Add 'Clear Log' Button

Flow.Launcher/Languages/en.xaml

@@ -165,6 +165,8 @@
     <system:String x:Key="devtool">DevTools</system:String>
     <system:String x:Key="settingfolder">Setting Folder</system:String>
     <system:String x:Key="logfolder">Log Folder</system:String>
+    <system:String x:Key="clearlogfolder">Clear Logs</system:String>
+    <system:String x:Key="clearlogfolderMessage">Are you sure you want to delete all logs?</system:String>
     <system:String x:Key="welcomewindow">Wizard</system:String>
 
     <!--  FileManager Setting Dialog  -->

Flow.Launcher/SettingWindow.xaml

@@ -2538,6 +2538,11 @@
                                                 Margin="0,0,12,0"
                                                 Click="OpenSettingFolder"
                                                 Content="{DynamicResource settingfolder}" />
+                                            <Button
+                                                Name="ClearLogFolderBtn"
+                                                Margin="0,0,12,0"
+                                                Click="ClearLogFolder"
+                                                Content="{Binding CheckLogFolder, UpdateSourceTrigger=PropertyChanged}" />
                                             <Button Click="OpenLogFolder" Content="{DynamicResource logfolder}" />
                                         </StackPanel>
                                         <TextBlock Style="{StaticResource Glyph}">

Flow.Launcher/SettingWindow.xaml.cs

@@ -14,6 +14,7 @@
 using ModernWpf;
 using System;
 using System.IO;
+using System.Linq;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Forms;
@@ -270,6 +271,20 @@ private void OpenLogFolder(object sender, RoutedEventArgs e)
         {
             PluginManager.API.OpenDirectory(Path.Combine(DataLocation.DataDirectory(), Constant.Logs, Constant.Version));
         }
+        private void ClearLogFolder(object sender, RoutedEventArgs e)
+        {
+            var confirmResult = MessageBox.Show(
+                InternationalizationManager.Instance.GetTranslation("clearlogfolderMessage"),
+                InternationalizationManager.Instance.GetTranslation("clearlogfolder"), 
+                MessageBoxButton.YesNo);
+
+            if (confirmResult == MessageBoxResult.Yes)
+            {
+                viewModel.ClearLogFolder();
+
+                ClearLogFolderBtn.Content = viewModel.CheckLogFolder;
+            }
+        }
 
         private void OnPluginStoreRefreshClick(object sender, RoutedEventArgs e)
         {

Flow.Launcher/ViewModel/SettingWindowViewModel.cs

@@ -576,6 +576,45 @@ public FamilyTypeface SelectedResultFontFaces
         public string Github => Constant.GitHub;
         public static string Version => Constant.Version;
         public string ActivatedTimes => string.Format(_translater.GetTranslation("about_activate_times"), Settings.ActivateTimes);
+
+        public string CheckLogFolder
+        {
+            get 
+            {
+                var dirInfo = new DirectoryInfo(Path.Combine(DataLocation.DataDirectory(), Constant.Logs, Constant.Version));
+                long size = dirInfo.EnumerateFiles("*", SearchOption.AllDirectories).Sum(file => file.Length);
+
+                return _translater.GetTranslation("clearlogfolder") + " (" + FormatBytes(size) + ")" ;
+            }
+        }
+
+        internal void ClearLogFolder()
+        {
+            var directory = new DirectoryInfo(
+                                        Path.Combine(
+                                            DataLocation.DataDirectory(),
+                                            Constant.Logs,
+                                            Constant.Version));
+
+            directory.EnumerateFiles()
+                     .ToList()
+                     .ForEach(x => x.Delete());
+        }
+        internal string FormatBytes(long bytes)
+        {
+            const int scale = 1024;
+            string[] orders = new string[] { "GB", "MB", "KB", "Bytes" };
+            long max = (long)Math.Pow(scale, orders.Length - 1);
+
+            foreach (string order in orders)
+            {
+                if (bytes > max)
+                    return string.Format("{0:##.##} {1}", decimal.Divide(bytes, max), order);
+
+                max /= scale;
+            }
+            return "0 Bytes";
+        }
         #endregion
     }
 }