Wrapper script for League of Legends client in wine

LeagueClient.sh

#!/bin/bash
set -e
league_dir=$(dirname $0)
export MESA_GL_VERSION_OVERRIDE=4.5COMPAT
export VBLANK_MODE=0
export MESA_GLTHREAD=true
resolution=$(xrandr | grep ' connected ' | awk '{print $4}' | egrep -o '^[0-9]+x[0-9]+')
width=$(echo $resolution | awk -F 'x' '{print $1}')
height=$(echo $resolution | awk -F 'x' '{print $2}')

# Replaces a variable in the config file with a new value
replace_var() {
	awk -F '=' "{ if (\$1 == \"$1\") { print \$1 \"=\" \"$2\\r\" } else { print \$0 } }"
}

# Now, update the game config file for our screen resolution
pushd "$league_dir/Config"
if [ -e 'game.cfg.bak' ]; then
	if [ ! -z "$(diff game.cfg.bak game.cfg)"]; then
		echo 'game.cfg.bak exists and there are differences with game.cfg. Refusing to continue.' >&2
		echo 'If the game ran ok last time, it should be ok to delete it and continue' >&2
		exit 1
	fi
fi
cp game.cfg game.cfg.bak
cat 'game.cfg.bak' |
	replace_var 'Height' "$height" |
	replace_var 'Width' "$width" |
	replace_var 'ItemShopPrevResizeWidth' "$width" |
	replace_var 'ItemShopPrevResizeHeight' "$height" > game.cfg
popd

# Finally, run the game
wine "$league_dir/LeagueClient.exe"