#!/bin/sh
#       -->  Name: mvdir
#       -->  Desc: Move directories across file systems
#       -->  Args: $1 -> src dir
#       -->        $2 -> dest dir
#
PATH=/bin:/usr/bin ; export PATH
#       -->  function to print errors and exit
printERROR() { echo "ERROR: $@." >&2 ; exit 1; }
#       -->  function to print usage message and exit
printUSAGE() { echo "USAGE: `/bin/basename $0` $@." >&2 ; exit 1; }
#       -->  check if sufficient args are given
if [ $#       -->  -lt 2 ] ; then printUSAGE "[src] [dest]" ; fi
#       -->  check if the source directory exists
if [ ! -d "$1" ] ; then
    printERROR "The source $1 is not a directory, or does not exist"
fi
#       -->  split up the source dir into its name and its parents name for
#       -->  easier processing later on
SRCDIR_PARENT="`/usr/bin/dirname $1`"
SRCDIR_CHILD="`/bin/basename $1`"
#       -->  if dirname returns a relative dir we will be confused after cd'ing
#       -->  latter on. So reset it to the full path.
SRCDIR_PARENT="`(cd $SRCDIR_PARENT ; pwd ; )`"
#       -->  initalize the destination directory
DESTDIR="$2"; 
#       -->  check if the destination exits
if [ ! -d "$DESTDIR" ] ; then
    #       -->  if the destination doesn't exist then assume the destination is
    #       -->  the new name for the directory
    DESTDIR="`/usr/bin/dirname $2`"
    NEWNAME="`/bin/basename $2`"
fi
#       -->  if dirname returns a relative dir we will be confused after cd'ing
#       -->  latter on. So reset it to the full path.
DESTDIR=`(cd $DESTDIR ; pwd ; )`
#       -->  if the parent of the destination doesn't exist,
#       -->  were in trouble. Tell the user and exit.
if [ ! -d "$DESTDIR" ] ; then
    printERROR "A parent of the destination directory $2 does not exist"
fi
#       -->  try and cd to the parent src directory
cd "$SRCDIR_PARENT" > /dev/null 2>&1
if [ $? -ne 0 ] ; then
    printERROR "Could not cd to $SRCDIR_PARENT"
fi
#       -->  use tar to copy the source dir to the destination
/bin/tar -cvpf - "$SRCDIR_CHILD" | ( cd "$DESTDIR" ; /bin/tar -xvpf - )
if [ $? -ne 0 ] ; then
    printERROR "Unable to sucessfully move $1 to $2"
fi
#       -->  if a rename of the copy is requested
if [ -n "$NEWNAME" ] ; then
    #       -->  try and change to the destination directory 
    cd "$DESTDIR" > /dev/null 2>&1
    if [ $? -ne 0 ] ; then
	printERROR "Could not cd to $DESTDIR"
    fi
    #       -->  try and rename the copy
    /bin/mv "$SRCDIR_CHILD" "$NEWNAME" > /dev/null 2>&1
    if [ $? -ne 0 ] ; then
	printERROR "Could not rename $1 to $2"
    fi
    #       -->  return to the original directory
    cd "$SRCDIR_PARENT" > /dev/null 2>&1
    if [ $? -ne 0 ] ; then
	printERROR "Could not cd to $SRCDIR_PARENT"
    fi
fi
#       -->  try and remove the original
if [ -d "$SRCDIR_CHILD" ] ; then 
    /bin/rm -r "$SRCDIR_CHILD" > /dev/null 2>&1
    if [ $? -ne 0 ] ; then
	printERROR "Could not remove $1"
    fi
fi
exit 0