拆分代码4

shell/Commands/FileSystem/HeadCommand.cs

@@ -0,0 +1,53 @@
+using System;
+
+namespace CMLeonOS.Commands.FileSystem
+{
+    public static class HeadCommand
+    {
+        public static void HeadFile(CMLeonOS.FileSystem fileSystem, string args, Action<string> showError)
+        {
+            if (string.IsNullOrEmpty(args))
+            {
+                showError("Please specify a file name");
+                return;
+            }
+            
+            try
+            {
+                string[] parts = args.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
+                string fileName = parts[0];
+                int lineCount = 10;
+                
+                if (parts.Length > 1)
+                {
+                    if (int.TryParse(parts[1], out int count))
+                    {
+                        lineCount = count;
+                    }
+                }
+                
+                string content = fileSystem.ReadFile(fileName);
+                if (string.IsNullOrEmpty(content))
+                {
+                    Console.WriteLine("File is empty");
+                    return;
+                }
+                
+                string[] lines = content.Split(new string[] { "\r\n", "\n" }, StringSplitOptions.None);
+                int displayLines = Math.Min(lineCount, lines.Length);
+                
+                Console.WriteLine($"First {displayLines} lines of {fileName}:");
+                Console.WriteLine("--------------------------------");
+                
+                for (int i = 0; i < displayLines; i++)
+                {
+                    Console.WriteLine($"{i + 1}: {lines[i]}");
+                }
+            }
+            catch (Exception ex)
+            {
+                showError($"Error reading file: {ex.Message}");
+            }
+        }
+    }
+}