diff --git a/SourceGit/UI/Preference.xaml b/SourceGit/UI/Preference.xaml
index 2059583d..6cfebc45 100644
--- a/SourceGit/UI/Preference.xaml
+++ b/SourceGit/UI/Preference.xaml
@@ -1,131 +1,148 @@
-<UserControl x:Class="SourceGit.UI.Preference"
-        x:Name="me"
-        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-        xmlns:helpers="clr-namespace:SourceGit.Helpers"
-        xmlns:app="clr-namespace:SourceGit"
-        xmlns:git="clr-namespace:SourceGit.Git"
-        mc:Ignorable="d"
-        Height="472" Width="500">
-    <Grid>
-        <Grid.RowDefinitions>
-            <RowDefinition Height="36"/>
-            <RowDefinition Height="28"/>
-            <RowDefinition Height="18"/>
-            <RowDefinition Height="36"/>
-            <RowDefinition Height="28"/>
-            <RowDefinition Height="28"/>
-            <RowDefinition Height="18"/>
-            <RowDefinition Height="36"/>
-            <RowDefinition Height="28"/>
-            <RowDefinition Height="28"/>
-            <RowDefinition Height="18"/>
-            <RowDefinition Height="36"/>
-            <RowDefinition Height="28"/>
-            <RowDefinition Height="28"/>
-            <RowDefinition Height="28"/>
-            <RowDefinition Height="18"/>
-            <RowDefinition Height="32"/>
-        </Grid.RowDefinitions>
-
-        <Grid.ColumnDefinitions>
-            <ColumnDefinition Width="120"/>
-            <ColumnDefinition MinWidth="200" Width="*"/>
-        </Grid.ColumnDefinitions>
-        
-        <!-- 显示 -->
-        <Label Grid.Row="0" Grid.ColumnSpan="2" Content="APPEARANCE" FontSize="16" FontWeight="DemiBold" Opacity=".85"/>
-        <Label Grid.Row="1" Grid.Column="0" Content="Light Theme :" HorizontalAlignment="Right"/>
-        <CheckBox 
-            Grid.Row="1" 
-            Grid.Column="1" 
-            IsChecked="{Binding Source={x:Static app:App.Preference}, Path=UIUseLightTheme, Mode=TwoWay}"
-            Content="Restart required"
-            TextElement.FontStyle="Italic"/>
-
-        <!-- GIT相关配置 -->
-        <Label Grid.Row="3" Grid.ColumnSpan="2" Content="GIT INSTANCE" FontSize="16" FontWeight="DemiBold" Opacity=".85"/>
-        <Label Grid.Row="4" Grid.Column="0" Content="Install Path :" HorizontalAlignment="Right"/>
-        <Grid Grid.Row="4" Grid.Column="1">
-            <Grid.ColumnDefinitions>
-                <ColumnDefinition Width="*"/>
-                <ColumnDefinition Width="28"/>
-            </Grid.ColumnDefinitions>
-
-            <TextBox Grid.Column="0"
-                         x:Name="txtGitPath"
-                         Height="24" 
-                         Text="{Binding Source={x:Static app:App.Preference}, Path=GitExecutable, Mode=TwoWay}"
-                         helpers:TextBoxHelper.Placeholder="Input path for git.exe"/>
-            <Button Grid.Column="1" Width="24" Height="24" Click="SelectGitPath" Padding="0" BorderThickness="1" Style="{StaticResource Style.Button.Bordered}">
-                <Path Width="14" Style="{StaticResource Style.Icon}" Data="{StaticResource Icon.Folder}"/>
-            </Button>
-        </Grid>
-        <Label Grid.Row="5" Grid.Column="0" Content="Default Clone Dir :" HorizontalAlignment="Right"/>
-        <Grid Grid.Row="5" Grid.Column="1">
-            <Grid.ColumnDefinitions>
-                <ColumnDefinition Width="*"/>
-                <ColumnDefinition Width="28"/>
-            </Grid.ColumnDefinitions>
-
-            <TextBox Grid.Column="0" 
-                         x:Name="txtGitCloneDir"
-                         Height="24" 
-                         Text="{Binding Source={x:Static app:App.Preference}, Path=GitDefaultCloneDir, Mode=TwoWay}"
-                         helpers:TextBoxHelper.Placeholder="Default path to clone repo into"/>
