make install.sh script compatible for running on non-arch systems

install.sh

@@ -1,16 +1,19 @@
 #!/bin/bash
-packagefile="packages.txt"
+PACKAGEFILE="packages.txt"
 
 # Ensure we are in the correct directory
 pushd "$(dirname "$(realpath "$0")")" &> /dev/null
 
+# Check if commands are available
+command -v yay &> /dev/null && CMD_YAY=true || CMD_YAY=false
+
 # Read packages.txt and install packages on system using yay
 function install_packages {
 	local install
-	for pkg in $(sed -E -e 's/\s*#.*$//g' -e 's/^\s+//g' "$packagefile" | sed -E ':a;N;$!ba;s/\s+/\n/g'); do
+	for pkg in $(sed -E -e 's/\s*#.*$//g' -e 's/^\s+//g' "$PACKAGEFILE" | sed -E ':a;N;$!ba;s/\s+/\n/g'); do
 		# check if package is installed
 		local installed
-		yay -Q "$(echo "$pkg")" &> /dev/null && installed=1 || installed=0
+		$CMD_YAY && yay -Q "$(echo "$pkg")" &> /dev/null && installed=1 || installed=0
 		if [ $installed -eq 0 ]; then
 			# needs to be installed
 			install="$install"$'\n'"$pkg"
@@ -18,9 +21,19 @@ function install_packages {
 	done
 
 	[ -z "$install" ] || {
-		echo "Packages to be installed: "
-		echo "$install"
-		yay -S $install
+		if $CMD_YAY; then
+			echo "Packages to be installed: "
+			echo "$install"
+			yay -S $install
+		else
+			echo "Yay package manager is not available"
+			echo "Please make sure that the following tools"
+			echo "are available in your system"
+			echo ""
+			echo "$install"
+			echo ""
+			read -p "Press Enter to continue" < /dev/tty
+		fi
 	}
 }