Source code for odt2txt.cs

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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.IO.Compression;
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using System.Text;
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using System.Text.RegularExpressions;
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namespace RobvanderWoude
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{
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	internal class ODT2Txt
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	{
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		static string progver = "1.00";
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		static int Main( string[] args )
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		{
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			string odtfile = string.Empty;
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			Encoding encoding = null;
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			bool usexmlencoding = false;
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			#region Parse Command Line
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			if ( args.Length == 0 || args.Length > 2 )

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			{
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				return ShowHelp( );
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			}
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			foreach ( string arg in args )
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			{
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				if ( arg[0] == '/' )
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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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					else if ( arg.ToUpper( ).StartsWith( "/D", StringComparison.OrdinalIgnoreCase ) )

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					{
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						usexmlencoding = true;
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					}
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					else if ( arg.ToUpper( ) == "/E" )
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					{
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						return ListEncodings( );
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					}
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					else
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					{
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						return ShowHelp( "Invalid command line switch {0}", arg );

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					}
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				}
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				else
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				{
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					if ( string.IsNullOrWhiteSpace( odtfile ) )

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					{
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						odtfile = arg;
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						if ( !File.Exists( odtfile ) )
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						{
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							return ShowHelp( "File \"{0}\" not found", odtfile );

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						}
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						if ( Path.GetExtension( odtfile ).ToLower( ) != ".odt" )

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						{
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							return ShowHelp( "This program can extract text from .ODT files only" );

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						}
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					}
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					else if ( encoding == null )
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					{
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						encoding = GetEncoding( arg );
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						if ( encoding == null )
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						{
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							return ShowHelp( "Invalid encoding \"{0}\"", args[1] );

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						}
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					}
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					else
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					{
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						return ShowHelp( "Too many command line arguments" );

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					}
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				}
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			}
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			if ( string.IsNullOrWhiteSpace( odtfile ) )

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			{
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				return ShowHelp( );
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			}
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			#endregion Parse Command Line
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			#region Extract Text
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			string tempfile = Path.GetTempFileName( );

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			string content = string.Empty;
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			bool success = false;
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			using ( ZipArchive archive = ZipFile.OpenRead( odtfile ) )

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			{
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				foreach ( ZipArchiveEntry entry in archive.Entries )

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				{
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					if ( entry.Name.ToLower( ) == "content.xml" )

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					{
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						entry.ExtractToFile( tempfile, true );

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						success = true;
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					}
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				}
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			}
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			if ( success )
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			{
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				StreamReader sr = new StreamReader( tempfile );

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				content = sr.ReadToEnd( );
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				sr.Close( );
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			}
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			File.Delete( tempfile );
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			#endregion Extract Text
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			if ( success )
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			{
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				// The first 100 characters of the extracted XML usually contain its encoding;

				// this encoding will be used if the /D command line switch was used

				Regex regex = new Regex( " encoding=\"([^\"]+)\"" );

				string xmlencoding = regex.Match( content, 0, 100 ).Groups[1].Value;

```
 
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				#region Cleanup Text
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				// insert newlines after header, paragraph or list-item

				regex = new Regex( "</text:(h|list-item|p)>" );

				string plaintext = regex.Replace( content, "\n\n" );

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				// remove all XML tags
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				regex = new Regex( "<[^>]+>" );
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				plaintext = regex.Replace( plaintext, "" );

				// reduce maximum number of censecutive newlines to two

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				regex = new Regex( "\n{3,}" );
```

				plaintext = regex.Replace( plaintext, "\n\n" );

