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-rw-r--r--Master/texmf-dist/source/latex/l3kernel/l3sys.dtx31
1 files changed, 29 insertions, 2 deletions
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3sys.dtx b/Master/texmf-dist/source/latex/l3kernel/l3sys.dtx
index a25c0867af0..46263e0b2cd 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3sys.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3sys.dtx
@@ -43,7 +43,7 @@
% }^^A
% }
%
-% \date{Released 2022-07-15}
+% \date{Released 2022-08-05}
%
% \maketitle
%
@@ -290,9 +290,25 @@
% use will be loaded. This command may only be used once.
% \end{function}
%
+% \begin{function}[added = 2022-07-29]{\sys_ensure_backend:}
+% \begin{syntax}
+% \cs{sys_ensure_backend:}
+% \end{syntax}
+% Ensures that a backend has been loaded by calling \cs{sys_load_backend:n}
+% if required.
+% \end{function}
+%
% \begin{variable}{\c_sys_backend_str}
% Set to the name of the backend in use by \cs{sys_load_backend:n} when
-% issued.
+% issued. Possible values are
+% \begin{itemize}
+% \item \texttt{pdftex}
+% \item \texttt{luatex}
+% \item \texttt{xetex}
+% \item \texttt{dvips}
+% \item \texttt{dvipdfmx}
+% \item \texttt{dvisvgm}
+% \end{itemize}
% \end{variable}
%
% \begin{function}[added = 2019-09-12]{\sys_load_debug:}
@@ -561,6 +577,17 @@
% \end{macro}
% \end{macro}
%
+% \begin{macro}{\sys_ensure_backend:}
+% A simple wrapper.
+% \begin{macrocode}
+\cs_new_protected:Npn \sys_ensure_backend:
+ {
+ \str_if_exist:NF \c_sys_backend_str
+ { \sys_load_backend:n { } }
+ }
+% \end{macrocode}
+% \end{macro}
+%
% \begin{variable}{\g_@@_debug_bool}
% \begin{macrocode}
\bool_new:N \g_@@_debug_bool