dnl -*- mode: Autoconf; -*-

dnl ----------------------------------------------------------------------------
dnl --SECTION--                                                         READLINE
dnl ----------------------------------------------------------------------------

AC_MSG_NOTICE([--------------------------------------------------------------------------------])
AC_MSG_NOTICE([CHECKING FOR READLINE])
AC_MSG_NOTICE([--------------------------------------------------------------------------------])

AC_LANG(C)

AC_ARG_ENABLE(readline,
  AS_HELP_STRING([--enable-readline], [enable readline support (default: yes)]),
  tr_READLINE="$enableval",
  tr_READLINE="maybe"
)

AC_ARG_WITH(readline,
  AS_HELP_STRING([--with-readline=DIR], [where the readline library and includes are located]),
  [READLINE_CPPFLAGS="-I$withval/include"
   READLINE_LDFLAGS="-L$withval/lib"
   READLINE="$withval"]
)

AC_ARG_WITH(readline-lib,
  AS_HELP_STRING([--with-readline-lib=DIR], [where the readline library is located]),
  [READLINE_LDFLAGS="-L$withval"]
)

dnl ----------------------------------------------------------------------------
dnl checks for the READLINE library
dnl ----------------------------------------------------------------------------

if test "x$READLINE_CPPFLAGS" != x;  then
  TR_INCLUDE([READLINE_CPPFLAGS])
fi

dnl ----------------------------------------------------------------------------
dnl save flags
dnl ----------------------------------------------------------------------------

SAVE_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $READLINE_CPPFLAGS"

SAVE_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS $READLINE_LDFLAGS"

SAVE_LIBS="$LIBS"

dnl ----------------------------------------------------------------------------
dnl check for header and library
dnl ----------------------------------------------------------------------------

if test "x$tr_READLINE" = xyes -o "x$tr_READLINE" = xmaybe;  then
  ch_READLINE="$tr_READLINE"

  AC_CHECK_HEADERS(readline/readline.h, [tr_READLINE="yes"], [tr_READLINE="no"])

  if test "x$tr_READLINE" = xyes;  then
    AC_CHECK_LIB([readline], [readline], [READLINE_LIBS="-lreadline" tr_READLINE="yes"], [tr_READLINE="no"])
  fi

  if test "x$tr_READLINE" != xyes;  then
    if test "x$ch_READLINE" = xyes;  then
      AC_MSG_ERROR([Please install readline support])
    fi
  fi
fi

if test "x$tr_READLINE" = xno;  then
  AC_MSG_ERROR([Please install readline support])
fi

dnl ----------------------------------------------------------------------------
dnl grep readline version number
dnl ----------------------------------------------------------------------------

if test "x$tr_READLINE" = xyes;  then

cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h.  */
#include <readline/readline.h>

main () {
#if defined(RL_VERSION_MAJOR) && defined(RL_VERSION_MINOR)
  long sdnhg36ed = RL_VERSION_MAJOR RL_VERSION_MINOR ;
#else
  long sdnhg36ed = RL_READLINE_VERSION hex ;
#endif
}

_ACEOF
AC_MSG_CHECKING([READLINE version])
eval "$ac_cpp conftest.$ac_ext" | fgrep "long sdnhg36ed" | awk '{print $4 "." $5}' > conftest.output
TRI_READLINE_VERSION=`cat conftest.output`

if test -z "$TRI_READLINE_VERSION"; then
  AC_MSG_ERROR([Readline support is not working. Please re-install readline support])
fi

AC_MSG_RESULT([$TRI_READLINE_VERSION])
rm -f conftest*

fi

dnl ----------------------------------------------------------------------------
dnl restore flags
dnl ----------------------------------------------------------------------------

LIBS="$SAVE_LIBS"
LDFLAGS="$SAVE_LDFLAGS"
CPPFLAGS="$SAVE_CPPFLAGS"

if test "x$tr_READLINE" = xyes;  then
  CPPFLAGS="$CPPFLAGS -DHAVE_READLINE=1"
  READLINE_CPPFLAGS="${READLINE_CPPFLAGS} -DTRI_READLINE_VERSION='\"${TRI_READLINE_VERSION}\"'"
fi

dnl ----------------------------------------------------------------------------
dnl add substitutions
dnl ----------------------------------------------------------------------------

AM_CONDITIONAL(ENABLE_READLINE, test "x$tr_READLINE" = xyes)

AC_SUBST(READLINE_CPPFLAGS)
AC_SUBST(READLINE_LDFLAGS)
AC_SUBST(READLINE_LIBS)

dnl ----------------------------------------------------------------------------
dnl informational output
dnl ----------------------------------------------------------------------------

if test "x$tr_READLINE" = xyes;  then
  LIB_INFO="$LIB_INFO|READLINE VERSION: ${TRI_READLINE_VERSION}"

  LIB_INFO="$LIB_INFO|READLINE_CPPLIBS: ${READLINE_CPPLIBS}"
  LIB_INFO="$LIB_INFO|READLINE_LDLIBS:  ${READLINE_LDLIBS}"
  LIB_INFO="$LIB_INFO|READLINE_LIBS:     ${READLINE_LIBS}"
else
  LIB_INFO="$LIB_INFO|READLINE VERSION: disabled"
fi

LIB_INFO="$LIB_INFO|."

dnl ----------------------------------------------------------------------------
dnl --SECTION--                                                      END-OF-FILE
dnl ----------------------------------------------------------------------------

dnl Local Variables:
dnl mode: outline-minor
dnl outline-regexp: "^\\(dnl --SECTION--\\)"
dnl End: