requires LaTeX2e 2017-04-15, general cleanup

plcore.ltx

@@ -16,6 +16,21 @@
 %% -------------------------------------------------------------
 %% 
 %% File: plvers.dtx
+\ifx\fmtversion\@undefined
+    \errhelp{Please reinstall LaTeX.}%
+    \errmessage{This cannot happen!^^JYour file `latex.ltx'
+                might be broken}\@@end
+\else
+  \ifnum\expandafter\@parse@version\fmtversion//00\@nil<20170415
+    \errhelp{Please update your TeX installation; if not available,
+             obtain it^^Jmanually from CTAN
+             (https://ctan.org/pkg/latex-base) or from^^JGitHub
+             (https://github.com/latex3/latex2e).}%
+    \errmessage{This version of pLaTeX2e requires LaTeX2e 2017-04-15
+                or newer!^^JObtain a newer version of `latex',
+                otherwise pLaTeX2e setup will^^Jnever succeed}\@@end
+  \fi
+\fi
 \def\pfmtname{pLaTeX2e}
 \def\pfmtversion
    {2018/03/09}
@@ -1184,12 +1199,6 @@
   \global\everyjob\expandafter{\platexBANNER}%
 \endgroup
 \let\platexBANNER=\@undefined
-\ifx\l@nohyphenation \@undefined
-  \newlanguage\l@nohyphenation
-\fi
-\ifx\document@default@language \@undefined
-  \let\document@default@language\m@ne
-\fi
 \AtBeginDocument{%
   \@ifpackageloaded{latexrelease}{%
     \@ifpackageloaded{platexrelease}{}{%

plvers.dtx

@@ -124,6 +124,31 @@
 %</2ekernel|latexrelease|platexrelease>
 %    \end{macrocode}
 %
+% $B$^$:!"<!$N%P!<%8%g%s$N(B\LaTeX{}$B$,MxMQ2DG=$J$3$H$r3NG'$7$^$9!#(B
+% \LaTeXe\ 2017-04-15$B$G!"%P!<%8%g%sHV9f!JF|IU!K$N%U%)!<%^%C%H$,(B
+% YYYY/MM/DD$B7A<0$+$i(BYYYY-MM-DD$B$KJQ99$5$l!"$^$?%O%$%U%M!<%7%g%s$K4X78$9$k(B
+% $B%Q%i%a!<%?(B|\document@default@language|$BEy$,F3F~$5$l$F$$$^$9!#(B
+% ^^A \LaTeXe\ 2017/01/01$B0J9_$O(Be-\TeX{}$BI,?\$K$J$C$F$$$^$9!#(B
+%    \begin{macrocode}
+%<*plcore>
+\ifx\fmtversion\@undefined
+    \errhelp{Please reinstall LaTeX.}%
+    \errmessage{This cannot happen!^^JYour file `latex.ltx'
+                might be broken}\@@end
+\else
+  \ifnum\expandafter\@parse@version\fmtversion//00\@nil<20170415
+    \errhelp{Please update your TeX installation; if not available,
+             obtain it^^Jmanually from CTAN
+             (https://ctan.org/pkg/latex-base) or from^^JGitHub
+             (https://github.com/latex3/latex2e).}%
+    \errmessage{This version of pLaTeX2e requires LaTeX2e 2017-04-15
+                or newer!^^JObtain a newer version of `latex',
+                otherwise pLaTeX2e setup will^^Jnever succeed}\@@end
+  \fi
+\fi
+%</plcore>
+%    \end{macrocode}
+%
 % \begin{macro}{\pfmtname}
 % \begin{macro}{\pfmtversion}
 % \begin{macro}{\ppatch@level}
@@ -195,17 +220,19 @@
 %
 % \subsection{$B%Q%C%A%U%!%$%k$N%m!<%I(B}
 %
+% $B%3%_%e%K%F%#HG(B\pLaTeXe{}$B$G$O%Q%C%A%U%!%$%k$r;HMQ$7$J$$$N$G!"(B
+% $B%3%a%s%H%"%&%H$7$^$7$?!#(B
+% \changes{v1.0v}{2016/05/07}{$B%Q%C%A%U%!%$%k$r%m!<%I$9$k$N$r$d$a$?!#(B}
+%
+% \iffalse
 % $B<!$NItJ,$O!"(Bp\LaTeXe{}$B$N%Q%C%A%U%!%$%k$r%m!<%I$9$k$?$a$N%3!<%I$G$9!#(B
 % $B%P%0$r=$@5$9$k$?$a$N%Q%C%A$rG[I[$9$k$+$b$7$l$^$;$s!#(B
-%
-% $B%Q%C%A%U%!%$%k$r%m!<%I$9$k%3!<%I$O%3%a%s%H%"%&%H$7$^$7$?!#(B
-% \changes{v1.0v}{2016/05/07}{$B%Q%C%A%U%!%$%k$r%m!<%I$9$k$N$r$d$a$?!#(B}
 %    \begin{macrocode}
 %<*plfinal>
 %\IfFileExists{plpatch.ltx}
-%  {\typeout{************************************^^J%
-%            * Appliying patch file plpatch.ltx *^^J%
-%            ************************************}
+%  {\typeout{***********************************^^J%
+%            * Applying patch file plpatch.ltx *^^J%
+%            ***********************************}
 %  \def\pfmtversion@topatch{unknown}
 %  \input{plpatch.ltx}
 %  \ifx\pfmtversion\pfmtversion@topatch
@@ -234,7 +261,9 @@
 %  \fi
 %  \let\pfmtversion@topatch\relax
 %  }{}
+%</plfinal>
 %    \end{macrocode}
+% \fi
 %
 % \subsection{$B5/F0;~$KI=<($9$k%P%J!<(B}
 %
@@ -250,6 +279,7 @@
 % \changes{v1.1g}{2017/12/04}{\pLaTeX{}$B$N%P%J!<$NDj5A;~$K(B
 %    \cs{pfmtname}, \cs{pfmtversion}, \cs{ppatch@level}$B$rE83+$7$J$$$h$&$K(B}
 %    \begin{macrocode}
+%<*plfinal>
 \ifx\patch@level\@undefined % fallback if undefined in LaTeX
   \def\patch@level{0}\fi
 \ifx\ppatch@level\@undefined % fallback if undefined in pLaTeX
@@ -297,6 +327,7 @@
 % \changes{v1.0z}{2016/08/26}{\file{platex.cfg}$B$NFI$_9~$_$r(B
 %    \file{plcore.ltx}$B$+$i(B\file{platex.ltx}$B$X0\F0(B}
 %
+% \iffalse
 % \subsection{$B%O%$%U%M!<%7%g%s4XO"(B}
 %
 % \begin{macro}{\l@nohyphenation}
@@ -309,9 +340,9 @@
 %    (sync with ltfinal 2017/03/09 v2.0t)}
 %    \begin{macrocode}
 %<*plfinal>
-\ifx\l@nohyphenation \@undefined
-  \newlanguage\l@nohyphenation
-\fi
+%\ifx\l@nohyphenation \@undefined
+%  \newlanguage\l@nohyphenation
+%\fi
 %    \end{macrocode}
 % \end{macro}
 %
@@ -324,12 +355,13 @@
 % \changes{v1.1b}{2017/03/19}{\cs{document@default@language}$B$NDj5A$rJ]>Z(B
 %    (sync with ltfinal 2017/03/09 v2.0t)}
 %    \begin{macrocode}
-\ifx\document@default@language \@undefined
-  \let\document@default@language\m@ne
-\fi
+%\ifx\document@default@language \@undefined
+%  \let\document@default@language\m@ne
+%\fi
 %</plfinal>
 %    \end{macrocode}
 % \end{macro}
+% \fi
 %
 % \subsection{latexrelease$B%Q%C%1!<%8$X$NBP1~(B}
 %