0)
-            { // nothing was typed
+            {
+                // nothing was typed
                 return null;
             }
 
@@ -21,13 +34,15 @@ public static Query Build(string text, Dictionary<string, PluginPair> nonGlobalP
             string[] searchTerms;
 
             if (nonGlobalPlugins.TryGetValue(possibleActionKeyword, out var pluginPair) && !pluginPair.Metadata.Disabled)
-            { // use non global plugin for query
+            {
+                // use non global plugin for query
                 actionKeyword = possibleActionKeyword;
                 search = terms.Length > 1 ? rawQuery[(actionKeyword.Length + 1)..].TrimStart() : string.Empty;
                 searchTerms = terms[1..];
             }
             else
-            { // non action keyword
+            {
+                // non action keyword
                 actionKeyword = string.Empty;
                 search = rawQuery.TrimStart();
                 searchTerms = terms;

Flow.Launcher.Infrastructure/UserSettings/PluginSettings.cs

@@ -67,6 +67,7 @@ public void UpdatePluginSettings(List<PluginMetadata> metadatas)
                     metadata.Disabled = settings.Disabled;
                     metadata.Priority = settings.Priority;
                     metadata.SearchDelayTime = settings.SearchDelayTime;
+                    metadata.HomeDisabled = settings.HomeDisabled;
                 }
                 else
                 {
@@ -79,6 +80,7 @@ public void UpdatePluginSettings(List<PluginMetadata> metadatas)
                         DefaultActionKeywords = metadata.ActionKeywords, // metadata provides default values
                         ActionKeywords = metadata.ActionKeywords, // use default value
                         Disabled = metadata.Disabled,
+                        HomeDisabled = metadata.HomeDisabled,
                         Priority = metadata.Priority,
                         DefaultSearchDelayTime = metadata.SearchDelayTime, // metadata provides default values
                         SearchDelayTime = metadata.SearchDelayTime, // use default value
@@ -128,5 +130,6 @@ public class Plugin
         /// Used only to save the state of the plugin in settings
         /// </summary>
         public bool Disabled { get; set; }
+        public bool HomeDisabled { get; set; }
     }
 }

Flow.Launcher.Infrastructure/UserSettings/Settings.cs

@@ -158,6 +158,24 @@ public string PlaceholderText
                 }
             }
         }
+
+        private bool _showHomePage { get; set; } = true;
+        public bool ShowHomePage
+        {
+            get => _showHomePage;
+            set
+            {
+                if (_showHomePage != value)
+                {
+                    _showHomePage = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public bool ShowHistoryResultsForHomePage { get; set; } = false;
+        public int MaxHistoryResultsToShowForHomePage { get; set; } = 5;
+
         public int CustomExplorerIndex { get; set; } = 0;
 
         [JsonIgnore]

Flow.Launcher.Plugin/Interfaces/IAsyncHomeQuery.cs

@@ -0,0 +1,23 @@
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Flow.Launcher.Plugin
+{
+    /// <summary>
+    /// Asynchronous Query Model for Flow Launcher When Query Text is Empty
+    /// </summary>
+    public interface IAsyncHomeQuery : IFeatures
+    {
+        /// <summary>
+        /// Asynchronous Querying When Query Text is Empty
+        /// </summary>
+        /// <para>
+        /// If the Querying method requires high IO transmission
+        /// or performing CPU intense jobs (performing better with cancellation), please use this IAsyncHomeQuery interface
+        /// </para>
+        /// <param name="token">Cancel when querying job is obsolete</param>
+        /// <returns></returns>
+        Task<List<Result>> HomeQueryAsync(CancellationToken token);
+    }
+}

Flow.Launcher.Plugin/Interfaces/IHomeQuery.cs

@@ -0,0 +1,28 @@
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Flow.Launcher.Plugin
+{
+    /// <summary>
+    /// Synchronous Query Model for Flow Launcher When Query Text is Empty
+    /// <para>
+    /// If the Querying method requires high IO transmission
+    /// or performing CPU intense jobs (performing better with cancellation), please try the IAsyncHomeQuery interface
+    /// </para>
+    /// </summary>
+    public interface IHomeQuery : IAsyncHomeQuery
+    {
+        /// <summary>
+        /// Querying When Query Text is Empty
+        /// <para>
+        /// This method will be called within a Task.Run,
+        /// so please avoid synchronously wait for long.
+        /// </para>
+        /// </summary>
+        /// <returns></returns>
+        List<Result> HomeQuery();
+
+        Task<List<Result>> IAsyncHomeQuery.HomeQueryAsync(CancellationToken token) => Task.Run(HomeQuery);
+    }
+}

Flow.Launcher.Plugin/PluginMetadata.cs

@@ -50,6 +50,11 @@ public class PluginMetadata : BaseModel
         /// </summary>
         public bool Disabled { get; set; }
 
+        /// <summary>
+        /// Whether plugin is disabled in home query.
+        /// </summary>
+        public bool HomeDisabled { get; set; }
+
         /// <summary>
         /// Plugin execute file path.
         /// </summary>

