#!/bin/bash
# Anticonf (tm) script by Jeroen Ooms (2017)
# V8 requires libv8 version 3.14 or 3.15. Newer versions are not supported.
# A suitable version is available here: https://github.com/v8-314/v8
# This script will check for the required cflags and ldflags.
# If your libv8 is installed in a custom location you need to set
# INCLUDE_DIR and LIB_DIR manually via e.g:
# R CMD INSTALL --configure-vars='INCLUDE_DIR=/.../include LIB_DIR=/.../lib'

PKG_DEB_NAME="libv8-3.14-dev (formerly: libv8-dev)"
PKG_RPM_NAME="v8-314-devel (formerly: v8-devel)"
PKG_CSW_NAME="libv8_dev"
PKG_BREW_NAME="v8-315"
PKG_TEST_HEADER="<v8.h>"
PKG_LIBS="-lv8"
PKG_LIBS_STATIC="-lv8_{base,snapshot} -lpreparser_lib"
PKG_CFLAGS="-I/usr/include/v8-3.14"

# Check for custom locations
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 $PKG_LIBS"
elif [[ "$OSTYPE" == "darwin"* ]]; then
  if [ $(command -v brew) ]; then
    BREWDIR=$(brew --prefix)
  else
    curl -sfL "https://jeroen.github.io/autobrew/$PKG_BREW_NAME" > $TMPDIR/autobrew
    source $TMPDIR/autobrew
  fi
  PKG_CFLAGS="-I$BREWDIR/opt/$PKG_BREW_NAME/include"
  PKG_LIBS="-L$BREWDIR/opt/$PKG_BREW_NAME/lib $PKG_LIBS"
fi

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

# 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)

# Test for libv8
echo "#include $PKG_TEST_HEADER" | ${CXXCPP} ${CPPFLAGS} ${PKG_CFLAGS} ${CXXFLAGS} -xc++ - >/dev/null 2>&1
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, EPEL)"
  echo " * brew: $PKG_BREW_NAME (OSX) -- NOT regular v8! Tap from homebrew/versions"
  echo " * csw: $PKG_CSW_NAME (Solaris)"
  echo "To use a custom libv8, set INCLUDE_DIR and LIB_DIR manually via:"
  echo "R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'"
  echo "--------------------------------------------------------------------"
  exit 1;
fi

# Test for libv8 version
${CXXCPP} ${CPPFLAGS} ${PKG_CFLAGS} ${CXXFLAGS} tools/version.cpp >/dev/null 2>&1
if [ $? -ne 0 ]; then
  echo "------------------------- ANTICONF ERROR ---------------------------"
  echo "Oh dear. The wrong version of libv8 is installed on the system."
  echo "This package needs the 3.14 / 3.15 branch of libv8."
  echo "On Fedora try this:"
  echo "  sudo yum remove v8-devel"
  echo "  sudo yum install v8-314-devel"
  echo "On MacOS Homebrew try this:"
  echo "  brew remove v8"
  echo "  brew tap homebrew/versions"
  echo "  brew install v8-315"
  echo "To use a custom libv8 build 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
