Fix null commit author

src/GitHub.App/SampleData/Documents/PullRequestPageViewModelDesigner.cs

@@ -59,13 +59,13 @@ Depends on #1993
                 new CommitListViewModel(
                     new CommitSummaryViewModel(new CommitModel
                     {
-                        Author = new ActorModel { Login = "grokys" },
+                        Author = new CommitActorModel { User = new ActorModel{ Login = "grokys" }},
                         AbbreviatedOid = "c7c7d25",
                         MessageHeadline = "Refactor comment view models."
                     }),
                     new CommitSummaryViewModel(new CommitModel
                     {
-                        Author = new ActorModel { Login = "shana" },
+                        Author = new CommitActorModel { User = new ActorModel{ Login = "shana" }},
                         AbbreviatedOid = "04e6a90",
                         MessageHeadline = "Refactor comment view models.",
                     })),

src/GitHub.App/ViewModels/CommitActorViewModel.cs

@@ -0,0 +1,19 @@
+using GitHub.Models;
+
+namespace GitHub.ViewModels
+{
+    public class CommitActorViewModel: ActorViewModel, ICommitActorViewModel
+    {
+        public CommitActorViewModel(CommitActorModel model)
+            :base(model.User)
+        {
+            Name = model.Name;
+            Email = model.Email;
+            HasLogin = model.User != null;
+        }
+
+        public string Email { get; }
+        public string Name { get; }
+        public bool HasLogin { get; }
+    }
+}

src/GitHub.App/ViewModels/Documents/CommitListViewModel.cs

@@ -25,6 +25,7 @@ public CommitListViewModel(params ICommitSummaryViewModel[] commits)
 
             Commits = commits;
             Author = Commits[0].Author;
+            AuthorName = GetAuthorDisplayName(Commits[0].Author);
             AuthorCaption = BuildAuthorCaption();
         }
 
@@ -42,12 +43,16 @@ public CommitListViewModel(IEnumerable<ICommitSummaryViewModel> commits)
             }
 
             Author = Commits[0].Author;
+            AuthorName = GetAuthorDisplayName(Commits[0].Author);
             AuthorCaption = BuildAuthorCaption();
         }
 
         /// <inheritdoc/>
-        public IActorViewModel Author { get; }
+        public ICommitActorViewModel Author { get; }
 
+        /// <inheritdoc/>
+        public string AuthorName { get; }
+
         /// <inheritdoc/>
         public string AuthorCaption { get; }
 
@@ -58,7 +63,7 @@ string BuildAuthorCaption()
         {
             var result = new StringBuilder();
 
-            if (Commits.Any(x => x.Author.Login != Author.Login))
+            if (Commits.Any(x => GetAuthorDisplayName(x.Author) != AuthorName))
             {
                 result.Append(Resources.AndOthers);
                 result.Append(' ');
@@ -67,5 +72,10 @@ string BuildAuthorCaption()
             result.Append(Resources.AddedSomeCommits);
             return result.ToString();
         }
+
+        string GetAuthorDisplayName(ICommitActorViewModel commitActorViewModel)
+        {
+            return commitActorViewModel.HasLogin ? commitActorViewModel.Login : commitActorViewModel.Name;
+        }
     }
 }

src/GitHub.App/ViewModels/Documents/CommitSummaryViewModel.cs

@@ -14,7 +14,7 @@ public class CommitSummaryViewModel : ViewModelBase, ICommitSummaryViewModel
         public CommitSummaryViewModel(CommitModel commit)
         {
             AbbreviatedOid = commit.AbbreviatedOid;
-            Author = new ActorViewModel(commit.Author);
+            Author = new CommitActorViewModel(commit.Author);
             Header = commit.MessageHeadline;
             Oid = commit.Oid;
         }
@@ -23,7 +23,7 @@ public CommitSummaryViewModel(CommitModel commit)
         public string AbbreviatedOid { get; private set; }
 
         /// <inheritdoc/>
-        public IActorViewModel Author { get; private set; }
+        public ICommitActorViewModel Author { get; private set; }
 
