#!/bin/sh

echo ""

# defaults
DEBUG=no
with_libdb=test
with_mysql=test

# parse options
# --with/--without parsing copied from autoconf's output
while [ $# -gt 0 ]; do
  case $1 in
    --with-*)
      ac_option=$1
      ac_optarg=`expr "x$ac_option" : 'x[^=]*=\(.*\)'`
      ac_package=`expr "x$ac_option" : 'x-*with-\([^=]*\)'`
      # Reject names that are not valid shell variable names.
      expr "x$ac_package" : ".*[^A-Za-z0-9_-]" >/dev/null &&
        { echo "error: invalid package name: $ac_package"; exit 1; }
      ac_package=`echo $ac_package | sed 's/-/_/g'`
      case $ac_option in
        *=*)
          ac_optarg=`echo "$ac_optarg" | sed "s/'/'\\\\\\\\''/g"`
          ;;
        *)
          ac_optarg=yes
          ;;
      esac
      eval "with_$ac_package='$ac_optarg'"
      ;;
    --without-*)
      ac_option=$1
      ac_optarg=`expr "x$ac_option" : 'x[^=]*=\(.*\)'`
      ac_package=`expr "x$ac_option" : 'x-*without-\([^=]*\)'`
      # Reject names that are not valid shell variable names.
      expr "x$ac_package" : ".*[^A-Za-z0-9_-]" >/dev/null &&
        { echo "error: invalid package name: $ac_package"; exit 1; }
      ac_package=`echo $ac_package | sed 's/-/_/g'`
      eval "with_$ac_package=no"
      ;;
    --debug=yes|--debug|-d)
      echo "Debug mode enabled."
      with_debug=yes
      ;;
    --debug=no)
      echo "Debug mode disabled."
      with_debug=no
      ;;
    --help|-help|-h)
      echo "usage: $0 [ options ]"
      echo "available options:"
      echo "  --debug=yes (or -d)     Enable debugging support."
      echo "  --debug=no              Disable debugging support."
      echo "  --with-package          Enable support for package in default location."
      echo "  --with-package=path     Enable support for package installed in path."
      echo "  --without-package       Disable support for package."
      echo "  --help (or -h)          Show this message."
      echo ""
      echo "relevant packages:"
      echo "  libdb = BerkeleyDB"
      echo "  mysql = MySQL database"
      exit 1
      ;;
    *)
      echo "Unknown option '$1', try -h for help"
      exit 1
      ;;
  esac
  shift
done

echo "Examining system setup..."

# Some known configs:
#
# uname -s   uname -r      uname -m   uname -p
# ========   ===========   ========   ========
# SunOS      5.6           sun4u      sparc
# Linux      2.2.17        i686       unknown
# FreeBSD    4.1-RELEASE   i386       i386

