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%% This is part of OpTeX project, see http://petr.olsak.net/optex

\_codedecl \uv {Miscenaleous <2020-05-22>} % 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 ----------------------------
    We allow empty lines in math formulae. It is more comfortable.
    \_cod ----------------------------

\_suppressmathparerror = 1

    \_doc ----------------------------
    Lorem ipsum can be printed by \`\lipsum``[<range>]` or \`\lorem``[<range>]`,
    for example `\lipsum[3]` or `\lipsum[112-121]`, max=150.

    First usage of `\lipsum` reads the \LaTeX/ file `lipsum.ltd.tex`
    and prints the selected paragraph(s). Next usages of `\lipsum`
    prints the selected paragraph(s) from memory. This second and more
    usages of `\lipsum` are fully expandable. If you want to have all
    printings of `\lipsum` expandable, use dummy `\lipsum[0]` first.
    \_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{%
    \_fornum #1..\_ifx^#2^#1\_else#2\_fi \_do {\_csname lips:##1\_endcsname \par}}

\def\lipsum {\_lipsum}
\def\lorem  {\_lipsum}

\_endcode

2020-05-22 \lipsum uses \fornum (expandable after first usage)
2020-04-02 released