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-%% This is part of the OpTeX project, see http://petr.olsak.net/optex
-
-% This file is read from optex-doc.tex
-% Use: optex optex-doc  (three times) to create whole documentation.
-
-\let\new=\relax
-
-\sec Starting with \OpTeX/
-%%%%%%%%%%%%%%%%%%%%%%%%%
-
-\new
-\OpTeX/ is compiled as a format for \LuaTeX/. Maybe there is a command
-`optex` in your \TeX/ distribution. Then you can write into the command line
-
-\begtt
-optex document
-\endtt
-%
-You can try to process `optex op-demo` or `optex optex-doc`.
-
-If there is no `optex` command, see more information about installation
-\OpTeX/ at \url{http://petr.olsak.net/optex}.
-
-A minimal document should be
-
-\begtt
-\fontfam[LMfonts]
-Hello World! \bye
-\endtt
-
-The first line \~`\fontfam[LMfonts]` tells that Unicode Latin Modern
-fonts (derived from Computer Modern) are used. If you omit this line then
-preloaded Latin Modern fonts are used but preloaded fonts cannot be in
-Unicode\fnote
-{This is a technical limitation of \LuaTeX/ for fonts downloaded in formats:
-only 8bit fonts can be preloaded.}.
-So the sentence `Hello World` will be OK without the first line, but you
-cannot print such sentence in other languages (for example `Ahoj světe!`)
-where Unicode fonts are needed
-because the characters like `ě` are not mapped correctly in preloaded
-fonts.
-
-A somewhat larger example with common settings should be:
-
-\begtt \catcode`!=0
-\fontfam[Termes]  % selecting Unicode font family Termes (section !ref[fontfam])
-\typosize[11/13]  % setting default font size and baselineskip (sec. !ref[sizes])
-\margins/1 a4 (1,1,1,1)in % setting A4 paper, 1 in margins (section !ref[marg])
-\cslang           % Czech hyphenation patterns (section !ref[lang])
-
-Tady je zkušební textík v českém jazyce.
-\bye
-\endtt
-%
-You can look at `op-demo.tex` file for a more complex, but still simple example.
-
-\sec Page layout
-%%%%%%%%%%%%%%%%
-
-\secc[marg] Setting the margins
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-The \^`\margins` command declares margins of the document. This command have
-the following parameters:
-
-\begtt \catcode`\<=13
-\margins/<pg> <fmt> (<left>,<right>,<top>,<bot>)<unit>
-  example:
-\margins/1 a4 (2.5,2.5,2,2)cm
-\endtt
-
-Parameters are:
-
-\begitems
-* <pg> \dots\ `1` or `2` specifies one-page or two-pages design.
-* <fmt> \dots\ paper format (a4, a4l, a5, letter, etc. or user defined).
-* <left>, <right>, <top>, <bot> \dots\ gives the amount of left, right,
-      top and bottom margins.
-* <unit> \dots\ unit used for values <left>, <right>, <top>, <bot>.
-\enditems
-
-Each of the parameters <left>, <right>, <top>, <bot> can be empty.
-If both <left> and <right> are nonempty then `\hsize` is set. Else `\hsize`
-is unchanged. If both <left> and <right> are empty then typesetting area is
-centered in the paper format. The analogical rule works when <top> or <bot>
-parameter is empty (`\vsize` instead `\hsize` is used). Examples:
-
-\begtt
-\margins/1 a4 (,,,)mm   % \hsize, \vsize untouched,
-                        % typesetting area centered
-\margins/1 a4 (,2,,)cm  % right margin set to 2cm
-                        % \hsize, \vsize untouched, vertically centered
-\endtt
-
-If `<pg>=1` then all pages have the same margins. If `<pg>=2` then the
-declared margins are true for odd pages. The margins at the even pages are
-automatically mirrored in such case, it means that <left> is replaced by
-<right> and vice versa.
