From dab5302fc8073d6cd0b339670bf73220cacb454b Mon Sep 17 00:00:00 2001
From: leo <longshuang@msn.cn>
Date: Wed, 18 Nov 2020 17:14:32 +0800
Subject: [PATCH] feature<CommitViewer>: support avatar from gravatar.com

---
 src/UI/CommitViewer.xaml    | 414 ++++++++++++++++++++----------------
 src/UI/CommitViewer.xaml.cs |  45 +++-
 2 files changed, 269 insertions(+), 190 deletions(-)

diff --git a/src/UI/CommitViewer.xaml b/src/UI/CommitViewer.xaml
index 715c44fd..7af18a61 100644
--- a/src/UI/CommitViewer.xaml
+++ b/src/UI/CommitViewer.xaml
@@ -18,201 +18,243 @@
                     <RowDefinition Height="Auto"/>
                     <RowDefinition Height="Auto"/>
                     <RowDefinition Height="Auto"/>
-                    <RowDefinition x:Name="committerRow" Height="Auto"/>
-                    <RowDefinition Height="16"/>
                     <RowDefinition Height="Auto"/>
-                    <RowDefinition Height="Auto"/>
-                    <RowDefinition Height="16"/>
                     <RowDefinition Height="*"/>
-                    <RowDefinition Height="Auto"/>
                 </Grid.RowDefinitions>
+                
+                <!-- Base information -->
+                <Grid Grid.Row="0">
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="*"/>
+                        <ColumnDefinition Width="72"/>
+                    </Grid.ColumnDefinitions>
 
-                <Grid.ColumnDefinitions>
-                    <ColumnDefinition Width="96"/>
-                    <ColumnDefinition Width="*"/>
-                    <ColumnDefinition Width="96"/>
-                    <ColumnDefinition Width="*"/>
-                </Grid.ColumnDefinitions>
+                    <Grid Grid.Column="0">
+                        <Grid.RowDefinitions>
+                            <RowDefinition Height="Auto"/>
+                            <RowDefinition x:Name="refRow" Height="Auto"/>
+                            <RowDefinition Height="Auto"/>
+                            <RowDefinition x:Name="committerRow" Height="Auto"/>
+                        </Grid.RowDefinitions>
 
-                <!-- SHA -->
-                <Label Grid.Row="0" Grid.Column="0" Content="SHA" HorizontalAlignment="Right" Opacity=".6"/>
-                <TextBox Grid.Row="0" Grid.Column="1" 
-                     x:Name="SHA" 
-                     IsReadOnly="True" 
-                     Background="Transparent" 
-                     BorderThickness="0"
-                     Margin="11,0,0,0"/>
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="96"/>
+                            <ColumnDefinition Width="*"/>
+                            <ColumnDefinition Width="96"/>
+                            <ColumnDefinition Width="*"/>
+                        </Grid.ColumnDefinitions>
 
-                <!-- Refs -->
-                <Label x:Name="lblRefs" Grid.Row="0" Grid.Column="2" Content="REFS" HorizontalAlignment="Right" Opacity=".6"/>
-                <ItemsControl Grid.Row="0" Grid.Column="3" x:Name="refs" Margin="8,0,0,0">
-                    <ItemsControl.ItemsPanel>
-                        <ItemsPanelTemplate>
-                            <VirtualizingStackPanel Orientation="Horizontal" VerticalAlignment="Center"/>
-                        </ItemsPanelTemplate>
-                    </ItemsControl.ItemsPanel>
+                        <!-- SHA -->
+                        <Label Grid.Row="0" Grid.Column="0" Content="SHA" HorizontalAlignment="Right" Opacity=".6"/>
+                        <TextBox 
+                            Grid.Row="0" Grid.Column="1" 
+                            x:Name="SHA" 
+                            IsReadOnly="True" 
+                            Background="Transparent" 
+                            BorderThickness="0"
+                            Margin="11,0,0,0"/>
 
-                    <ItemsControl.ItemTemplate>
-                        <DataTemplate>
-                            <Border x:Name="BG" Height="16" Margin="2">
-                                <Grid>
-                                    <Grid.ColumnDefinitions>
-                                        <ColumnDefinition Width="18"/>