-            <Button Grid.Column="1" Width="24" Height="24" Click="SelectDefaultClonePath" Padding="0" BorderThickness="1" Style="{StaticResource Style.Button.Bordered}">
-                <Path Width="14" Style="{StaticResource Style.Icon}" Data="{StaticResource Icon.Folder}"/>
-            </Button>
-        </Grid>
-        
-        <!-- Global User -->
-        <Label Grid.Row="7" Grid.ColumnSpan="2" Content="GLOBAL USER" FontSize="16" FontWeight="DemiBold" Opacity=".85"/>
-        <Label Grid.Row="8" Grid.Column="0" Content="Name :" HorizontalAlignment="Right"/>
-        <TextBox Grid.Row="8" Grid.Column="1" Height="24" helpers:TextBoxHelper.Placeholder="Global git user name" Text="{Binding ElementName=me, Path=GlobalUser, Mode=TwoWay}"/>
-        <Label Grid.Row="9" Grid.Column="0" Content="Email :" HorizontalAlignment="Right"/>
-        <TextBox Grid.Row="9" Grid.Column="1" Height="24" helpers:TextBoxHelper.Placeholder="Global git user email" Text="{Binding ElementName=me, Path=GlobalUserEmail, Mode=TwoWay}"/>
-
-        <!-- 合并工具配置 -->
-        <Label Grid.Row="11" Grid.ColumnSpan="2" Content="MERGE TOOL" FontSize="16" FontWeight="DemiBold" Opacity=".85"/>
-        <Label Grid.Row="12" Grid.Column="0" Content="Choose Merger :" HorizontalAlignment="Right"/>
-        <ComboBox Grid.Row="12" Grid.Column="1"
-             Height="24"
-             Padding="2,0,0,0"
-             HorizontalContentAlignment="Left"
-             VerticalContentAlignment="Center"
-             SelectedIndex="{Binding Source={x:Static app:App.Preference}, Path=MergeTool, Mode=TwoWay}"
-             ItemsSource="{Binding Source={x:Static git:MergeTool.Supported}}"
-             DisplayMemberPath="Name"
-             SelectionChanged="ChangeMergeTool"/>
-        <Label Grid.Row="13" Grid.Column="0" Content="Install Path :" HorizontalAlignment="Right"/>
-        <Grid Grid.Row="13" Grid.Column="1">
-            <Grid.ColumnDefinitions>
-                <ColumnDefinition Width="*"/>
-                <ColumnDefinition Width="28"/>
-            </Grid.ColumnDefinitions>
-
-            <TextBox Grid.Column="0" 
-                         x:Name="txtMergePath"
-                         Height="24" 
-                         Text="{Binding Source={x:Static app:App.Preference}, Path=MergeExecutable, Mode=TwoWay}"
-                         helpers:TextBoxHelper.Placeholder="Input path for merge tool"/>
-            <Button Grid.Column="1" Width="24" Height="24" Click="SelectMergeToolPath" Padding="0" BorderThickness="1" Style="{StaticResource Style.Button.Bordered}">
-                <Path Width="14" Style="{StaticResource Style.Icon}" Data="{StaticResource Icon.Folder}"/>
-            </Button>
-        </Grid>
-        <Label Grid.Row="14" Grid.Column="0" Content="Command :" HorizontalAlignment="Right"/>
-        <TextBlock Grid.Row="14" Grid.Column="1" 
-                   x:Name="txtMergeParam"
-                   VerticalAlignment="Center"
-                   Foreground="{StaticResource Brush.FG2}"/>
-
-        <Button Grid.Row="16" Grid.Column="1" 
-                Content="CLOSE"
-                Click="Close"
-                Width="80"
-                Style="{StaticResource Style.Button.AccentBordered}"
-                HorizontalAlignment="Right"/>
-    </Grid>
+<UserControl x:Class="SourceGit.UI.Preference"
+        x:Name="me"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:helpers="clr-namespace:SourceGit.Helpers"
+        xmlns:app="clr-namespace:SourceGit"
+        xmlns:git="clr-namespace:SourceGit.Git"
+        mc:Ignorable="d"
+        Height="500" Width="500">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="36"/>
+            <RowDefinition Height="28"/>
+            <RowDefinition Height="18"/>
+            <RowDefinition Height="36"/>
+            <RowDefinition Height="28"/>
