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diff --git a/src/tclap/ZshCompletionOutput.h b/src/tclap/ZshCompletionOutput.h
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+// -*- Mode: c++; c-basic-offset: 4; tab-width: 4; -*-
+
+/****************************************************************************** 
+ * 
+ *  file:  ZshCompletionOutput.h
+ * 
+ *  Copyright (c) 2006, Oliver Kiddle
+ *  All rights reverved.
+ * 
+ *  See the file COPYING in the top directory of this distribution for
+ *  more information.
+ *  
+ *  THE SOFTWARE IS PROVIDED _AS IS_, WITHOUT WARRANTY OF ANY KIND, EXPRESS 
+ *  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
+ *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
+ *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
+ *  DEALINGS IN THE SOFTWARE.
+ *  
+ *****************************************************************************/ 
+
+#ifndef TCLAP_ZSHCOMPLETIONOUTPUT_H
+#define TCLAP_ZSHCOMPLETIONOUTPUT_H
+
+#include <string>
+#include <vector>
+#include <list>
+#include <iostream>
+#include <map>
+
+#include <tclap/CmdLineInterface.h>
+#include <tclap/CmdLineOutput.h>
+#include <tclap/XorHandler.h>
+#include <tclap/Arg.h>
+
+namespace TCLAP {
+
+/**
+ * A class that generates a Zsh completion function as output from the usage()
+ * method for the given CmdLine and its Args.
+ */
+class ZshCompletionOutput : public CmdLineOutput
+{
+
+	public:
+
+		ZshCompletionOutput();
+
+		/**
+		 * Prints the usage to stdout.  Can be overridden to 
+		 * produce alternative behavior.
+		 * \param c - The CmdLine object the output is generated for. 
+		 */
+		virtual void usage(CmdLineInterface& c);
+
+		/**
+		 * Prints the version to stdout. Can be overridden 
+		 * to produce alternative behavior.
+		 * \param c - The CmdLine object the output is generated for. 
+		 */
+		virtual void version(CmdLineInterface& c);
+
+		/**
+		 * Prints (to stderr) an error message, short usage 
+		 * Can be overridden to produce alternative behavior.
+		 * \param c - The CmdLine object the output is generated for. 
+		 * \param e - The ArgException that caused the failure. 
+		 */
+		virtual void failure(CmdLineInterface& c,
+						     ArgException& e );
+
+	protected:
+
+		void basename( std::string& s );
+		void quoteSpecialChars( std::string& s );
+
+		std::string getMutexList( CmdLineInterface& _cmd, Arg* a );
+		void printOption( Arg* it, std::string mutex );
+		void printArg( Arg* it );
+
+		std::map<std::string, std::string> common;
+		char theDelimiter;
+};
+
+ZshCompletionOutput::ZshCompletionOutput()
+{
+	common["host"] = "_hosts";
+	common["hostname"] = "_hosts";
+	common["file"] = "_files";
+	common["filename"] = "_files";
+	common["user"] = "_users";
+	common["username"] = "_users";
+	common["directory"] = "_directories";
+	common["path"] = "_directories";
+	common["url"] = "_urls";
+}
+
+inline void ZshCompletionOutput::version(CmdLineInterface& _cmd)
+{
+	std::cout << _cmd.getVersion() << std::endl;
+}
+
+inline void ZshCompletionOutput::usage(CmdLineInterface& _cmd )
+{
+	std::list<Arg*> argList = _cmd.getArgList();
+	std::string progName = _cmd.getProgramName();
+	std::string version = _cmd.getVersion();
+	theDelimiter = _cmd.getDelimiter();
+	basename(progName);
+
+	std::cout << "#compdef " << progName << std::endl << std::endl <<
+		"# " << progName << " version " << _cmd.getVersion() << std::endl << std::endl <<
+		"_arguments -s -S";
+
+	for (ArgListIterator it = argList.begin(); it != argList.end(); it++)
+	{
+		if ( (*it)->shortID().at(0) == '<' )
+			printArg((*it));
+		else if ( (*it)->getFlag() != "-" )
+			printOption((*it), getMutexList(_cmd, *it));
+	}
+
+	std::cout << std::endl;
+}
+
+inline void ZshCompletionOutput::failure( CmdLineInterface& _cmd,
+				                ArgException& e )
+{
+	static_cast<void>(_cmd); // unused
+	std::cout << e.what() << std::endl;
+}
+
+inline void ZshCompletionOutput::quoteSpecialChars( std::string& s )
+{
+	size_t idx = s.find_last_of(':');
+	while ( idx != std::string::npos )
+	{
+		s.insert(idx, 1, '\\');
+		idx = s.find_last_of(':', idx);
+	}
+	idx = s.find_last_of('\'');
+	while ( idx != std::string::npos )
+	{
+		s.insert(idx, "'\\'");
+		if (idx == 0)
+			idx = std::string::npos;
+		else
+			idx = s.find_last_of('\'', --idx);
+	}
+}
+
+inline void ZshCompletionOutput::basename( std::string& s )
+{
+	size_t p = s.find_last_of('/');
+	if ( p != std::string::npos )
+	{
+		s.erase(0, p + 1);
+	}
+}
+
+inline void ZshCompletionOutput::printArg(Arg* a)
+{
+	static int count = 1;
+
+	std::cout << " \\" << std::endl << "  '";
+	if ( a->acceptsMultipleValues() )
+		std::cout << '*';
+	else
+		std::cout << count++;
+	std::cout << ':';
+	if ( !a->isRequired() )
+		std::cout << ':';
+
+	std::cout << a->getName() << ':';
+	std::map<std::string, std::string>::iterator compArg = common.find(a->getName());
+	if ( compArg != common.end() )
+	{
+		std::cout << compArg->second;
+	}
+	else
+	{
+		std::cout << "_guard \"^-*\" " << a->getName();
+	}
+	std::cout << '\'';
+}
+
+inline void ZshCompletionOutput::printOption(Arg* a, std::string mutex)
+{
+	std::string flag = a->flagStartChar() + a->getFlag();
+	std::string name = a->nameStartString() + a->getName();
+	std::string desc = a->getDescription();
+
+	// remove full stop and capitalisation from description as
+	// this is the convention for zsh function
+	if (!desc.compare(0, 12, "(required)  "))
+	{
+		desc.erase(0, 12);
+	}
+	if (!desc.compare(0, 15, "(OR required)  "))
+	{
+		desc.erase(0, 15);
+	}
+	size_t len = desc.length();
+	if (len && desc.at(--len) == '.')
