dnl ===========================================================================
dnl Additional macros used to configure GiNaC.  We don't start our own 
dnl additions' names with AC_ but with GINAC_ in order to steer clear of
dnl future trouble.
dnl ===========================================================================

dnl Usage: GINAC_TERMCAP
dnl libreadline is based on the termcap functions.
dnl Some systems have tgetent(), tgetnum(), tgetstr(), tgetflag(), tputs(),
dnl tgoto() in libc, some have it in libtermcap, some have it in libncurses.
dnl When both libtermcap and libncurses exist, we prefer the latter, because
dnl libtermcap is being phased out.
AC_DEFUN(GINAC_TERMCAP,
[LIBTERMCAP=
AC_CHECK_FUNCS(tgetent)
if test "x$ac_cv_func_tgetent" = "xyes"; then
    :
else
    AC_CHECK_LIB(ncurses, tgetent, LIBTERMCAP="-lncurses")
    if test -z "$LIBTERMCAP"; then
        AC_CHECK_LIB(termcap, tgetent, LIBTERMCAP="-ltermcap")
    fi
fi
AC_SUBST(LIBTERMCAP)
])

dnl Usage: GINAC_ERROR(message)
dnl This macro displays the warning "message" and sets the flag ginac_error
dnl to yes.
AC_DEFUN(GINAC_ERROR,[
ginac_error_txt="$ginac_error_txt
** $1
"
ginac_error=yes])

dnl Usage: GINAC_WARNING(message)
dnl This macro displays the warning "message" and sets the flag ginac_warning
dnl to yes.
AC_DEFUN(GINAC_WARNING,[
ginac_warning_txt="$ginac_warning_txt
== $1
"
ginac_warning=yes])

dnl Usage: GINAC_CHECK_ERRORS
dnl (preferably to be put at end of configure.in)
dnl This macro displays a warning message if GINAC_ERROR or GINAC_WARNING 
dnl has occured previously.
AC_DEFUN(GINAC_CHECK_ERRORS,[
if test "x${ginac_error}" = "xyes"; then
    echo "**** The following problems have been detected by configure."
    echo "**** Please check the messages below before running \"make\"."
    echo "**** (see the section 'Common Problems' in the INSTALL file)"
    echo "$ginac_error_txt"
    if test "x${ginac_warning_txt}" != "x"; then
        echo "${ginac_warning_txt}"
    fi
    echo "deleting cache ${cache_file}"
    rm -f $cache_file
    else 
        if test x$ginac_warning = xyes; then
            echo "=== The following minor problems have been detected by configure."
            echo "=== Please check the messages below before running \"make\"."
            echo "=== (see the section 'Common Problems' in the INSTALL file)"
            echo "$ginac_warning_txt"
        fi
    echo "Configuration of GiNaC $VERSION done. Now type \"make\"."
fi])