Source code for isredirected.cs

using System;

using System.Collections.Generic;

namespace RobvanderWoude

{

	class IsRedirected

	{

		static string progver = "1.02";

		static int Main( string[] args )

		{

			int checkinput = 0;

			int checkoutput = 0;

			int checkerror = 0;

			int rc = 0;

			if ( Console.IsInputRedirected )

			{

				checkinput = 2;

			}

			if ( Console.IsOutputRedirected )

			{

				checkoutput = 4;

			}

			if ( Console.IsErrorRedirected )

			{

				checkerror = 8;

			}

			switch ( args.Length )

			{

				case 0:

					rc = checkinput + checkoutput + checkerror;

					break;

				case 1:

					switch ( args[0].ToLower( ) )

					{

						case "/i":

						case "-i":

							rc = checkinput;

							break;

						case "/o":

						case "-o":

							rc = checkoutput;

							break;

						case "/e":

						case "-e":

							rc = checkerror;

							break;

						case "/v":

						case "-v":

							Console.WriteLine( );

							Console.WriteLine( "Standard Input  redirection detected: {0}", ( Console.IsInputRedirected ? "Yes    +2" : "No     +0" ) );

							Console.WriteLine( "Standard Output redirection detected: {0}", ( Console.IsOutputRedirected ? "Yes    +4" : "No     +0" ) );

							Console.WriteLine( "Standard Error  redirection detected: {0}", ( Console.IsErrorRedirected ? "Yes    +8" : "No     +0" ) );

							Console.WriteLine( );

							rc = checkinput + checkoutput + checkerror;

							Console.WriteLine( "                         Return Code:        {0,2}", rc );

							break;

						case "/?":

						case "-?":

						case "/h":

						case "-h":

						case "/help":

						case "-help":

						case "--help":

							return ShowHelp( );

						default:

							return ShowHelp( "Invalid command line argument" );

					}

					break;

				default:

					return ShowHelp( "Invalid command line arguments" );

			}

			// Pass through any redirected StdIn

			if ( Console.IsInputRedirected )

			{

				string input = Console.In.ReadToEnd( );

				Console.Write( input );

			}

			return rc;

		}

		static int ShowHelp( params string[] errmsg )

		{

			#region Error Message

			if ( errmsg.Length > 0 )

			{

				List<string> errargs = new List<string>( errmsg );

				errargs.RemoveAt( 0 );

				Console.Error.WriteLine( );

				Console.ForegroundColor = ConsoleColor.Red;

				Console.Error.Write( "ERROR:\t" );

				Console.ForegroundColor = ConsoleColor.White;

				Console.Error.WriteLine( errmsg[0], errargs.ToArray( ) );

				Console.ResetColor( );

			}

			#endregion Error Message

			#region Help Text

			/*

			IsRedirected,  Version 1.02

			Test redirection of Standard Input, Standard Output and Standard Error

			Usage:  ISREDIRECTED  [ /E | /I | /O | /V ]

			Where:  /E   returns result for Standard Error  redirection only (default: all)

			        /I   returns result for Standard Input  redirection only

			        /O   returns result for Standard Output redirection only

			        /V   Verbose mode: show detected redirections on screen

			Notes:  The test result is returned as "errorlevel", where no redirection = 0,

			        command line error = 1, Standard Input redirection = +2, Standard

			        Output redirection = +4, and Standard Error redirection = +8.

			        Redirected Standard Input is passed on unaltered to this program's

			        Standard Output.

			        This version of the program requires .NET Framework 4.5.

			Written by Rob van der Woude

			http://www.robvanderwoude.com

			*/

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "IsRedirected,  Version {0}", progver );

			Console.Error.WriteLine( "Test redirection of Standard Input, Standard Output and Standard Error" );

			Console.Error.WriteLine( );

			Console.Error.Write( "Usage:  " );

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.WriteLine( "ISREDIRECTED  [ /E | /I | /O | /V ]" );

			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "Where:  " );

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "/E" );

			Console.ResetColor( );

			Console.Error.Write( "   returns result for Standard " );

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "E" );

			Console.ResetColor( );

			Console.Error.WriteLine( "rror  redirection only" );

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "        /I" );

			Console.ResetColor( );

			Console.Error.Write( "   returns result for Standard " );

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "I" );

			Console.ResetColor( );

			Console.Error.WriteLine( "nput  redirection only (default: all)" );

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "        /O" );

			Console.ResetColor( );

			Console.Error.Write( "   returns result for Standard " );

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "O" );

			Console.ResetColor( );

			Console.Error.WriteLine( "utput redirection only" );

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "        /V   V" );

			Console.ResetColor( );

			Console.Error.WriteLine( "erbose mode: show detected redirections on screen" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Notes:  The test result is returned as \"errorlevel\", where no redirection = 0," );

			Console.Error.WriteLine( "        command line error = 1, Standard Input redirection = +2, Standard" );

			Console.Error.WriteLine( "        Output redirection = +4, and Standard Error redirection = +8." );

			Console.Error.WriteLine( "        Redirected Standard Input is passed on unaltered to this program's" );

			Console.Error.WriteLine( "        Standard Output." );

			Console.Error.WriteLine( "        This version of the program requires .NET Framework 4.5." );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Written by Rob van der Woude" );

			Console.Error.WriteLine( "http://www.robvanderwoude.com" );

			#endregion Help Text

			return 1;

		}

	}

}