/*

Copyright (C) 2010-2015 John W. Eaton

This file is part of Octave.

Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <algorithm>
#include <string>

#include <fnmatch.h>
#include <glob.h>

#include "oct-glob.h"
#include "file-stat.h"

// These functions are defined here and not in glob_match.cc so that we
// can include the glob.h file from gnulib, which defines glob to
// be rpl_glob.  If we include glob.h in glob_match.cc, then it
// transforms the glob_match::glob function to be glob_match::rpl_glob,
// which is not what we want...

static bool
single_match_exists (const std::string& file)
{
  octave::sys::file_stat s (file);

  return s.exists ();
}

namespace octave
{
  namespace sys
  {
    bool
    fnmatch (const string_vector& pat, const std::string& str, int fnm_flags)
    {
      int npat = pat.numel ();

      const char *cstr = str.c_str ();

      for (int i = 0; i < npat; i++)
        if (::fnmatch (pat(i).c_str (), cstr, fnm_flags) != FNM_NOMATCH)
          return true;

      return false;
    }

    string_vector
    glob (const string_vector& pat)
    {
      string_vector retval;

      int npat = pat.numel ();

      int k = 0;

      for (int i = 0; i < npat; i++)
        {
          std::string xpat = pat(i);

          if (! xpat.empty ())
            {
              glob_t glob_info;

#if (defined (OCTAVE_HAVE_WINDOWS_FILESYSTEM) \
     && ! defined (OCTAVE_HAVE_POSIX_FILESYSTEM))
              std::replace_if (xpat.begin (), xpat.end (),
                               std::bind2nd (std::equal_to<char> (), '\\'),
                               '/');
#endif

              int err = gnulib::glob (xpat.c_str (), GLOB_NOSORT, 0, &glob_info);

              if (! err)
                {
                  int n = glob_info.gl_pathc;

                  const char * const *matches = glob_info.gl_pathv;

                  // FIXME: we shouldn't have to check to see if
                  // a single match exists, but it seems that glob() won't
                  // check for us unless the pattern contains globbing
                  // characters.  Hmm.

                  if (n > 1
                      || (n == 1
                          && single_match_exists (std::string (matches[0]))))
                    {
                      retval.resize (k+n);

                      for (int j = 0; j < n; j++)
                        {
                          std::string tmp = matches[j];

#if defined (OCTAVE_HAVE_WINDOWS_FILESYSTEM)    \
  && ! defined (OCTAVE_HAVE_POSIX_FILESYSTEM)
                          std::replace_if (tmp.begin (), tmp.end (),
                                           std::bind2nd (std::equal_to<char> (),
                                                         '/'),
                                           '\\');
#endif

                          retval[k++] = tmp;
                        }
                    }

                  gnulib::globfree (&glob_info);
                }
            }
        }

      return retval.sort ();
    }
  }
}