+            <RowDefinition Height="28"/>
+            <RowDefinition Height="18"/>
+            <RowDefinition Height="36"/>
+            <RowDefinition Height="28"/>
+            <RowDefinition Height="28"/>
+            <RowDefinition Height="28"/>
+            <RowDefinition Height="18"/>
+            <RowDefinition Height="36"/>
+            <RowDefinition Height="28"/>
+            <RowDefinition Height="28"/>
+            <RowDefinition Height="28"/>
+            <RowDefinition Height="18"/>
+            <RowDefinition Height="32"/>
+        </Grid.RowDefinitions>
+
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="120"/>
+            <ColumnDefinition MinWidth="200" Width="*"/>
+        </Grid.ColumnDefinitions>
+        
+        <!-- 显示 -->
+        <Label Grid.Row="0" Grid.ColumnSpan="2" Content="APPEARANCE" FontSize="16" FontWeight="DemiBold" Opacity=".85"/>
+        <Label Grid.Row="1" Grid.Column="0" Content="Light Theme :" HorizontalAlignment="Right"/>
+        <CheckBox 
+            Grid.Row="1" 
+            Grid.Column="1" 
+            IsChecked="{Binding Source={x:Static app:App.Preference}, Path=UIUseLightTheme, Mode=TwoWay}"
+            Content="Restart required"
+            TextElement.FontStyle="Italic"/>
+
+        <!-- GIT相关配置 -->
+        <Label Grid.Row="3" Grid.ColumnSpan="2" Content="GIT INSTANCE" FontSize="16" FontWeight="DemiBold" Opacity=".85"/>
+        <Label Grid.Row="4" Grid.Column="0" Content="Install Path :" HorizontalAlignment="Right"/>
+        <Grid Grid.Row="4" Grid.Column="1">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="*"/>
+                <ColumnDefinition Width="28"/>
+            </Grid.ColumnDefinitions>
+
+            <TextBox Grid.Column="0"
+                         x:Name="txtGitPath"
+                         Height="24" 
+                         Text="{Binding Source={x:Static app:App.Preference}, Path=GitExecutable, Mode=TwoWay}"
+                         helpers:TextBoxHelper.Placeholder="Input path for git.exe"/>
+            <Button Grid.Column="1" Width="24" Height="24" Click="SelectGitPath" Padding="0" BorderThickness="1" Style="{StaticResource Style.Button.Bordered}">
+                <Path Width="14" Style="{StaticResource Style.Icon}" Data="{StaticResource Icon.Folder}"/>
+            </Button>
+        </Grid>
+        <Label Grid.Row="5" Grid.Column="0" Content="Default Clone Dir :" HorizontalAlignment="Right"/>
+        <Grid Grid.Row="5" Grid.Column="1">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="*"/>
+                <ColumnDefinition Width="28"/>
+            </Grid.ColumnDefinitions>
+
+            <TextBox Grid.Column="0" 
+                         x:Name="txtGitCloneDir"
+                         Height="24" 
+                         Text="{Binding Source={x:Static app:App.Preference}, Path=GitDefaultCloneDir, Mode=TwoWay}"
+                         helpers:TextBoxHelper.Placeholder="Default path to clone repo into"/>
+            <Button Grid.Column="1" Width="24" Height="24" Click="SelectDefaultClonePath" Padding="0" BorderThickness="1" Style="{StaticResource Style.Button.Bordered}">
+                <Path Width="14" Style="{StaticResource Style.Icon}" Data="{StaticResource Icon.Folder}"/>
+            </Button>
+        </Grid>
+        
+        <!-- Global User -->
+        <Label Grid.Row="7" Grid.ColumnSpan="2" Content="GLOBAL SETTING" FontSize="16" FontWeight="DemiBold" Opacity=".85"/>
+        <Label Grid.Row="8" Grid.Column="0" Content="Name :" HorizontalAlignment="Right"/>
+        <TextBox Grid.Row="8" Grid.Column="1" Height="24" helpers:TextBoxHelper.Placeholder="Global git user name" Text="{Binding ElementName=me, Path=GlobalUser, Mode=TwoWay}"/>
+        <Label Grid.Row="9" Grid.Column="0" Content="Email :" HorizontalAlignment="Right"/>