-
-\OpTeX/ declares following paper formats: a4, a4l (landscape~a4),
-a5, a5l, a3, a3l, b5, letter and user can declare another own format by \~`\sdef`:
-
-\begtt
-\sdef{_pgs:b5l}{(250,176)mm}
-\sdef{_pgs:letterl}{(11,8.5)in}
-\endtt
-
-The `<fmt>` can be also in the form `(<width>,<height>)<unit>` where `<unit>` is
-optional. If it is missing then `<unit>` after margins specification is
-used. For example:
-
-\begtt
-\margins/1 (100,200) (7,7,7,7)mm
-\endtt
-%
-declares the paper 100$\times$200\,mm with all four margins 7\,mm. The spaces
-before and after <fmt> parameter are necessary.
-
-The command \^`\magscale[<factor>]` scales the whole typesetting area.
-\new The fixed point of such scaling is the upper left corner of the paper sheet.
-Typesetting (breakpoints etc.) is unchanged. All units are relative after
-such scaling. Only paper format's dimensions stay unscaled. Example:
-
-\begtt
-\margins/2 a5 (22,17,19,21)mm
-\magscale[1414] \margins/1 a4 (,,,)mm
-\endtt
-%
-The first line sets the `\hsize` and `\vsize` and margins for final
-printing at a5 format. The setting on the second line centers the scaled
-typesetting area to the true a4 paper while breaking points for paragraphs
-and pages are unchanged. It may be usable for
-review printing. After the review is done, the second line can be commented out.
-
-\secc Concept of the default page
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-\OpTeX/ uses \"output routine" for page design.
-It is very similar to the Plain \TeX/ output routine.
-There is \^`\headline` followed by \"page body" followed by
-\^`\footline`. The \^`\headline` is empty by default and it can be used
-for running headers repeated on each page. The \^`\footline` prints
-centered page number by default. You can set the \^`\footline` to empty
-using \^`\nopagenumbers` macro.
-
-The margins declared by \^`\margins` macro (documented in the previous
-section~\ref[marg]) is concerned to the page body,
-i.e.\ the \^`\headline` and \^`\footline` are placed to the top and bottom
-margins.
-
-The distance between the \^`\headline` and the top of the page body is given by
-the \^`\headlinedist` register. The distance between bottom of the page body and
-the \^`\footline` is given by \^`\footlinedist`. The default values are:
-
-\begtt
-\headline = {}
-\footline = {\_hss\_rmfixed \_folio \_hss} % \folio expands to page number
-\headlinedist = 14pt % from baseline of \headline to top of page body
-\footlinedist = 24pt % from last line in pagebody to baseline of footline
-\endtt
-
-The page body should be divided into top insertions (floating tables and
-figures) followed by a real text and followed by footnotes.
-Typically, the only real text is here.
-
-The \^`\pgbackground` tokens list is empty by default but it can be used for
-creating a background of each page (colors, picture, watermark for example).
-The macro \^`\draft` uses this register and puts big text DRAFT as a watermark
-to each page. You can try it.
-
-More about the page layout is documented in sections~\ref[oparams] and~\ref[output].
-
-\secc Footnotes and marginal notes
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-The Plain \TeX/'s macro \^`\footnote` can be used as usual. But a new macro
-\^`\fnote{<text>}` is defined. The footnote mark is added automatically and it
-is numbered
-\new
-on each chapter from one\fnote
-{You can declare \^`\fnotenumglobal` if you want footnotes numbered in whole
-document from one or \^`\fnotenumpages` if you want footnotes numbered at each
-page from one. Default setting is \^`\fnotenumchapters`}.
-The <text> is scaled to 80 \%.
-User can redefine footnote mark or scaling, as shown in the section~\ref[fnotes].
-
-The \^`\fnote` macro is fully applicable only in \"normal outer" paragraph.
-It doesn't work inside boxes (tables, for example). If you are solving such
-a case then you can use the command \^`\fnotemark``<numeric-label>` inside the box: only the
-footnote mark is generated here. When the box is finished you can use
-\^`\fnotetext{<text>}`. This macro puts the <text> to the footnote.
