Adding checkout commit menu and dialog

src/Resources/Locales/en_US.axaml

@@ -53,7 +53,11 @@
   <x:String x:Key="Text.ChangeDisplayMode.List" xml:space="preserve">Show as List</x:String>
   <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.Commit" xml:space="preserve">Checkout Commit</x:String>
+  <x:String x:Key="Text.Checkout.Commit.Warning" xml:space="preserve">Warning: By doing a commit checkout, your Head will be detached</x:String>
   <x:String x:Key="Text.Checkout.Target" xml:space="preserve">Branch :</x:String>
+  <x:String x:Key="Text.Checkout.CommitTarget.Sha" xml:space="preserve">Commit SHA :</x:String>
+  <x:String x:Key="Text.Checkout.CommitTarget.ShortSha" xml:space="preserve">Commit Short SHA :</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>
@@ -73,6 +77,7 @@
   <x:String x:Key="Text.Close" xml:space="preserve">CLOSE</x:String>
   <x:String x:Key="Text.CommitCM.CherryPick" xml:space="preserve">Cherry-Pick This Commit</x:String>
   <x:String x:Key="Text.CommitCM.CopySHA" xml:space="preserve">Copy SHA</x:String>
+  <x:String x:Key="Text.CommitCM.Checkout" xml:space="preserve">Checkout commit${0}</x:String>
   <x:String x:Key="Text.CommitCM.Rebase" xml:space="preserve">Rebase${0}$to Here</x:String>
   <x:String x:Key="Text.CommitCM.Reset" xml:space="preserve">Reset${0}$to Here</x:String>
   <x:String x:Key="Text.CommitCM.Revert" xml:space="preserve">Revert Commit</x:String>

src/SourceGit.csproj

@@ -44,4 +44,11 @@
     <TrimmerRootAssembly Include="SourceGit" />
     <TrimmerRootAssembly Include="Avalonia.Themes.Fluent" />
   </ItemGroup>
+
+  <ItemGroup>
+    <Compile Update="Views\CheckoutCommit.axaml.cs">
+      <DependentUpon>CheckoutCommit.axaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+  </ItemGroup>
 </Project>

src/ViewModels/CheckoutCommit.cs

@@ -0,0 +1,87 @@
+using System.Threading.Tasks;
+
+namespace SourceGit.ViewModels
+{
+    public class CheckoutCommit: Popup
+    {
+        public string Commit
+        {
+            get;
+            private set;
+        }
+        
+        public bool HasLocalChanges
+        {
+            get => _repo.WorkingCopyChangesCount > 0;
+        }
+
+        public bool AutoStash
+        {
+            get => _autoStash;
+            set => SetProperty(ref _autoStash, value);
+        }
+
+        public CheckoutCommit(Repository repo, string commit)
+        {
+            _repo = repo;
+            Commit = commit;
+            View = new Views.CheckoutCommit() { DataContext = this };
+        }
+
+        public override Task<bool> Sure()
+        {
+            _repo.SetWatcherEnabled(false);
+            ProgressDescription = $"Checkout Commit '{Commit}' ...";
+            
+            return Task.Run(() =>
+            {
+                var needPopStash = false;
+                if (HasLocalChanges)
+                {
+                    if (AutoStash)
+                    {
+                        SetProgressDescription("Adding untracked changes ...");
+                        var succ = new Commands.Add(_repo.FullPath).Exec();
+                        if (succ)
+                        {
+                            SetProgressDescription("Stash local changes ...");
+                            succ = new Commands.Stash(_repo.FullPath).Push("CHECKOUT_AUTO_STASH");
+                        }
+
+                        if (!succ)
+                        {
+                            CallUIThread(() => _repo.SetWatcherEnabled(true));
+                            return false;
+                        }
+
+                        needPopStash = true;
+                    }
+                    else
+                    {
+                        SetProgressDescription("Discard local changes ...");
+                        Commands.Discard.All(_repo.FullPath);
+                    }
+                }
+
+                SetProgressDescription("Checkout commit ...");
+                var rs = new Commands.Checkout(_repo.FullPath).Commit(Commit, SetProgressDescription);
+
+                if (needPopStash)
+                {
+                    SetProgressDescription("Re-apply local changes...");
+                    rs = new Commands.Stash(_repo.FullPath).Apply("stash@{0}");
+                    if (rs)
+                    {
+                        rs = new Commands.Stash(_repo.FullPath).Drop("stash@{0}");
+                    }
+                }
+
+                CallUIThread(() => _repo.SetWatcherEnabled(true));
+                return rs;
+            });
+        }
+
+        private readonly Repository _repo = null;
+        private bool _autoStash = true;
+    }
+}

src/ViewModels/Histories.cs

@@ -1,9 +1,11 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Threading.Tasks;
 
 using Avalonia.Controls;
+using Avalonia.Data.Converters;
 using Avalonia.Platform.Storage;
 using Avalonia.Threading;
 
