#!/bin/sh

## Written by halflife (vzdorovenco@yahoo.com)

## Feel free to use, modify, redistribute this script.
## If you make changes please modify the "Written by"
## so that I don't recieve emails about a script I
## did not write. Thanks.

# Modified by Robby Workman 20071027
# I won't change the "Written by" line, because I didn't
# change who wrote the script.  If there are questions as
# to whether my changes caused a problem, feel free to
# send mail to me first.

# Package adaptation in order to rename it from otp-R11B
# to erlang-otp, by LukenShiro <Lukenshiro@ngi.it>

# Modified by Ryan S. Northrup <northrup@yellowapple.us> on
# 28 November 2016 to reflect the use of README.md instead
# of README in upstream
# Modified by Rafael Tavares <mdrafaeltavares@gmail.com> for gfs (2021)

PRGNAM=$(basename $0 | cut -f1 -d.)
VERSION=${VERSION:-$(find . -maxdepth 1 -name "$PRGNAM-*.tar.?z*" | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-1}
TAG=${TAG:-_gfs}

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

CWD=$(pwd)
TMP=${TMP:-/tmp/gfs}
PKG=$TMP/pkg-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}
JOBS=${JOBS:-" -j$(expr $(getconf _NPROCESSORS_ONLN) \* 2 ) "}

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

UMASKBKP=$(umask)
umask 0022

DEPCHK=""
OPTDEP=""

if [ -z $VERSION ]
 then
 VERSION=23.2
fi

SRC_NAME_VERSION=otp_src_${VERSION}
DOC_NAME_VERSION=otp_doc_man_${VERSION}

MDSCHECK=(
"http://www.erlang.org/download/otp_src_$VERSION.tar.gz e315f59eb9e420a0e469c09649f4303f"
"http://www.erlang.org/download/otp_doc_man_$VERSION.tar.gz cfef029c3d4d6acf2cc04f8589002ecd"
)

DWNLCMD=${DWNLCMD:-"wget -c --no-check-certificate"}

for md5check in "${MDSCHECK[@]}"; do
 FILENAME=$(echo $md5check | cut -f1 -d" " | rev | cut -f1 -d"/" | rev)
 MD5SNUMB=$(echo $md5check | cut -f2 -d" ")
 FILETOCHECK=${FILETOCHECK:-$(find . -maxdepth 1 -name $(echo "$FILENAME" | cut -f1 -d" "))}
 MD5SUMCHECK=${MD5SUMCHECK:-$(find . -maxdepth 1 -name $(echo "$MD5SNUMB" | cut -f2 -d" "))}
 if [ -z "$FILETOCHECK" ]; then
  SRCTODOWN=$(echo $md5check | cut -f1 -d" " )
  $DWNLCMD $SRCTODOWN
  unset $SRCTODOWN
 else
  if md5sum -c <<<"$MD5SNUMB $FILENAME"; then
   continue
  else
   rm -rf "$FILETOCHECK"
   SRCTODOWN=$(echo $md5check | cut -f1 -d" " )
   $DWNLCMD $SRCTODOWN
   unset $SRCTODOWN
  fi
 fi
done

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $SRC_NAME_VERSION
tar xvf $CWD/${SRC_NAME_VERSION}.tar.gz
cd $SRC_NAME_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 {} \;

CFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --build=$ARCH-slackware-linux

INSTALL_DV="install: install.dirs install.emulator install.libs"
sed -i -e "s|$INSTALL_DV install.Install install.bin|$INSTALL_DV|" Makefile

make $JOBS || make
make INSTALL_PREFIX=$PKG install

cd $PKG/usr/bin
  for file in erl erlc epmd run_erl to_erl dialyzer typer escript ; do
    rm -f $file
    ln -s ../lib${LIBDIRSUFFIX}/erlang/bin/$file .
  done
cd -

mkdir -p $PKG/usr/lib${LIBDIRSUFFIX}/erlang
tar xvf $CWD/$DOC_NAME_VERSION.tar.gz -C $PKG/usr/lib${LIBDIRSUFFIX}/erlang
chown -R root:root $PKG/usr/lib${LIBDIRSUFFIX}/erlang
chmod -R u+w,go+r-w,a-s $PKG/usr/lib${LIBDIRSUFFIX}/erlang

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
( cd $PKG/usr/lib${LIBDIRSUFFIX}/erlang
  mv COPYRIGHT README.md $PKG/usr/doc/$PRGNAM-$VERSION )
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

mv $PKG/usr/lib${LIBDIRSUFFIX}/erlang/man $PKG/usr
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 $PKG/install
#      |-----handy-ruler------------------------------------------------------|
cat <<EOT >$PKG/install/slack-desc
$PRGNAM:
$PRGNAM: erlang-otp (programming language)
$PRGNAM:
$PRGNAM: Erlang is a general-purpose concurrent programming language and
$PRGNAM: runtime system.
$PRGNAM: The sequential subset of Erlang is a functional language,
$PRGNAM: with strict evaluation, single assignment, and dynamic typing.
$PRGNAM: It was designed by Ericsson to support distributed,
$PRGNAM: fault-tolerant, soft-real-time, non-stop applications.
$PRGNAM:
$PRGNAM: http://www.erlang.org/
EOT

cat <<EOT >$PKG/install/doinst.sh
chroot . sh /usr/lib${LIBDIRSUFFIX}/erlang/Install -minimal /usr/lib${LIBDIRSUFFIX}/erlang 1>/dev/null 2>/dev/null
EOT

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

umask ${UMASKBKP}