+        <TextBox Grid.Row="9" Grid.Column="1" Height="24" helpers:TextBoxHelper.Placeholder="Global git user email" Text="{Binding ElementName=me, Path=GlobalUserEmail, Mode=TwoWay}"/>
+        <Label Grid.Row="10" Grid.Column="0" Content="Auto CRLF :" HorizontalAlignment="Right"/>
+        <ComboBox Grid.Row="10" Grid.Column="1"
+                  x:Name="cmbAutoCRLF"
+                  Height="24"
+                  HorizontalAlignment="Stretch"
+                  VerticalContentAlignment="Center"
+                  SelectionChanged="AutoCRLFSelectionChanged">
+            <ComboBox.ItemTemplate>
+                <DataTemplate>
+                    <StackPanel Orientation="Horizontal" Height="20">
+                        <Label Content="{Binding Value}" Padding="0" VerticalContentAlignment="Center"/>
+                        <Label Content="{Binding Desc}" Foreground="{StaticResource Brush.FG2}" FontSize="10" Margin="8,0,0,0" Padding="0"/>
+                    </StackPanel>
+                </DataTemplate>
+            </ComboBox.ItemTemplate>
+        </ComboBox>
+
+        <!-- 合并工具配置 -->
+        <Label Grid.Row="12" Grid.ColumnSpan="2" Content="MERGE TOOL" FontSize="16" FontWeight="DemiBold" Opacity=".85"/>
+        <Label Grid.Row="13" Grid.Column="0" Content="Choose Merger :" HorizontalAlignment="Right"/>
+        <ComboBox Grid.Row="13" Grid.Column="1"
+             Height="24"
+             Padding="2,0,0,0"
+             HorizontalContentAlignment="Left"
+             VerticalContentAlignment="Center"
+             SelectedIndex="{Binding Source={x:Static app:App.Preference}, Path=MergeTool, Mode=TwoWay}"
+             ItemsSource="{Binding Source={x:Static git:MergeTool.Supported}}"
+             DisplayMemberPath="Name"
+             SelectionChanged="ChangeMergeTool"/>
+        <Label Grid.Row="14" Grid.Column="0" Content="Install Path :" HorizontalAlignment="Right"/>
+        <Grid Grid.Row="14" Grid.Column="1">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="*"/>
+                <ColumnDefinition Width="28"/>
+            </Grid.ColumnDefinitions>
+
+            <TextBox Grid.Column="0" 
+                         x:Name="txtMergePath"
+                         Height="24" 
+                         Text="{Binding Source={x:Static app:App.Preference}, Path=MergeExecutable, Mode=TwoWay}"
+                         helpers:TextBoxHelper.Placeholder="Input path for merge tool"/>
+            <Button Grid.Column="1" Width="24" Height="24" Click="SelectMergeToolPath" Padding="0" BorderThickness="1" Style="{StaticResource Style.Button.Bordered}">
+                <Path Width="14" Style="{StaticResource Style.Icon}" Data="{StaticResource Icon.Folder}"/>
+            </Button>
+        </Grid>
+        <Label Grid.Row="15" Grid.Column="0" Content="Command :" HorizontalAlignment="Right"/>
+        <TextBlock Grid.Row="15" Grid.Column="1" 
+                   x:Name="txtMergeParam"
+                   VerticalAlignment="Center"
+                   Foreground="{StaticResource Brush.FG2}"/>
+
+        <Button Grid.Row="17" Grid.Column="1" 
+                Content="CLOSE"
+                Click="Close"
+                Width="80"
+                Style="{StaticResource Style.Button.AccentBordered}"
+                HorizontalAlignment="Right"/>
+    </Grid>
 </UserControl>
\ No newline at end of file
diff --git a/SourceGit/UI/Preference.xaml.cs b/SourceGit/UI/Preference.xaml.cs
index a9785d0a..ce699e91 100644
--- a/SourceGit/UI/Preference.xaml.cs
+++ b/SourceGit/UI/Preference.xaml.cs
@@ -1,178 +1,227 @@
-using Microsoft.Win32;
-using System;
-using System.Diagnostics;
-using System.Text;
-using System.Windows;
-using System.Windows.Controls;
-
-namespace SourceGit.UI {
-
-    /// <summary>
-    ///     Preference window.
