feature: add tooltip for SHA in commit message presenter (#734)

Signed-off-by: leo <longshuang@msn.cn>

src/Models/OpenAI.cs

@@ -175,7 +175,7 @@ namespace SourceGit.Models
                 var body = reader.Result;
                 if (!rsp.IsSuccessStatusCode)
                 {
-                    throw new Exception($"AI service returns error code {rsp.StatusCode}. Body: {body??string.Empty}");
+                    throw new Exception($"AI service returns error code {rsp.StatusCode}. Body: {body ?? string.Empty}");
                 }
 
                 return JsonSerializer.Deserialize(reader.Result, JsonCodeGen.Default.OpenAIChatResponse);

src/Views/CommitBaseInfo.axaml

@@ -211,6 +211,20 @@
                 <Setter Property="MaxWidth" Value="800"/>
               </Style>
             </v:CommitMessagePresenter.Styles>
+            
+            <v:CommitMessagePresenter.DataTemplates>
+              <DataTemplate DataType="m:Commit">
+                <StackPanel MinWidth="400" Orientation="Vertical">
+                  <Grid ColumnDefinitions="Auto,*,Auto">
+                    <v:Avatar Grid.Column="0" Width="16" Height="16" VerticalAlignment="Center" IsHitTestVisible="False" User="{Binding Author}"/>
+                    <TextBlock Grid.Column="1" Classes="primary" Text="{Binding Author.Name}" Margin="8,0,0,0"/>
+                    <TextBlock Grid.Column="2" Classes="primary" Text="{Binding CommitterTimeStr}" Foreground="{DynamicResource Brush.FG2}" Margin="8,0,0,0"/>
+                  </Grid>
+
+                  <TextBlock Classes="primary" Margin="0,8,0,0" Text="{Binding Subject}" TextWrapping="Wrap"/>
+                </StackPanel>
+              </DataTemplate>
+            </v:CommitMessagePresenter.DataTemplates>
           </v:CommitMessagePresenter>
         </Grid>
       </StackPanel>

src/Views/CommitMessagePresenter.cs

@@ -1,12 +1,14 @@
 using System;
 using System.Collections.Generic;
 using System.Text.RegularExpressions;
+using System.Threading.Tasks;
 
 using Avalonia;
 using Avalonia.Collections;
 using Avalonia.Controls;
 using Avalonia.Controls.Documents;
 using Avalonia.Input;
+using Avalonia.Threading;
 using Avalonia.VisualTree;
 
 namespace SourceGit.Views
@@ -43,7 +45,9 @@ namespace SourceGit.Views
             if (change.Property == MessageProperty || change.Property == IssueTrackerRulesProperty)
             {
                 Inlines!.Clear();
+                _inlineCommits.Clear();
                 _matches = null;
+                _lastHover = null;
                 ClearHoveredIssueLink();
 
                 var message = Message;
@@ -154,6 +158,10 @@ namespace SourceGit.Views
                         ToolTip.SetTip(this, match.Link);
                         ToolTip.SetIsOpen(this, true);
                     }
+                    else
+                    {
+                        ProcessHoverCommitLink(match);
+                    }
 
                     return;
                 }
@@ -256,6 +264,52 @@ namespace SourceGit.Views
             ClearHoveredIssueLink();
         }
 
+        private void ProcessHoverCommitLink(Models.Hyperlink link)
+        {
+            var sha = link.Link;
+
+            // If we have already queried this SHA, just use it.
+            if (_inlineCommits.TryGetValue(sha, out var exist))
+            {
+                if (exist != null)
+                {
+                    ToolTip.SetTip(this, exist);
+                    ToolTip.SetIsOpen(this, true);
+                }
+
+                return;
+            }
+
+            var parentView = this.FindAncestorOfType<CommitBaseInfo>();
+            if (parentView is { DataContext: ViewModels.CommitDetail detail })
+            {
+                // Record the SHA of current viewing commit in the CommitDetail panel to determine if it is changed after
+                // asynchronous queries.
+                var lastDetailCommit = detail.Commit.SHA;
+                Task.Run(() =>
+                {
+                    var c = detail.GetParent(sha);
+                    Dispatcher.UIThread.Invoke(() =>
+                    {
+                        // Make sure the DataContext of CommitBaseInfo is not changed.
+                        var currentParent = this.FindAncestorOfType<CommitBaseInfo>();
+                        if (currentParent is { DataContext: ViewModels.CommitDetail currentDetail } &&
+                            currentDetail.Commit.SHA == lastDetailCommit)
+                        {
+                            _inlineCommits.Add(sha, c);
+
+                            // Make sure user still hovers the target SHA.
+                            if (_lastHover == link)
+                            {
+                                ToolTip.SetTip(this, c);
+                                ToolTip.SetIsOpen(this, true);
+                            }
+                        }
+                    });
+                });
+            }
+        }
+
         private void ClearHoveredIssueLink()
         {
             if (_lastHover != null)
@@ -268,5 +322,6 @@ namespace SourceGit.Views
 
         private List<Models.Hyperlink> _matches = null;
         private Models.Hyperlink _lastHover = null;
+        private Dictionary<string, Models.Commit> _inlineCommits = new();
     }
 }