Source code for progressbar.cs

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using System;
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using System.Collections.Generic;
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namespace RobvanderWoude
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{
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	internal class ProgressBar
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	{
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		static readonly string progver = "1.00";

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		static int Main( string[] args )
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		{
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			int currentvalue = -1;
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			int maximumvalue = -1;
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			ConsoleColor bgcolor = ConsoleColor.Green;

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			#region Parse Command Line
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			if ( args.Length < 1 || args.Length > 3 )

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			{
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				return ShowHelp( );
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			}
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			int numcolors = 0;
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			foreach ( string arg in args )
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			{
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				if ( arg == "/?" )
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				{
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					return ShowHelp( );
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				}
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				if ( arg.ToUpper( ) == "/C" )
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				{
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					// /C should be the only argument
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					if ( args.Length != 1 )
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					{
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						return ShowHelp( );
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					}
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					// Determine required column width
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					int columnwidt = 0;
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					foreach ( ConsoleColor color in Enum.GetValues( typeof( ConsoleColor ) ) )

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					{
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						columnwidt = Math.Max( columnwidt, Enum.GetName( typeof( ConsoleColor ), color ).Length );

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					}
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					// Display valid colors
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					Console.WriteLine( "Valid colors:" );

					Console.WriteLine( "=============" );

					foreach ( ConsoleColor color in Enum.GetValues( typeof( ConsoleColor ) ) )

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					{
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						Console.ForegroundColor = color;
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						// Prvent "invisible" text when foreground color equals background color

						if ( Console.ForegroundColor == Console.BackgroundColor )

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						{
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							Console.BackgroundColor = (ConsoleColor)( ( (int)color + 7 ) % 16 );

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						}
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						Console.WriteLine( "{0,-" + columnwidt + "}\t{1,2}", Enum.GetName( typeof( ConsoleColor ), color ), (int)color );

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						Console.ResetColor( );
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					}
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					return 0;
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				}
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				else if ( int.TryParse( arg, out int test ) )

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				{
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					if ( currentvalue == -1 && test >= 0 ) // First numeric value is the current value

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					{
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						currentvalue = test;
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					}
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					else if ( maximumvalue == -1 && test > 0 ) // Second numeric value is the maximum value

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					{
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						maximumvalue = test;
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					}
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					else if ( test > -1 && test < 16 ) // Third numeric value could be the color

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					{
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						if ( numcolors > 0 )
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							return ShowHelp( "Duplicate color argument \"{0}\"", arg );

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						}
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						bgcolor = (ConsoleColor)test;
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						numcolors++;
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					}
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					else // No more numeric values allowed

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					{
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						return ShowHelp( "Invalid command line argument \"{0}\"", arg );

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					}
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				}
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				else
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				{
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					bool validcolor = false;
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					foreach ( ConsoleColor color in Enum.GetValues( typeof( ConsoleColor ) ) )

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						if ( arg.ToUpper( ) == Enum.GetName( typeof( ConsoleColor ), color ).ToUpper( ) )

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						{
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							if ( numcolors > 0 )
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							{
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								return ShowHelp( "Duplicate color argument \"{0}\"", arg );

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							}
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							bgcolor = color;
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							validcolor = true;
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							numcolors++;
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						}
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					}
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					if ( !validcolor )
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					{
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						return ShowHelp( "Invalid color \"{0}\", use /C switch to show valid colors", arg );

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					}
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				}
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			}
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			#endregion Parse Command Line
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			#region Validate Command Line
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			if ( maximumvalue == -1 )
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			{
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				maximumvalue = Console.WindowWidth;
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			}
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			if ( currentvalue == maximumvalue + 1 )

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			{
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				currentvalue = maximumvalue;
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			}
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			else if ( currentvalue < 0 || currentvalue > maximumvalue + 1 )

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			{
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				return ShowHelp( "Invalid current value \"{0}\"", currentvalue.ToString( ) );

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			}
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			#endregion Validate Command Line
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			// Move down 1 line and then return to the current one, to make sure we're not at the bottom line of the screen

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			Console.WriteLine( );
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			int linenumber = Console.CursorTop - 1;

			Console.SetCursorPosition( 0, linenumber );

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			// Calculate progress bar length
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			double progress = Math.Min( 1F, (double)currentvalue / (double)maximumvalue );

			int progressbarlength = (int)( progress * (double)( Console.WindowWidth ) );

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			// Display the calculated progress bar

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			Console.BackgroundColor = bgcolor;
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			string progressbar = new string( ' ', progressbarlength );

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			Console.Write( progressbar );
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			Console.ResetColor( );
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			Console.Write( new string( ' ', Console.WindowWidth - progressbarlength ) );

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			// Move the cursor back to the start of the line

			Console.SetCursorPosition( 0, linenumber );

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			return 0;
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		}
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		static int ShowHelp( params string[] errmsg )

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		{
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			#region Error Message
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			if ( errmsg.Length > 0 )
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			{
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				List<string> errargs = new List<string>( errmsg );

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				errargs.RemoveAt( 0 );
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				Console.Error.WriteLine( );
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				Console.ForegroundColor = ConsoleColor.Red;

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				Console.Error.Write( "ERROR:\t" );
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				Console.ForegroundColor = ConsoleColor.White;

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

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				Console.ResetColor( );
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			}
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			#endregion Error Message
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			#region Help Text
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			/*
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			ProgressBar.exe,  Version 1.00
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			Batch tool to display a progress bar
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			Usage:    ProgressBar   current  [ maximum ]  [ color ]

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			or:       ProgressBar   /C
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			Where:    current       is the current value

			          maximum       is the maximum value (default: console width)

			          color         is the progress bar color, either by name or

			                        by number (default: Green)

			          /C            list valid colors by name and number

```
 
```

			Notes:    The program writes a progress bar, the length of which is determined

			          by the formula: current / maximum * console width

			          Return code -1 in case of (command line) errors, otherwise 0.

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```
			Written by Rob van der Woude
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			https://www.robvanderwoude.com
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			*/
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			#endregion Help Text
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			#region Display Help Text
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			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "ProgressBar.exe,  Version {0}", progver );

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			Console.Error.WriteLine( "Batch tool to display a progress bar" );

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

			Console.Error.WriteLine( "ProgressBar   current  [ maximum ]  [ color ]" );

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

			Console.Error.WriteLine( "ProgressBar   /C" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( );
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			Console.Error.Write( "Where:    " );
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			Console.ForegroundColor = ConsoleColor.White;

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			Console.Error.Write( "current" );
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			Console.ResetColor( );
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			Console.Error.WriteLine( "       is the current value" );

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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "          maximum" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( "       is the maximum value (default: console width)" );

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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "          color" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( "         is the progress bar color, either by name or" );

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			Console.Error.WriteLine( "                        by number (default: Green)" );

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			Console.ForegroundColor = ConsoleColor.White;

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

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			Console.ResetColor( );
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			Console.Error.WriteLine( "            list valid colors by name and number" );

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			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "Notes:    The program writes a progress bar, the length of which is determined" );

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			Console.Error.WriteLine( "          by the formula: current / maximum * console width" );

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			Console.Error.WriteLine( "          Return code -1 in case of (command line) errors, otherwise 0." );

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

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

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			#endregion Display Help Text
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			return -1;
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		}
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	}
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}
```