dnl Check for LUA Libraries

dnl CHECK_LUA(ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])

dnl Sets:

dnl  LUA_CFLAGS

dnl  LUA_LIBS

AC_DEFUN([CHECK_LUA],

[dnl

AC_REQUIRE([PKG_PROG_PKG_CONFIG])

LUA_CONFIG=""

LUA_VERSION=""

LUA_CFLAGS=""

LUA_CPPFLAGS=""

LUA_LDADD=""

LUA_LDFLAGS=""

LUA_CONFIG=${PKG_CONFIG}

LUA_PKGNAMES="lua5.1 lua-5.1 lua_5.1 lua-51 lua_51 lua51 lua5 lua lua5.2 lua-5.2 lua_5.2 lua-52 lua_52 lua52 lua5.3 lua-5.3 lua_5.3 lua-53 lua_53 lua53 "

LUA_SONAMES="so la sl dll dylib a"

AC_ARG_WITH(

    lua,

    [AC_HELP_STRING([--with-lua=PATH],[Path to lua prefix or config script])]

    ,, with_lua=yes)

AS_CASE(["${with_lua}"],

  [no], [test_paths=],

  [yes], [test_paths="/usr/local/liblua /usr/local/lua /usr/local /opt/liblua /opt/lua /opt /usr"],

  [test_paths="${with_lua}"])

AS_IF([test "x${test_paths}" != "x"], [

AC_MSG_CHECKING([for liblua config script])

for x in ${test_paths}; do

    dnl # Determine if the script was specified and use it directly

    if test ! -d "$x" -a -e "$x"; then

        LUA_CONFIG=$x

        break

    fi

    dnl # Try known config script names/locations

    for y in $LUA_CONFIG; do

        if test -e "${x}/bin/${y}"; then

            LUA_CONFIG="${x}/bin/${y}"

            lua_config="${LUA_CONFIG}"

            break

        elif test -e "${x}/${y}"; then

            LUA_CONFIG="${x}/${y}"

            lua_config="${LUA_CONFIG}"

            break

        fi

    done

    if test -n "${lua_config}"; then

        break

    fi

done

dnl # Try known package names

if test -n "${LUA_CONFIG}"; then

    LUA_PKGNAME=""

    for x in ${LUA_PKGNAMES}; do

        if ${LUA_CONFIG} --exists ${x}; then

            LUA_PKGNAME="$x"

            break

        fi

    done

fi

if test -n "${LUA_PKGNAME}"; then

    AC_MSG_RESULT([${LUA_CONFIG}])

    LUA_VERSION="`${LUA_CONFIG} ${LUA_PKGNAME} --modversion`"

    if test "$verbose_output" -eq 1; then AC_MSG_NOTICE(lua VERSION: $LUA_VERSION); fi

    LUA_CFLAGS="`${LUA_CONFIG} ${LUA_PKGNAME} --cflags`"

    if test "$verbose_output" -eq 1; then AC_MSG_NOTICE(lua CFLAGS: $LUA_CFLAGS); fi

    LUA_LDADD="`${LUA_CONFIG} ${LUA_PKGNAME} --libs-only-l`"

    if test "$verbose_output" -eq 1; then AC_MSG_NOTICE(lua LDADD: $LUA_LDADD); fi

    LUA_LDFLAGS="`${LUA_CONFIG} ${LUA_PKGNAME} --libs-only-L --libs-only-other`"

    if test "$verbose_output" -eq 1; then AC_MSG_NOTICE(lua LDFLAGS: $LUA_LDFLAGS); fi

else

    AC_MSG_RESULT([no])

    dnl Hack to just try to find the lib and include

    AC_MSG_CHECKING([for lua install])

    for x in ${test_paths}; do

        for y in ${LUA_SONAMES}; do

            if test -e "${x}/liblua5.1.${y}"; then

                lua_lib_path="${x}"

                lua_lib_name="lua5.1"

                break

            elif test -e "${x}/lib/liblua5.1.${y}"; then

                lua_lib_path="${x}/lib"

                lua_lib_name="lua5.1"

                break

            elif test -e "${x}/lib64/liblua5.1.${y}"; then

                lua_lib_path="${x}/lib64"

                lua_lib_name="lua5.1"

                break

            elif test -e "${x}/lib32/liblua5.1.${y}"; then

                lua_lib_path="${x}/lib32"

                lua_lib_name="lua5.1"

                break

            elif test -e "${x}/liblua51.${y}"; then

                lua_lib_path="${x}"

                lua_lib_name="lua51"

                break

            elif test -e "${x}/lib/liblua51.${y}"; then

                lua_lib_path="${x}/lib"

                lua_lib_name="lua51"

                break

            elif test -e "${x}/lib64/liblua51.${y}"; then

                lua_lib_path="${x}/lib64"

                lua_lib_name="lua51"

                break

            elif test -e "${x}/lib32/liblua51.${y}"; then

                lua_lib_path="${x}/lib32"

                lua_lib_name="lua51"

                break

            elif test -e "${x}/liblua.${y}"; then

                lua_lib_path="${x}"

                lua_lib_name="lua"

                break

            elif test -e "${x}/lib/liblua.${y}"; then

                lua_lib_path="${x}/lib"

                lua_lib_name="lua"

                break

            elif test -e "${x}/lib64/liblua.${y}"; then

                lua_lib_path="${x}/lib64"

                lua_lib_name="lua"

                break

            elif test -e "${x}/lib32/liblua.${y}"; then

                lua_lib_path="${x}/lib32"

                lua_lib_name="lua"

                break

            else

                lua_lib_path=""

                lua_lib_name=""

            fi

        done

        if test -n "$lua_lib_path"; then

            break

        fi

    done

    for x in ${test_paths}; do

        if test -e "${x}/include/lua.h"; then

            lua_inc_path="${x}/include"

            break

        elif test -e "${x}/lua.h"; then

            lua_inc_path="${x}"

            break

        fi

        dnl # Check some sub-paths as well

        for lua_pkg_name in ${lua_lib_name} ${LUA_PKGNAMES}; do

            if test -e "${x}/include/${lua_pkg_name}/lua.h"; then

                lua_inc_path="${x}/include"

                break

            elif test -e "${x}/${lua_pkg_name}/lua.h"; then

                lua_inc_path="${x}"

                break

            else

                lua_inc_path=""

            fi

        done

        if test -n "$lua_inc_path"; then

            break

        fi

    done

    if test -n "${lua_lib_path}" -a -n "${lua_inc_path}"; then

        LUA_CONFIG=""

        AC_MSG_RESULT([${lua_lib_path} ${lua_inc_path}])

        LUA_VERSION="5.1"

        LUA_CFLAGS="-I${lua_inc_path}"

        LUA_LDADD="-l${lua_lib_name}"

        LUA_LDFLAGS="-L${lua_lib_path}"

    else

        LUA_VERSION=""

        AC_MSG_RESULT([no])

    fi

fi

])

AC_SUBST(LUA_CFLAGS)

AC_SUBST(LUA_LDADD)

AC_SUBST(LUA_LDFLAGS)

    if test -z "${LUA_VERSION}"; then

      ifelse([$2], , AC_MSG_NOTICE([optional lua library not found]), $2)

    else

      AC_MSG_NOTICE([using lua v${LUA_VERSION}])

      LUA_CFLAGS="-DWITH_LUA ${LUA_CFLAGS}"

      ifelse([$1], , , $1) 

    fi 

])