UNAME_S=`uname -s`
UNAME_R=`uname -r`

case "$UNAME_S" in
  Linux)
    if [ "$with_debug" = "yes" ]; then
      CCDBG="-g"
      LDDBG="-g"
    else
      CCDBG="-DNDEBUG"
      LDDBG=""
    fi
    CC=gcc
    CFLAGS="$CCDBG -D_UNIX -D_LINUX -Wall"
    CXX=g++
    CXXFLAGS=${CFLAGS}
    AR=ar
    ARFLAGS="-rc"
    LD=gcc
    LDFLAGS="$LDDBG"
    SYSLIBS=""
    LIBDB_LIB="-ldb"
    MYSQL_LIB="-lmysqlclient"
    ;;
  FreeBSD)
    case "$UNAME_R" in
      2.*)
        OSVER=20
        ;;
      3.*)
        OSVER=30
        ;;
      4.*)
        OSVER=40
        ;;
      *)
        # Assume 5.0 +
        OSVER=50
        ;;
    esac
    if [ "$with_debug" = "yes" ]; then
      CCDBG="-g"
      LDDBG="-g"
    else
      CCDBG="-DNDEBUG"
      LDDBG=""
    fi
    CC=gcc
    CFLAGS="$CCDBG -D_UNIX -D_BSD=$OSVER -Wall"
    CXX=g++
    CXXFLAGS=${CFLAGS}
    AR=ar
    ARFLAGS="-rc"
    LD=gcc
    LDFLAGS="$LDDBG"
    SYSLIBS=""
    LIBDB_LIB=""
    MYSQL_LIB="-lmysqlclient"
    ;;
  OpenBSD)
    # I'm guessing OpenBSD looks mostly like FreeBSD 4.x
    OSVER=40
    if [ "$with_debug" = "yes" ]; then
      CCDBG="-g"
      LDDBG="-g"
    else
      CCDBG="-DNDEBUG"
      LDDBG=""
    fi
    CC=gcc
    CFLAGS="$CCDBG -D_UNIX -D_BSD=$OSVER -Wall"
    CXX=g++
    CXXFLAGS=${CFLAGS}
    AR=ar
    ARFLAGS="-rc"
    LD=gcc
    LDFLAGS="$LDDBG"
    SYSLIBS=""
    LIBDB_LIB=""
    MYSQL_LIB="-lmysqlclient"
    ;;
  Darwin)
    # I'm guessing Darwin looks mostly like FreeBSD 4.x
    OSVER=40
    if [ "$with_debug" = "yes" ]; then
      CCDBG="-g"
      LDDBG="-g"
    else
      CCDBG="-DNDEBUG"
      LDDBG=""
    fi
    CC=cc
    CFLAGS="$CCDBG -D_UNIX -D_BSD=$OSVER -DNOLOCK -Wall"
    CXX=c++
    CXXFLAGS=${CFLAGS}
    AR=ar
    ARFLAGS="-rc"
    LD=cc
    LDFLAGS="$LDDBG"
    SYSLIBS=""
    LIBDB_LIB=""
    MYSQL_LIB="-lmysqlclient"
    ;;
  SunOS)
    case "$UNAME_R" in
      5.6)
        OSVER=56
        ;;
      5.7)
        OSVER=57
        ;;
      5.8)
        OSVER=58
        ;;
      *)
        # Assume 9.0+
        OSVER=59
        ;;
    esac
    # Prefer gcc to the native cc here because I haven't tested with the
    # native compiler yet.
    type gcc >/dev/null 2>&1
    if [ $? -eq 0 ]; then
      if [ "$with_debug" = "yes" ]; then
        CCDBG="-g"
        LDDBG="-g"
      else
        CCDBG="-DNDEBUG"
        LDDBG=""
      fi
      CC=gcc
      CFLAGS="$CCDBG -D_UNIX -D_SOLARIS=$OSVER -Wall"
      CXX=g++
      CXXFLAGS=${CFLAGS}
      LD=gcc
      LDFLAGS="$LDDBG"
    else
      if [ "$with_debug" = "yes" ]; then
        CCDBG="-g"
        LDDBG="-g"
      else
        CCDBG="-DNDEBUG"
        LDDBG=""
      fi
      CC=cc
      CFLAGS="-DNDEBUG -D_UNIX -D_SOLARIS=$OSVER"
      CXX=c++
      CXXFLAGS=${CFLAGS}
      LD=ld
      LDFLAGS=""
    fi
    AR=ar
    ARFLAGS="-rc"
    SYSLIBS=""
    LIBDB_LIB="-ldb"
    MYSQL_LIB="-lmysqlclient"
    ;;
  OSF1)
    if [ "$with_debug" = "yes" ]; then
      CCDBG="-g2"
      LDDBG="-g2"
    else
      CCDBG="-DNDEBUG"
      LDDBG=""
    fi
    CC=cc
    CFLAGS="$CCDBG -D_UNIX -D_OSF"
    CXX=cxx
    CXXFLAGS="-noexceptions ${CFLAGS}"
    AR=ar
    ARFLAGS="-rc"
    LD=ld
    LDFLAGS=""
    SYSLIBS="-lm"
    LIBDB_LIB="-ldb"
    MYSQL_LIB="-lmysqlclient"
    ;;
  *)
    if [ "$with_debug" = "yes" ]; then
      CCDBG="-g"
      LDDBG="-g"
    else
      CCDBG="-DNDEBUG"
      LDDBG=""
    fi
    CC=cc
    CFLAGS="$CCDBG -DNDEBUG -D_UNIX"
    CXX=c++
    CXXFLAGS=${CFLAGS}
    AR=ar
    ARFLAGS="-rc"
    LD=ld
    LDFLAGS="$LDDBG"
    SYSLIBS=""
    LIBDB_LIB="-ldb"
    MYSQL_LIB="-lmysqlclient"
    ;;
esac

echo -n "Looking for compiler... "
type $CC >/dev/null 2>&1
if [ $? -ne 0 ]; then
  echo "compiler '$CC' not found!"
  exit 1
else
  echo "$CC is executable."
fi

echo -n "Checking for BerkeleyDB... "
if [ "$with_libdb" = "test" ]; then
  if [ -e /usr/local/BerkeleyDB.4.1/include/db.h ]; then
    with_libdb=/usr/local/BerkeleyDB.4.1
    LIBDB_LIB="-ldb"
  elif [ -e /usr/include/db.h -o \
       -e /usr/local/include/db.h ]; then
    with_libdb=yes
  else
    with_libdb=no
  fi
fi
if [ "$with_libdb" = "no" ]; then
  echo "disabled."
else
  if [ "$with_libdb" != "yes" ]; then
    CFLAGS="$CFLAGS -I$with_libdb/include"
    LDFLAGS="$LDFLAGS -L$with_libdb/lib"
  fi
  CFLAGS="$CFLAGS -DHAVE_LIBDB"
  LDFLAGS="$LDFLAGS $LIBDB_LIB"
  echo "enabled."
fi

echo -n "Checking for MySQL... "
if [ "$with_mysql" = "test" ]; then
  type mysql_config >/dev/null 2>&1
  if [ $? -eq 0 ]; then
    with_mysql=yes
    CFLAGS="$CFLAGS `mysql_config --cflags`"
    LDFLAGS="$LDFLAGS `mysql_config --libs`"
    # mysql_config will add -lmysqlclient, don't add it twice
    MYSQL_LIB=""
  else
    with_mysql=no
  fi
fi
if [ "$with_mysql" = "no" ]; then
  echo "disabled."
else
  if [ "$with_mysql" != "yes" ]; then
    CFLAGS="$CFLAGS -I$with_mysql/include"
    LDFLAGS="$LDFLAGS -L$with_mysql/lib"
  fi
  CFLAGS="$CFLAGS -DHAVE_MYSQL"
  LDFLAGS="$LDFLAGS $MYSQL_LIB"
  echo "enabled."
fi

for D in .; do
  cat $D/Makefile.in | sed "s%@CC@%${CC}%g
	s%@CXX@%${CXX}%g
	s%@AR@%${AR}%g
	s%@LD@%${LD}%g
	s%@CFLAGS@%${CFLAGS}%g
	s%@CXXFLAGS@%${CXXFLAGS}%g
	s%@ARFLAGS@%${ARFLAGS}%g
	s%@LDFLAGS@%${LDFLAGS}%g
	s%@SYSLIBS@%${SYSLIBS}%" > $D/Makefile || exit 1
done

echo "Configuration successful."
echo "Now run 'make all' and 'make install'."
echo ""