-The <numeric-label> has to be `1` if only one such command is in the box.
-Second \^`\fnotemark` inside the same box has to have the parameter `2` etc.
-The same number of \^`\fnotetext`s have to be written
-after the box as the number of \^`\fnotemark`s inserted inside the box.
-Example:
-
-\begtt
-Text in a paragraph\fnote{First notice}...    % a "normal" footnote
-\table{...}{...\fnotemark1...\fnotemark2...}  % two footnotes in a box
-\fnotetext{Second notice}
-\fnotetext{Third notice}
-...
-\table{...}{...\fnotemark1...}                % one footnote in a box
-\fnotetext{Fourth notice}
-\endtt
-
-The marginal note can be printed by the \^`\mnote{<text>}` macro. The <text>
-is placed to the right margin on the odd pages and it is placed to the left
-margin on the even pages. This is done after second \TeX{} run because the
-relevant information is stored in an external file and read from it again.
-If you need to place the notes only to the fixed margin write
-\^`\fixmnotes\right` or \^`\fixmnotes\left`.
-
-The <text> is formatted as a little paragraph with the maximal width
-\^`\mnotesize` ragged left on the left margins or ragged right on the right
-margins. The first line of this little paragraph has its vertical position
-given by the position of \^`\mnote` in the text. The exceptions are possible
-by using the `up` keyword: \~`\mnote`` up<dimen>{<text>}`.
-You can set such <dimen> to each \^`\mnote` manually in final printing
-in order to margin notes do not overlap. The positive value of <dimen>
-shifts the note up and negative value shifts it down. For example
-\^`\mnote`` up 2\baselineskip{<text>}` shifts this marginal note two lines up.
-
-\sec Fonts
-%%%%%%%%%%
-
-\secc[fontfam] Font families
-%%%%%%%%%%%%%%%%%%%%%%%
-
-You can select the font family by \^`\fontfam[<Family-name>]`.
-The argument <Family-name> is case insensitive and spaces are ignored in it. For
-example, \^`\fontfam[LM Fonts]` is equal to \^`\fontfam[LMfonts]` and it is equal
-to \^`\fontfam[lmfonts]`. Several aliases are prepared, thus
-\^`\fontfam[Latin Modern]` can be used for loading Latin Modern family too.
-
-If you write \^`\fontfam[?]` then all font families registered in \OpTeX/
-are listed on the terminal and in the log file.
-If you write \^`\fontfam[catalog]` then a catalog of all fonts registered in
-\OpTeX/ and available in your \TeX/ system is printed. The instructions
-on how to register your own font family are appended in the catalog.
-
-If the family is loaded then {\em font modifiers} applicable in such font family
-are listed on the terminal: (`\caps`, `\cond` for example).
-And there are four basic {\em variant selectors} (\^`\rm`, \^`\bf`, \^`\it`, \^`\bi`).
-The usage of variant selectors is the same as in Plain \TeX:
-`{\it italics text}`, `{\bf bold text}` etc.
-
-The font modifiers (`\caps`, `\cond` for example) can
-be used before a variant selector and they
-can be (independently) combined: `\caps\it` or `\cond\caps\bf`. The
-modifiers keep their internal setting until the group ends or until another
-modifier that negates the previous feature is used. So
-`{\caps \rm First text \it Second text}`
-gives {\caps \rm First text \it Second text}.
-
-The font modifier without following variant selector does not change the font
-actually, it only prepares data used by next variant selectors.
-There is one special variant selector \^`\currvar` which does not change the
-selected variant but reloads the font due to (maybe newly
-specified) font modifier(s).
-
-The context between variants \^`\rm` $\leftrightarrow$ \^`\it` and
-\^`\bf` $\leftrightarrow$ \^`\bi` is kept by the \^`\em`
-macro (emphasize text).