-                                        <ColumnDefinition Width="Auto"/>
-                                    </Grid.ColumnDefinitions>
+                        <!-- PARENTS -->
+                        <Label Grid.Row="0" Grid.Column="2" Content="PARENTS" HorizontalAlignment="Right" Opacity=".6"/>
+                        <ItemsControl Grid.Row="0" Grid.Column="3" x:Name="parents" Margin="8,0,0,0">
+                            <ItemsControl.ItemsPanel>
+                                <ItemsPanelTemplate>
+                                    <VirtualizingStackPanel Orientation="Horizontal" VerticalAlignment="Center"/>
+                                </ItemsPanelTemplate>
+                            </ItemsControl.ItemsPanel>
 
-                                    <Border Grid.Column="0" Background="{StaticResource Brush.BG5}">
-                                        <Path x:Name="Icon" Width="8" Style="{StaticResource Style.Icon}" Data="{StaticResource Icon.Branch}"/>
-                                    </Border>
-
-                                    <Label x:Name="Name" Grid.Column="1" Content="{Binding Name}" FontSize="11" Padding="4,0" Foreground="Black"/>
-                                </Grid>
-                            </Border>
-
-                            <DataTemplate.Triggers>
-                                <DataTrigger Binding="{Binding Type}" Value="{x:Static git:DecoratorType.Tag}">
-                                    <Setter TargetName="BG" Property="Background" Value="#FF02C302"/>
-                                    <Setter TargetName="Icon" Property="Data" Value="{StaticResource Icon.Tag}"/>
-                                </DataTrigger>
-                                <DataTrigger Binding="{Binding Type}" Value="{x:Static git:DecoratorType.LocalBranchHead}">
-                                    <Setter TargetName="BG" Property="Background" Value="#FFFFB835"/>
-                                    <Setter TargetName="Icon" Property="Data" Value="{StaticResource Icon.Branch}"/>
-                                </DataTrigger>
-                                <DataTrigger Binding="{Binding Type}" Value="{x:Static git:DecoratorType.RemoteBranchHead}">
-                                    <Setter TargetName="BG" Property="Background" Value="#FFFFB835"/>
-                                    <Setter TargetName="Icon" Property="Data" Value="{StaticResource Icon.Remote}"/>
-                                </DataTrigger>
-                                <DataTrigger Binding="{Binding Type}" Value="{x:Static git:DecoratorType.CurrentBranchHead}">
-                                    <Setter TargetName="BG" Property="Background" Value="#FFFFB835"/>
-                                    <Setter TargetName="Icon" Property="Data" Value="{StaticResource Icon.Check}"/>
-                                    <Setter TargetName="Icon" Property="Fill" Value="Orange"/>
-                                </DataTrigger>
-                            </DataTemplate.Triggers>
-                        </DataTemplate>
-                    </ItemsControl.ItemTemplate>
-                </ItemsControl>
-
-                <!-- PARENTS -->
-                <Label Grid.Row="1" Grid.Column="0" Content="PARENTS" HorizontalAlignment="Right" Opacity=".6"/>
-                <ItemsControl Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="3" x:Name="parents" Margin="8,0,0,0">
-                    <ItemsControl.ItemsPanel>
-                        <ItemsPanelTemplate>
-                            <VirtualizingStackPanel Orientation="Horizontal" VerticalAlignment="Center"/>
-                        </ItemsPanelTemplate>
-                    </ItemsControl.ItemsPanel>
-
-                    <ItemsControl.ItemTemplate>
-                        <DataTemplate>
-                            <Label Margin="0,0,8,0">
-                                <Hyperlink 
-                                     RequestNavigate="NavigateParent" 
-                                     NavigateUri="{Binding .}"
-                                     ToolTip="NAVIGATE TO COMMIT">
-                                    <Run Text="{Binding .}"/>
-                                </Hyperlink>
