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#!/bin/bash

# Slackware build script for lua52

# Copyright 2018 Azure Zanculmarktum <zanculmarktum@gmail.com>
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# Some of the codes were taken from development/lua/lua.SlackBuild

cd $(dirname $0) ; CWD=$(pwd)

PRGNAM=lua52
SRCNAM=${PRGNAM%??}
VERSION=${VERSION:-5.2.4}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}
PKGTYPE=${PKGTYPE:-tgz}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
# the name of the created package would be, and then exit. This information
# could be useful to other scripts.
if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE"
  exit 0
fi

TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $SRCNAM-$VERSION
tar xvf $CWD/$SRCNAM-$VERSION.tar.gz
cd $SRCNAM-$VERSION
chown -R root:root .
find -L . \
  \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
    -o -perm 511 \) -exec chmod 755 {} \; -o \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
    -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

eval $(sed -ne '/^\(V\|R\)= /s, ,,p' Makefile)

sed -i \
  -e '/^INSTALL_TOP= /s,\(/usr\).*,\$(DESTDIR)\1,' \
  -e '/^INSTALL_INC= /s,include,&/lua\$V,' \
  -e '/^INSTALL_LIB= /s,lib,&'"${LIBDIRSUFFIX}"',' \
  -e '/^INSTALL_CMOD= /s,lib,&'"${LIBDIRSUFFIX}"',' \
  -e '/^TO_BIN= /s,luac\?,&\$V,g' \
  -e '/^TO_LIB= /s,liblua,&\$V,' \
  Makefile

sed -i \
  -e '/^CFLAGS= /s,-O2,'"$SLKCFLAGS"',' \
  -e '/-DLUA_USE_LINUX.*-Wl,-E -ldl -lreadline/s|-lreadline|& -lncurses|' \
  -e '/^LUA_A=/s,liblua,&'"$V"',' \
  -e '/^LUA_T=/s,lua,&'"$V"',' \
  -e '/^LUAC_T=/s,luac,&'"$V"',' \
  src/Makefile

sed -i \
  -e '/^#define LUA_ROOT/s,".*,"/usr/",' \
  -e '/^#define LUA_CDIR/s,"lib,&'"${LIBDIRSUFFIX}"',' \
  src/luaconf.h

make linux
make install DESTDIR=$PKG

# Now let's build the shared library
mkdir -p shared
cd shared
  ar -x $PKG/usr/lib${LIBDIRSUFFIX}/liblua$V.a
  gcc -ldl -lreadline -lncurses -lm -shared *.o -o liblua$V.so.$R
  cp -a liblua$V.so.$R $PKG/usr/lib${LIBDIRSUFFIX}
  ( cd $PKG/usr/lib${LIBDIRSUFFIX}
    ln -s liblua$V.so.$R liblua$V.so.$V
    ln -s liblua$V.so.$R liblua$V.so.${V%??}
    ln -s liblua$V.so.$R liblua$V.so
  )
cd - >/dev/null

mkdir -p $PKG/usr/lib${LIBDIRSUFFIX}/pkgconfig
cd $PKG/usr/lib${LIBDIRSUFFIX}/pkgconfig
  sed \
    -e '/^V= /s, .*, '"$V"',' \
    -e '/^R= /s, .*, '"$R"',' \
    -e '/^prefix= /s,\(/usr\).*,\1,' \
    -e '/^INSTALL_INC= /s,include,&/lua\${V},' \
    -e '/^INSTALL_LIB= /s,lib,&'"${LIBDIRSUFFIX}"',' \
    -e '/^INSTALL_CMOD= /s,lib,&'"${LIBDIRSUFFIX}"',' \
    -e '/^libdir=/s,/lib,&'"${LIBDIRSUFFIX}"',' \
    -e '/^includedir=/s,/include,&/lua\${V},' \
    $CWD/lua.pc.in > lua$V.pc
  ln -s lua$V.pc lua-$V.pc
  ln -s lua$V.pc lua${V%.?}${V#?.}.pc
cd - >/dev/null

cd $PKG/usr/man/man1
  mv lua.1 lua$V.1
  mv luac.1 luac$V.1
cd - >/dev/null

find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

find $PKG/usr/man -type f -exec gzip -9 {} \;
for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a README $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE