\everyjob and (u)platex-dev

[h-kitagawa]

Karl さんからのメールによると，pLaTeX バナーを出力するための \everyjob ハックが latex-dev 2023-06-01 pre-release 1 からうまくいかなくなるようです：

I hope the LaTeX people have already sent you many more details, but the
latest latex-dev release breaks platex-dev (engine eptex) and
uplatex-dev (engine euptex). Thus I've had to disable them temporarily
so the TL build could go through.

Apparently you have to change something on your side. Frank said:

> platex is hooking in a very low-level way into the \everyjob to add its 
> own banner and that fails now.

Here's the error from the TL build:

$ euptex -ini   -jobname=uplatex-dev -progname=uplatex-dev *uplatex.ini
This is e-upTeX, Version 3.141592653-p4.0.0-u1.28-220214-2.6 (utf8.uptex) (TeX Live 2022) (INITEX)
.. many lines omitted ...
(/home/ftp/tlnet-trial-221204-6866/tlinst.try/2022/texmf-dist/tex/platex/base/p
lcore.ltx
! Argument of \platexNILa has an extra }.
<inserted text> 
                \par 
l.52 ...ter\expandafter\expandafter{\platexBANNER}
                                                  %
? 
! Emergency stop.
<inserted text> 
                \par 
l.52 ...ter\expandafter\expandafter{\platexBANNER}
                                                  %

[h-kitagawa]

LaTeX 2023-06-01 pre1 の \everyjob を見ると，起動時のバナーは \LaTeXReleaseInfo というトークンレジスタに

\show@release@info {\fmtname \space <\fmtversion > ... }

という形式で保存される（ltvers.dtx のコミット）なので，この内容を書き換える方針で作ってみました．

--- /opt/texlive/2022/texmf-dist/tex/platex/base/plcore.ltx 2021-12-12 06:17:48.000000000 +0900
+++ plcore.ltx  2022-12-05 08:10:37.264901737 +0900
@@ -36,9 +36,6 @@
 \def\pfmtversion
    {2021-11-15}
 \def\ppatch@level{0}
-\edef\platexBANNER{\noexpand\platexNILa
-                   \the\everyjob % LaTeX banner and delayed codes
-                   \noexpand\platexNILb}
 \begingroup
   \ifnum\ppatch@level=0
     \toks2={\pfmtname\space<\pfmtversion>\space}%
@@ -47,11 +44,20 @@
   \else
     \toks2={\pfmtname\space<\pfmtversion>-pre\ppatch@level\space}%
   \fi\fi
-  \edef\platexNILa#1\typeout#2#3\platexNILb{%
-    #1\noexpand\typeout{\the\toks2 (based on #2)}#3}
-  \global\everyjob\expandafter\expandafter\expandafter{\platexBANNER}%
+  \ifdefined\LaTeXReleaseInfo % 2023-06-01
+    \edef\platexNILa#1\show@release@info#2#3\platexNILb{%
+      #1\noexpand\show@release@info{\the\toks2 (based on #2)}#3}%
+    \global\LaTeXReleaseInfo\expandafter\expandafter\expandafter{%
+      \expandafter\platexNILa\the\LaTeXReleaseInfo\platexNILb}
+  \else % 2022-11-15
+    \edef\platexBANNER{\noexpand\platexNILa
+                       \the\everyjob % LaTeX banner and delayed codes
+                       \noexpand\platexNILb}
+    \edef\platexNILa#1\typeout#2#3\platexNILb{%
+      #1\noexpand\typeout{\the\toks2 (based on #2)}#3}
+    \global\everyjob\expandafter\expandafter\expandafter{\platexBANNER}%
+  \fi
 \endgroup
-\let\platexBANNER=\@undefined
 \chardef\pltx@newhook@avail=\z@
 \@ifl@t@r\fmtversion{2020/10/01}{\chardef\pltx@newhook@avail=\@ne}{}
 \newif\if@plincludeinrelease

[FrankMittelbach]

Would it not be simpler to avoid taking the LaTeX release info apart but simply add the banner in front into the \LaTeXReleaseInfo toks? e.g., coming out like

  platex-BANNER  
  based on
  original-LaTeXReleaseInfo

without the attempt to find something like \show@release@info which is an internal implementation detail and thus might change. The above could be done easily by augmenting the toks.

[aminophen]

@h-kitagawa ありがとうございます。反映して本日リリースします。plvers.dtx は v1.2a にしました。