games/marathon-red-data: Script update.

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

games/marathon-red-data/README

@@ -3,10 +3,13 @@ marathon-red-data (game data for use with alephone package)
 Created to be a survival horror-esque conversion, Marathon RED is
 widely known as the single most difficult of all conversions.
 
-Marathon RED features a new arsenal of weapons, new monsters and textures.
+Marathon RED features a new arsenal of weapons, new monsters and
+textures.
 
 Included in the package is a shell script wrapper. Type "marathon-red"
 or select Marathon RED from the KDE or XFCE "Games" menu.
 
 To install the gamedata in /opt instead of /usr to save space in the
-root partition use use OPT=yes ./marathon-red-data.SlackBuild
+root partition use use:
+
+  OPT=yes ./marathon-red-data.SlackBuild

games/marathon-red-data/marathon-red-data.SlackBuild

@@ -2,7 +2,7 @@
 
 # Slackware build script for Marathon RED
 
-# Copyright 2015 Hunter Sezen California, USA
+# Copyright 2015, 2018 Hunter Sezen California, USA
 # All rights reserved.
 #
 # Redistribution and use of this script, with or without modification, is
@@ -34,14 +34,13 @@ TMP=${TMP:-/tmp/SBo}
 PKG=$TMP/package-$PRGNAM
 OUTPUT=${OUTPUT:-/tmp}
 
-set -e
+set -eu
 
 # install gamedata in opt instead of usr
-OPT=${OPT:-no}
-if [ "${OPT:-yes}" == "yes" ]; then
-    DATA="/opt/AlephOne"
+if [ "${OPT:-0}" != 0 ]; then
+  DATA='/opt/AlephOne'
 else
-    DATA="/usr/share/AlephOne/gamedata"
+  DATA='/usr/share/AlephOne/gamedata'
 fi
 
 ZIPNAME=MarathonRED
@@ -50,9 +49,8 @@ WRAPPER=marathon-red
 DATADIR=$PKG$DATA
 
 rm -rf $PKG
-mkdir -p $TMP $PKG $OUTPUT
+mkdir -p $TMP $PKG $OUTPUT $DATADIR
 cd $TMP
-mkdir -p $DATADIR
 unzip $CWD/$ZIPFILE -d $DATADIR
 
 chown -R root:root $DATADIR