#!/bin/sh
# Anticonf (tm) script by Jeroen Ooms (2017)
# This script will query 'pkg-config' for the required cflags and ldflags.
# If pkg-config is unavailable or does not find the library, try setting
# INCLUDE_DIR and LIB_DIR manually via e.g:
# R CMD INSTALL --configure-vars='INCLUDE_DIR=/.../include LIB_DIR=/.../lib'

# Library settings
PKG_CONFIG_NAME="redland"
PKG_DEB_NAME="librdf0-dev"
PKG_RPM_NAME="redland-devel"
PKG_BREW_NAME="redland"
PKG_TEST_HEADER="<redland.h>"
PKG_LIBS="-lrdf"
PKG_CFLAGS=""

# Use pkg-config if available
pkg-config --exists ${PKG_CONFIG_NAME} >/dev/null 2>&1 && R_HAS_PKG_CONFIG=1;

platform=`uname`
# Use pkg-config if available
if [ $R_HAS_PKG_CONFIG ]; then
  echo "Found pkg-config ${PKG_CONFIG_NAME}"
  PKGCONFIG_CFLAGS=`pkg-config --cflags --silence-errors ${PKG_CONFIG_NAME}`
  PKGCONFIG_LIBS=`pkg-config --libs ${PKG_CONFIG_NAME}`
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=${PKGCONFIG_LIBS}
elif [ "$platform" = "Darwin" ]; then
  brew list ${PKG_BREW_NAME} >/dev/null 2>&1
  if [ $? -eq 0 ]; then
    echo "Configuring with brew."
    BREWDIR=`brew --prefix`
    PKG_CFLAGS=`$BREWDIR/opt/pkg-config/bin/pkg-config --cflags ${PKG_CONFIG_NAME}`
    PKG_LIBS=`$BREWDIR/opt/pkg-config/bin/pkg-config --libs --static ${PKG_CONFIG_NAME}`    
  else
    echo "Configuring with autobrew."
    curl -sfL "https://autobrew.github.io/scripts/${PKG_BREW_NAME}" > autobrew
    . autobrew
  fi
fi

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

# Find compiler
CC=`${R_HOME}/bin/R CMD config CC`
CFLAGS=`${R_HOME}/bin/R CMD config CFLAGS`
CPPFLAGS=`${R_HOME}/bin/R CMD config CPPFLAGS`

# Test configuration
echo "#include $PKG_TEST_HEADER" | ${CC} ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} -E -xc - >/dev/null 2>&1 || R_CONFIG_ERROR=1;

# Customize the error
if [ $R_CONFIG_ERROR ]; then
  echo "------------------------- ANTICONF ERROR ---------------------------"
  echo "Configuration failed because $PKG_CONFIG_NAME was not found. Try installing:"
  echo " * deb: $PKG_DEB_NAME (Debian, Ubuntu, etc)"
  echo " * rpm: $PKG_RPM_NAME (Fedora, EPEL)"
  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
