feature<CommitViewer>: support avatar from gravatar.com

src/UI/CommitViewer.xaml

@@ -18,13 +18,23 @@
                     <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="*"/>
+                </Grid.RowDefinitions>
+                
+                <!-- Base information -->
+                <Grid Grid.Row="0">
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="*"/>
+                        <ColumnDefinition Width="72"/>
+                    </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>
 
                         <Grid.ColumnDefinitions>
@@ -36,16 +46,37 @@
 
                         <!-- SHA -->
                         <Label Grid.Row="0" Grid.Column="0" Content="SHA" HorizontalAlignment="Right" Opacity=".6"/>
-                <TextBox Grid.Row="0" Grid.Column="1" 
+                        <TextBox 
+                            Grid.Row="0" Grid.Column="1" 
                             x:Name="SHA" 
                             IsReadOnly="True" 
                             Background="Transparent" 
                             BorderThickness="0"
                             Margin="11,0,0,0"/>
 
+                        <!-- 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>
+
+                            <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>
+
                         <!-- Refs -->
-                <Label x:Name="lblRefs" Grid.Row="0" Grid.Column="2" Content="REFS" HorizontalAlignment="Right" Opacity=".6"/>
+                        <Label Grid.Row="1" Grid.Column="0" Content="REFS" HorizontalAlignment="Right" Opacity=".6"/>
-                <ItemsControl Grid.Row="0" Grid.Column="3" x:Name="refs" Margin="8,0,0,0">
+                        <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"/>
@@ -92,32 +123,11 @@
                             </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"
+                        <TextBox
+                            x:Name="author"
+                            Grid.Row="2" Grid.Column="1"
                             IsReadOnly="True" 
                             Background="Transparent"
                             AcceptsReturn="True"
@@ -126,7 +136,9 @@
 
                         <!-- 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"
+                        <TextBox 
+                            Grid.Row="2" Grid.Column="3"
+                            x:Name="authorTime"
                             IsReadOnly="True" 
                             Background="Transparent"
                             AcceptsReturn="True"
@@ -134,8 +146,10 @@
                             Margin="8,0,0,0"/>
 
                         <!-- COMMITTER -->
-                <Label Grid.Row="3" Grid.Column="0" Content="COMMITTER" HorizontalAlignment="Right" Opacity=".6"/>
+                        <Label Grid.Row="3" Grid.Column="0" Content="COMMIT" HorizontalAlignment="Right" Opacity=".6"/>
-                <TextBox Grid.Row="3" Grid.Column="1" x:Name="committer"
+                        <TextBox 
+                            Grid.Row="3" Grid.Column="1"
+                            x:Name="committer"
                             IsReadOnly="True" 
                             Background="Transparent"
                             AcceptsReturn="True"
@@ -144,18 +158,39 @@
 
                         <!-- 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"
+                        <TextBox 
+                            Grid.Row="3" Grid.Column="3"
+                            x:Name="committerTime"
                             IsReadOnly="True" 
                             Background="Transparent"
                             AcceptsReturn="True"
                             BorderThickness="0"
                             Margin="8,0,0,0"/>
+                    </Grid>
 
-                <Rectangle Grid.Row="4" Grid.ColumnSpan="4" Height="1" Margin="8,0" Fill="{StaticResource Brush.Border2}"/>
+                    <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="5" Grid.Column="0" Content="SUBJECT" HorizontalAlignment="Right" Opacity=".6"/>
+                    <Label Grid.Row="0" Grid.Column="0" Content="SUBJECT" HorizontalAlignment="Right" Opacity=".6"/>
-                <TextBox Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="3" 
+                    <TextBox 
+                        Grid.Row="0" Grid.Column="1"
                         x:Name="subject"
                         IsReadOnly="True"
                         Background="Transparent"
@@ -163,8 +198,9 @@
                         Margin="8,0,16,0"/>
 
                     <!-- MESSAGE -->
-                <Label Grid.Row="6" Grid.Column="0" Content="DESCRIPTION" HorizontalAlignment="Right" VerticalAlignment="Top" Opacity=".6"/>
+                    <Label Grid.Row="1" Grid.Column="0" Content="DESCRIPTION" HorizontalAlignment="Right" VerticalAlignment="Top" Opacity=".6"/>
-                <TextBox Grid.Row="6" Grid.Column="1" Grid.ColumnSpan="3" 
+                    <TextBox 
+                        Grid.Row="1" Grid.Column="1"
                         x:Name="message"
                         IsReadOnly="True"
                         Background="Transparent"
@@ -172,15 +208,20 @@
                         VerticalAlignment="Center"
                         FontSize="11"
                         Margin="11,8,0,0"/>
+                </Grid>
 
-                <Rectangle Grid.Row="7" Grid.ColumnSpan="4" Height="1" Margin="8,0" Fill="{StaticResource Brush.Border2}"/>
+                <Rectangle Grid.Row="3" Grid.ColumnSpan="2" Height="1" Margin="8" Fill="{StaticResource Brush.Border2}"/>
 
-                <!-- CHANGELIST -->
+                <!-- Changes -->
-                <Label Grid.Row="8" Grid.Column="0" Content="CHANGED" HorizontalAlignment="Right" VerticalAlignment="Top" Opacity=".6"/>
+                <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.Row="8"
                         Grid.Column="1"
-                    Grid.ColumnSpan="3"
                         x:Name="changeList1"
                         RowHeight="20"
                         Margin="11,2,0,2">
@@ -214,6 +255,7 @@
                         </DataGrid.RowStyle>
                     </DataGrid>
                 </Grid>
+            </Grid>
         </TabItem>
 
         <!-- CHANGES -->

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>();
@@ -87,15 +96,43 @@ namespace SourceGit.UI {
             subject.Text = commit.Subject;
             message.Text = commit.Message.Trim();
 
-            if (commit.Decorators.Count == 0) lblRefs.Visibility = Visibility.Collapsed;
+            byte[] hash = MD5.Create().ComputeHash(Encoding.Default.GetBytes(commit.Author.Email.ToLower().Trim()));
-            else lblRefs.Visibility = Visibility.Visible;
+            string md5 = "";
+            for (int i = 0; i < hash.Length; i++) md5 += hash[i].ToString("x2");
+            md5 = md5.ToLower();
 
+            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;
                 }
             }
+        }
 
         private void NavigateParent(object sender, RequestNavigateEventArgs e) {
             repo.OnNavigateCommit?.Invoke(e.Uri.OriginalString);