## Copyright (C) 2005-2015 Søren Hauberg
## Copyright (C) 2010 VZLU Prague, a.s.
##
## 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/>.

## -*- texinfo -*-
## @deftypefn {} {@var{pkg} =} extract_pkg (@var{nm}, @var{pat})
## Undocumented internal function.
## @end deftypefn

function pkg = extract_pkg (nm, pat)
  fid = fopen (nm, "rt");
  pkg = "";
  if (fid >= 0)
    while (! feof (fid))
      ln = fgetl (fid);
      if (ln > 0)
        t = regexp (ln, pat, "tokens");
        if (! isempty (t))
          pkg = [pkg "\n" t{1}{1}];
        endif
      endif
    endwhile
    if (! isempty (pkg))
      pkg = [pkg "\n"];
    endif
    fclose (fid);
  endif
endfunction