-It switches from current \^`\rm` to \^`\it`, from current \^`\it` to \^`\rm`, from
-current \^`\bf` to \^`\bi` and from current \^`\bi` to \^`\bf`.
-The italics correction `\/` is inserted automatically, if needed. Example:
-
-\begtt
-This is {\em important} text.     % = This is {\it important\/} text.
-\it This is {\em important} text. % = This is\/ {\rm important} text.
-\bf This is {\em important} text. % = This is {\bi important\/} text.
-\bi This is {\em important} text. % = This is\/ {\bf important} text.
-\endtt
-
-\new
-More about the \OpTeX/ Font Selection System is written in the technical
-documentation in the section~\ref[fontsystem].
-You can mix more font families in your document, you can
-declare your own variant selectors or modifiers, etc.
-
-\secc[sizes] Font sizes
-%%%%%%%%%%%%%%%%%%%%%
-
-The command \^`\typosize[<fontsize>/<baselineskip>]` sets the font size of text and
-math fonts and baselineskip. If one of these two parameters is empty, the
-corresponding feature stays unchanged. Don't write the unit of these
-parameters. The unit is internally set to \^`\ptunit` which is 1pt by default.
-You can change the unit by the command \^`\ptunit=<something-else>`,
-for instance \^`\ptunit=1mm` enlarges all font sizes declared by \^`\typosize`.
-Examples:
-
-\begtt
-\typosize[10/12]   % default of Plain TeX
-\typosize[11/12.5] % font 11pt, baseline 12.5pt
-\typosize[8/]      % font 8pt, baseline unchanged
-\endtt
-
-The commands for font size setting described in this section
-have local validity. If you put them into a group,
-the settings are lost when the group is finished. If you set
-something relevant with paragraph shape (baselineskip given by
-\^`\typosize` for example) then you must first finalize the
-paragraph before closing the group:
-`{\typosize[12/14] ...<text of paragraph>... \par}`.
-
-The command \^`\typoscale[<font-factor>/<baselineskip-factor>]`
-sets the text and math fonts
-size and baselineskip as a multiple of the current fonts size and
-baselineskip. The factor is written in \"scaled"-like way, it means that 1000
-means factor one. The empty parameter is equal to the parameter 1000,
-i.e. the value stays unchanged. Examples:
-
-\begtt
-\typoscale[800/800]    % fonts and baselineskip re-size to 80 %
-\typoscale[\magstep2/] % fonts bigger 1,44times (\magstep2 expands to 1440)
-\endtt
-
-First usage of \^`\typosize` or \^`\typoscale` macro in your document sets so-called {\em main values}, i.\,e.\ main font size and main baselineskip. They are internally
-saved in registers \^`\mainfosize` and \^`\mainbaselineskip`.
-
-\new
-The \^`\typoscale` command does scaling with respect to current values by default.
-If you want to do it with respect to the main values, type \^`\scalemain` immediately
-before \^`\typoscale` command.
-
-\begtt
-\typosize[12/14.4] % first usage in document, sets main values internally
-\typosize[15/18]   % bigger font
-\scalemain \typoscale[800/800] % reduces from main values, no from current.
-\endtt
-
-The \^`\typosize` and \^`\typoscale` macros initialize the font family by `\rm`.
-You can re-size only the current font by the command
-\^`\thefontsize[<font-size>]` or the font can be rescaled by
-\^`\thefontscale[<factor>]`. These macros don't change math fonts sizes nor
-baselineskip.
-
-\new
-There is \"low level" \^`\setfontsize{<size-spec>}` command which behaves like
-a font modifier and sets given font size used by next variant selectors.
-It doesn't change the font size immediately, but the following variant selector
-does it. For example \^`\setfontsize{at15pt}`\^`\currvar` sets current variant to 15pt.
-
-If you are using a font family with \"optical sizes feature" (i.\,e.\ there
-are more recommended sizes of the same font which are not scaled
-linearly; a good example is Computer Modern aka Latin Modern fonts)
-then the recommended size is selected by all mentioned commands automatically.
-
-More information about resizing of fonts is documented in the
-section~\ref[setfontsize].
-
-\secc Typesetting math
-%%%%%%%%%%%%%%%%%%%%%
-
-See the additional document
-\ulink[http://petr.olsak.net/ftp/olsak/optex/optex-math.pdf]
-{Typesetting Math with \OpTeX/} for more details about this issue.
-
-\OpTeX/ preloads a collection of 7bit Computer Modern math fonts
-and AMS fonts in its format for math typesetting.
-You can use them in any size and in the \^`\boldmath` variant.
-%
-\new
-Most declared text font families (see \^`\fontfam` in the section~\ref[fontfam])
-are configured with a recommended Unicode
-math font. This font is automatically loaded unless you specify
-\^`\noloadmath` before first \^`\fontfam` command. See log file for more
-information about loading text font family and Unicode math fonts. If you
-prefer another Unicode math font, specify it by \^`\loadmath{[<font-file>]}`
-or \^`\loadmath{<font-name>}` before first \^`\fontfam` command.
-
-Hundreds math symbols and operators like in AMS\TeX/ are accessible.
-For example  `\alpha` $\alpha$, `\geq`~$\geq$, `\sum` $\sum$,
-`\sphericalangle` $\sphericalangle$, `\bumpeq`, $\bumpeq$. See AMS\TeX/
-manual or
-\ulink[http://petr.olsak.net/ftp/olsak/optex/optex-math.pdf]
-{Typesetting Math with \OpTeX/} for complete list of math symbols.
-
-The following math alphabets are available:
-
-\begtt    \catcode`\$=3 \catcode`/=0 \medmuskip=0mu \adef{ }{ }
-\mit     % mathematical variables    $abc-xyz,ABC-XYZ$
-\it      % text italics              $/it abc-xyz,ABC-XYZ$
-\rm      % text roman                $/rm abc-xyz,ABC-XYZ$
-\cal     % normal calligraphics      $/cal ABC-XYZ$
-\script  % script                    $/script ABC-XYZ$
-\frak    % fracture                  $/frak abc-xyz,ABC-XYZ$
-\bbchar  % double stroked letters    $/bbchar ABC-XYZ$
-\bf      % sans serif bold           $/bf abc-xyz,ABC-XYZ$
-\bi      % sans serif bold slanted   $/bi abc-xyz,ABC-XYZ$
-\endtt
-
-The last two selectors \^`\bf` and \^`\bi` select the sans serif fonts in math regardless of the current text font family. This is a common notation for vectors and
-matrices. You can re-declare them, see section~\ref[unimath-codes] where
-definitions of Unicode math variants of \^`\bf` and \^`\bi` selectors are documented.
-
-The math fonts can be scaled by \^`\typosize` and \^`\typoscale` macros.
-Two math fonts collections are prepared: \^`\normalmath` for normal weight
-and \^`\boldmath` for bold. The first one is set by default, the second one
-is usable for math formulae in titles typeset in bold, for example.
-
-\new
-You can use \^`\mathbox{<text>}` inside math mode. It behaves as `{\hbox{<text>}}`
-(i.e. the <text> is printed in horizontal non-math mode)
-but the size of the <text> is adapted to the context of math size (text or script or
-scriptscript).
-
-\sec Typical elements of the document
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-\secc[chap] Chapters and sections
-%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-The documents can be divided into chapters (\^`\chap`),
-sections (\^`\sec`), subsections (\^`\secc`) and they can be titled
-by \^`\tit` command. The parameters are separated by the end of current line (no
-braces are used):
-
-\begtt \catcode`\<=13
-\tit Document title <end of line>
-\chap Chapter title <end of line>
-\sec Section title <end of line>
-\secc Subsection title <end of line>
-\endtt
-
-The chapters are automatically numbered by one number, sections by two numbers
-(chapter.section), and subsections by three numbers. If there are no chapters
-then sections have only one number and subsections two.
-
-The implicit design of the titles of chapter etc.\ is implemented in the
-macros \^`\_printchap`, \^`\_printsec` and \^`\_printsecc`. A designer can simply change
-these macros if he/she needs another behavior.
-
-The first paragraph after the title of chapter, section, and subsection is
-not indented but you can type `\let`\^`\_firstnoindent=\relax` if you need all
-paragraphs indented.
-
-If a title is so long then it breaks into more lines in the output. It is better to hint at the
-breakpoints because \TeX/ does not interpret the meaning of the title.
-Users can put the \^`\nl` (means newline) to the breakpoints.
-
-If you want to arrange a title to more lines in your source file then you can
-use `^^J` at the end of each line (except the last one).
-When `^^J` is used, then the reading of the title continues at the next line.
-The \"normal" comment character `%` doesn't work in titles.
-You can use \^`\nl`{\visiblesp` ^^J`} if you want to have corresponding lines in the source
-and the output.
-
-The chapter, section, or subsection isn't numbered if the \^`\nonum` precedes.
-And the chapter, section, or subsection isn't delivered to the table of
-contents if \^`\notoc` precedes. You can combine both prefixes.
-
-\secc[cap] Another numbered objects
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-Apart from chapters, sections, and subsections, there are another
-automatically numbered objects: equations, captions for tables and
-figures. The user can declare more numbered objects.
-
-If the user writes the \^`\eqmark` as the last element of the display mode then
-this equation is numbered. The equation number is printed in brackets. This number
-is reset in each section by default.
-
-If the \^`\eqalignno` is used, then user can put \^`\eqmark` to the last column
-before `\cr`. For example:
-
-\begtt
-\eqalignno{
-    a^2+b^2 &= c^2 \cr
-          c &= \sqrt{a^2+b^2} & \eqmark \cr}
-\endtt
-
-Another automatically numbered object is a caption which is tagged by \^`\caption/t` for
-tables and \^`\caption/f` for figures. The caption text follows.
-The \^`\cskip` can be used between \^`\caption` text and the real object (table
-or figure). You can use two orders: `<caption>\cskip <object>` or
-`<object>\cskip <caption>`.
-The \^`\cskip` creates appropriate vertical space between them. Example:
-
-\begtt
-\caption/t The dependency of the computer-dependency on the age.
-\cskip
-\noindent\hfil\table{rl}{
-    age   & value \crl\noalign{\smallskip}
-    0--1  & unmeasured \cr
-    1--6  & observable \cr
-    6--12 & significant \cr
-   12--20 & extremal \cr
-   20--40 & normal \cr
-   40--60 & various \cr
-   60--$\infty$ & moderate}
-\endtt
-
-This example produces:
-
-\medskip
-\caption/t The dependency of the computer-dependency on the age.
-\cskip
-\noindent\hfil\table{rl}{
-                age   & value \crl\noalign{\smallskip}
-                0--1  & unmeasured \cr
-                1--6  & observable \cr
-                6--12 & significant \cr
-               12--20 & extremal \cr
-               20--40 & normal \cr
-               40--60 & various \cr
-               60--$\infty$ & moderate}
-\medskip
-
-You can see that the word \"Table" followed by a number is added by the macro
-`\caption/t`.
-The caption text is centered. If it occupies more lines then the
-last line is centered.
-
-The macro \^`\caption/f` behaves like \^`\caption/t` but it is intended for
-figure captions with independent numbering.
-The word (Table, Figure) depends on the selected language (see
-section~\ref[lang] about languages).
-
-If you wish to make the table or figure as a floating object, you need to use
-Plain \TeX/ macros \^`\midinsert` or \^`\topinsert` terminated by \^`\endinsert`.
-Example:
-
-\begtt
-\topinsert  % table and its caption printed at the top of the current page
-   <caption and table>
-\endinsert
-\endtt
-%
-The pair \^`\midinsert`...\^`\endinsert` prefers to put the enclosed object
-to the current place. Only if this is unable due to page breaking, it
-behaves like \^`\topinsert`...\^`\endinsert`.
-
-\new
-There are five prepared counters `A`, `B`, `C`, `D` and `E`.
-They are reset in each chapter and section\fnote
-{This feature can be changed, see the section~\ref[sections] in the technical documentation.}.
-They can be used in context of \^`\numberedpar` `<letter>{<text>}`
-macro. For example:
-\begtt
-\def\theorem    {\numberedpar A{Theorem}}
-\def\corollary  {\numberedpar A{Corollary}}
-\def\definition {\numberedpar B{Definition}}
-\def\example    {\numberedpar C{Example}}
-\endtt
-%
-Three independent numbers are used in this example. One for Theorems and Corollaries
-second for Definitions and third for Examples. The user can write
-`\theorem Let $M$ be...` and the new paragraph is started with the text:
-{\bf Theorem 1.4.1.} Let $M$ be...
-You can add an optional parameter in brackets. For example,
-`\theorem [(L'Hôpital's rule)] Let $f$, $g$ be...`
-is printed like {\bf Theorem 1.4.2 (L'Hôpital's rule).} Let $f$, $g$ be...
-
-\secc References
-%%%%%%%%%%%%%%%
-
-Each automatically numbered object documented in
-sections \ref[chap] and \ref[cap] can be referenced
-\new
-if optional parameter
-`[<label>]` is appended to \^`\chap`, \^`\sec`,
-\^`\secc`, \^`\caption/t`, \^`\caption/f` or \^`\eqmark`. The alternative syntax is
-to use \^`\label[<label>]` before mentioned commands (not necessarily directly
-before). The reference is realized by \^`\ref[<label>]` or \^`\pgref[<label>]`.
-Example:
-
-\begtt
-\sec[beatle] About Beatles
-
-\noindent\hfil\table{rl}{...} % the table
-\cskip
-\caption/t [comp-depend] The dependency of the comp-dependency on the age.
-
-\label[pythagoras]
-$$ a^2 + b^2 = c^2 \eqmark $$
-
-Now we can point to the section~\ref[beatle] on the page~\pgref[beatle]
-or write something about the equation~\ref[pythagoras]. Finally there
-is an interesting Table~\ref[comp-depend].
-\endtt
-
-If there are forward referenced objects then users have to run \TeX{} twice.
-During each pass, the working `*.ref` file (with references data) is created
-and this file is used (if it exists) at the beginning of the document.
-
-You can use the \^`\label[<label>]` before the `\theorem`, `\definition` etc.\
-(macros defined with `\numberedpar`) if you want to reference these numbered objects.
-You can't use `\theorem[<label>]` because the optional parameter
-is reserved to another purpose here.
-
-You can create a reference to whatever else by commands
-\^`\label[<label>]`\^`\wlabel{<text>}`. The connection between <label> and
-<text> is established. The \^`\ref[<label>]` will print <text>.
-
-By default, labels are not printed, of course. But if you are preparing a
-draft version of your document then you can declare \^`\showlabels`. The labels
-are printed at their destination places after such a declaration.
-
-\secc Hyperlinks, outlines
-%%%%%%%%%%%%%%%%%%%%%%%%%
-
-If the command \^`\hyperlinks` `<color-in> <color-out>` is used at the beginning of
-the document, then the following objects are hyperlinked in the PDF output:
-
-\begitems
-* numbers and texts generated by \^`\ref` or \^`\pgref`,
-* numbers of chapters, sections, subsections, and page numbers in the table of contents,
-* numbers or marks generated by \~`\cite` command (bibliography references),
-* texts printed by \~`\url` or \~`\ulink` commands.
