// -*- C++ -*-
/**
 * \file helper_funcs.h
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author Angus Leeming
 *
 * Full author contact details are available in file CREDITS
 */

#ifndef HELPERFUNCS_H
#define HELPERFUNCS_H

#ifdef __GNUG__
#pragma interface
#endif

#include "LString.h"

#include <utility> // pair
#include <vector> // pair

class LyXView;

/** Launch a file dialog and return the chosen file.
    filename: a suggested filename.
    title: the title of the dialog.
    pattern: *.ps etc.
    dir1 = (name, dir), dir2 = (name, dir): extra buttons on the dialog.
*/
string const
browseFile(LyXView *lv, string const & filename,
	   string const & title,
	   string const & pattern,
	   std::pair<string,string> const & dir1 =
	   std::make_pair(string(), string()),
	   std::pair<string,string> const & dir2 =
	   std::make_pair(string(), string()));


/* Wrapper around browseFile which tries to provide a filename
   relative to relpath.  If the relative path is of the form "foo.txt"
   or "bar/foo.txt", then it is returned as relative. OTOH, if it is
   of the form "../baz/foo.txt", an absolute path is returned. This is
   intended to be useful for insets which encapsulate files/
*/
string const
browseRelFile(LyXView *lv, string const & filename,
	      string const & refpath,
	      string const & title,
	      string const & pattern,
	      std::pair<string,string> const & dir1 =
	      std::make_pair(string(), string()),
	      std::pair<string,string> const & dir2 =
	      std::make_pair(string(), string()));


/// Returns a vector of units that can be used to create a valid LaTeX length.
std::vector<string> const getLatexUnits();


/** Functions to extract vectors of the first and second elems from a
    vector<pair<A,B> >
*/

namespace detail {

template<class Pair>
struct firster {
	typedef typename Pair::first_type first_type;
	first_type const & operator()(Pair const & p) { return p.first; }
};

template<class Pair>
struct seconder {
	typedef typename Pair::second_type second_type;
	second_type const & operator()(Pair const & p) { return p.second; }
};

} // namespace detail

///
template<class Pair>
std::vector<typename Pair::first_type> const
getFirst(std::vector<Pair> const & pr)
{
	std::vector<typename Pair::first_type> tmp(pr.size());
	std::transform(pr.begin(), pr.end(), tmp.begin(),
		       detail::firster<Pair>());
	return tmp;
}

///
template<class Pair>
std::vector<typename Pair::second_type> const
getSecond(std::vector<Pair> const & pr)
{
	std::vector<typename Pair::second_type> tmp(pr.size());
	std::transform(pr.begin(), pr.end(), tmp.begin(),
		       detail::seconder<Pair>());
	return tmp;
}


#endif // HELPERFUNCS_H