feat: added git root detector

Author: biohazard999

Xenial.RTool.Tests/GitRepositoryDetectorTests.cs

@@ -56,4 +56,53 @@ public void DetectNotAGitRepository()
 
         isRepo.ShouldBeFalse("Should not be a git repository");
     }
+
+    [Fact]
+    public void DetectGitRoot()
+    {
+        var root = OperatingSystem.IsWindows()
+           ? @"c:\demo\"
+           : "/var/demo/";
+
+        var s = Path.DirectorySeparatorChar;
+
+        var fileSystem = new MockFileSystem(new Dictionary<string, MockFileData>
+        {
+            { @$"{root}myfile.txt", new MockFileData("Testing is meh.") },
+            { @$"{root}.git{s}index.js", new MockFileData("some js") },
+            { @$"{root}sub{s}image.gif", new MockFileData(new byte[] { 0x12, 0x34, 0x56, 0xd2 }) },
+            { @$"{root}sub{s}sub{s}image.gif", new MockFileData(new byte[] { 0x12, 0x34, 0x56, 0xd2 }) },
+            { @$"{root}sub{s}sub{s}sub{s}image.gif", new MockFileData(new byte[] { 0x12, 0x34, 0x56, 0xd2 }) },
+        });
+
+        var detector = new GitRepositoryDetector(fileSystem);
+        var cd = @$"{root}sub{s}sub{s}sub{s}";
+        var gitRoot = detector.DetectGitRootDirectory(cd);
+
+        gitRoot.ShouldBe(gitRoot);
+    }
+
+    [Fact]
+    public void DetectNotAGitRoot()
+    {
+        var root = OperatingSystem.IsWindows()
+           ? @"c:\demo\"
+           : "/var/demo/";
+
+        var s = Path.DirectorySeparatorChar;
+
+        var fileSystem = new MockFileSystem(new Dictionary<string, MockFileData>
+        {
+            { @$"{root}myfile.txt", new MockFileData("Testing is meh.") },
+            { @$"{root}sub{s}image.gif", new MockFileData(new byte[] { 0x12, 0x34, 0x56, 0xd2 }) },
+            { @$"{root}sub{s}sub{s}image.gif", new MockFileData(new byte[] { 0x12, 0x34, 0x56, 0xd2 }) },
+            { @$"{root}sub{s}sub{s}sub{s}image.gif", new MockFileData(new byte[] { 0x12, 0x34, 0x56, 0xd2 }) },
+        });
+
+        var detector = new GitRepositoryDetector(fileSystem);
+        var cd = @$"{root}sub{s}sub{s}sub{s}";
+        var gitRoot = detector.DetectGitRootDirectory(cd);
+
+        gitRoot.ShouldBeNull("Should not be a git repository");
+    }
 }

Xenial.RTool.Tests/ReleaseApplicationTests.cs

@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.IO.Abstractions.TestingHelpers;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
+using System.IO.Abstractions.TestingHelpers;
 
 using FakeItEasy;
 

Xenial.RTool/GitRepositoryDetector.cs

@@ -2,7 +2,9 @@
 
 namespace Xenial.RTool;
 
-public sealed record GitRepositoryDetector(IFileSystem FileSystem) : IGitRepositoryDetector
+public sealed record GitRepositoryDetector(IFileSystem FileSystem) 
+    : IGitRepositoryDetector, 
+    IGitRepositoryRootDetector
 {
     public bool DetectGitRepository(string? cd = null)
     {
@@ -29,4 +31,30 @@ static bool Locate(IDirectoryInfo? directoryInfo)
 
         return Locate(directoryInfo);
     }
+
+    public string? DetectGitRootDirectory(string? cd = null)
+    {
+        cd = cd ?? Environment.CurrentDirectory;
+        var directoryInfo = FileSystem.DirectoryInfo.FromDirectoryName(cd);
+
+        static string? Locate(IDirectoryInfo? directoryInfo)
+        {
+            if (directoryInfo is null)
+            {
+                return null;
+            }
+
+            foreach (var file in directoryInfo.EnumerateDirectories("*.*", SearchOption.TopDirectoryOnly))
+            {
+                if (file.Name.Equals(".git", StringComparison.InvariantCultureIgnoreCase))
+                {
+                    return directoryInfo.FullName;
+                }
+            }
+
+            return Locate(directoryInfo.Parent);
+        }
+
+        return Locate(directoryInfo);
+    }
 }

Xenial.RTool/IGitRepositoryDetector.cs

@@ -3,4 +3,8 @@
 public interface IGitRepositoryDetector
 {
     bool DetectGitRepository(string? cd = null);
+}
+public interface IGitRepositoryRootDetector
+{
+    string? DetectGitRootDirectory(string? cd = null);
 }