Add cs.pp extension to C#

lib/linguist/languages.yml

@@ -746,6 +746,7 @@ C#:
   extensions:
   - ".cs"
   - ".cake"
+  - ".cs.pp"
   - ".csx"
   - ".linq"
   language_id: 42

samples/C#/_CodeSugarIO.DriveInfo.cs.pp

@@ -0,0 +1,92 @@
+// Copyright (c) CodeSugar 2024 Vicente Penades
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+using System.Runtime.CompilerServices;
+
+#nullable disable
+
+using FILE = System.IO.FileInfo;
+using DIRECTORY = System.IO.DirectoryInfo;
+using SYSTEMENTRY = System.IO.FileSystemInfo;
+
+#if CODESUGAR_USECODESUGARNAMESPACE
+namespace CodeSugar
+#elif CODESUGAR_USESYSTEMNAMESPACE
+namespace System.IO
+#else
+namespace $rootnamespace$
+#endif
+{
+    static partial class CodeSugarForSystemIO    
+    {
+        /// <summary>
+        /// Tries to get the DriveInfo from a given system file object.
+        /// </summary>
+        /// <remarks>
+        /// <para>
+        /// it will fail if the path points to a network drive, as in: <c>\\NetworkDevice\path\</c>
+        /// </para>
+        /// <para>
+        /// This only works on Windows.
+        /// </para>
+        /// </remarks>
+        public static bool TryGetDriveInfo(this System.IO.DirectoryInfo dinfo, out System.IO.DriveInfo drive)
+        {
+            drive = null;
+
+            if (dinfo == null) return false;
+            var root = dinfo.Root.GetNormalizedFullName();            
+
+            if (string.IsNullOrWhiteSpace(root)) return false;
+            if (root.Length < 2) return false;            
+
+            // network drive
+
+            if (root[0] == System.IO.Path.DirectorySeparatorChar && root[1] == System.IO.Path.DirectorySeparatorChar) return false;                            
+
+            // system drive
+
+            var interned = _TryGetInternedDriveInfo(root);
+            if (interned != null) { drive = interned; return true; }
+
+            drive = new System.IO.DriveInfo(root);                
+            return true;
+        }
+
+        /// <summary>
+        /// Gets the drive or network name of the given object.
+        /// </summary>
+        public static string GetDriveOrNetworkName(this System.IO.DirectoryInfo dinfo)
+        {
+            if (dinfo == null) return null;
+            var root = dinfo.Root.GetNormalizedFullName();
+
+            var interned = _TryGetInternedDriveInfo(root);
+            if (interned != null) return interned.Name;
+
+            return root;            
+        }
+
+        // this is a helper method that allows reusing tha same System.IO.DriveInfo instanced mapped to System Drives.
+        private static System.IO.DriveInfo _TryGetInternedDriveInfo(string root)
+        {
+            if (_InternedFixedDrives == null) // initialize
+            {
+                _InternedFixedDrives = new Dictionary<string,System.IO.DriveInfo>(FileSystemStringComparer);
+
+                foreach(var d in System.IO.DriveInfo.GetDrives())
+                {
+                    if (!d.IsReady) continue;
+
+                    if (d.DriveType != System.IO.DriveType.Fixed) continue;                                    
+                    _InternedFixedDrives[d.Name] = d;
+                }
+            }
+
+            return _InternedFixedDrives.TryGetValue(root, out var drive) ? drive : null;            
+        }        
+    }
+}