# Configure check for Ruby
# Kenta MURATA <muraken2 / nifty.com>

dnl AM_CHECK_RUBY([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
dnl Test for Ruby, and define RUBY_CFLAGS, RUBY_LIBS, RUBY_LDSHARED, RUBY_DLEXT,
dnl ruby_libdir, ruby_archdir, ruby_sitelibdir and ruby_sitearchdir
dnl
AC_DEFUN([AM_CHECK_RUBY],
[dnl
dnl Get the cflags and libraries from the rbconfig.rb
dnl

  save_CFLAGS=$CFLAGS
  save_LIBS=$LIBS

  AC_PATH_PROG(RUBY, ruby, no)
  if test "$RUBY" = "no";
  then
    AC_MSG_ERROR([*** ruby is not found.])
  fi

  
  minimum_version=ifelse([$1], ,1.4.4, $1)
  AC_MSG_CHECKING([for Ruby - version >= $minimum_version])
  ruby_major_version=`$RUBY -e "print RUBY_VERSION.split('.')[[0]]"`
  ruby_minor_version=`$RUBY -e "print RUBY_VERSION.split('.')[[1]]"`
  ruby_micro_version=`$RUBY -e "print RUBY_VERSION.split('.')[[2]]"`
  if `$RUBY -e "
      major_version = RUBY_VERSION.split('.')[[0]].to_i
      minor_version = RUBY_VERSION.split('.')[[1]].to_i
      micro_version = RUBY_VERSION.split('.')[[2]].to_i
      min_major_version = '$minimum_version'.split('.')[[0]].to_i
      min_minor_version = '$minimum_version'.split('.')[[1]].to_i
      min_micro_version = '$minimum_version'.split('.')[[2]].to_i
      if ((major_version > min_major_version) ||
          ((major_version == min_major_version) &&
           (minor_version > min_minor_version)) ||
          ((major_version == min_major_version) &&
           (minor_version == min_minor_version) &&
           (micro_version > min_micro_version))) then
        exit 1
      end
      exit 0"`; then
    AC_MSG_RESULT([no])
    AC_MSG_ERROR([*** Ruby version is smaller.])
  fi
  AC_MSG_RESULT([yes])

  ruby_libdir=`$RUBY -r rbconfig -e "puts Config::CONFIG[['rubylibdir']]"`
  ruby_archdir=`$RUBY -r rbconfig -e "puts Config::CONFIG[['archdir']]"`
  ruby_hdrdir=`$RUBY -r rbconfig -e "puts Config::CONFIG[['rubyhdrdir']]"`
  ruby_sitelibdir=`$RUBY -r rbconfig -e "puts Config::CONFIG[['sitelibdir']]"`
  ruby_sitearchdir=`$RUBY -r rbconfig -e "puts Config::CONFIG[['sitearchdir']]"`
  ruby_hdrarchdir=$ruby_hdrdir/`$RUBY -r rbconfig -e "puts Config::CONFIG[['arch']]"`

  CFLAGS=`$RUBY -r rbconfig -e "puts Config::CONFIG[['CCDLFLAGS']]"`
  RUBY_CFLAGS="$RUBY_CFLAGS $CFLAGS"
  CFLAGS=`$RUBY -r rbconfig -e "puts Config::CONFIG[['CFLAGS']]"`
  RUBY_CFLAGS="$RUBY_CFLAGS $CFLAGS"
  if test -e "$ruby_archdir/ruby.h"; then
    RUBY_CFLAGS="$RUBY_CFLAGS -I$ruby_archdir";
  else
    if test -e "$ruby_hdrdir/ruby.h"; then
      RUBY_CFLAGS="$RUBY_CFLAGS -I$ruby_hdrdir";
    else
      AC_MSG_ERROR([*** can't find header files for ruby.])
    fi
  fi
  if test -e "$ruby_hdrarchdir/ruby/config.h"; then
    RUBY_CFLAGS="$RUBY_CFLAGS -I$ruby_hdrarchdir"
  fi
  RUBY_LDSHARED=`$RUBY -r rbconfig -e "puts Config::CONFIG[['LDSHARED']]"`
  LIBS=`$RUBY -r rbconfig -e "puts Config::CONFIG[['LDFLAGS']]"`
  RUBY_LIBS="$RUBY_LIBS $LIBS"
  LIBS=`$RUBY -r rbconfig -e "puts Config::CONFIG[['DLDFLAGS']]"`
  RUBY_LIBS="$RUBY_LIBS $LIBS"
  RUBY_DLEXT=`$RUBY -r rbconfig -e "puts Config::CONFIG[['DLEXT']]"`

  CLFAGS=$save_CFLAGS
  LIBS=$save_LIBS

  AC_SUBST(RUBY_CFLAGS)
  AC_SUBST(RUBY_LIBS)
  AC_SUBST(RUBY_DLEXT)
  AC_SUBST(RUBY_LDSHARED)
  AC_SUBST(ruby_libdir)
  AC_SUBST(ruby_archdir)
  AC_SUBST(ruby_sitelibdir)
  AC_SUBST(ruby_sitearchdir)
  AC_SUBST(ruby_hdrdir)
  AC_SUBST(ruby_hdrarchdir)
])