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+%% This is part of OpTeX project, see http://petr.olsak.net/optex
+
+\_codedecl \uv {Miscenaleous <2020-04-02>} % preloaded in format
+
+ \_doc ----------------------------
+ \`\useOpTeX` and \`\useoptex` are declared as `\relax`.
+ \_cod ----------------------------
+
+\_let \useOpTeX = \_relax \_let \useoptex = \_relax
+
+ \_doc ----------------------------
+ The \`\lastpage` and \`\totalpages` get the information from the
+ \^`\_currpage`. The \^`\_Xpage` from `.ref` file sets the \^`\_currpage`.
+ \_cod ----------------------------
+
+\_def\_totalpages {\_openref\_ea\_lastpageA\_currpage}
+\_def\_lastpage {\_openref\_ea\_lastpageB\_currpage}
+\_def\_lastpageA #1#2{#1}
+\_def\_lastpageB #1#2{#2}
+\_def\_currpage {{0}{?}}
+\_public \lastpage \totalpages ;
+
+ \_doc ----------------------------
+ We need \`\uv`, \`\clqq`, \`\crqq`, \`\flqq`, \`\frqq`, \`\uslang`, \`\ehyph`
+ \`\chyph`, \`\shyph`, for backward compatibility with \csplain.
+ Codes are set according to Unicode, because we are using Czech only in Unicode
+ when \LuaTeX/ is used.
+ \_cod ----------------------------
+
+
+% for compatibility with csplain:
+
+\_chardef\clqq=8222 \_chardef\crqq=8220
+\_chardef\flqq=171 \_chardef\frqq=187
+\_chardef\promile=8240
+
+\_def\uv#1{\clqq#1\crqq}
+
+\_let\uslang=\enlang \_let\ehyph=\enlang
+\_let\chyph=\cslang \_let\shyph=\sklang
+\_let\csUnicode=\csPatt \_let\czUnicode=\csPatt \_let\skUnicode=\skPatt
+
+ \_doc ----------------------------
+ The \`\letfont` was used in \csplain/ instead of `\fontlet`.
+ \_cod ----------------------------
+
+\_let \letfont = \_fontlet
+
+ \_doc ----------------------------
+ Non breaking space in Unicode.
+ \_cod ----------------------------
+
+\let ^^a0=~
+
+ \_doc ----------------------------
+ TikZ needs these funny control sequences.
+ \_cod ----------------------------
+
+\_ea\_toksdef \_csname toks@\_endcsname=0
+\_ea\_let \_csname voidb@x\_endcsname=\_voidbox
+
+ \_doc ----------------------------
+ We don't want to read `opmac.tex` unless `\input opmac` is specified.
+ \_cod ----------------------------
+
+\_def\OPmacversion{OpTeX}
+
+ \_doc ----------------------------
+ Lorem ipsum can be printed by \`\lipsum``[<range>]` or \`\lorem``[<range>]`,
+ for example `\lipsum[3]` or `\lipsum[112-121]`, max=150. The data are read
+ from \LaTeX/ file `lipsum.ltd.tex`.
+ \_cod ----------------------------
+
+\_def \_lipsum {%
+ {\_long\_def\ProvidesFile##1[##2]##3{\_ifx\_par##3\_relax\_else \_ea##3\_fi}\_tmpnum=0
+ \_def\NewLipsumPar{\_advance\_tmpnum by1
+ \_afterassignment\_negativermnm \_sxdef{lips:\_the\_tmpnum}}%
+ \_opinput {lipsum.ltd.tex}%
+ \_global\_let \_lipsum=\_reallipsum
+ }\_lipsum
+}
+\_def\_negativermnm{\_romannumeral-`\.}
+\_def\_reallipsum[#1]{\_lipsumA #1\_empty-\_empty\_end}
+\_def\_lipsumA #1-#2\_empty#3\_end{\_tmpnum=#1 \_edef\_tmp{\_ifx^#2^#1\_else#2\_fi}%
+ \_loop \_csname lips:\_the\_tmpnum\_endcsname \par % \par is better here
+ \_ifnum\_tmpnum<\_tmp \_advance\_tmpnum by1 \_repeat
+}
+\def\lipsum {\_lipsum}
+\def\lorem {\_lipsum}
+
+\_endcode
+