-                            </Label>
-                        </DataTemplate>
-                    </ItemsControl.ItemTemplate>
-                </ItemsControl>
-
-                <!-- AUTHOR -->
-                <Label Grid.Row="2" Grid.Column="0" Content="AUTHOR" HorizontalAlignment="Right" Opacity=".6"/>
-                <TextBox Grid.Row="2" Grid.Column="1" x:Name="author"
-                     IsReadOnly="True" 
-                     Background="Transparent"
-                     AcceptsReturn="True"
-                     BorderThickness="0"
-                     Margin="11,0,0,0"/>
-
-                <!-- AUTHOR TIME -->
-                <Label Grid.Row="2" Grid.Column="2" Content="AUTHOR TIME" HorizontalAlignment="Right" Opacity=".6"/>
-                <TextBox Grid.Row="2" Grid.Column="3" Grid.ColumnSpan="3" x:Name="authorTime"
-                     IsReadOnly="True" 
-                     Background="Transparent"
-                     AcceptsReturn="True"
-                     BorderThickness="0"
-                     Margin="8,0,0,0"/>
-
-                <!-- COMMITTER -->
-                <Label Grid.Row="3" Grid.Column="0" Content="COMMITTER" HorizontalAlignment="Right" Opacity=".6"/>
-                <TextBox Grid.Row="3" Grid.Column="1" x:Name="committer"
-                     IsReadOnly="True" 
-                     Background="Transparent"
-                     AcceptsReturn="True"
-                     BorderThickness="0"
-                     Margin="11,0,0,0"/>
-
-                <!-- COMMIT TIME -->
-                <Label Grid.Row="3" Grid.Column="2" Content="COMMIT TIME" HorizontalAlignment="Right" Opacity=".6"/>
-                <TextBox Grid.Row="3" Grid.Column="3" Grid.ColumnSpan="3" x:Name="committerTime"
-                     IsReadOnly="True" 
-                     Background="Transparent"
-                     AcceptsReturn="True"
-                     BorderThickness="0"
-                     Margin="8,0,0,0"/>
-
-                <Rectangle Grid.Row="4" Grid.ColumnSpan="4" Height="1" Margin="8,0" Fill="{StaticResource Brush.Border2}"/>
-
-                <!-- SUBJECT -->
-                <Label Grid.Row="5" Grid.Column="0" Content="SUBJECT" HorizontalAlignment="Right" Opacity=".6"/>
-                <TextBox Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="3" 
-                         x:Name="subject"
-                         IsReadOnly="True"
-                         Background="Transparent"
-                         BorderThickness="0"
-                         Margin="8,0,16,0"/>
-
-                <!-- MESSAGE -->
-                <Label Grid.Row="6" Grid.Column="0" Content="DESCRIPTION" HorizontalAlignment="Right" VerticalAlignment="Top" Opacity=".6"/>
-                <TextBox Grid.Row="6" Grid.Column="1" Grid.ColumnSpan="3" 
-                     x:Name="message"
-                     IsReadOnly="True"
-                     Background="Transparent"
-                     BorderThickness="0"
-                     VerticalAlignment="Center"
-                     FontSize="11"
-                     Margin="11,8,0,0"/>
-
-                <Rectangle Grid.Row="7" Grid.ColumnSpan="4" Height="1" Margin="8,0" Fill="{StaticResource Brush.Border2}"/>
-
-                <!-- CHANGELIST -->
-                <Label Grid.Row="8" Grid.Column="0" Content="CHANGED" HorizontalAlignment="Right" VerticalAlignment="Top" Opacity=".6"/>
-                <DataGrid
-                    Grid.Row="8"
-                    Grid.Column="1"
-                    Grid.ColumnSpan="3"
-                    x:Name="changeList1"
-                    RowHeight="20"
-                    Margin="11,2,0,2">
-                    <DataGrid.Resources>
-                        <converters:FileStatusToColor x:Key="StatusColorConverter"/>
-                        <converters:FileStatusToIcon x:Key="StatusIconConverter"/>
-
-                        <Style x:Key="Style.DataGridText.VerticalCenter" TargetType="{x:Type TextBlock}">
-                            <Setter Property="VerticalAlignment" Value="Center"/>
-                        </Style>
-                    </DataGrid.Resources>
-
-                    <DataGrid.Columns>
-                        <DataGridTemplateColumn Width="22">
