#!/bin/bash
# Anticonf (tm) script by Jeroen Ooms, Jim Hester (2016)
# 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="odbc"
PKG_DEB_NAME="unixodbc-dev"
PKG_RPM_NAME="unixodbc-devel"
PKG_CSW_NAME="unixodbc_dev"
PKG_BREW_NAME="unixodbc"
PKG_TEST_HEADER="<sql.h>"
PKG_LIBS=-lodbc

# Use odbc_config, iodbc-config if available
if [ "$(command -v odbc_config)" ]; then
  PKGCONFIG_CFLAGS=$(odbc_config --cflags)
  PKGCONFIG_LIBS=$(odbc_config --libs)
elif [ "$(command -v iodbc-config)" ]; then
  PKGCONFIG_CFLAGS=$(iodbc-config --cflags)
  PKGCONFIG_LIBS=$(iodbc-config --libs)
elif [ "$(command -v pkg-config)" ]; then
  PKGCONFIG_CFLAGS=$(pkg-config --cflags $PKG_CONFIG_NAME 2>/dev/null)
  PKGCONFIG_LIBS=$(pkg-config --libs $PKG_CONFIG_NAME 2>/dev/null)
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)
  else
    echo "Auto-brewing $PKG_BREW_NAME..."
    TEMP_DIR=${TMPDIR-${TMP-${TEMP-/tmp}}}
    BREWDIR=$TEMP_DIR/homebrew
    rm -Rf "$BREWDIR"
    BREWCACHE=$TEMP_DIR
    mkdir -p "$BREWDIR"
    echo "Auto-brewing $PKG_BREW_NAME in $BREWDIR..."
    curl -fsSL https://github.com/Homebrew/brew/tarball/master | tar xz --strip 1 -C "$BREWDIR"
    HOMEBREW_CACHE="$BREWCACHE" "$BREWDIR/bin/brew" install $PKG_BREW_NAME --force-bottle 2>&1 | perl -pe 's/Warning/Note/gi'
    rm -f "$BREWDIR/opt/$PKG_BREW_NAME/lib/*.dylib"
  fi
  PKG_CFLAGS="-I$BREWDIR/opt/$PKG_BREW_NAME/include"
  PKG_LIBS="-L$BREWDIR/opt/$PKG_BREW_NAME/lib $PKG_LIBS"
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 "PKG_CFLAGS=$PKG_CFLAGS"
echo "PKG_LIBS=$PKG_LIBS"

# Test for odbc
echo "#include $PKG_TEST_HEADER" | ${CXXCPP} ${CPPFLAGS} ${PKG_CFLAGS} ${CXXFLAGS} -xc++ - > /dev/null
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, etc)"
  echo " * rpm: $PKG_RPM_NAME (Fedora, CentOS, RHEL)"
  echo " * csw: $PKG_CSW_NAME (Solaris)"
  echo " * brew: $PKG_BREW_NAME (Mac OSX)"
  echo "To use a custom $PKG_CONFIG_NAME 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|@PKG_CXXFLAGS@|$PKG_CFLAGS|" -e "s|@PKG_LIBS@|$PKG_LIBS|" src/Makevars.in > src/Makevars

# Success
exit 0