@@ -234,6 +236,20 @@ namespace SourceGit.ViewModels
                     e.Handled = true;
                 };
                 menu.Items.Add(reset);
+
+                var checkoutCommit = new MenuItem();
+
+                var shortSha = Converters.StringConverters.ToShortSHA
+                    .Convert(commit.SHA, typeof(string), null, CultureInfo.CurrentCulture);
+                
+                checkoutCommit.Header = new Views.NameHighlightedTextBlock("CommitCM.Checkout", shortSha);
+                checkoutCommit.Icon = App.CreateMenuIcon("Icons.Check");
+                checkoutCommit.Click += (o, e) =>
+                {
+                    _repo.CheckoutCommit(commit.SHA);
+                    e.Handled = true;
+                };
+                menu.Items.Add(checkoutCommit);
             }
             else
             {

src/ViewModels/Repository.cs

@@ -722,6 +722,14 @@ namespace SourceGit.ViewModels
                 PopupHost.ShowAndStartPopup(new Checkout(this, branch));
         }
 
+        public void CheckoutCommit(string commit)
+        {
+            if (!PopupHost.CanCreatePopup())
+                return;
+            
+            PopupHost.ShowPopup(new CheckoutCommit(this, commit));
+        }
+        
         public void CreateNewTag()
         {
             var current = Branches.Find(x => x.IsCurrent);

src/Views/CheckoutCommit.axaml

@@ -0,0 +1,45 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:vm="using:SourceGit.ViewModels"
+             xmlns:c="clr-namespace:SourceGit.Converters"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="SourceGit.Views.CheckoutCommit"
+             x:DataType="vm:CheckoutCommit">
+  <StackPanel Orientation="Vertical" Margin="8,0">
+    <TextBlock FontSize="18"
+               Classes="bold"
+               Text="{DynamicResource Text.Checkout.Commit}"/>
+    
+      <TextBlock FontSize="14"
+         TextWrapping="Wrap"
+         Classes="italic"
+         Text="{DynamicResource Text.Checkout.Commit.Warning}"/>
+    
+    <TextBlock TextWrapping="Wrap" Margin="0,16,0,0">
+      <TextBlock Classes="bold"  Grid.Row="0" Grid.Column="0"
+           Text="{DynamicResource Text.Checkout.CommitTarget.Sha}"/>
+        <TextBlock TextWrapping="Wrap" Text="{Binding Commit}"/>
+        (<TextBlock Classes="italic" TextWrapping="Wrap" Text="{Binding Commit, Converter={x:Static c:StringConverters.ToShortSHA}}"/>)
+    </TextBlock>
+    
+    <StackPanel Margin="0, 26, 0, 0" Grid.Row="1" Grid.Column="1" Orientation="Vertical" IsVisible="{Binding HasLocalChanges}">
+      <TextBlock Grid.Row="1" Grid.Column="0"
+                 HorizontalAlignment="Left" VerticalAlignment="Center"
+                 Margin="0,0,8,0"
+                 Text="{DynamicResource Text.Checkout.LocalChanges}"/>
+    
+      <StackPanel Margin="0, 13, 0, 0" Grid.Row="1" Grid.Column="1" Orientation="Horizontal">
+        <RadioButton Content="{DynamicResource Text.Checkout.LocalChanges.StashAndReply}"
+                     GroupName="LocalChanges"
+                     IsChecked="{Binding AutoStash, Mode=TwoWay}"/>
+        <RadioButton Content="{DynamicResource Text.Checkout.LocalChanges.Discard}"
+                     GroupName="LocalChanges"
+                     Margin="8,0,0,0"/>
+      </StackPanel>
+    </StackPanel>
+    
+    
+  </StackPanel>
+</UserControl>

src/Views/CheckoutCommit.axaml.cs

@@ -0,0 +1,13 @@
+using Avalonia.Controls;
+
+namespace SourceGit.Views
+{
+    public partial class CheckoutCommit : UserControl
+    {
+        public bool HasLocalChanges;
+        public CheckoutCommit()
+        {
+            InitializeComponent();
+        }
+    }
+}