[latex3-commits] [git/LaTeX3-latex3-latex2e] gh963: Correctly show environments with \end part undefined (b7ea9ec4)

[PhelypeOleinik]

Repository : https://github.com/latex3/latex2e
On branch  : gh963
Link       : https://github.com/latex3/latex2e/commit/b7ea9ec4972845e787dad129e0903610811a9efe

>---------------------------------------------------------------

commit b7ea9ec4972845e787dad129e0903610811a9efe
Author: PhelypeOleinik <phelype.oleinik at latex-project.org>
Date:   Tue Nov 29 00:53:39 2022 -0300

    Correctly show environments with \end part undefined


>---------------------------------------------------------------

b7ea9ec4972845e787dad129e0903610811a9efe
 base/ltdefns.dtx | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/base/ltdefns.dtx b/base/ltdefns.dtx
index c66346c9..db7436b3 100644
--- a/base/ltdefns.dtx
+++ b/base/ltdefns.dtx
@@ -1861,21 +1861,26 @@
     \csname\@expl at cs@to at str@@N#1 \endcsname
   \@show at environment@end#1}
 \long\def\@show at environment@end#1{%
-  \expandafter\@show at normalenv@meaning
-    \csname end\@expl at cs@to at str@@N#1\endcsname
-    {\string\end{\@expl at cs@to at str@@N#1}:}}
+  \@ifundefined{end\@expl at cs@to at str@@N#1}%
+    {\@show at normalenv@undefined}%
+    {\expandafter\@show at normalenv@meaning
+       \csname end\@expl at cs@to at str@@N#1\endcsname}%
+      {\string\end{\@expl at cs@to at str@@N#1}}}
 %    \end{macrocode}
 % \end{macro}
 %
 %    \begin{macrocode}
 \long\def\@show at normalenv#1{%
   \@show at normalenv@meaning#1%
-    {\string\begin{\@expl at cs@to at str@@N#1}=environment:}%
+    {\string\begin{\@expl at cs@to at str@@N#1}=environment}%
   \@show at environment@end#1}
 \def\@show at normalenv@meaning#1#2{%
-  \edef\reserved at a{#2^^J%
+  \edef\reserved at a{#2:^^J%
     \@expl at cs@argument at spec@@N#1->\@expl at cs@replacement at spec@@N#1}%
   \showtokens\expandafter\expandafter\expandafter{\expandafter\reserved at a}}
+\def\@show at normalenv@undefined#1{%
+  \edef\reserved at a{#1=undefined}%
+  \showtokens\expandafter\expandafter\expandafter{\expandafter\reserved at a}}
 %    \end{macrocode}
 %
 %   Now the rollback code.