Add support for file overwriting in shell

Assets/Scripts/OS/FileSystems/Host/HostDirectoryEntry.cs

@@ -76,7 +76,7 @@ namespace OS.FileSystems.Host
 		{
 			string fullPath = Path.Combine(hostPath, name);
 			if (!File.Exists(fullPath))
-				File.Create(fullPath);
+				File.Create(fullPath).Dispose();
 
 			entry = new HostFileEntry(this, fullPath);
 			return true;

Assets/Scripts/OS/FileSystems/VirtualFileSystem.cs

@@ -86,7 +86,7 @@ namespace OS.FileSystems
 			return currentEntry;
 		}
 
-		private IFileEntry? FindFileEntry(ReadOnlySpan<string> path, IUser? reader = null)
+		private IFileEntry? FindFileEntry(ReadOnlySpan<string> path, IUser? reader = null, bool create = false)
 		{
 			reader ??= this.user;
 			
@@ -105,7 +105,10 @@ namespace OS.FileSystems
 				if (fileEntry.Name == filename)
 					return fileEntry;
 			}
-			
+
+			if (create && parentDirectory.TryCreateFile(reader, filename, out IFileEntry? newFile) && newFile != null)
+				return newFile;
+
 			return null;
 		}
 
@@ -178,7 +181,7 @@ namespace OS.FileSystems
 		public Stream OpenWrite(string path)
 		{
 			string[] parts = PathUtility.Split(path);
-			IFileEntry? file = FindFileEntry(parts);
+			IFileEntry? file = FindFileEntry(parts, create: true);
 
 			if (file == null)
 				throw new FileNotFoundException();

Assets/Scripts/UI/Shell/FileOutputConsole.cs

@@ -0,0 +1,50 @@
+#nullable enable
+using System;
+using System.IO;
+using OS.Devices;
+
+namespace UI.Shell
+{
+	public class FileOutputConsole : 
+		ITextConsole,
+		IDisposable
+	{
+		private readonly ITextConsole input;
+		private readonly Stream fileStream;
+		private readonly StreamWriter fileWriter;
+
+		public FileOutputConsole(ITextConsole input, Stream output)
+		{
+			this.input = input;
+			this.fileStream = output;
+
+			this.fileWriter = new StreamWriter(fileStream);
+		}
+		
+		public void Dispose()
+		{
+			fileWriter.Dispose();
+			fileStream.Dispose();
+		}
+
+		/// <inheritdoc />
+		public void ClearScreen()
+		{
+			fileWriter.Flush();
+			fileStream.Position = 0;
+			fileStream.SetLength(0);
+		}
+
+		/// <inheritdoc />
+		public void WriteText(string text)
+		{
+			fileWriter.Write(text);
+		}
+
+		/// <inheritdoc />
+		public bool TryDequeueSubmittedInput(out string input)
+		{
+			return this.input.TryDequeueSubmittedInput(out input);
+		}
+	}
+}

Assets/Scripts/UI/Shell/FileOutputConsole.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 9a4a394e1f59409ca8bd9be2c65f373f
+timeCreated: 1677107497

Assets/Scripts/UI/Shell/ICommandShell.cs

@@ -5,5 +5,8 @@ namespace UI.Shell
 	{
 		string GetVariableValue(string name);
 		void SetVariableValue(string name, string newValue);
+		
+		string CurrentWorkingDirectory { get; }
+		string CurrentHomeDirectory { get; }
 	}
 }

Assets/Scripts/UI/Shell/InteractiveShell.cs

@@ -34,6 +34,13 @@ namespace UI.Shell
 		/// <inheritdoc />
 		public bool IsExecutionHalted => false;
 
