#!/bin/bash
# Build script for Slackware
# Damien Goutte-Gattat "gouttegd" <Damien.Goutte-Gattat at e.ujf-grenoble.fr>
#
# Redistribution and use of this script, with or without modifications, 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.
#
# Latest R sourcecode is available at:
# http://www.r-project.org/
#
# Recommends: l/libatlas

# Source package infos
NAMESRC=${NAMESRC:-R}
VERSION=${VERSION:-2.7.1}
ARCHIVE=${ARCHIVE:-$NAMESRC-$VERSION.tar.gz}
WGET=${WGET:-http://cran.cict.fr/src/base/R-2/$ARCHIVE}

# Built package infos
NAMETGZ=${NAMETGZ:-R}
BUILD=${BUILD:-1GGD}
ARCH=${ARCH:-i486}
TARGET=${TARGET:-i486}

# Directories
TMP=${TMP:-/tmp}
OUT=${OUT:-$TMP/build}
PKG=${PKG:-$OUT/$NAMETGZ}
CWD=$(pwd)

set -e  # Quit if a command returns non-zero

# Sanity checks
if [ $UID -eq 0 ]; then
    echo "You should NOT run this script as ROOT!"
    exit 1
fi
if [ ! -d $TMP ]; then
    echo "$TMP does not exist or is not a directory!"
    exit 1
fi

# Compilation flags
case "$ARCH" in
i?86)
    CPUOPT="-O2 -march=$ARCH -mtune=i686"
    ;;
*)
    CPUOPT="-O2"
    ;;
esac

# Get and verify the source archive
if [ ! -r $ARCHIVE ]; then
    wget "$WGET"
fi
sha1sum -c $ARCHIVE.sha1
NAME=$(tar ft $ARCHIVE | head -n 1 | cut -d / -f 1)

# Compile
cd $TMP
echo "Building $ARCHIVE..."
tar xf $CWD/$ARCHIVE
cd $NAME
CFLAGS=$CPUOPT \
CXXFLAGS=$CPUOPT \
./configure \
  --prefix=/usr \
  --mandir=/usr/man \
  --infodir=/usr/info \
  --with-blas \
  --with-lapack="-lcblas -latlas -llapack" \
  --with-system-zlib \
  --with-system-bzlib \
  --with-system-pcre
make -j 3
make install DESTDIR=$PKG
make install-info DESTDIR=$PKG

# Strip binaries
find $PKG | xargs file | grep "ELF 32-bit LSB" | cut -d : -f 1 | \
  xargs strip --strip-unneeded 2> /dev/null

# Compress man and info pages
find $PKG/usr/man  -type f -exec gzip -9 '{}' \;
find $PKG/usr/info -type f -exec gzip -9 '{}' \;
rm -f $PKG/usr/info/dir.*

# Install the documentation at the right place
mkdir -p $PKG/usr/doc
mv $PKG/usr/lib/R/doc $PKG/usr/doc/$NAME

# Copy slack-desc file
install -D -m 644 $CWD/slack-desc $PKG/install/slack-desc

# Package the tree
cd $PKG
mkdir -p $OUT
PACKAGING="
chown root:root . -R
/sbin/makepkg -l y -c n $OUT/$NAMETGZ-$VERSION-$ARCH-$BUILD.tgz
rm -rf $PKG
rm -rf $TMP/$NAME
"
if type -p fakeroot ; then
    echo "$PACKAGING" | fakeroot
else
    su -c "$PACKAGING"
fi