Flow.Launcher/Languages/en.xaml

@@ -126,6 +126,11 @@
     <system:String x:Key="KoreanImeOpenLinkButton">Open</system:String>
     <system:String x:Key="KoreanImeRegistry">Use Previous Korean IME</system:String>
     <system:String x:Key="KoreanImeRegistryTooltip">You can change the Previous Korean IME settings directly from here</system:String>
+    <system:String x:Key="homePage">Home Page</system:String>
+    <system:String x:Key="homePageToolTip">Show home page results when query text is empty.</system:String>
+    <system:String x:Key="historyResultsForHomePage">Show History Results in Home Page</system:String>
+    <system:String x:Key="historyResultsCountForHomePage">Maximum History Results Shown in Home Page</system:String>
+    <system:String x:Key="homeToggleBoxToolTip">This can only be edited if plugin supports Home feature and Home Page is enabled.</system:String>
 
     <!--  Setting Plugin  -->
     <system:String x:Key="searchplugin">Search Plugin</system:String>
@@ -148,6 +153,7 @@
     <system:String x:Key="DisplayModeOnOff">Enabled</system:String>
     <system:String x:Key="DisplayModePriority">Priority</system:String>
     <system:String x:Key="DisplayModeSearchDelay">Search Delay</system:String>
+    <system:String x:Key="DisplayModeHomeOnOff">Home Page</system:String>
     <system:String x:Key="currentPriority">Current Priority</system:String>
     <system:String x:Key="newPriority">New Priority</system:String>
     <system:String x:Key="priority">Priority</system:String>
@@ -401,6 +407,10 @@
     <system:String x:Key="searchDelayTimeTitle">Search Delay Time Setting</system:String>
     <system:String x:Key="searchDelayTimeTips">Input the search delay time in ms you like to use for the plugin. Input empty if you don't want to specify any, and the plugin will use default search delay time.</system:String>
 
+    <!--  Search Delay Settings Dialog  -->
+    <system:String x:Key="homeTitle">Home Page</system:String>
+    <system:String x:Key="homeTips">Enable the plugin home page state if you like to show the plugin results when query is empty.</system:String>
+
     <!--  Custom Query Hotkey Dialog  -->
     <system:String x:Key="customeQueryHotkeyTitle">Custom Query Hotkey</system:String>
     <system:String x:Key="customeQueryHotkeyTips">Press a custom hotkey to open Flow Launcher and input the specified query automatically.</system:String>

Flow.Launcher/MainWindow.xaml.cs

@@ -277,6 +277,12 @@ private async void OnLoaded(object sender, RoutedEventArgs _)
                     case nameof(Settings.SettingWindowFont):
                         InitializeContextMenu();
                         break;
+                    case nameof(Settings.ShowHomePage):
+                        if (_viewModel.QueryResultsSelected() && string.IsNullOrEmpty(_viewModel.QueryText))
+                        {
+                            _viewModel.QueryResults();
+                        }
+                        break;
                 }
             };
 
@@ -292,6 +298,12 @@ private async void OnLoaded(object sender, RoutedEventArgs _)
             DependencyPropertyDescriptor
                 .FromProperty(VisibilityProperty, typeof(StackPanel))
                 .AddValueChanged(History, (s, e) => UpdateClockPanelVisibility());
+
+            // Initialize query state
+            if (_settings.ShowHomePage && string.IsNullOrEmpty(_viewModel.QueryText))
+            {
+                _viewModel.QueryResults();
+            }
         }
 
         private async void OnClosing(object sender, CancelEventArgs e)

Flow.Launcher/Resources/Controls/InstalledPluginDisplay.xaml

@@ -100,10 +100,19 @@
                                 ToolTipService.InitialShowDelay="0"
                                 ToolTipService.ShowOnDisabled="True"
                                 Value="{Binding PluginSearchDelayTime, Mode=TwoWay}" />
-
                         </StackPanel>
 
                         <!--  Put OnOffControl after PriorityControl & SearchDelayControl so that it can display correctly  -->
+                        <ui:ToggleSwitch
+                            x:Name="HomeOnOffControl"
+                            Margin="0 0 8 0"
+                            IsEnabled="{Binding HomeEnabled}"
+                            IsOn="{Binding PluginHomeState}"
+                            OffContent="{DynamicResource disable}"
+                            OnContent="{DynamicResource enable}"
+                            ToolTip="{DynamicResource homeToggleBoxToolTip}"
+                            Visibility="{Binding DataContext.IsHomeOnOffSelected, RelativeSource={RelativeSource AncestorType=ListBox}, Converter={StaticResource BooleanToVisibilityConverter}}" />
+
                         <ui:ToggleSwitch
                             x:Name="OnOffControl"
                             Margin="0 0 8 0"

Flow.Launcher/SettingPages/ViewModels/SettingsPaneGeneralViewModel.cs

@@ -154,11 +154,22 @@ public int SearchDelayTimeValue
             {
                 Settings.SearchDelayTime = value;
                 OnPropertyChanged();
-                OnPropertyChanged(nameof(SearchDelayTimeDisplay));
             }
         }
     }
-    public string SearchDelayTimeDisplay => $"{SearchDelayTimeValue}ms";
+
+    public int MaxHistoryResultsToShowValue
+    {
+        get => Settings.MaxHistoryResultsToShowForHomePage;
+        set
+        {
+            if (Settings.MaxHistoryResultsToShowForHomePage != value)
+            {
+                Settings.MaxHistoryResultsToShowForHomePage = value;
+                OnPropertyChanged();
+            }
+        }
+    }
 
     private void UpdateEnumDropdownLocalizations()
     {