# ===========================================================================
#       URL
# ===========================================================================
#
# SYNOPSIS
#
#   AX_CHECK_YAJL()
#
# DESCRIPTION
#
#
# LICENSE
#
#   Copyright (c) 2011 Boris Manojlovic <boris@steki.net>
#
#   This program is free software; you can redistribute it and/or modify it
#   under the terms of the GNU General Public License as published by the
#   Free Software Foundation; either version 2 of the License, or (at your
#   option) any later version.
#
#   This program is distributed in the hope that it will be useful, but
#   WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
#   Public License for more details.
#
#   You should have received a copy of the GNU General Public License along
#   with this program. If not, see <http://www.gnu.org/licenses/>.
#
#   As a special exception, the respective Autoconf Macro's copyright owner
#   gives unlimited permission to copy, distribute and modify the configure
#   scripts that are the output of Autoconf when processing the Macro. You
#   need not follow the terms of the GNU General Public License when using
#   or distributing such scripts, even though portions of the text of the
#   Macro appear in them. The GNU General Public License (GPL) does govern
#   all other use of the material that constitutes the Autoconf Macro.
#
#   This special exception to the GPL applies to versions of the Autoconf
#   Macro released by the Autoconf Archive. When you make and distribute a
#   modified version of the Autoconf Macro, you may extend this special
#   exception to the GPL to apply to your modified version as well.

#serial 1

AU_ALIAS([CHECK_YAJL], [AX_CHECK_YAJL])
AC_DEFUN([AX_CHECK_YAJL],
#
# Handle user hints
#
[AC_ARG_WITH(yajl,
[
  --with-yajl=DIR root directory path of yajl installation [defaults to
                    /usr/local or /usr if not found in /usr/local]
  --without-yajl to disable yajl usage completely],
[
if test "$withval" != "no"; then
	if test -d "$withval" ; then
		WANT_YAJL="yes"
		yajl_places="$withval"
	else
		AC_MSG_WARN([Sorry, $withval does not exist])
	fi
fi
],[
dnl just provide default places where it most probably could be found
yajl_places="/usr/local /usr /opt/local /sw"
])

#
# Locate yajl
#

if test -n "$yajl_places" ; then
	# check the user supplied or any other more or less 'standard' place:
	for YAJL_HOME in ${yajl_places} ; do
	  if test -f "${YAJL_HOME}/include/yajl/yajl_parse.h"; then break; fi
	  YAJL_HOME=""
	done

	# if yajl.h was nowhere to be found, give a notice and bail out
	if test ! -n "${YAJL_HOME}"; then
          AC_MSG_ERROR(No yajl.h in any include directory of ${yajl_places}: either specify a valid yajl installation with --with-yajl=DIR or disable yajl usage with --without-yajl)
	fi

        AC_LANG_SAVE
        AC_LANG_C
        AC_CHECK_LIB(yajl, yajl_parse, [yajl_cv_libyajl=yes], [yajl_cv_libyajl=no])
        AC_CHECK_HEADER(yajl/yajl_parse.h, [yajl_cv_yajl_parse_h=yes], [yajl_cv_yajl_parse_h=no])
        AC_LANG_RESTORE
	YAJL_LIBS="-lyajl"
	YAJL_CFLAGS="-I${YAJL_HOME}/include"
        if test "$yajl_cv_libyajl" != "yes" -a "$yajl_cv_yajl_parse_h" != "yes"
        then
                # If either header or library was not found, revert and bomb
                AC_MSG_ERROR(either specify a valid yajl installation with --with-yajl=DIR or disable yajl usage with --without-yajl)
        fi
fi
AC_SUBST(YAJL_LIBS)
AC_SUBST(YAJL_CFLAGS)
AC_SUBST(YAJL_LDFLAGS) dnl no really use for this library
])