"Recent" menu implemented (#585)

* Refactoring CommandHistoryService to prepare "Recent" menu item feature.

* "Recent" menu implemented, but still not bound to commands.

* "Recent" menu implemented.

FluentTerminal.App.ViewModels/MainViewModel.cs

@@ -18,12 +18,19 @@ namespace FluentTerminal.App.ViewModels
 {
     public class MainViewModel : ViewModelBase
     {
+        #region Constants
+
+        private const int RecentItemsMaxCount = 10;
+
+        #endregion Constants
+
         private readonly IClipboardService _clipboardService;
         private readonly IDialogService _dialogService;
         private readonly IDispatcherTimer _dispatcherTimer;
         private readonly IKeyboardCommandService _keyboardCommandService;
         private readonly ISettingsService _settingsService;
         private readonly ITrayProcessCommunicationService _trayProcessCommunicationService;
+        private readonly ICommandHistoryService _commandHistoryService;
         private ApplicationSettings _applicationSettings;
         private string _background;
         private double _backgroundOpacity;
@@ -32,8 +39,8 @@ namespace FluentTerminal.App.ViewModels
         private string _windowTitle;
         private List<KeyBinding> _keyBindings;
 
-        public MainViewModel(ISettingsService settingsService, ITrayProcessCommunicationService trayProcessCommunicationService, IDialogService dialogService, IKeyboardCommandService keyboardCommandService,
-            IApplicationView applicationView, IDispatcherTimer dispatcherTimer, IClipboardService clipboardService)
+        public MainViewModel(ISettingsService settingsService, ITrayProcessCommunicationService trayProcessCommunicationService, IDialogService dialogService, IKeyboardCommandService keyboardCommandService, 
+            IApplicationView applicationView, IDispatcherTimer dispatcherTimer, IClipboardService clipboardService, ICommandHistoryService commandHistoryService)
         {
             MessengerInstance.Register<ApplicationSettingsChangedMessage>(this, OnApplicationSettingsChanged);
             MessengerInstance.Register<CurrentThemeChangedMessage>(this, OnCurrentThemeChanged);
@@ -42,6 +49,7 @@ namespace FluentTerminal.App.ViewModels
             MessengerInstance.Register<SshProfileAddedMessage>(this, OnSshProfileAdded);
             MessengerInstance.Register<SshProfileDeletedMessage>(this, OnSshProfileDeleted);
             MessengerInstance.Register<TerminalOptionsChangedMessage>(this, OnTerminalOptionsChanged);
+            MessengerInstance.Register<CommandHistoryChangedMessage>(this, OnCommandHistoryChanged);
 
             _settingsService = settingsService;
 
@@ -51,6 +59,8 @@ namespace FluentTerminal.App.ViewModels
             _dispatcherTimer = dispatcherTimer;
             _clipboardService = clipboardService;
             _keyboardCommandService = keyboardCommandService;
+            _commandHistoryService = commandHistoryService;
+
             _keyboardCommandService.RegisterCommandHandler(nameof(Command.NewTab), async () => await AddLocalTabAsync());
             _keyboardCommandService.RegisterCommandHandler(nameof(Command.NewSshTab), async () => await AddSshTabAsync());
             _keyboardCommandService.RegisterCommandHandler(nameof(Command.NewCustomCommandTab), async () => await AddCustomCommandTabAsync());
@@ -113,6 +123,24 @@ namespace FluentTerminal.App.ViewModels
             MessengerInstance.Register<KeyBindingsChangedMessage>(this, message => LoadKeyBindings());
         }
 
+        private IList<ProfileCommandViewModel> _recentCommands;
+
+        public IList<ProfileCommandViewModel> RecentCommands
+        {
+            get => _recentCommands ?? (_recentCommands = _commandHistoryService
+                       .GetHistoryRecentFirst(top: RecentItemsMaxCount).Select(c =>
+                           new ProfileCommandViewModel(c.ShellProfile,
+                               new RelayCommand(() => AddTerminalAsync(c.ShellProfile)))).ToList());
+            private set => Set(ref _recentCommands, value);
+        }
+
+        private void OnCommandHistoryChanged(CommandHistoryChangedMessage message)
+        {
+            _recentCommands = null;
+
+            ApplicationView.RunOnDispatcherThread(() => RaisePropertyChanged(nameof(RecentCommands)), false);
+        }
+
         private void LoadKeyBindings() =>
             _keyBindings = _settingsService.GetCommandKeyBindings().Values.SelectMany(v => v).ToList();
 
@@ -371,6 +399,8 @@ namespace FluentTerminal.App.ViewModels
 
         public Task AddTerminalAsync(ShellProfile profile, string terminalState, int position)
         {
+            profile.Tag = new DelayedHistorySaver(() => _commandHistoryService.MarkUsed(profile));
+
             return ApplicationView.RunOnDispatcherThread(() =>
             {
                 var terminal = new TerminalViewModel(_settingsService, _trayProcessCommunicationService, _dialogService, _keyboardCommandService,