feature: show conflict reason

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

src/Commands/QueryLocalChanges.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Text.RegularExpressions;
+
 using Avalonia.Threading;
 
 namespace SourceGit.Commands
@@ -128,12 +129,31 @@ namespace SourceGit.Commands
                         change.Set(Models.ChangeState.Deleted, Models.ChangeState.Copied);
                         break;
                     case "DD":
+                        change.ConflictReason = Models.ConflictReason.BothDeleted;
+                        change.Set(Models.ChangeState.None, Models.ChangeState.Conflicted);
+                        break;
                     case "AU":
+                        change.ConflictReason = Models.ConflictReason.AddedByUs;
+                        change.Set(Models.ChangeState.None, Models.ChangeState.Conflicted);
+                        break;
                     case "UD":
+                        change.ConflictReason = Models.ConflictReason.DeletedByThem;
+                        change.Set(Models.ChangeState.None, Models.ChangeState.Conflicted);
+                        break;
                     case "UA":
+                        change.ConflictReason = Models.ConflictReason.AddedByThem;
+                        change.Set(Models.ChangeState.None, Models.ChangeState.Conflicted);
+                        break;
                     case "DU":
+                        change.ConflictReason = Models.ConflictReason.DeletedByUs;
+                        change.Set(Models.ChangeState.None, Models.ChangeState.Conflicted);
+                        break;
                     case "AA":
+                        change.ConflictReason = Models.ConflictReason.BothAdded;
+                        change.Set(Models.ChangeState.None, Models.ChangeState.Conflicted);
+                        break;
                     case "UU":
+                        change.ConflictReason = Models.ConflictReason.BothModified;
                         change.Set(Models.ChangeState.None, Models.ChangeState.Conflicted);
                         break;
                     case "??":

src/Models/Change.cs

@@ -22,6 +22,18 @@ namespace SourceGit.Models
         Conflicted,
     }
 
+    public enum ConflictReason
+    {
+        None,
+        BothDeleted,
+        AddedByUs,
+        DeletedByThem,
+        AddedByThem,
+        DeletedByUs,
+        BothAdded,
+        BothModified,
+    }
+
     public class ChangeDataForAmend
     {
         public string FileMode { get; set; } = "";
@@ -36,6 +48,8 @@ namespace SourceGit.Models
         public string Path { get; set; } = "";
         public string OriginalPath { get; set; } = "";
         public ChangeDataForAmend DataForAmend { get; set; } = null;
+        public ConflictReason ConflictReason { get; set; } = ConflictReason.None;
+        public bool IsSubmodule { get; set; } = false;
         public bool IsConflicted => WorkTree == ChangeState.Conflicted;
 
         public void Set(ChangeState index, ChangeState workTree = ChangeState.None)

src/ViewModels/Conflict.cs

@@ -25,6 +25,18 @@ namespace SourceGit.ViewModels
 
     public class Conflict
     {
+        public string Marker
+        {
+            get;
+            private set;
+        }
+
+        public string Description
+        {
+            get;
+            private set;
+        }
+        
         public object Theirs
         {
             get;
@@ -41,7 +53,13 @@ namespace SourceGit.ViewModels
         {
             get;
             private set;
-        }
+        } = false;
+
+        public bool CanUseExternalMergeTool
+        {
+            get;
+            private set;
+        } = false;
 
         public Conflict(Repository repo, WorkingCopy wc, Models.Change change)
         {
@@ -49,7 +67,51 @@ namespace SourceGit.ViewModels
             _change = change;
 
             var isSubmodule = repo.Submodules.Find(x => x.Path.Equals(change.Path, StringComparison.Ordinal)) != null;
-            IsResolved = !isSubmodule && new Commands.IsConflictResolved(repo.FullPath, change).Result();
+            switch (change.ConflictReason)
+            {
+                case Models.ConflictReason.BothDeleted:
+                    Marker = "DD";
+                    Description = "Both deleted";
+                    break;
+                case Models.ConflictReason.AddedByUs:
+                    Marker = "AU";
+                    Description = "Added by us";
+                    break;
+                case Models.ConflictReason.DeletedByThem:
+                    Marker = "UD";
+                    Description = "Deleted by them";
+                    break;
+                case Models.ConflictReason.AddedByThem:
+                    Marker = "UA";
+                    Description = "Added by them";
+                    break;
+                case Models.ConflictReason.DeletedByUs:
+                    Marker = "DU";
+                    Description = "Deleted by us";
+                    break;
+                case Models.ConflictReason.BothAdded:
+                    Marker = "AA";
+                    Description = "Both added";
+                    if (!isSubmodule)
+                    {
+                        CanUseExternalMergeTool = true;
+                        IsResolved = new Commands.IsConflictResolved(repo.FullPath, change).Result();
+                    }
+                    break;
+                case Models.ConflictReason.BothModified:
+                    Marker = "UU";
+                    Description = "Both modified";
+                    if (!isSubmodule)
+                    {
+                        CanUseExternalMergeTool = true;
+                        IsResolved = new Commands.IsConflictResolved(repo.FullPath, change).Result();
+                    }
+                    break;
+                default:
+                    Marker = string.Empty;
+                    Description = string.Empty;
+                    break;
+            }
 
             var context = wc.InProgressContext;
             if (context is CherryPickInProgress cherryPick)

src/Views/Conflict.axaml

@@ -15,6 +15,14 @@
         <Path Width="64" Height="64" Data="{StaticResource Icons.Conflict}" Fill="{DynamicResource Brush.FG2}" HorizontalAlignment="Center"/>
         <TextBlock Margin="0,16" FontSize="20" FontWeight="Bold" Text="{DynamicResource Text.WorkingCopy.Conflicts}" Foreground="{DynamicResource Brush.FG2}" HorizontalAlignment="Center"/>
         
+        <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" Margin="0,0,0,8">
+          <Border Height="16" VerticalAlignment="Center" Background="Red" CornerRadius="8">
+            <TextBlock Classes="primary" Text="{Binding Marker}" Foreground="White" FontWeight="Bold" Margin="8,0" FontSize="10"/>
+          </Border>
+          
+          <TextBlock Margin="8,0,0,0" VerticalAlignment="Center" Text="{Binding Description}"/>
+        </StackPanel>
+        
         <Border Margin="16,0" Padding="8" CornerRadius="4" BorderThickness="1" BorderBrush="{DynamicResource Brush.Border2}">
           <Border.DataTemplates>
             <DataTemplate DataType="vm:ConflictSourceBranch">
@@ -117,7 +125,7 @@
               <TextBlock Margin="6,0,0,0" Text="{DynamicResource Text.WorkingCopy.Conflicts.UseMine}" VerticalAlignment="Center"/>
             </StackPanel>
           </Button>
-          <Button Classes="flat" Margin="8,0,0,0" Command="{Binding OpenExternalMergeTool}">
+          <Button Classes="flat" Margin="8,0,0,0" Command="{Binding OpenExternalMergeTool}" IsVisible="{Binding CanUseExternalMergeTool}">
             <StackPanel Orientation="Horizontal">
               <Path Width="12" Height="12" Data="{StaticResource Icons.OpenWith}"/>
               <TextBlock Margin="6,0,0,0" Text="{DynamicResource Text.WorkingCopy.Conflicts.OpenExternalMergeTool}" VerticalAlignment="Center"/>