+		/// <inheritdoc />
+		public string CurrentWorkingDirectory => process?.WorkingDirectory ?? "/";
+		
+		/// <inheritdoc />
+		public string CurrentHomeDirectory => process?.User?.Home ?? "/";
+		
+		
 		public InteractiveShell(MonoBehaviour unityBehaviour)
 		{
 			this.unityBehaviour = unityBehaviour;
@@ -487,6 +494,11 @@ namespace UI.Shell
 			public IArgumentEvaluator[] ArgumentList { get; }
 			public FileRedirectionType RedirectionType { get; }
 			public string FilePath { get; }
+
+			public string FullFilePath
+			{
+				get => PathUtility.Combine(shell.CurrentWorkingDirectory, FilePath);
+			}
 			
 			public CommandData(InteractiveShell shell,string name, IEnumerable<IArgumentEvaluator> argumentSource, FileRedirectionType redirectionType, string path)
 			{
@@ -534,23 +546,51 @@ namespace UI.Shell
 				// Evaluate arguments now.
 				string[] args = ArgumentList.Select(x => x.GetArgumentText(this.shell)).ToArray();
 				
-				// TODO: File redirection. Should be easy.
-				
-				if (shell.ProcessBuiltIn(shellProcess, console, Name, args))
+				// Get the vfs
+				var vfs = shellProcess.User.Computer.GetFileSystem(shellProcess.User);
+
+				// What console are we going to send to the command?
+				ITextConsole realConsole = console;
+
+				switch (this.RedirectionType)
+				{
+					case FileRedirectionType.Overwrite:
+						realConsole = new FileOutputConsole(console, vfs.OpenWrite(this.FullFilePath));
+						break;
+				}
+
+				if (shell.ProcessBuiltIn(shellProcess, realConsole, Name, args))
+				{
+					if (realConsole is IDisposable disposable)
+						disposable.Dispose();
 					return null;
+				}
 
 				// Process text arguments to make sure we remove their trailing spaces
 				ShellUtility.TrimTrailingSpaces(ref args);
 
-				ISystemProcess? commandProcess = FindProgram(shellProcess, console, Name, args);
+				ISystemProcess? commandProcess = FindProgram(shellProcess, realConsole, Name, args);
 				if (commandProcess == null)
 					console.WriteText($"sh: {Name}: command not found" + Environment.NewLine);
 				
 				// special case for commands that kill the process IMMEDIATELY
 				// on the same frame this was called
 				if (commandProcess != null && !commandProcess.IsAlive)
+				{
+					if (realConsole is IDisposable disposable)
+						disposable.Dispose();
 					return null;
+				}
+
+				void handleKilled(ISystemProcess proc)
+				{
+					if (realConsole is IDisposable disposable)
+						disposable.Dispose();
+					proc.Killed -= handleKilled;
+				}
 				
+				if (commandProcess != null)
+					commandProcess.Killed += handleKilled;
 				return commandProcess;
 			}
 		}

UserSettings/Layouts/CurrentMaximizeLayout.dwlt

@@ -24,7 +24,7 @@ MonoBehaviour:
   m_MinSize: {x: 300, y: 200}
   m_MaxSize: {x: 24288, y: 16192}
   vertical: 0
-  controlID: 5913
+  controlID: 7072
 --- !u!114 &2
 MonoBehaviour:
   m_ObjectHideFlags: 52
@@ -141,7 +141,7 @@ MonoBehaviour:
   m_MinSize: {x: 200, y: 200}
   m_MaxSize: {x: 16192, y: 16192}
   vertical: 1
-  controlID: 5914
+  controlID: 7073
 --- !u!114 &4
 MonoBehaviour:
   m_ObjectHideFlags: 52
@@ -166,7 +166,7 @@ MonoBehaviour:
   m_MinSize: {x: 200, y: 100}
   m_MaxSize: {x: 16192, y: 8096}
   vertical: 0
-  controlID: 5915
+  controlID: 7074
 --- !u!114 &5
 MonoBehaviour:
   m_ObjectHideFlags: 52
@@ -226,7 +226,7 @@ MonoBehaviour:
       scrollPos: {x: 0, y: 0}
       m_SelectedIDs: 
       m_LastClickedID: 0
-      m_ExpandedIDs: 30fbffff
+      m_ExpandedIDs: b0c7fefffcc7feff40c9feff50c9feff5cc9feff80c9feffdce2feff28e3feff6ce4feff7ce4feff88e4fefface4feff20ecfeff6cecfeffb0edfeffc0edfeffccedfefff0edfeff30fbffff
       m_RenameOverlay:
         m_UserAcceptedRename: 0
         m_Name: