error if not luatex

1 files changed, 9 insertions, 6 deletions

diff --git a/luatexbase-regs.dtx b/luatexbase-regs.dtx
index 08d1060..7146cd5 100644
--- a/luatexbase-regs.dtx
+++ b/luatexbase-regs.dtx
@@ -225,14 +225,17 @@ See source file '\inFileName' for details.
 \fi
 \ifluatex\else
   \begingroup
-    \expandafter\ifx\csname PackageWarningNoLine\endcsname\relax
-      \def\x#1#2{\begingroup\newlinechar10
-        \immediate\write16{Package #1 warning: #2}\endgroup}
+    \expandafter\ifx\csname PackageError\endcsname\relax
+      \def\x#1#2#3{\begingroup \newlinechar10
+        \errhelp{#3}\errmessage{Package #1 error: #2}\endgroup}
     \else
-      \let\x\PackageWarningNoLine
+      \let\x\PackageError
     \fi
   \expandafter\endgroup
-  \x{luatexbase-regs}{LuaTeX is required for this package. Aborting.}
+  \x{luatexbase-attr}{LuaTeX is required for this package. Aborting.}{%
+    This package can only be used with the LuaTeX engine^^J%
+    (command `lualatex' or `luatex').^^J%
+    Package loading has been stopped to prevent additional errors.}
   \lltxb@regs@AtEnd
   \expandafter\endinput
 \fi
@@ -267,7 +270,7 @@ See source file '\inFileName' for details.
       \let\x\PackageWarningNoLine
     \fi
   \expandafter\endgroup
-  \x{luatexbase-regs}{etex macros not loaded!^^J
+  \x{luatexbase-regs}{etex macros not loaded!^^J%
     Registers allocation scheme will not be extended.}
 \else
 %    \end{macrocode}