Add checkout local changes handling

This commit adds the local changes handling behavior for branch checkout.
One of three can be selected: stash and reapply after checkout, discard changes or leave them as is (previous behaviour)

src/Resources/Locales/en_US.axaml

@@ -53,6 +53,10 @@
   <x:String x:Key="Text.ChangeDisplayMode.Tree" xml:space="preserve">Show as Tree</x:String>
   <x:String x:Key="Text.Checkout" xml:space="preserve">Checkout Branch</x:String>
   <x:String x:Key="Text.Checkout.Target" xml:space="preserve">Target :</x:String>
+  <x:String x:Key="Text.Checkout.LocalChanges" xml:space="preserve">Local Changes :</x:String>
+  <x:String x:Key="Text.Checkout.LocalChanges.StashAndReply" xml:space="preserve">Stash &amp; Reapply</x:String>
+  <x:String x:Key="Text.Checkout.LocalChanges.Discard" xml:space="preserve">Discard</x:String>
+  <x:String x:Key="Text.Checkout.LocalChanges.Leave" xml:space="preserve">Leave</x:String>
   <x:String x:Key="Text.CherryPick" xml:space="preserve">Cherry-Pick This Commit</x:String>
   <x:String x:Key="Text.CherryPick.Commit" xml:space="preserve">Commit :</x:String>
   <x:String x:Key="Text.CherryPick.CommitChanges" xml:space="preserve">Commit all changes</x:String>

src/Resources/Locales/zh_CN.axaml

@@ -53,6 +53,10 @@
   <x:String x:Key="Text.ChangeDisplayMode.Tree" xml:space="preserve">树形模式</x:String>
   <x:String x:Key="Text.Checkout" xml:space="preserve">检出(checkout)分支</x:String>
   <x:String x:Key="Text.Checkout.Target" xml:space="preserve">目标分支 ：</x:String>
+  <x:String x:Key="Text.Checkout.LocalChanges" xml:space="preserve">未提交更改 ：</x:String>
+  <x:String x:Key="Text.Checkout.LocalChanges.StashAndReply" xml:space="preserve">贮藏(stash)并自动恢复</x:String>
+  <x:String x:Key="Text.Checkout.LocalChanges.Discard" xml:space="preserve">忽略</x:String>
+  <x:String x:Key="Text.Checkout.LocalChanges.Leave" xml:space="preserve">保持原样</x:String>
   <x:String x:Key="Text.CherryPick" xml:space="preserve">挑选(cherry-pick)此提交</x:String>
   <x:String x:Key="Text.CherryPick.Commit" xml:space="preserve">提交ID ：</x:String>
   <x:String x:Key="Text.CherryPick.CommitChanges" xml:space="preserve">提交变化</x:String>

src/ViewModels/Checkout.cs

@@ -9,27 +9,98 @@ namespace SourceGit.ViewModels
             get;
             private set;
         }
+        
+        public bool HasLocalChanges
+        {
+            get => _repo.WorkingCopyChangesCount > 0;
+        }
+
+        public bool LeaveLocalChanges
+        {
+            get => _leaveLocalChanges;
+            set => SetProperty(ref _leaveLocalChanges, value);
+        }
+
+        public bool DiscardLocalChanges
+        {
+            get => _discardLocalChanges;
+            set => SetProperty(ref _discardLocalChanges, value);
+        }
+
+        public bool StashLocalChanges
+        {
+            get => _stashLocalChanges;
+            set => SetProperty(ref _stashLocalChanges, value);
+        }
 
         public Checkout(Repository repo, string branch)
         {
             _repo = repo;
             Branch = branch;
             View = new Views.Checkout() { DataContext = this };
+
+            StashLocalChanges = true;
         }
 
         public override Task<bool> Sure()
         {
             _repo.SetWatcherEnabled(false);
             ProgressDescription = $"Checkout '{Branch}' ...";
+            var hasLocalChanges = HasLocalChanges;
 