-    /// </summary>
-    public partial class Preference : UserControl {
-
-        /// <summary>
-        ///     Git global user name.
-        /// </summary>
-        public string GlobalUser {
-            get;
-            set;
-        }
-
-        /// <summary>
-        ///     Git global user email.
-        /// </summary>
-        public string GlobalUserEmail {
-            get;
-            set;
-        }
-
-        /// <summary>
-        ///     Constructor.
-        /// </summary>
-        public Preference() {
-            GlobalUser = GetConfig("user.name");
-            GlobalUserEmail = GetConfig("user.email");
-
-            InitializeComponent();
-
-            int mergeType = App.Preference.MergeTool;
-            var merger = Git.MergeTool.Supported[mergeType];
-            txtMergePath.IsReadOnly = !merger.IsConfigured;
-            txtMergeParam.Text = merger.Parameter;
-        }
-
-        /// <summary>
-        ///     Show preference.
-        /// </summary>
-        public static void Show() {
-            PopupManager.Show(new Preference());
-        }
-
-        /// <summary>
-        ///     Close this dialog
-        /// </summary>
-        private void Close(object sender, RoutedEventArgs e) {
-            var oldUser = GetConfig("user.name");
-            if (oldUser != GlobalUser) SetConfig("user.name", GlobalUser);
-
-            var oldEmail = GetConfig("user.email");
-            if (oldEmail != GlobalUserEmail) SetConfig("user.email", GlobalUserEmail);
-
-            PopupManager.Close();
-        }
-
-        /// <summary>
-        ///     Select git executable file path.
-        /// </summary>
-        /// <param name="sender"></param>
-        /// <param name="e"></param>
-        private void SelectGitPath(object sender, RoutedEventArgs e) {
-            var dialog = new OpenFileDialog();
-            dialog.Filter = "Git Executable|git.exe";
-            dialog.FileName = "git.exe";
-            dialog.Title = "Select Git Executable File";
-            dialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles);
-            dialog.CheckFileExists = true;
-
-            if (dialog.ShowDialog() == true) {
-                txtGitPath.Text = dialog.FileName;
-                App.Preference.GitExecutable = dialog.FileName;
-            }
-        }
-
-        /// <summary>
-        ///     Set default clone path.
-        /// </summary>
-        /// <param name="sender"></param>
-        /// <param name="e"></param>
-        private void SelectDefaultClonePath(object sender, RoutedEventArgs e) {
-            var dialog = new System.Windows.Forms.FolderBrowserDialog();
-            dialog.Description = "Select Folder To Clone Repository Into As Default";
-            dialog.RootFolder = Environment.SpecialFolder.MyComputer;
-            dialog.ShowNewFolderButton = true;
-
-            if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK) {
-                txtGitCloneDir.Text = dialog.SelectedPath;
-                App.Preference.GitDefaultCloneDir = dialog.SelectedPath;
-            }
-        }
-
-        /// <summary>
-        ///     Choose external merge tool.
-        /// </summary>
-        /// <param name="sender"></param>
-        /// <param name="e"></param>
-        private void ChangeMergeTool(object sender, SelectionChangedEventArgs e) {
-            if (IsLoaded) {
-                var t = Git.MergeTool.Supported[App.Preference.MergeTool];
-
-                App.Preference.MergeExecutable = t.Finder();
-
-                txtMergePath.Text = App.Preference.MergeExecutable;
-                txtMergeParam.Text = t.Parameter;
-                txtMergePath.IsReadOnly = !t.IsConfigured;
-            }
-        }
-
-        /// <summary>
-        ///     Set merge tool executable file path.
