## Copyright (C) 2005-2012 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/>.

## -*- texinfo -*-
## @deftypefn  {Function File} {[@var{status}, @var{msg}, @var{msgid}] =} copyfile (@var{f1}, @var{f2})
## @deftypefnx {Function File} {[@var{status}, @var{msg}, @var{msgid}] =} copyfile (@var{f1}, @var{f2}, 'f')
## Copy the file @var{f1} to the new name @var{f2}.  The name @var{f1}
## may contain globbing patterns.  If @var{f1} expands to multiple file
## names, @var{f2} must be a directory.  If the force flag 'f' is given then
## existing destination files will be overwritten without prompting.
##
## If successful, @var{status} is 1, with @var{msg} and @var{msgid} empty
## character strings.  Otherwise, @var{status} is 0, @var{msg} contains a
## system-dependent error message, and @var{msgid} contains a unique
## message identifier.
## @seealso{movefile}
## @end deftypefn

function [status, msg, msgid] = copyfile (f1, f2, force)

  max_cmd_line = 1024;
  status = true;
  msg = "";
  msgid = "";

  ## FIXME -- maybe use the same method as in ls to allow users control
  ## over the command that is executed.

  if (ispc () && ! isunix ()
      && isempty (file_in_path (getenv ("PATH"), "cp.exe")))
    ## Windows.
    cmd = "cmd /C xcopy /E";
    cmd_force_flag = "/Y";
  else
    cmd = "cp -r";
    cmd_force_flag = "-f";
  endif

  if (nargin == 2 || nargin == 3)
    ## Input type check.
    if (! (ischar (f1) || iscellstr (f1)))
      error ("copyfile: first argument must be a character string or a cell array of character strings");
    endif

    if (! ischar (f2))
      error ("copyfile: second argument must be a character string");
    endif

    if (nargin == 3 && strcmp (force, "f"))
      cmd = cstrcat (cmd, " ", cmd_force_flag);
    endif

    ## If f1 isn't a cellstr convert it to one.
    if (ischar (f1))
      f1 = cellstr (f1);
    endif

    ## If f1 has more than 1 element f2 must be a directory
    isdir = (exist (f2, "dir") != 0);
    if (length (f1) > 1 && ! isdir)
      error ("copyfile: when copying multiple files, second argument must be a directory");
    endif

    ## Protect the file name(s).
    f1 = glob (f1);
    if (isempty (f1))
      error ("copyfile: no files to move");
    endif
    p1 = sprintf ("\"%s\" ", f1{:});
    p2 = tilde_expand (f2);

    if (isdir && length (p1) > max_cmd_line)
      l2 = length (p2) + length (cmd) + 6;
      while (! isempty (f1))
        p1 = sprintf ("\"%s\" ", f1{1});
        f1(1) = [];
        while (!isempty (f1) && (length (p1) + length (f1{1}) + l2 <
                                 max_cmd_line))
          p1 = sprintf ("%s\"%s\" ", p1, f1{1});
          f1(1) = [];
        endwhile

        if (ispc () && ! isunix ()
            && ! isempty (file_in_path (getenv ("PATH"), "cp.exe")))
          p1 = strrep (p1, "\\", "/");
          p2 = strrep (p2, "\\", "/");
        endif

        ## Copy the files.
        [err, msg] = system (sprintf ("%s %s\"%s\"", cmd, p1, p2));
        if (err < 0)
          status = false;
          msgid = "copyfile";
          break;
        endif
      endwhile
    else
      if (ispc () && ! isunix ()
          && ! isempty (file_in_path (getenv ("PATH"), "cp.exe")))
        p1 = strrep (p1, "\\", "/");
        p2 = strrep (p2, "\\", "/");
      endif

      ## Copy the files.
      [err, msg] = system (sprintf ("%s %s\"%s\"", cmd, p1, p2));
      if (err < 0)
        status = false;
        msgid = "copyfile";
      endif
    endif
  else
    print_usage ();
  endif

endfunction