             return Task.Run(() =>
             {
-                var succ = new Commands.Checkout(_repo.FullPath).Branch(Branch, SetProgressDescription);
+                var succ = false;
+                if (hasLocalChanges)
+                {
+                    if (DiscardLocalChanges)
+                    {
+                        SetProgressDescription("Discard local changes...");
+                        Commands.Discard.All(_repo.FullPath);
+                    }
+
+                    if (StashLocalChanges)
+                    {
+                        SetProgressDescription("Stash local changes...");
+                        succ = new Commands.Add(_repo.FullPath).Exec();
+                        succ = new Commands.Stash(_repo.FullPath).Push("CHECKOUT_AUTO_STASH");
+                    }
+                }
+                
+                SetProgressDescription("Checkout branch ...");
+                succ = new Commands.Checkout(_repo.FullPath).Branch(Branch, SetProgressDescription);
+                
+                if(hasLocalChanges && StashLocalChanges)
+                {
+                    SetProgressDescription("Re-apply local changes...");
+                    succ = new Commands.Stash(_repo.FullPath).Apply("stash@{0}");
+                    if (succ)
+                    {
+                        succ = new Commands.Stash(_repo.FullPath).Drop("stash@{0}");
+                    }
+                }
+                
                 CallUIThread(() => _repo.SetWatcherEnabled(true));
                 return succ;
             });
         }
+        
+        public static void ShowPopup(Repository repo, string branch)
+        {
+            var checkout = new Checkout(repo, branch);
+            if (repo.WorkingCopyChangesCount > 0)
+            {
+                PopupHost.ShowPopup(checkout);   
+            }
+            else
+            {
+                PopupHost.ShowAndStartPopup(checkout);
+            }
+        }
 
         private readonly Repository _repo;
+        private bool _leaveLocalChanges;
+        private bool _discardLocalChanges;
+        private bool _stashLocalChanges;
     }
 }

src/ViewModels/Histories.cs

@@ -448,7 +448,9 @@ namespace SourceGit.ViewModels
             checkout.Click += (o, e) =>
             {
                 if (PopupHost.CanCreatePopup())
-                    PopupHost.ShowAndStartPopup(new Checkout(_repo, branch.Name));
+                {
+                    Checkout.ShowPopup(_repo, branch.Name);
+                }
                 e.Handled = true;
             };
             submenu.Items.Add(checkout);
@@ -527,7 +529,7 @@ namespace SourceGit.ViewModels
                         if (b.IsCurrent)
                             return;
                         if (PopupHost.CanCreatePopup())
-                            PopupHost.ShowAndStartPopup(new Checkout(_repo, b.Name));
+                            Checkout.ShowPopup(_repo, b.Name);
                         return;
                     }
                 }

src/ViewModels/Repository.cs

@@ -843,7 +843,10 @@ namespace SourceGit.ViewModels
                 checkout.Click += (o, e) =>
                 {
                     if (PopupHost.CanCreatePopup())
-                        PopupHost.ShowAndStartPopup(new Checkout(this, branch.Name));
+                    {
+                        Checkout.ShowPopup(this, branch.Name);
+                    }
+                    
                     e.Handled = true;
                 };
                 menu.Items.Add(checkout);

src/Views/Checkout.axaml

@@ -15,5 +15,17 @@
       <Path Width="14" Height="14" Margin="8,0" Data="{StaticResource Icons.Branch}"/>
       <TextBlock Text="{Binding Branch}"/>
     </StackPanel>
+    <StackPanel Orientation="Vertical" IsVisible="{Binding HasLocalChanges}">
+      <TextBlock Text="{DynamicResource Text.Checkout.LocalChanges}"/>
+      <RadioButton Content="{DynamicResource Text.Checkout.LocalChanges.StashAndReply}"
+                   GroupName="LocalChanges"
+                   IsChecked="{Binding StashLocalChanges, Mode=TwoWay }"/>
+      <RadioButton Content="{DynamicResource Text.Checkout.LocalChanges.Discard}"
+                   GroupName="LocalChanges"
+                   IsChecked="{Binding DiscardLocalChanges, Mode=TwoWay}"/>
+      <RadioButton Content="{DynamicResource Text.Checkout.LocalChanges.Leave}"
+                   GroupName="LocalChanges"
+                   IsChecked="{Binding LeaveLocalChanges, Mode=TwoWay}"/>
+    </StackPanel>
   </StackPanel>
 </UserControl>

src/Views/Repository.axaml.cs

@@ -298,7 +298,7 @@ namespace SourceGit.Views
                     if (branch.IsCurrent)
                         return;
 
-                    ViewModels.PopupHost.ShowAndStartPopup(new ViewModels.Checkout(repo, branch.Name));
+                    ViewModels.Checkout.ShowPopup(repo, branch.Name);
                     e.Handled = true;
                 }
             }