prime-select

#!/bin/bash

function GetAlternative() {
	if [ "$(ls /var/lib/pacman/local/mesa-libgl* 2> /dev/null)" ]; then
		echo "intel"
	elif [ "$(ls /var/lib/pacman/local/nvidia-libgl* 2> /dev/null)" ]; then
		echo "nvidia"
	fi
}

#Install the desired LibGL
function SetAlternative() {
	desired=$1
	currentalternative=$(GetAlternative)
	if [ "$desired" = "$currentalternative" ]; then
		echo "LibGL already is $currentalternative, nothing to do"
	else
		if [ "$desired" = "nvidia" ]; then
			#pacman --noconfirm -Rdd mesa lib32-mesa xf86-video-intel               
			pacman --noconfirm -S nvidia-utils lib32-nvidia-utils xf86-video-intel     
		elif [ "$desired" = "intel" ]; then
			pacman --noconfirm -Rdd nvidia-utils lib32-nvidia-utils      
			pacman --noconfirm -S mesa lib32-mesa             
			pacman --noconfirm -S xf86-video-intel                
		fi
	fi
}

#Write discrete card desired state in a file to be used later by another script
function WriteDesiredConfig() {
	discretestate=$1
	file="/etc/prime/state"
	if [ "$discretestate" = "nvidia" ]; then
		echo "ON" > "$file"
		cp /etc/prime/xorg.conf /etc/X11/
		if [ -f /etc/X11/xorg.conf.d/20-intel.conf ]; then
    		rm /etc/X11/xorg.conf.d/20-intel.conf
		fi
		cp /etc/prime/Xsetup /usr/share/sddm/scripts/
        chmod +x /usr/share/sddm/scripts/Xsetup
        if ! lsmod | grep "bbswitch" &> /dev/null ; then
            modprobe bbswitch
        fi
        echo "ON" >> /proc/acpi/bbswitch
	elif [ "$discretestate" = "intel" ]; then
		echo "OFF" > "$file"
		cp /etc/prime/20-intel.conf /etc/X11/xorg.conf.d/
		if [ -f /etc/X11/xorg.conf ]; then
    		rm /etc/X11/xorg.conf
		fi
        cp /etc/prime/Xsetup_intel /usr/share/sddm/scripts/Xsetup
        chmod +x /usr/share/sddm/scripts/Xsetup
	fi
}

argument=$1

#Checks if argument is valid and if not already active will attempt to do so.
if [ "$argument" = "intel" ] || [ "$argument" = "nvidia" ]; then
	if [[ $EUID -ne 0 ]]; then
		echo "This script must be run as root"
		exit 1
	fi
	SetAlternative "$argument"
	WriteDesiredConfig "$argument"
else
	if [ "$argument" = "query" ]; then
		currentalternative=$(GetAlternative)
		echo "$currentalternative"
	else
		echo "Usage prime.sh intel|nvidia|query"
	fi
fi