fixup! Fixed: Updating series path from different OS paths

src/NzbDrone.Common.Test/PathExtensionFixture.cs

@@ -166,7 +166,6 @@ namespace NzbDrone.Common.Test
         [TestCase(@"\\server\share\test", @"\\server\share")]
         public void path_should_return_parent_name_windows(string path, string parentPath)
         {
-            WindowsOnly();
             path.GetParentName().Should().Be(parentPath);
         }
 
@@ -175,7 +174,6 @@ namespace NzbDrone.Common.Test
         [TestCase(@"/test/tv", "test")]
         public void path_should_return_parent_name_mono(string path, string parentPath)
         {
-            PosixOnly();
             path.GetParentName().Should().Be(parentPath);
         }
 
@@ -190,6 +188,7 @@ namespace NzbDrone.Common.Test
             path.GetDirectoryName().Should().Be(parentPath);
         }
 
+        [TestCase(@"/", "/")]
         [TestCase(@"/test", "test")]
         [TestCase(@"/test/tv", "tv")]
         public void path_should_return_directory_name_mono(string path, string parentPath)

src/NzbDrone.Common/Disk/OsPath.cs

@@ -10,7 +10,7 @@ namespace NzbDrone.Common.Disk
         private readonly string _path;
         private readonly OsPathKind _kind;
 
-        private static readonly Regex UncPathRegex = new Regex(@"^\\\\(?:\?\\UNC\\)?[^\\]+\\[^\\]+(?:\\|$)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+        private static readonly Regex UncPathRegex = new Regex(@"(?<unc>^\\\\(?:\?\\UNC\\)?[^\\]+\\[^\\]+)(?:\\|$)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
 
         public OsPath(string path)
         {
@@ -22,7 +22,7 @@ namespace NzbDrone.Common.Disk
             else
             {
                 _kind = DetectPathKind(path);
-                _path = TrimTrailingSlashes(FixSlashes(path, _kind), _kind);
+                _path = FixSlashes(path, _kind);
             }
         }
 
@@ -36,7 +36,7 @@ namespace NzbDrone.Common.Disk
             else
             {
                 _kind = kind;
-                _path = TrimTrailingSlashes(FixSlashes(path, kind), kind);
+                _path = FixSlashes(path, kind);
             }
         }
 
@@ -99,7 +99,7 @@ namespace NzbDrone.Common.Disk
             return path;
         }
 
-        private static string TrimTrailingSlashes(string path, OsPathKind kind)
+        private static string TrimTrailingSlash(string path, OsPathKind kind)
         {
             switch (kind)
             {
@@ -156,7 +156,7 @@ namespace NzbDrone.Common.Disk
                     return Null;
                 }
 
-                if (rootLength > index)
+                if (rootLength > index + 1)
                 {
                     return new OsPath(_path.Substring(0, rootLength));
                 }
@@ -167,6 +167,8 @@ namespace NzbDrone.Common.Disk
 
         public string FullPath => _path;
 
+        public string PathWithoutTrailingSlash => TrimTrailingSlash(_path, _kind);
+
         public string FileName
         {
             get
@@ -189,6 +191,30 @@ namespace NzbDrone.Common.Disk
             }
         }
 
+        public string Name
+        {
+            // Meant to behave similar to DirectoryInfo.Name
+
+            get
+            {
+                var index = GetFileNameIndex();
+
+                if (index == -1)
+                {
+                    return PathWithoutTrailingSlash;
+                }
+
+                var rootLength = GetRootLength();
+
+                if (rootLength > index + 1)
+                {
+                    return _path.Substring(0, rootLength);
+                }
+
+                return TrimTrailingSlash(_path.Substring(index).TrimStart('/', '\\'), _kind);
+            }
+        }
+
         public bool IsValid => _path.IsPathValid(PathValidationType.CurrentOs);
 
         private int GetFileNameIndex()
@@ -242,7 +268,7 @@ namespace NzbDrone.Common.Disk
                 // \\?\UNC\server\share\ or \\server\share
                 if (uncMatch.Success)
                 {
-                    return uncMatch.Length;
+                    return uncMatch.Groups["unc"].Length;
                 }
 
                 // \\?\C:\
@@ -345,8 +371,8 @@ namespace NzbDrone.Common.Disk
                 return true;
             }
 
-            var left = _path;
-            var right = other._path;
+            var left = PathWithoutTrailingSlash;
+            var right = other.PathWithoutTrailingSlash;
 
             if (Kind == OsPathKind.Windows || other.Kind == OsPathKind.Windows)
             {

src/NzbDrone.Common/Extensions/PathExtensions.cs

@@ -99,35 +99,23 @@ namespace NzbDrone.Common.Extensions
                 return null;
             }
 
-            var path = new OsPath(cleanPath).Directory.AsDirectory();
+            var path = new OsPath(cleanPath).Directory;
 
-            return path == OsPath.Null ? null : path.FullPath;
+            return path == OsPath.Null ? null : path.PathWithoutTrailingSlash;
         }
 
         public static string GetParentName(this string childPath)
         {
-            var cleanPath = childPath.GetCleanPath();
+            var path = new OsPath(childPath).Directory;
 
-            if (cleanPath.IsNullOrWhiteSpace())
-            {
-                return null;
-            }
-
-            return Directory.GetParent(cleanPath)?.Name;
+            return path == OsPath.Null ? null : path.Name;
         }
 
         public static string GetDirectoryName(this string childPath)
         {
-            var cleanPath = childPath.GetCleanPath();
+            var path = new OsPath(childPath);
 
-            if (cleanPath.IsNullOrWhiteSpace())
-            {
-                return null;
-            }
-
-            var directoryInfo = new DirectoryInfo(cleanPath);
-
-            return directoryInfo.Name;
+            return path == OsPath.Null ? null : path.Name;
         }
 
         public static string GetCleanPath(this string path)