usage() {
  echo "Usage : ./install.sh <flag>"
  echo ""
  echo "Where <flag> is one of the following"
  echo ""
  echo "  --full            : Do a full install"
  echo "  --system          : Install into system"
  echo ""
  echo "greetings from -=<yb4f310 ..."
}

cleanup() {

  LAST_ERROR=$?

  if [ "${LAST_ERROR}" = 1 ] ;
  then
    usage
  fi
}

trap cleanup EXIT

FLAG=$1
BIN_INSTALL_PATH=/usr/local/bin/r3
COMPLETION_INSTALL_PATH=/etc/bash_completion.d/r3-completion.bash

if [ "${FLAG}" != '--full' ] && \
   [ "${FLAG}" != '--system' ];
then
  exit 1;
fi



if [ "${FLAG}" = '--full' ] || [ "${FLAG}" = '--system' ];
then

  echo "installing r3.sh into system"

  echo "updating r3.sh"
  sed -i "/^R3_INSTALL_PATH=/s/R3_INSTALL_PATH\=.*/R3_INSTALL_PATH=$(printf %q $(pwd) | sed -E 's/([+,/,@])/\\\1/g')/" r3.sh

  echo "updating r3-completion.bash"
  sed -i "/^R3_INSTALL_PATH=/s/R3_INSTALL_PATH\=.*/R3_INSTALL_PATH=$(printf %q $(pwd) | sed -E 's/([+,/,@])/\\\1/g')/" r3-completion.bash

  echo "r3 install path set to ${PWD}"

  if [ -L "${BIN_INSTALL_PATH}" ] ;
  then
    echo "r3 was already installed to ${BIN_INSTALL_PATH}"
  else
    echo "r3 was not found at ${BIN_INSTALL_PATH} - installing now"
    sudo ln -s "${PWD}/"r3.sh "${BIN_INSTALL_PATH}"
    echo "successfully installed r3 at ${BIN_INSTALL_PATH}"
  fi


  if [ -L "${COMPLETION_INSTALL_PATH}" ] ;
  then
    echo "r3-completion.bash was already installed to ${COMPLETION_INSTALL_PATH}"
  else
    echo "r3-completion.bash was not found at ${COMPLETION_INSTALL_PATH} - installing now"
    sudo ln -s "${PWD}/"r3-completion.bash "${COMPLETION_INSTALL_PATH}"
    echo "successfully installed r3-completion.bash at ${COMPLETION_INSTALL_PATH}"
  fi

  if [ "${FLAG}" = '--system' ] ;
  then
    exit 0
  fi

fi