## Copyright (C) 2005 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 2, 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, write to the Free
## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
## 02110-1301, USA.

## -*- texinfo -*-
## @deftypefn {Function File} {[@var{status}, @var{msg}, @var{msgid}] =} copyfile (@var{f1}, @var{f2}, @var{force})
## 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 @var{force} is given and equals
## the string "f" the copy operation will be forced.
##
## If successful, @var{status} is 1, with @var{msg} and @var{msgid} empty\n\
## character strings.  Otherwise, @var{status} is 0, @var{msg} contains a\n\
## system-dependent error message, and @var{msgid} contains a unique\n\
## message identifier.\n\
## @seealso{glob, 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 (EXEC_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 = strcat (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);
    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 (EXEC_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 (EXEC_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
