#! /bin/csh -f

#
# getformat_from_stem - determines format from a stem by appending
# various format extensions and checking whether the file exists.
# For this reason, the actual format returned will depend upon
# whether the sequences of formats tried if multiple formats for 
# the same stem are present.
#
# Return: format extension and exit 0. If fails, then exits 1.
#
# As a convenience, you can spec the format to try as the 2nd arg.
# If the stem.fmt does not exist, then exit 1. Otherwise exit 0
# and echoes the given fmt to the terminal. This just helps to
# cut out a few lines of code from the calling program.
#
# Original Author: Doug Greve
# CVS Revision Info:
#    $Author: nicks $
#    $Date: 2007/01/09 22:41:17 $
#    $Revision: 1.3 $
#
# Copyright (C) 2002-2007,
# The General Hospital Corporation (Boston, MA). 
# All rights reserved.
#
# Distribution, usage and copying of this software is covered under the
# terms found in the License Agreement file named 'COPYING' found in the
# FreeSurfer source code root directory, and duplicated here:
# https://surfer.nmr.mgh.harvard.edu/fswiki/FreeSurferOpenSourceLicense
#
# General inquiries: freesurfer@nmr.mgh.harvard.edu
# Bug reports: analysis-bugs@nmr.mgh.harvard.edu
#


if($#argv < 1 || $#argv > 2) then
  echo "getformat_from_stem stem <fmt>"
  exit 1;
endif

set stem = $argv[1];

if($#argv == 2) then
  # Format has been specified
  set fmt = $argv[2];
else
  # Format has been not specified
  set fmt = ();
endif

if($#fmt) then
  # Format has been specified, check that file exists
  if(! -e $stem.$fmt) then
    echo "ERROR: cannot find $stem.$fmt"
    exit 1;
  endif
  echo $fmt
  exit 0;
endif

# Only gets here when autodetecting

if(-e $stem.nii.gz) then
  echo nii.gz
  exit 0
endif

if(-e $stem.nii) then
  echo nii
  exit 0
endif

if(-e $stem.mgh) then
  echo mgh
  exit 0
endif

if(-e $stem.mgz) then
  echo mgz
  exit 0
endif

if(-e $stem.bhdr) then
  echo bhdr
  exit 0
endif

if(-e $stem.img) then
  echo img
  exit 0
endif

echo "ERROR: cannot determine format for stem $stem"

exit 1

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