/*
 	STPipe

	Created by Stilianos Louca on 11/25/08	
	Last modified on 2011.09.05
 	
 	Class for piping to shell.
 
 	Namespace ST
 */

#ifndef ST_PIPE
#define ST_PIPE

#include <stdarg.h>
#include <stdio.h>
#include <string>
#include <sstream>
#include <algorithm>
using namespace std;

namespace ST{

#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__TOS_WIN__)
	#define PIPE_WRITE_MODE "w"
	#define PIPE_APPENDIX ""
#elif defined(__APPLE__)
	#define PIPE_WRITE_MODE "r+"
	#define PIPE_APPENDIX " 2>&1"
#elif defined(unix) || defined(__unix) || defined(__unix__)
	#define PIPE_WRITE_MODE "w"
	#define PIPE_APPENDIX " 2> /dev/null"
#else
	#define PIPE_WRITE_MODE "w"
	#define PIPE_APPENDIX ""
#endif

class STPipe{
private:
	FILE 	*fout;					// pointer to pipe. Will be NULL if pipe is not open
	bool	requirePipe; 			// if true, failing to write to pipe returns an error. Otherwise, it's just silently accepted.
	string	commandUsedToOpenPipe;	// if pipe is open, it will have been opened using this exact command
	
protected:
	ostream *logStream;				// output everything also to this stream. This is not allocated (opened) by STPipe, but by whoever told STPipe to use it
	
	//implement vsprintf-like output for ostreams
	void vstreamprintf(ostream &streamOut, const char *format, va_list arg);
	
public:
	STPipe();
	STPipe(ostream *logStream);
	STPipe(string &command); 
	STPipe(string &command, ostream *logStream);
	STPipe(const string &command, const string &directory);
	STPipe(const string &command, const string &directory, ostream *logStream);
	~STPipe();
	
	//copy constructor
	STPipe(const STPipe &original);
	
	//assignment operator
	STPipe &operator=(const STPipe &original);

		
	void setLogStream(ostream *logStream);
	void setRequirePipe(bool require);
	
	void open(const string &command);
	void open(const char *command);
	bool isOpen() const;
	void close();

	virtual bool write(const char *format, va_list args);
	virtual bool write(const char *format, ...);
	virtual bool write(const string &message);
	bool pipeIsReady() const;
	
};


//returns path to program (analogous to 'which' command)
//Uses system's lookup tables, and does not guarantee file actually exists under the given path
bool getProgramPath(const string &name, string &path);

bool getCommandOutput(const string &command, bool suppressErrors, string &output);



}//END OF NAMESPACE ST

#endif