cataclysm starter

#!/bin/sh
TARGET_FILE=$0

cd `dirname $TARGET_FILE`
TARGET_FILE=`basename $TARGET_FILE`

# Iterate down a (possible) chain of symlinks
while [ -L "$TARGET_FILE" ]
do
    TARGET_FILE=`readlink $TARGET_FILE`
    cd `dirname $TARGET_FILE`
    TARGET_FILE=`basename $TARGET_FILE`
done

# Compute the canonicalized name by finding the physical path
# for the directory we're in and appending the target file.
PHYS_DIR=`pwd -P`
RESULT=$PHYS_DIR/$TARGET_FILE
echo $RESULT

DIR=$(dirname $RESULT)
BIN=$(basename $RESULT)

cd "$DIR" || exit $?

# If name does not match a binary or is this same script, find the right one
if [ ! -f "$BIN" ] || [ "$BIN" = "$(basename $RESULT)" ]
then
    BIN=
    for bin in cataclysm-tiles cataclysm
    do
        [ -f "$bin" ] && BIN="$bin" && break
    done
fi

if [ "$BIN" ]
then
    exec "./$BIN"
else
    echo "Couldn't find cataclysm game binary in $DIR/"
    exit 1
fi