#!/bin/bash
# Anticonf script by Jeroen Ooms (2016)
# The script will try 'Magick++-config' and 'pkg-config' to find required
# cflags and ldflags. Make sure this executable is in PATH when installing
# the package. Alternatively, you can set INCLUDE_DIR and LIB_DIR manually:
# R CMD INSTALL --configure-vars='INCLUDE_DIR=/.../include LIB_DIR=/.../lib'

# Library settings
PKG_CONFIG_NAME="ImageMagick++"
PKG_DEB_NAME="libmagick++-dev"
PKG_RPM_NAME="ImageMagick-c++-devel"
PKG_CSW_NAME="imagemagick_dev"
PKG_BREW_NAME="imagemagick"
PKG_TEST_HEADER="<Magick++.h>"
PKG_LIBS="-lMagick++-6.Q16"
PKG_TEST_HEADER="<Magick++.h>"

# Use Magick++-config (on Solaris /opt/csw/bin must be in PATH)
if [ $(command -v pkg-config) ]; then
  PKGCONFIG_CFLAGS=$(pkg-config --cflags --silence-errors ${PKG_CONFIG_NAME})
  PKGCONFIG_LIBS=$(pkg-config --libs ${PKG_CONFIG_NAME})
elif [ $(command -v Magick++-config) ]; then
  PKGCONFIG_CFLAGS=$(Magick++-config --cflags)
  PKGCONFIG_LIBS=$(Magick++-config --libs)
fi

# Pick up on GraphicsMagick but warn against it
if [ -z "$PKGCONFIG_LIBS" ] && [ $(command -v GraphicsMagick++-config) ]; then
  echo "Warning: found GraphicsMagick++ instead of ImageMatick++. Not recommended."
  PKGCONFIG_CFLAGS=$(GraphicsMagick++-config --cppflags)
  PKGCONFIG_LIBS=$(GraphicsMagick++-config --libs)
fi

# Note that cflags may be empty in case of success
if [ "$INCLUDE_DIR" ] || [ "$LIB_DIR" ]; then
  echo "Found INCLUDE_DIR and/or LIB_DIR!"
  PKG_CFLAGS="-I$INCLUDE_DIR $PKG_CFLAGS"
  PKG_LIBS="-L$LIB_DIR $PKG_LIBS"
elif [ "$PKGCONFIG_CFLAGS" ] || [ "$PKGCONFIG_LIBS" ]; then
  echo "Found pkg-config cflags and libs!"
  PKG_CFLAGS=${PKGCONFIG_CFLAGS}
  PKG_LIBS=${PKGCONFIG_LIBS}
elif [[ "$OSTYPE" == "darwin"* ]]; then
  if [ $(command -v brew) ]; then
    BREWDIR=$(brew --prefix)
    INCLUDE_DIR=$(echo /usr/local/opt/imagemagick/include/*)
    PKG_CFLAGS="-I$INCLUDE_DIR -DMAGICKCORE_QUANTUM_DEPTH=16 -DMAGICKCORE_HDRI_ENABLE=0"
    PKG_LIBS="-L$BREWDIR/opt/$PKG_BREW_NAME/lib $PKG_LIBS"
  else
    BREWDIR="/tmp/homebrew"
    BREW="$BREWDIR/bin/brew"
    rm -Rf $BREWDIR
    mkdir -p $BREWDIR
    echo "Auto-brewing $PKG_BREW_NAME in $BREWDIR..."
    curl -fsSL https://github.com/Homebrew/brew/tarball/master | tar xz --strip 1 -C $BREWDIR

    # Get dependencies
    BREW_DEPS=$($BREW deps -n $PKG_BREW_NAME)
    HOMEBREW_CACHE="/tmp" $BREW install $BREW_DEPS fontconfig fftw --force-bottle 2>&1 | perl -pe 's/Warning/Note/gi'
    HOMEBREW_CACHE="/tmp" $BREW install imagemagick --without-modules --with-fftw --with-fontconfig 2>&1 | perl -pe 's/Warning/Note/gi'

    # Get build flags from pkg-config
    PKG_CONFIG="$BREWDIR/bin/pkg-config"
    PKG_CFLAGS=$($PKG_CONFIG --cflags $PKG_CONFIG_NAME)
    PKG_CFLAGS="$PKG_CFLAGS -DBUILD_AUTOBREW"
    PKG_LIBS=$($PKG_CONFIG --libs --static $PKG_CONFIG_NAME libpng)
    PKG_LIBS="-L$BREWDIR/lib $PKG_LIBS -lexpat" #pkg-config misses a few paths
    rm -f $BREWDIR/Cellar/*/*/lib/*.dylib

    # Prevent CRAN builder from linking against old libs in /usr/local/lib
    for FILE in $BREWDIR/Cellar/*/*/lib/*.a; do
      BASENAME=$(basename $FILE)
      LIBNAME=$(echo "${BASENAME%.*}" | cut -c4-)
      cp -f $FILE $BREWDIR/lib/libbrew$LIBNAME.a
      echo "created $BREWDIR/lib/libbrew$LIBNAME.a"
      PKG_LIBS=$(echo $PKG_LIBS | sed "s/-l$LIBNAME /-lbrew$LIBNAME /g")
    done
    rm -f $BREWDIR/lib/*.dylib
  fi
fi

# Find compiler
CXXCPP=$(${R_HOME}/bin/R CMD config CXXCPP)
CXXFLAGS=$(${R_HOME}/bin/R CMD config CXXFLAGS)
CPPFLAGS=$(${R_HOME}/bin/R CMD config CPPFLAGS)

# For debugging
echo "Using PKG_CFLAGS=$PKG_CFLAGS"
echo "Using PKG_LIBS=$PKG_LIBS"

# Test configuration
echo "#include $PKG_TEST_HEADER" | ${CXXCPP} ${CPPFLAGS} ${PKG_CFLAGS} ${CXXFLAGS} -xc++ - >/dev/null 2>&1

# Customize the error
if [ $? -ne 0 ]; then
  echo "------------------------- ANTICONF ERROR ---------------------------"
  echo "Configuration failed because $PKG_CONFIG_NAME was not found. Try installing:"
  echo " * deb: $PKG_DEB_NAME (Debian, Ubuntu)"
  echo " * rpm: $PKG_RPM_NAME (Fedora, CentOS, RHEL)"
  echo " * csw: $PKG_CSW_NAME (Solaris)"
  echo " * brew: $PKG_BREW_NAME (OSX)"
  echo "If $PKG_CONFIG_NAME is already installed, check that 'pkg-config' is in your"
  echo "PATH and PKG_CONFIG_PATH contains a $PKG_CONFIG_NAME.pc file. If pkg-config"
  echo "is unavailable you can set INCLUDE_DIR and LIB_DIR manually via:"
  echo "R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'"
  echo "--------------------------------------------------------------------"
  exit 1;
fi

# Write to Makevars
sed -e "s|@cflags@|$PKG_CFLAGS|" -e "s|@libs@|$PKG_LIBS|" src/Makevars.in > src/Makevars

# Success
exit 0