-        /// </summary>
-        /// <param name="sender"></param>
-        /// <param name="e"></param>
-        private void SelectMergeToolPath(object sender, RoutedEventArgs e) {
-            int mergeType = App.Preference.MergeTool;
-            if (mergeType == 0) return;
-
-            var merger = Git.MergeTool.Supported[mergeType];
-            var dialog = new OpenFileDialog();
-            dialog.Filter = $"{merger.Name} Executable|{merger.ExecutableName}";
-            dialog.Title = $"Select {merger.Name} Install Path";
-            dialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles);
-            dialog.CheckFileExists = true;
-
-            if (dialog.ShowDialog() == true) {
-                txtMergePath.Text = dialog.FileName;
-                App.Preference.MergeExecutable = dialog.FileName;
-            }
-        }
-
-        #region CONFIG
-        private string GetConfig(string key) {
-            if (!App.IsGitConfigured) return "";
-
-            var startInfo = new ProcessStartInfo();
-            startInfo.FileName = App.Preference.GitExecutable;
-            startInfo.Arguments = $"config --global {key}";
-            startInfo.UseShellExecute = false;
-            startInfo.CreateNoWindow = true;
-            startInfo.RedirectStandardOutput = true;
-            startInfo.StandardOutputEncoding = Encoding.UTF8;
-
-            var proc = new Process() { StartInfo = startInfo };
-            proc.Start();
-            var output = proc.StandardOutput.ReadToEnd();
-            proc.WaitForExit();
-            proc.Close();
-
-            return output.Trim();
-        }
-
-        private void SetConfig(string key, string val) {
-            if (!App.IsGitConfigured) return;
-
-            var startInfo = new ProcessStartInfo();
-            startInfo.FileName = App.Preference.GitExecutable;
-            startInfo.Arguments = $"config --global {key} \"{val}\"";
-            startInfo.UseShellExecute = false;
-            startInfo.CreateNoWindow = true;
-
-            var proc = new Process() { StartInfo = startInfo };
-            proc.Start();
-            proc.WaitForExit();
-            proc.Close();
-        }
-        #endregion
-    }
-}
+using Microsoft.Win32;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace SourceGit.UI {
+
+    /// <summary>
+    ///     Preference window.
+    /// </summary>
+    public partial class Preference : UserControl {
+
+        /// <summary>
+        ///     Git global user name.
+        /// </summary>
+        public string GlobalUser {
+            get;
+            set;
+        }
+
+        /// <summary>
+        ///     Git global user email.
+        /// </summary>
+        public string GlobalUserEmail {
+            get;
+            set;
+        }
+
+        /// <summary>
+        ///     Git core.autocrlf setting.
+        /// </summary>
+        public string AutoCRLF {
+            get;
+            set;
+        }
+
+        /// <summary>
+        ///     Options for core.autocrlf
+        /// </summary>
+        public class AutoCRLFOption {
+            public string Value { get; set; }
+            public string Desc { get; set; }
+            
+            public AutoCRLFOption(string v, string d) {
+                Value = v;
+                Desc = d;
+            }
+        }
+
+        /// <summary>
+        ///     Constructor.
+        /// </summary>
+        public Preference() {
+            GlobalUser = GetConfig("user.name");
+            GlobalUserEmail = GetConfig("user.email");
+            AutoCRLF = GetConfig("core.autocrlf");
+            if (string.IsNullOrEmpty(AutoCRLF)) AutoCRLF = "false";
+
+            InitializeComponent();
+
+            int mergeType = App.Preference.MergeTool;
+            var merger = Git.MergeTool.Supported[mergeType];
+            txtMergePath.IsReadOnly = !merger.IsConfigured;
+            txtMergeParam.Text = merger.Parameter;
+
+            var crlfOptions = new List<AutoCRLFOption>() {
+                new AutoCRLFOption("true", "Commit as LF, checkout as CRLF"),
+                new AutoCRLFOption("input", "Only convert for commit"),
+                new AutoCRLFOption("false", "Do NOT convert"),
+            };
+            cmbAutoCRLF.ItemsSource = crlfOptions;
+            cmbAutoCRLF.SelectedItem = crlfOptions.Find(o => o.Value == AutoCRLF);
+        }
+
+        /// <summary>
+        ///     Show preference.