+	{
+		desc.erase(len);
+	}
+	if (len)
+	{
+		desc.replace(0, 1, 1, tolower(desc.at(0)));
+	}
+
+	std::cout << " \\" << std::endl << "  '" << mutex;
+
+	if ( a->getFlag().empty() )
+	{
+		std::cout << name;
+	}
+	else
+	{
+		std::cout << "'{" << flag << ',' << name << "}'";
+	}
+	if ( theDelimiter == '=' && a->isValueRequired() )
+		std::cout << "=-";
+	quoteSpecialChars(desc);
+	std::cout << '[' << desc << ']';
+
+	if ( a->isValueRequired() )
+	{
+		std::string arg = a->shortID();
+		arg.erase(0, arg.find_last_of(theDelimiter) + 1);
+		if ( arg.at(arg.length()-1) == ']' )
+			arg.erase(arg.length()-1);
+		if ( arg.at(arg.length()-1) == ']' )
+		{
+			arg.erase(arg.length()-1);
+		}
+		if ( arg.at(0) == '<' )
+		{
+			arg.erase(arg.length()-1);
+			arg.erase(0, 1);
+		}
+		size_t p = arg.find('|');
+		if ( p != std::string::npos )
+		{
+			do
+			{
+				arg.replace(p, 1, 1, ' ');
+			}
+			while ( (p = arg.find_first_of('|', p)) != std::string::npos );
+			quoteSpecialChars(arg);
+			std::cout << ": :(" << arg << ')';
+		}
+		else
+		{
+			std::cout << ':' << arg;
+			std::map<std::string, std::string>::iterator compArg = common.find(arg);
+			if ( compArg != common.end() )
+			{
+				std::cout << ':' << compArg->second;
+			}
+		}
+	}
+
+	std::cout << '\'';
+}
+
+inline std::string ZshCompletionOutput::getMutexList( CmdLineInterface& _cmd, Arg* a)
+{
+	XorHandler xorHandler = _cmd.getXorHandler();
+	std::vector< std::vector<Arg*> > xorList = xorHandler.getXorList();
+	
+	if (a->getName() == "help" || a->getName() == "version")
+	{
+		return "(-)";
+	}
+
+	std::ostringstream list;
+	if ( a->acceptsMultipleValues() )
+	{
+		list << '*';
+	}
+
+	for ( int i = 0; static_cast<unsigned int>(i) < xorList.size(); i++ )
+	{
+		for ( ArgVectorIterator it = xorList[i].begin();
+			it != xorList[i].end();
+			it++)
+		if ( a == (*it) )
+		{
+			list << '(';
+			for ( ArgVectorIterator iu = xorList[i].begin();
+				iu != xorList[i].end();
+				iu++ )
+			{
+				bool notCur = (*iu) != a;
+				bool hasFlag = !(*iu)->getFlag().empty();
+				if ( iu != xorList[i].begin() && (notCur || hasFlag) )
+					list << ' ';
+				if (hasFlag)
+					list << (*iu)->flagStartChar() << (*iu)->getFlag() << ' ';
+				if ( notCur || hasFlag )
+					list << (*iu)->nameStartString() << (*iu)->getName();
+			}
+			list << ')';
+			return list.str();
+		}
+	}
+	
+	// wasn't found in xor list
+	if (!a->getFlag().empty()) {
+		list << "(" << a->flagStartChar() << a->getFlag() << ' ' <<
+			a->nameStartString() << a->getName() << ')';
+	}
+	
+	return list.str();
+}
+
+} //namespace TCLAP
+#endif