#!/bin/sh

# Copyright 2012-2019 Edward W. Koenig, Vancouver, WA, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# nvidia-switch utility 4.5
#
# A tool to install and cleanly remove the nvidia driver without stomping on the xorg files.
# Note: this tool "should" allow switching on the fly, but why? Pick a driver! You will still
# need to edit a bunch of other config files.

# TO-DO: needs more cleanup, simplify linking using system tools, add 15.0 fixes

ROOT="${ROOT:-/}"
CWD=$(pwd)
COMPAT32="LIB32FLAG" # This will be replaced in the build script (yes | no)
LIBSUFFIX="LIBDIRSUFFIX" # This will be replaced in the build script
INC="${ROOT}usr/include/GL"
LIB="${ROOT}usr/lib${LIBSUFFIX}"
LIB32="${ROOT}usr/lib"
XMOD="${LIB}/xorg/modules"
XLIB="$XMOD/extensions"
NV_VERSION="PKGVERSION" # This will be replaced in the build script
GL_VERSION="1.2.0"
GLVND="yes" # This will be replaced in the build script (yes | no)


save_GL(){
# backup original mesa and xorg conflicts ##to /var/log/nvidia
  cd $2
  case "$1" in
    "nvidia")
      mv libGL.la libGL.la-xorg
      mv libGL.la-nvidia libGL.la
    ;;

    "xorg")
       mv libGL.la libGL.la-nvidia
       mv libGL.la-xorg libGL.la
  ;;

  *)
        echo "nothing to do for save_gl?"
        exit 1
  ;;
  esac
  cd "$CWD"
}

nvidia_install(){
  if [ ! -d $SAVELIBS ]; then
     echo "Creating missing $SAVELIB ..."
     mkdir -p $SAVELIBS
  fi
  echo $'Installing to nvidia-driver files!\n'
  echo "Make sure the nvidia driver is ENABLED in /etc/X11/xorg.conf"
  echo "and in /etc/X11/xorg.conf.d."
  echo "Otherwise, this may lead to improperly working drivers."

  save_GL "nvidia" $LIB
  
# Check for multilib configuration
  if [ "$COMPAT32" = "yes" ]; then
    save_GL "nvidia" $LIB32
  fi
}

nvidia_remove(){
  echo $'Returning to stock xorg files!\n'
  echo "Make sure the nvidia driver is DISABLED in /usr/share/X11/xorg.conf.d"
  echo "/etc/X11/xorg.conf and in /etc/X11/xorg.conf.d."
  echo "Otherwise, this may lead to improperly working drivers."

  save_GL "xorg" $LIB
# Check for multilib configuration
  if [ "$COMPAT32" = "yes" ]; then
    save_GL "xorg" $LIB32
  fi

  if [ -e $NV_CONF ]; then
    echo "You will need to remove/save $NV_CONF from nvidia-driver to use"
    echo "any open source drivers."
  fi
}

usage(){
  echo "Usage:"
  echo " --install    Set up nvidia driver files"
  echo " --remove     Return to stock xorg files and restore all symlinks"
  echo " --help	      Show this help message"
}

case "$1" in
  "--install")
    nvidia_install
    
    ;;
  "--remove")
    nvidia_remove
    ;;
  "--help")
    usage
    ;;
  *)
    usage
    ;;
esac