update_lwjgl.sh

#!/usr/bin/env bash

mcdir="$HOME/.minecraft"
downloader="wget --no-check-certificate -q -O"
os="linux"
natives="libjinput-linux libjinput-linux64 liblwjgl liblwjgl64 libopenal libopenal64"

echo "Determining installed LWJGL version..."
installed="$(unzip -p $mcdir/bin/lwjgl.jar | strings | grep  '^[0-9]*\.[0-9]*\.[0-9]*')"
echo "LWJGL $installed installed"

echo "Determining latest online version..."
latest=$(${downloader%%-o} - http://lwjgl.org/download.php | grep -oE  "https?:\/\/sourceforge.net\/projects\/java-game-lib\/files\/Official%20Releases\/LWJGL%20[0-9|\.]*")
echo "Found version ${latest##*%20}"

if [[ "${latest##*%20}" == "$installed" ]]; then
	echo "LWJGL already at current version."
	if [[ "$1" == "--force" ]] ; then
		echo "Updating anyways..."
	else
		exit 0
	fi
fi

echo "Determining download URL..."
dlurl=$(${downloader%%-o} - "$latest" | grep -oE -m1 "https?://sourceforge.net/projects/java-game-lib/files/Official%20Releases/LWJGL%20[0-9|\.]*/lwjgl-[0-9|\.]*.zip")

echo "Checking if ~./cache/ exists..."
if [[ ! -d "$HOME/.cache/" ]] ; then
	echo "~/.cache/ did not exist.  Creating..."
	mkdir "$HOME/.cache/"
fi

echo "Downloading latest LWJGL..."
$downloader "$HOME/.cache/lwjgl.zip" "$dlurl"

echo "Extracting zip file..."
unzip -qqo "$HOME/.cache/lwjgl.zip" -d "$HOME/.cache/"

echo "Copying files..."
lwjgldir=$(find -L "$HOME/.cache" -maxdepth 1 -type d -name "*lwjgl*" -print)
for i in "jinput" "lwjgl" "lwjgl_util" ; do
	echo "Copying $i..."
	mkdir -p "$mcdir/bin/"
	cp "$lwjgldir/jar/$i.jar" "$mcdir/bin/"
done

for i in $natives ; do
	echo "Copying $i..."
	mkdir -p "$mcdir/bin/natives/"
	cp "$lwjgldir/native/$os/$i.so" "$mcdir/bin/natives/"
done

echo "Deleting cache..."
rm -rf "$lwjgldir"