#! /bin/sh

case $# in
  1)
    if [ -d $1 ] ; then
      prefix=$1
    else
      echo "$1: not a directory (specify GraphViz installation directory)"
      exit 1
    fi
    ;;
  *)
    prefix=$(dirname $(dirname $0))
    if [ ! -x $prefix/bin/dot ] ; then
      echo "specify your GraphViz installation directory, please"
      exit 0
    fi
    ;;
esac


if [ -x ${prefix}/bin/dot ] ; then
# GraphViz is already installed at $prefix
  dotmsg=$(${prefix}/bin/dot -V 2>&1)
  if echo $dotmsg | grep "^dyld: .*can't open library: " > /dev/null ; then
    olddir=$(echo $dotmsg | sed -e "s/^dyld: .*can't open library: \(.*\)\/lib\/graphviz\/.* (No such file.*$/\1/")
  else
    echo GraphViz seems OK: $dotmsg
    exit
  fi
  installdir=$prefix
else
# GraphViz not yet installed
  installdir=.
  if [ ! -x $installdir/bin/dot ] ; then
    echo "GraphViz not present in $prefix, and also not in $(pwd); bailing out"
    exit
  fi
  olddir=/Local/Users/js/pkg/graphviz-1.10
fi

echo "adapting GraphViz installation to run from $prefix (was: $olddir)"
libdir=$prefix/lib/graphviz

for arg in $installdir/bin/* $installdir/lib/graphviz/*.dylib ; do
  case $arg in
  *.dylib)
    id=$(otool -l $arg | grep ' name ' | grep $olddir | awk '{print $2}')
    if [ -n "${id}" ] ; then
      id=$(basename $(otool -l $arg | grep ' name ' | grep $olddir | awk '{print $2}'))
      install_name_tool -id $libdir/$id $arg
    fi
    ;;
  *)
    libs=`otool -L $arg | grep $olddir | awk '{print $1}'`
    for lib in $libs; do
      case $lib in
        ${olddir}/*)
          install_name_tool -change $lib $libdir/`basename $lib` $arg
          ;;
	*)
          ;;
      esac
    done
    ;;
  esac
done