-                            <DataGridTemplateColumn.CellTemplate>
+                            <ItemsControl.ItemTemplate>
                                 <DataTemplate>
-                                    <Border Width="14" Height="14" x:Name="status" Background="{Binding ., Converter={StaticResource StatusColorConverter}}" CornerRadius="2" Margin="2,0,4,0">
-                                        <TextBlock Text="{Binding ., Converter={StaticResource StatusIconConverter}}" Foreground="{StaticResource Brush.FG}" TextAlignment="Center" VerticalAlignment="Center" FontSize="8"/>
-                                    </Border>
+                                    <Label Margin="0,0,8,0">
+                                        <Hyperlink RequestNavigate="NavigateParent" NavigateUri="{Binding .}" ToolTip="NAVIGATE TO COMMIT">
+                                            <Run Text="{Binding .}"/>
+                                        </Hyperlink>
+                                    </Label>
                                 </DataTemplate>
-                            </DataGridTemplateColumn.CellTemplate>
-                        </DataGridTemplateColumn>
-                        <DataGridTextColumn Width="*" Binding="{Binding Path}" Foreground="{StaticResource Brush.FG}" FontFamily="Consolas" ElementStyle="{StaticResource Style.DataGridText.VerticalCenter}"/>
-                    </DataGrid.Columns>
+                            </ItemsControl.ItemTemplate>
+                        </ItemsControl>
 
-                    <DataGrid.RowStyle>
-                        <Style TargetType="{x:Type DataGridRow}" BasedOn="{StaticResource Style.DataGridRow}">
-                            <EventSetter Event="ContextMenuOpening" Handler="ChangeListContextMenuOpening"/>
-                            <EventSetter Event="MouseDoubleClick" Handler="ChangeListMouseDoubleClick"/>
-                        </Style>
-                    </DataGrid.RowStyle>
-                </DataGrid>
+                        <!-- Refs -->
+                        <Label Grid.Row="1" Grid.Column="0" Content="REFS" HorizontalAlignment="Right" Opacity=".6"/>
+                        <ItemsControl Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="3" x:Name="refs" Margin="8,0,0,0">
+                            <ItemsControl.ItemsPanel>
+                                <ItemsPanelTemplate>
+                                    <VirtualizingStackPanel Orientation="Horizontal" VerticalAlignment="Center"/>
+                                </ItemsPanelTemplate>
+                            </ItemsControl.ItemsPanel>
+
+                            <ItemsControl.ItemTemplate>
+                                <DataTemplate>
+                                    <Border x:Name="BG" Height="16" Margin="2">
+                                        <Grid>
+                                            <Grid.ColumnDefinitions>
+                                                <ColumnDefinition Width="18"/>
+                                                <ColumnDefinition Width="Auto"/>
+                                            </Grid.ColumnDefinitions>
+
+                                            <Border Grid.Column="0" Background="{StaticResource Brush.BG5}">
+                                                <Path x:Name="Icon" Width="8" Style="{StaticResource Style.Icon}" Data="{StaticResource Icon.Branch}"/>
+                                            </Border>
+
+                                            <Label x:Name="Name" Grid.Column="1" Content="{Binding Name}" FontSize="11" Padding="4,0" Foreground="Black"/>
+                                        </Grid>
+                                    </Border>
+
+                                    <DataTemplate.Triggers>
+                                        <DataTrigger Binding="{Binding Type}" Value="{x:Static git:DecoratorType.Tag}">
+                                            <Setter TargetName="BG" Property="Background" Value="#FF02C302"/>
+                                            <Setter TargetName="Icon" Property="Data" Value="{StaticResource Icon.Tag}"/>
+                                        </DataTrigger>