         /// <inheritdoc/>
         public string Header { get; private set; }

src/GitHub.Exports.Reactive/ViewModels/Documents/ICommitListViewModel.cs

@@ -11,7 +11,12 @@ public interface ICommitListViewModel : IViewModel
         /// <summary>
         /// Gets the first author of the commits in the list.
         /// </summary>
-        IActorViewModel Author { get; }
+        ICommitActorViewModel Author { get; }
+
+        /// <summary>
+        /// Gets a string to display the author login or the author name.
+        /// </summary>
+        string AuthorName { get; }
 
         /// <summary>
         /// Gets a string to display next to the author in the view.

src/GitHub.Exports.Reactive/ViewModels/Documents/ICommitSummaryViewModel.cs

@@ -13,7 +13,7 @@ public interface ICommitSummaryViewModel : IViewModel
         /// <summary>
         /// Gets the commit author.
         /// </summary>
-        IActorViewModel Author { get; }
+        ICommitActorViewModel Author { get; }
 
         /// <summary>
         /// Gets the commit message header.

src/GitHub.Exports.Reactive/ViewModels/ICommitActorViewModel.cs

@@ -0,0 +1,9 @@
+namespace GitHub.ViewModels
+{
+    public interface ICommitActorViewModel : IActorViewModel
+    {
+        string Email { get; }
+        string Name { get; }
+        bool HasLogin { get; }
+    }
+}

src/GitHub.Exports/Models/CommitActorModel.cs

@@ -0,0 +1,23 @@
+namespace GitHub.Models
+{
+    /// <summary>
+    /// Represents a commit actor (which may or may not have an associated User or Bot).
+    /// </summary>
+    public class CommitActorModel
+    {
+        /// <summary>
+        /// Gets or sets the actor user
+        /// </summary>
+        public ActorModel User { get; set; }
+
+        /// <summary>
+        /// Gets or sets the actor name
+        /// </summary>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// Gets or sets the actor email
+        /// </summary>
+        public string Email { get; set; }
+    }
+}

src/GitHub.Exports/Models/CommitModel.cs

@@ -10,7 +10,7 @@ public class CommitModel
         /// <summary>
         /// Gets or sets the author of the commit.
         /// </summary>
-        public ActorModel Author { get; set; }
+        public CommitActorModel Author { get; set; }
 
         /// <summary>
         /// Gets or sets the abbreviated git object ID for the commit.

src/GitHub.InlineReviews/Services/PullRequestSessionService.cs

@@ -365,11 +365,14 @@ public virtual async Task<PullRequestDetailModel> ReadPullRequestDetail(HostAddr
                             when.Commit(commit => new CommitModel
                             {
                                 AbbreviatedOid = commit.AbbreviatedOid,
-                                // TODO: commit.Author.User can be null
-                                Author = new ActorModel
-                                {
-                                    Login = commit.Author.User.Login,
-                                    AvatarUrl = commit.Author.User.AvatarUrl(null),
+                                Author = new CommitActorModel {
+                                    Name = commit.Author.Name,
+                                    Email = commit.Author.Email,
+                                    User = commit.Author.User != null ? new ActorModel
+                                    {
+                                        Login = commit.Author.User.Login,
+                                        AvatarUrl = commit.Author.User.AvatarUrl(null),
+                                    } : null
                                 },
                                 MessageHeadline = commit.MessageHeadline,
                                 Oid = commit.Oid,

src/GitHub.VisualStudio.UI/Views/Documents/CommitListView.xaml

@@ -49,7 +49,7 @@
                     ViewModel="{Binding Author}"/>
 
                 <TextBlock Foreground="{DynamicResource VsBrush.WindowText}" VerticalAlignment="Center">
-                    <Run FontWeight="SemiBold" Text="{Binding Author.Login, Mode=OneWay}" />
+                    <Run FontWeight="SemiBold" Text="{Binding AuthorName, Mode=OneWay}" />
                     <Run Text="{Binding AuthorCaption, Mode=OneWay}" />
                 </TextBlock>
             </StackPanel>