+        /// </summary>
+        public static void Show() {
+            PopupManager.Show(new Preference());
+        }
+
+        /// <summary>
+        ///     Close this dialog
+        /// </summary>
+        private void Close(object sender, RoutedEventArgs e) {
+            var oldUser = GetConfig("user.name");
+            if (oldUser != GlobalUser) SetConfig("user.name", GlobalUser);
+
+            var oldEmail = GetConfig("user.email");
+            if (oldEmail != GlobalUserEmail) SetConfig("user.email", GlobalUserEmail);
+
+            var oldAutoCRLF = GetConfig("core.autocrlf");
+            if (oldAutoCRLF != AutoCRLF) SetConfig("core.autocrlf", AutoCRLF);
+
+            PopupManager.Close();
+        }
+
+        /// <summary>
+        ///     Select git executable file path.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void SelectGitPath(object sender, RoutedEventArgs e) {
+            var dialog = new OpenFileDialog();
+            dialog.Filter = "Git Executable|git.exe";
+            dialog.FileName = "git.exe";
+            dialog.Title = "Select Git Executable File";
+            dialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles);
+            dialog.CheckFileExists = true;
+
+            if (dialog.ShowDialog() == true) {
+                txtGitPath.Text = dialog.FileName;
+                App.Preference.GitExecutable = dialog.FileName;
+            }
+        }
+
+        /// <summary>
+        ///     Set default clone path.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void SelectDefaultClonePath(object sender, RoutedEventArgs e) {
+            var dialog = new System.Windows.Forms.FolderBrowserDialog();
+            dialog.Description = "Select Folder To Clone Repository Into As Default";
+            dialog.RootFolder = Environment.SpecialFolder.MyComputer;
+            dialog.ShowNewFolderButton = true;
+
+            if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK) {
+                txtGitCloneDir.Text = dialog.SelectedPath;
+                App.Preference.GitDefaultCloneDir = dialog.SelectedPath;
+            }
+        }
+
+        /// <summary>
+        ///     Choose external merge tool.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void ChangeMergeTool(object sender, SelectionChangedEventArgs e) {
+            if (IsLoaded) {
+                var t = Git.MergeTool.Supported[App.Preference.MergeTool];
+
+                App.Preference.MergeExecutable = t.Finder();
+
+                txtMergePath.Text = App.Preference.MergeExecutable;
+                txtMergeParam.Text = t.Parameter;
+                txtMergePath.IsReadOnly = !t.IsConfigured;
+            }
+        }
+
+        /// <summary>
+        ///     Set merge tool executable file path.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void SelectMergeToolPath(object sender, RoutedEventArgs e) {
+            int mergeType = App.Preference.MergeTool;
+            if (mergeType == 0) return;
+
+            var merger = Git.MergeTool.Supported[mergeType];
+            var dialog = new OpenFileDialog();
+            dialog.Filter = $"{merger.Name} Executable|{merger.ExecutableName}";
+            dialog.Title = $"Select {merger.Name} Install Path";
+            dialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles);
+            dialog.CheckFileExists = true;
+
+            if (dialog.ShowDialog() == true) {
+                txtMergePath.Text = dialog.FileName;
+                App.Preference.MergeExecutable = dialog.FileName;
+            }
+        }
+
+        /// <summary>
+        ///     Set core.autocrlf
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void AutoCRLFSelectionChanged(object sender, SelectionChangedEventArgs e) {
+            if (e.AddedItems.Count != 1) return;
+
+            var mode = e.AddedItems[0] as AutoCRLFOption;
+            if (mode == null) return;
+
+            AutoCRLF = mode.Value;
+        }
+
+        #region CONFIG
+        private string GetConfig(string key) {
+            if (!App.IsGitConfigured) return "";
+
+            var startInfo = new ProcessStartInfo();
+            startInfo.FileName = App.Preference.GitExecutable;
+            startInfo.Arguments = $"config --global {key}";
+            startInfo.UseShellExecute = false;
+            startInfo.CreateNoWindow = true;
+            startInfo.RedirectStandardOutput = true;
+            startInfo.StandardOutputEncoding = Encoding.UTF8;
+
+            var proc = new Process() { StartInfo = startInfo };
+            proc.Start();
+            var output = proc.StandardOutput.ReadToEnd();
+            proc.WaitForExit();
+            proc.Close();
+
+            return output.Trim();
+        }
+
+        private void SetConfig(string key, string val) {
+            if (!App.IsGitConfigured) return;
+
+            var startInfo = new ProcessStartInfo();
+            startInfo.FileName = App.Preference.GitExecutable;
+            startInfo.Arguments = $"config --global {key} \"{val}\"";
+            startInfo.UseShellExecute = false;
+            startInfo.CreateNoWindow = true;
+
+            var proc = new Process() { StartInfo = startInfo };
+            proc.Start();
+            proc.WaitForExit();
+            proc.Close();
+        }
+        #endregion
+    }
+}