+                                        <DataTrigger Binding="{Binding Type}" Value="{x:Static git:DecoratorType.LocalBranchHead}">
+                                            <Setter TargetName="BG" Property="Background" Value="#FFFFB835"/>
+                                            <Setter TargetName="Icon" Property="Data" Value="{StaticResource Icon.Branch}"/>
+                                        </DataTrigger>
+                                        <DataTrigger Binding="{Binding Type}" Value="{x:Static git:DecoratorType.RemoteBranchHead}">
+                                            <Setter TargetName="BG" Property="Background" Value="#FFFFB835"/>
+                                            <Setter TargetName="Icon" Property="Data" Value="{StaticResource Icon.Remote}"/>
+                                        </DataTrigger>
+                                        <DataTrigger Binding="{Binding Type}" Value="{x:Static git:DecoratorType.CurrentBranchHead}">
+                                            <Setter TargetName="BG" Property="Background" Value="#FFFFB835"/>
+                                            <Setter TargetName="Icon" Property="Data" Value="{StaticResource Icon.Check}"/>
+                                            <Setter TargetName="Icon" Property="Fill" Value="Orange"/>
+                                        </DataTrigger>
+                                    </DataTemplate.Triggers>
+                                </DataTemplate>
+                            </ItemsControl.ItemTemplate>
+                        </ItemsControl>
+
+                        <!-- AUTHOR -->
+                        <Label Grid.Row="2" Grid.Column="0" Content="AUTHOR" HorizontalAlignment="Right" Opacity=".6"/>
+                        <TextBox
+                            x:Name="author"
+                            Grid.Row="2" Grid.Column="1"
+                            IsReadOnly="True" 
+                            Background="Transparent"
+                            AcceptsReturn="True"
+                            BorderThickness="0"
+                            Margin="11,0,0,0"/>
+
+                        <!-- AUTHOR TIME -->
+                        <Label Grid.Row="2" Grid.Column="2" Content="AUTHOR TIME" HorizontalAlignment="Right" Opacity=".6"/>
+                        <TextBox 
+                            Grid.Row="2" Grid.Column="3"
+                            x:Name="authorTime"
+                            IsReadOnly="True" 
+                            Background="Transparent"
+                            AcceptsReturn="True"
+                            BorderThickness="0"
+                            Margin="8,0,0,0"/>
+
+                        <!-- COMMITTER -->
+                        <Label Grid.Row="3" Grid.Column="0" Content="COMMIT" HorizontalAlignment="Right" Opacity=".6"/>
+                        <TextBox 
+                            Grid.Row="3" Grid.Column="1"
+                            x:Name="committer"
+                            IsReadOnly="True" 
+                            Background="Transparent"
+                            AcceptsReturn="True"
+                            BorderThickness="0"
+                            Margin="11,0,0,0"/>
+
+                        <!-- COMMIT TIME -->
+                        <Label Grid.Row="3" Grid.Column="2" Content="COMMIT TIME" HorizontalAlignment="Right" Opacity=".6"/>
+                        <TextBox 
+                            Grid.Row="3" Grid.Column="3"
+                            x:Name="committerTime"
+                            IsReadOnly="True" 
+                            Background="Transparent"
+                            AcceptsReturn="True"
+                            BorderThickness="0"
+                            Margin="8,0,0,0"/>
+                    </Grid>
+
+                    <Border Grid.Column="1" Padding="8,8,8,0">
+                        <Image x:Name="avatar" VerticalAlignment="Top"/>
+                    </Border>
+                </Grid>
+
+                <Rectangle Grid.Row="1" Height="1" Margin="8" Fill="{StaticResource Brush.Border2}"/>
+                
