[tex-live] tl-pretest: bug in .ini files

[Petr Olsak]

Hello,

I started with experimenting with tl-pretest and I have found that the 
pdftexcofig.tex file is generally changed. I know that this is common 
Parkinson's law that sowtware is more and more complicated (without 
exlicit needs). This is exactly such example.

A pdfTeX user is not interested that LuaTeX changed its primitives. This 
is LuaTeX problem, not pdfTeX problem. And pdftexconfig.tex is used 
primary in .ini files by pdfTeX. So, more good approach is to keep 
pdftexconfig.tex unchanged and only luatexiniconfig.tex should be adapted 
in order to share the same values given in pdftexconfig.tex. We need not 
to create any new file like pdftexconfig.dat.

Now, the bug description: The \unless primitive cannot be used in the 
pdftexconfig.tex file because there are people they generate pdftex 
format without initializing eTeX. One way to fix this bug is such file:

--------------------------------------------------------------------

% tex-ini-files 2016-02-27: pdftexconfig.tex

% Load shared (PDF) settings in pdfTeX

% This needs a bit of work to read the file line-by-line
\begingroup
   \catcode`\{=1 %
   \catcode`\}=2 %
   \catcode`\#=6 %
   % From apnum.tex
   \def\loop#1\repeat{\def\body{#1\relax\expandafter\body\fi}\body}%
   \let\repeat\fi
   % The format of the data lines themselves is simple
   \def\parse#1 = #2\relax{\expandafter\global\csname pdf#1\endcsname = #2 
}%
   \def\storedpar{\par}%
   % Read the raw data
   \openin0=pdftexconfig.dat %
   \loop\ifeof0 \else
     \read0 to \line
     \ifx\line\storedpar\else
       \if\relax\line\relax
       \else
         \expandafter\parse\line\relax
       \fi
     \fi
   \repeat
\endgroup

\global\pdfoutput = \ifx\dvimode\undefined 1\else 0\fi\relax
\global\let\dvimode\undefined

\endinput

------------------------------------------------------------

But better correction is to keep the pdftexconfig.tex unchanged.

Best regards

Petr Olsak