# Description: R is a free software environment for statistical computing and graphics
# URL: https://www.r-project.org/
# Maintainer: Tim Biermann, tbier at posteo dot de
# Depends on: libpcre2 openblas zstd
# Optional: lapack openjdk8 texlive tk

name=r
version=4.0.3
release=1
source=(https://cran.r-project.org/src/base/R-4/R-$version.tar.gz
  r.desktop r.png R.conf
  R-3.4.1-parallel.patch R-3.4.1-rmath-shared.patch
  R-3.6.2-no-LDFLAGS-in-libR-pkg-config.patch)

build() {
  cd R-$version

  # https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-lang/R/files
  patch -Np1 -i $SRC/R-3.4.1-parallel.patch
  patch -Np1 -i $SRC/R-3.4.1-rmath-shared.patch
  patch -Np1 -i $SRC/R-3.6.2-no-LDFLAGS-in-libR-pkg-config.patch

  # configuring R
  [[ -e /usr/lib/pkgconfig/tk.pc ]] && PKGMK_R+=" --with-x=yes" || PKGMK_R+=" --with-x=no"
  [[ -e /usr/lib/pkgconfig/lapack.pc ]] && PKGMK_R+=" --with-lapack LAPACK_LIBS=$(pkg-config --libs lapack)"
  # this needs a properly working java environment!
  [[ -e $(whereis javac) ]] && PKGMK_R+=" --enable-java" || PKGMK_R+=" --disable-java"

  # set the correct dir for texmf distribution
  sed -i 's|$(rsharedir)/texmf|${datarootdir}/texmf|' share/Makefile.in

  unset R_HOME

  # version 3.6.2 needs at least the addition to FCFLAGS
  export CFLAGS+=' -fPIC'
  export CPPFLAGS+=' -fPIC'
  export FCFLAGS+=' -fPIC'
  ./configure $PKGMK_R \
    --prefix=/usr \
    --libdir=/usr/lib \
    --sysconfdir=/etc/R \
    --datarootdir=/usr/share \
    rsharedir=/usr/share/R/ \
    rincludedir=/usr/include/R/ \
    F77=gfortran \
    LIBnn=lib \
    BLAS_LIBS=$(pkg-config --libs blas) \
    PKG_CONFIG=/usr/bin/pkg-config \
    --with-blas \
    --enable-BLAS-shlib \
    --enable-R-shlib \
    --enable-byte-compiled-packages \
    --disable-nls
  make

  # make nmath library
  pushd src/nmath/standalone
  make shared
  popd

  # install R to $PKG
  make DESTDIR=$PKG install
  # same for the nmath library
  pushd src/nmath/standalone
  make DESTDIR=$PKG install
  #popd

  sed -i "s|$PKG ||" "$PKG/usr/bin/R"
  rm "$PKG/usr/lib/R/bin/R"
  cd "$PKG/usr/lib/R/bin"
  ln -s ../../../bin/R

  install -Dm644 "$SRC/r.desktop" \
    "$PKG/usr/share/applications/r.desktop"
  install -Dm644 "$SRC/r.png" \
    "$PKG/usr/share/pixmaps/r.png"
  install -Dm644 "$SRC/R.conf" \
    "$PKG/etc/ld.so.conf.d/R.conf"

  install -d $PKG/etc/R
  cd $PKG/usr/lib/R/etc
  for i in *; do
    mv -f ${i} $PKG/etc/R
    ln -s /etc/R/$i $i
  done

  #clean up
  find $PKG \(\
    -iname '*README*' -o \
    -iname '*COPYING*' -o \
    -iname '*AUTHORS*' -o \
    -iname '*THANKS*' -o \
    -iname '*NEWS*' -o \
    -iname '*LICENSE*' -o \
    -iname '*CHANGELOG*' \
    \) -exec rm -r '{}' \+ || true
    ## doh! don't remove INSTALL or you won't be able to install R packages
    #-iname '*INSTALL*' -o \
    ## rstudio now depends on finding docs that R provides..
    #-iname 'doc' -o \
}