+                <!-- Commit message -->
+                <Grid Grid.Row="2">
+                    <Grid.RowDefinitions>
+                        <RowDefinition Height="Auto"/>
+                        <RowDefinition Height="Auto"/>
+                    </Grid.RowDefinitions>
+
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="96"/>
+                        <ColumnDefinition Width="*"/>
+                    </Grid.ColumnDefinitions>
+
+                    <!-- SUBJECT -->
+                    <Label Grid.Row="0" Grid.Column="0" Content="SUBJECT" HorizontalAlignment="Right" Opacity=".6"/>
+                    <TextBox 
+                        Grid.Row="0" Grid.Column="1"
+                        x:Name="subject"
+                        IsReadOnly="True"
+                        Background="Transparent"
+                        BorderThickness="0"
+                        Margin="8,0,16,0"/>
+
+                    <!-- MESSAGE -->
+                    <Label Grid.Row="1" Grid.Column="0" Content="DESCRIPTION" HorizontalAlignment="Right" VerticalAlignment="Top" Opacity=".6"/>
+                    <TextBox 
+                        Grid.Row="1" Grid.Column="1"
+                        x:Name="message"
+                        IsReadOnly="True"
+                        Background="Transparent"
+                        BorderThickness="0"
+                        VerticalAlignment="Center"
+                        FontSize="11"
+                        Margin="11,8,0,0"/>
+                </Grid>
+
+                <Rectangle Grid.Row="3" Grid.ColumnSpan="2" Height="1" Margin="8" Fill="{StaticResource Brush.Border2}"/>
+
+                <!-- Changes -->
+                <Grid Grid.Row="4">
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="96"/>
+                        <ColumnDefinition Width="*"/>
+                    </Grid.ColumnDefinitions>
+                    
+                    <Label Grid.Column="0" Content="CHANGED" HorizontalAlignment="Right" VerticalAlignment="Top" Opacity=".6"/>
+                    <DataGrid
+                        Grid.Column="1"
+                        x:Name="changeList1"
+                        RowHeight="20"
+                        Margin="11,2,0,2">
+                        <DataGrid.Resources>
+                            <converters:FileStatusToColor x:Key="StatusColorConverter"/>
+                            <converters:FileStatusToIcon x:Key="StatusIconConverter"/>
+
+                            <Style x:Key="Style.DataGridText.VerticalCenter" TargetType="{x:Type TextBlock}">
+                                <Setter Property="VerticalAlignment" Value="Center"/>
+                            </Style>
+                        </DataGrid.Resources>
+
+                        <DataGrid.Columns>
+                            <DataGridTemplateColumn Width="22">
+                                <DataGridTemplateColumn.CellTemplate>
+                                    <DataTemplate>
+                                        <Border Width="14" Height="14" x:Name="status" Background="{Binding ., Converter={StaticResource StatusColorConverter}}" CornerRadius="2" Margin="2,0,4,0">
+                                            <TextBlock Text="{Binding ., Converter={StaticResource StatusIconConverter}}" Foreground="{StaticResource Brush.FG}" TextAlignment="Center" VerticalAlignment="Center" FontSize="8"/>
+                                        </Border>
+                                    </DataTemplate>
+                                </DataGridTemplateColumn.CellTemplate>
+                            </DataGridTemplateColumn>
+                            <DataGridTextColumn Width="*" Binding="{Binding Path}" Foreground="{StaticResource Brush.FG}" FontFamily="Consolas" ElementStyle="{StaticResource Style.DataGridText.VerticalCenter}"/>
+                        </DataGrid.Columns>
+
+                        <DataGrid.RowStyle>
+                            <Style TargetType="{x:Type DataGridRow}" BasedOn="{StaticResource Style.DataGridRow}">
+                                <EventSetter Event="ContextMenuOpening" Handler="ChangeListContextMenuOpening"/>
+                                <EventSetter Event="MouseDoubleClick" Handler="ChangeListMouseDoubleClick"/>