				// convert stray carriage returns to carriage return/linefeed pairs

				plaintext = ConvertStrayCarriageReturns( plaintext ).Trim( "\n\r\t ".ToCharArray( ) );

```
 
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				#endregion Cleanup Text
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				#region Display Text
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				if ( usexmlencoding )
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				{
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					encoding = GetEncoding( xmlencoding );

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				}
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				if ( encoding == null )
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				{
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					// send text to console using default output encoding

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					Console.WriteLine( plaintext );
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				}
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				else
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				{
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					// temporarily change output encoding and send text to console

					Encoding oldencoding = Console.OutputEncoding;

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					Console.OutputEncoding = encoding;
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					Console.WriteLine( plaintext );
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					Console.OutputEncoding = oldencoding;

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				}
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				#endregion Display Text
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				return 0;
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			}
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			return ShowHelp( "An error occurred while trying to read \"{0}\"", odtfile );

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		}
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		static string ConvertStrayCarriageReturns( string text )

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		{
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			// convert stray carriage returns to carriage return/linefeed pairs

			// search for stray carriage returns (\r), i.e. the ones NOT followed by linefeeds (\n)

			Regex regex = new Regex( "\r(?!\n)" );

			// replace each matching stray carriage return by a carriage return/linefeed pair

			text = regex.Replace( text, Environment.NewLine );

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			return text;
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		}
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		static Encoding GetEncoding( string myencoding )

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		{
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			if ( string.IsNullOrEmpty( myencoding ) )

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			{
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				return null;
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			}
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			// Get a list of available encodings
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			EncodingInfo[] encodings = Encoding.GetEncodings( );

			// Try correctly spelled encodings first

			foreach ( EncodingInfo encoding in encodings )

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			{
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				if ( encoding.Name.ToLower( ) == myencoding.ToLower( ) )

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				{
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					return Encoding.GetEncoding( encoding.CodePage );

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				}
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			}
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			// No direct match found, try again, ignoring dashes

			foreach ( EncodingInfo encoding in encodings )

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			{
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				if ( encoding.Name.Replace( "-", "" ).ToLower( ) == myencoding.Replace( "-", "" ).ToLower( ) )

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				{
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					return Encoding.GetEncoding( encoding.CodePage );

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				}
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			}
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			// Still no match, try codepages
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			foreach ( EncodingInfo encoding in encodings )

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			{
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				if ( encoding.CodePage.ToString( ) == myencoding )

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				{
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					return Encoding.GetEncoding( encoding.CodePage );

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				}
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			}
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			// Still no match, giving up
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			return null;
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		}
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		static int ListEncodings( )
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		{
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			try
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			{
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				Console.Clear( );
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			}
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			catch
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			{
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				// Console.Clear( ) throws an IO exception if the output is redirected

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			}
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			int columnwidth = 8;
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			EncodingInfo[] allencodings = Encoding.GetEncodings( );

			List<string> allencodingnames = new List<string>( );

			foreach ( EncodingInfo enc in allencodings )

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			{
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				allencodingnames.Add( enc.Name );
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			}
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			allencodingnames.Sort( );
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			foreach ( string enc in allencodingnames )

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			{
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				columnwidth = Math.Max( columnwidth, enc.Length );

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			}
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			Console.WriteLine( "{0,-" + columnwidth + "}   {1}", "Encoding", "CodePage" );

			Console.WriteLine( "{0,-" + columnwidth + "}   {1}", "========", "========" );

			foreach ( string enc in allencodingnames )

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			{
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				Console.WriteLine( "{0,-" + columnwidth + "}   {1}", enc, GetEncoding( enc ).CodePage );

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			}
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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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			/*
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```
			ODT2Txt.exe,  Version 1.00
```

			Return plain text content of an OpenOffice file without requiring OpenOffice

```
 
```

			Usage:    ODT2Txt.exe  odtfile  [ encoding | /D ]

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```
```
			or:       ODT2Txt.exe  /E
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```

			Where:    odtfile      is the path of the OpenOffice file to be read

			                       (no wildcards, only .odt extension allowed)

			          encoding     is the output encoding, e.g. UTF-8 to preserve

			                       Unicode characters, or IBM437 to convert Unicode

			                       doublequotes to ASCII

			          /D           use the encoding specified in the document file

			          /E           list all available encodings

```
 
```

			Notes:    If the specified encoding does not match any available encoding

			          name, the program will try again, ignoring dashes; if that does

			          not provide a match, the program will try matching the specified

			          encoding with the available encodings' codepages.

			          This program requires .NET 4.5.

			          Return code ("errorlevel") 1 in case of errors, 0 on success.

```
 
```
```
			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( "ODT2Txt.exe,  Version {0}", progver );

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			Console.Error.WriteLine( "Return plain text content of an OpenOffice file without requiring OpenOffice" );

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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( "ODT2Txt.exe  odtfile  [ encoding | /D ]" );

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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( "ODT2Txt.exe  /E" );

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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( "odtfile" );
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			Console.ResetColor( );
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			Console.Error.WriteLine( "      is the path of the OpenOffice file to be read" );

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			Console.Error.WriteLine( "                       (no wildcards, only .odt extension allowed)" );

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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "          encoding" );

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			Console.ResetColor( );
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			Console.Error.Write( "     is the output encoding, e.g. " );

			Console.ForegroundColor = ConsoleColor.White;

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			Console.Error.Write( "UTF-8" );
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			Console.ResetColor( );
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			Console.Error.WriteLine( " to preserve" );

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			Console.Error.Write( "                       Unicode characters, or " );

			Console.ForegroundColor = ConsoleColor.White;

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			Console.Error.Write( "IBM437" );
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			Console.ResetColor( );
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			Console.Error.WriteLine( " to convert Unicode" );

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			Console.Error.WriteLine( "                       doublequotes to ASCII" );

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			Console.ForegroundColor = ConsoleColor.White;

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

```
			Console.ResetColor( );
```

			Console.Error.WriteLine( "            use the encoding specified in the document file" );

```
 
```

			Console.ForegroundColor = ConsoleColor.White;

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

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			Console.ResetColor( );
```

			Console.Error.WriteLine( "            list all available encodings" );

```
 
```
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			Console.Error.WriteLine( );
```
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			Console.Error.WriteLine( "Notes:   If the specified encoding does not match any available encoding" );

```
 
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			Console.Error.WriteLine( "         name, the program will try again, ignoring dashes; if that does" );

```
 
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			Console.Error.WriteLine( "         not provide a match, the program will try matching the specified" );

```
 
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			Console.Error.WriteLine( "         encoding with the available encodings' codepages." );

```
 
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			Console.Error.WriteLine( "         This program requires .NET 4.5." );

```
 
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			Console.Error.WriteLine( "         Return code (\"errorlevel\") 1 in case of errors, 0 on success." );

```
 
```
```
			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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```
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```
			return 1;
```
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		}
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	}
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}
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```