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-rw-r--r--Master/texmf-dist/source/latex/base/ltbibl.dtx41
1 files changed, 37 insertions, 4 deletions
diff --git a/Master/texmf-dist/source/latex/base/ltbibl.dtx b/Master/texmf-dist/source/latex/base/ltbibl.dtx
index cda0fa160ad..4c219657b87 100644
--- a/Master/texmf-dist/source/latex/base/ltbibl.dtx
+++ b/Master/texmf-dist/source/latex/base/ltbibl.dtx
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 1993-2021
+% Copyright (C) 1993-2022
% The LaTeX Project and any individual authors listed elsewhere
% in this file.
%
@@ -32,7 +32,7 @@
%<*driver>
% \fi
\ProvidesFile{ltbibl.dtx}
- [2020/12/10 v1.1s LaTeX Kernel (Bibliography)]
+ [2022/03/10 v1.1t LaTeX Kernel (Bibliography)]
% \iffalse
\documentclass{ltxdoc}
\GetFileInfo{ltbibl.dtx}
@@ -106,7 +106,7 @@
% |\nocite{*}| is special: it tells \BibTeX{} to put the whole of a
% collection of references into the bibliography.
%
-% \StopEventually{}
+% \MaybeStop{}
%
%
% \changes{v1.0a}{1994/03/31}{Initial version of ltidxbib.dtx,
@@ -199,8 +199,41 @@
% \begin{macro}{\cite}
% \changes{v1.1j}{1995/10/16}{(DPC) Make robust}
% \begin{macrocode}
+%</2ekernel>
+%<*2ekernel|latexrelease>
+%<latexrelease>\IncludeInRelease{2022/06/01}%
+%<latexrelease> {\cite}{check for blank}%
\DeclareRobustCommand\cite{%
- \@ifnextchar [{\@tempswatrue\@citex}{\@tempswafalse\@citex[]}}
+ \@ifnextchar [{\@tempswatrue\@citex@checkblank}{\@tempswafalse\@citex@checkblank[]}}
+% \end{macrocode}
+% Due to the way \cs{@for} as used in \cs{@citex} behaves an empty
+% argument to \cs{cite} did not produce any warning for a missing
+% citation. So we now inject a command before calling \cs{@citex} that
+% does the checking for us. It is not done in \cs{@citex} directly,
+% because that command is altered by a number of packages/classes
+% and this way it is more likely that the check survives.
+% \changes{v1.1t}{2022/03/10}{Ensure that an empty argument generates
+% a warning (gh/790)}
+% \begin{macrocode}
+\def\@citex@checkblank[#1]#2{%
+ \IfBlankTF {#2}%
+ {\@citex[#1]{\space}}%
+ {\@citex[#1]{#2}}%
+}
+%</2ekernel|latexrelease>
+% \end{macrocode}
+%
+% \begin{macrocode}
+%<latexrelease>\EndIncludeInRelease
+%<latexrelease>\IncludeInRelease{0000/00/00}%
+%<latexrelease> {\cite}{check for blank}%
+%<latexrelease>
+%<latexrelease>\DeclareRobustCommand\cite{%
+%<latexrelease> \@ifnextchar [{\@tempswatrue\@citex}{\@tempswafalse\@citex[]}}
+%<latexrelease>\let\@citex@checkblank\@undefined
+%<latexrelease>
+%<latexrelease>\EndIncludeInRelease
+%<*2ekernel>
% \end{macrocode}
% \end{macro}
%