+                            </Style>
+                        </DataGrid.RowStyle>
+                    </DataGrid>
+                </Grid>
             </Grid>
         </TabItem>
 
@@ -338,7 +380,7 @@
                         </DataGrid.RowStyle>
                     </DataGrid>
                 </Grid>
-                
+
                 <GridSplitter Grid.Column="1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="Transparent"/>
 
                 <local:DiffViewer Grid.Column="2" x:Name="diffViewer" Background="{StaticResource Brush.BG3}"/>
@@ -413,7 +455,7 @@
                             <Label Margin="0,16,0,0" Content="BINARY FILE DETECTED" FontFamily="Consolas" FontSize="18" FontWeight="UltraBold" HorizontalAlignment="Center" Foreground="{StaticResource Brush.FG2}"/>
                         </StackPanel>
                     </Grid>
-                </Border>               
+                </Border>
             </Grid>
         </TabItem>
     </TabControl>
diff --git a/src/UI/CommitViewer.xaml.cs b/src/UI/CommitViewer.xaml.cs
index 42783b4e..1625d810 100644
--- a/src/UI/CommitViewer.xaml.cs
+++ b/src/UI/CommitViewer.xaml.cs
@@ -1,11 +1,15 @@
+using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
+using System.Security.Cryptography;
+using System.Text;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Input;
 using System.Windows.Media;
+using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 
 namespace SourceGit.UI {
@@ -14,6 +18,11 @@ namespace SourceGit.UI {
     ///     Commit detail viewer
     /// </summary>
     public partial class CommitViewer : UserControl {
+        private static readonly string AVATAR_PATH = Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
+            "SourceGit",
+            "avatars");
+
         private Git.Repository repo = null;
         private Git.Commit commit = null;
         private List<Git.Change> cachedChanges = new List<Git.Change>();
@@ -87,13 +96,41 @@ namespace SourceGit.UI {
             subject.Text = commit.Subject;
             message.Text = commit.Message.Trim();
 
-            if (commit.Decorators.Count == 0) lblRefs.Visibility = Visibility.Collapsed;
-            else lblRefs.Visibility = Visibility.Visible;
+            byte[] hash = MD5.Create().ComputeHash(Encoding.Default.GetBytes(commit.Author.Email.ToLower().Trim()));
+            string md5 = "";
+            for (int i = 0; i < hash.Length; i++) md5 += hash[i].ToString("x2");
+            md5 = md5.ToLower();
 
-            if (commit.Committer.Email == commit.Author.Email && commit.Committer.Time == commit.Author.Time) {
-                committerRow.Height = new GridLength(0);
+            if (!Directory.Exists(AVATAR_PATH)) Directory.CreateDirectory(AVATAR_PATH);
+
+            string filePath = Path.Combine(AVATAR_PATH, md5);
+            if (File.Exists(filePath)) {
+                avatar.Source = new BitmapImage(new Uri(filePath));
             } else {
+                var bitmap = new BitmapImage(new Uri("https://www.gravatar.com/avatar/" + md5 + "?d=identicon"));
+                bitmap.DownloadCompleted += (o, e) => {
+                    var owner = o as BitmapImage;
+                    if (owner != null) {
+                        var encoder = new PngBitmapEncoder();
+                        encoder.Frames.Add(BitmapFrame.Create(owner));
+                        using (var fs = new FileStream(filePath, FileMode.Create)) {
+                            encoder.Save(fs);
+                        }
+                    }
+                };
+                avatar.Source = bitmap;
+            }
+
+            if (commit.Decorators.Count == 0) {
+                refRow.Height = new GridLength(0);
                 committerRow.Height = GridLength.Auto;
+            } else {
+                refRow.Height = GridLength.Auto;
+                if (commit.Committer.Email == commit.Author.Email && commit.Committer.Time == commit.Author.Time) {
+                    committerRow.Height = new GridLength(0);
+                } else {
+                    committerRow.Height = GridLength.Auto;
+                }
             }
         }