UI - Added changes since last build to update dialog

src/Artemis.UI/Screens/Settings/Dialogs/UpdateDialogView.xaml

@@ -7,18 +7,39 @@
              mc:Ignorable="d"
              d:DesignHeight="450" d:DesignWidth="800">
     <StackPanel Margin="16">
-        <TextBlock Style="{StaticResource MaterialDesignHeadline6TextBlock}" TextWrapping="Wrap">
+        <TextBlock Style="{StaticResource MaterialDesignHeadline6TextBlock}" TextWrapping="Wrap" Margin="0 0 0 20">
             Update available
         </TextBlock>
         <TextBlock Style="{StaticResource MaterialDesignSubtitle1TextBlock}"
                    Foreground="{DynamicResource MaterialDesignBodyLight}"
-                   Margin="0 20 0 20"
                    TextWrapping="Wrap">
             A new Artemis update is available! 🥳<LineBreak/>
             You are currently running build <Run Text="{Binding CurrentBuild, Mode=OneWay}" /> while the latest build is <Run Text="{Binding LatestBuild, Mode=OneWay}" />. <LineBreak/> <LineBreak/>
             Updating Artemis will give you the latest bug(fixes), features and improvements.
         </TextBlock>
 
+        <TextBlock Style="{StaticResource MaterialDesignHeadline6TextBlock}" TextWrapping="Wrap" Margin="0 20">
+            Changes
+        </TextBlock>
+
+        <StackPanel Visibility="{Binding RetrievingChanges, Converter={x:Static s:BoolToVisibilityConverter.Instance}, Mode=OneWay}">
+            <TextBlock Style="{StaticResource MaterialDesignSubtitle1TextBlock}"
+                       Foreground="{DynamicResource MaterialDesignBodyLight}"
+                       HorizontalAlignment="Center"
+                       Margin="0 10">
+                Retrieving changes...
+            </TextBlock>
+            <ProgressBar IsIndeterminate="True" />
+        </StackPanel>
+
+        <ItemsControl ItemsSource="{Binding Changes}" Visibility="{Binding RetrievingChanges, Converter={x:Static s:BoolToVisibilityConverter.InverseInstance}, Mode=OneWay}">
+            <ItemsControl.ItemTemplate>
+                <DataTemplate>
+                    <TextBlock Text="{Binding}" Style="{StaticResource MaterialDesignSubtitle1TextBlock}" Foreground="{DynamicResource MaterialDesignBodyLight}"></TextBlock>
+                </DataTemplate>
+            </ItemsControl.ItemTemplate>
+        </ItemsControl>
+
         <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Margin="0 8 0 0">
             <Button Style="{StaticResource MaterialDesignFlatButton}"
                     Focusable="False"

src/Artemis.UI/Screens/Settings/Dialogs/UpdateDialogViewModel.cs

@@ -1,31 +1,48 @@
 using System;
+using System.Collections.Generic;
+using System.Linq;
 using System.Threading.Tasks;
 using Artemis.Core;
 using Artemis.UI.Services;
+using Artemis.UI.Services.Models.UpdateService;
 using Artemis.UI.Shared.Services;
 using Newtonsoft.Json.Linq;
+using Stylet;
 
 namespace Artemis.UI.Screens.Settings.Dialogs
 {
     public class UpdateDialogViewModel : DialogViewModelBase
     {
-        private readonly JToken _buildInfo;
+        private readonly DevOpsBuild _buildInfo;
         private readonly IDialogService _dialogService;
+        private readonly IMessageService _messageService;
         private readonly IUpdateService _updateService;
         private bool _canUpdate = true;
+        private bool _retrievingChanges;
 
-        public UpdateDialogViewModel(JToken buildInfo, IUpdateService updateService, IDialogService dialogService)
+        public UpdateDialogViewModel(DevOpsBuild buildInfo, IUpdateService updateService, IDialogService dialogService, IMessageService messageService)
         {
             _buildInfo = buildInfo;
             _updateService = updateService;
             _dialogService = dialogService;
-            
+            _messageService = messageService;
+
             CurrentBuild = Constants.BuildInfo.BuildNumberDisplay;
-            LatestBuild = buildInfo?.SelectToken("value[0].buildNumber")?.Value<string>();
+            LatestBuild = buildInfo.BuildNumber;
+            Changes = new BindableCollection<string>();
+
+            Task.Run(GetBuildChanges);
         }
 
         public string CurrentBuild { get; }
         public string LatestBuild { get; }
+        public BindableCollection<string> Changes { get; }
+
+        public bool RetrievingChanges
+        {
+            get => _retrievingChanges;
+            set => SetAndNotify(ref _retrievingChanges, value);
+        }
 
         public bool CanUpdate
         {
@@ -33,6 +50,41 @@ namespace Artemis.UI.Screens.Settings.Dialogs
             set => SetAndNotify(ref _canUpdate, value);
         }
 
+        private async Task GetBuildChanges()
+        {
+            try
+            {
+                RetrievingChanges = true;
+                Task<DevOpsBuild> currentTask = _updateService.GetBuildInfo(1, CurrentBuild);
+                Task<DevOpsBuild> latestTask = _updateService.GetBuildInfo(1, LatestBuild);
+
+                DevOpsBuild current = await currentTask;
+                DevOpsBuild latest = await latestTask;
+
+                if (current != null && latest != null)
+                {
+                    GitHubDifference difference = await _updateService.GetBuildDifferences(current, latest);
+
+                    // Only take commits with one parents (no merges)
+                    Changes.Clear();
+                    Changes.AddRange(difference.Commits.Where(c => c.Parents.Count == 1)
+                        .SelectMany(c => c.Commit.Message.Split("\n"))
+                        .Select(m => m.Trim())
+                        .Where(m => !string.IsNullOrWhiteSpace(m))
+                        .OrderBy(m => m)
+                    );
+                }
+            }
+            catch (Exception e)
+            {
+                _messageService.ShowMessage($"Failed to retrieve build changes - {e.Message}");
+            }
+            finally
+            {
+                RetrievingChanges = false;
+            }
+        }
+
         public async Task Update()
         {
             try