using System;
using System.IO;
using System.Linq;


namespace RobvanderWoude
{
	internal class Trim
	{
		static readonly string progver = "1.00";


		static int Main( string[] args )
		{
			int argumentscount = args.Length;
			if ( Console.IsInputRedirected )
			{
				argumentscount++;
			}
			if ( argumentscount != 1 || args.Contains( "/?" ) )
			{
				return ShowHelp( );
			}

			string input = string.Empty;
			if ( Console.IsInputRedirected )
			{
				input = Console.In.ReadToEnd( );
			}
			else if ( File.Exists( args[0] ) )
			{
				input = File.ReadAllText( args[0] );
			}
			else
			{
				input = args[0];
			}
			string output = input.Trim( );
			Console.Write( output );
			return 0;
		}


		public static int ShowHelp( string errorMessage = "" )
		{
			#region Help Text

			/*
			Trim,  Version 1.00
			Trim leading and trailing whitespace (including linefeeds) from string
 
			Usage:  TRIM  textfile
 
			   or:  TRIM  text
 
			   or:  some_program | TRIM
 
			Where:  textfile      file containing text to be trimmed
			        text          string to be trimmed
			        some_program  program whose output is to be trimmed
 
			Note:   Exit code ("errorlevel") -1 in case of errors, otherwise 0.
	
			Written by Rob van der Woude
			https://www.robvanderwoude.com
			*/

			#endregion Help Text


			#region Error Message

			if ( !string.IsNullOrWhiteSpace( errorMessage ) )
			{
				Console.Error.WriteLine( );
				Console.ForegroundColor = ConsoleColor.Red;
				Console.Error.Write( "ERROR: " );
				Console.ForegroundColor = ConsoleColor.White;
				Console.Error.WriteLine( errorMessage );
				Console.ResetColor( );
			}

			#endregion Error Message


			#region Display Help

			Console.Error.WriteLine( );

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

			Console.Error.WriteLine( "Trim leading and trailing whitespace (including linefeeds) from string" );

			Console.Error.WriteLine( );

			Console.Error.Write( "Usage:  " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "TRIM  textfile" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "   or:  " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "TRIM  text" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "   or:  " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "some_program | TRIM" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "Where:  " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "textfile" );
			Console.ResetColor( );
			Console.Error.WriteLine( "      file containing text to be trimmed" );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "        text" );
			Console.ResetColor( );
			Console.Error.WriteLine( "          string to be trimmed" );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "        some_program" );
			Console.ResetColor( );
			Console.Error.WriteLine( "  program whose output is to be trimmed" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Note:   Exit code (\"errorlevel\") -1 in case of errors, otherwise 0." );

			Console.Error.WriteLine( );

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

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

			#endregion Display Help


			return -1;
		}
	}
}