-\enditems
-
-The last object is an external link and it is colored by
-<color-out>. Other links are internal and they are colored by
-<color-in>. Example:
-
-\begtt
-\hyperlinks \Blue \Green % internal links blue, URLs green.
-\endtt
-
-You can use another marking of active links: by frames which are visible in
-the PDF viewer but invisible when the document is printed. The way to do it
-is to define the macros \^`\_pgborder`, \^`\_tocborder`, \^`\_citeborder`,
-\^`\_refborder` and \^`\_urlborder` as the triple of RGB components of the used
-color. Example:
-
-\begtt
-\def\_tocborder {1 0 0}  % links in table of contents: red frame
-\def\_pgborder {0 1 0}   % links to pages: green frame
-\def\_citeborder {0 0 1} % links to references: blue frame
-\endtt
-
-By default, these macros are not defined. It means that no frames are created.
-
-The hyperlinked footnotes can be activated by \^`\fnotelinks` `<color-fnt> <color-fnf>`
-where footnote marks in the text have `<color-fnt>` and the same footnote marks
-in footnotes have <color-fnf>. You can define relevant borders
-\^`\_fntborder` and \^`\_fnfborder` analogically as \^`\_pgborder` (for example).
-
-There are \"low level" commands to create the links. You can specify the
-destination of the internal link by \^`\dest[<type>:<label>]`. The
-active text linked to the \^`\dest` can be created by
-\^`\ilink[<type>:<label>]{<text>}`. The `<type>` parameter is one of
-the `toc`, `pg`, `cite`, `ref`, or another special for your purpose.
-These commands create internal links only when \^`\hyperlinks` is declared.
-
-The \^`\url` macro prints its parameter in \~`\tt` font and creates a potential
-breakpoints in it (after slash or dot, for example). If the \^`\hyperlinks`
-declaration is used then the parameter of \^`\url` is treated as an external URL link.
-An example: `\url{http://www.olsak.net}` creates \url{http://www.olsak.net}.
-The characters \code{\%}, `\`, `#`, `{`, and `}` have to be protected by
-backslash in the \^`\url` argument, the other special characters `~`,
-`^`, `&` can be written as single character\fnote
-{More exactly, there are the same rules as for `\code` command, see
-section~\ref[verbatim].}.
-You can insert the `\|` command
-in the `\url` argument as a potential breakpoint.
-
-If the linked text have to be different than the URL, you can use
-\^`\ulink[<url>]{<text>}` macro. For example:
-`\ulink[http://petr.olsak.net/optex]{\OpTeX/ page}`
-outputs to the text
-\ulink[http://petr.olsak.net/optex]{\OpTeX/ page}.
-The characters \code{\%}, `\`, `#`, `{`, and `}` must by escaped in
-the <url> parameter.
-
-The PDF format provides {\em outlines} which are notes placed in the special frame of
-the PDF viewer. These notes can be managed as a structured and hyperlinked
-table of contents of the document. The command \^`\outlines{<level>}` creates
-such outlines from data used for the table of contents in the document. The
-<level> parameter gives the level of opened sub-outlines
-in the default view. The deeper levels can be opened by mouse click on the
-triangle symbol after that.
-
-\new
-If you are using a special unprotected macro in section titles then \^`\outlines` macro
-may crash. You must declare a variant of the macro for outlines case which is
-expandable. Use \~`\regmacro` in this case. See the section \ref[toc] for more information
-about \~`\regmacro`.
-
-The command \^`\insertoutline{<text>}` inserts a next entry into PDF outlines at
-the main level~0. These entries can be placed before the table of contents (created
-by \^`\outlines`) or after it. Their hyperlink destination is in the place
-where the \^`\insertoutline` macro is used.
-
-The command \^`\thisoutline{<text>}` uses <text> in the outline instead of default
-title text for the first following `\chap`, `\sec`, or `\secc`.
-Special case: \^`\thisoutline{\relax}` doesn't create any outline for the following
-`\chap`, `\sec`, or `\secc`.
-
-\secc Lists
-%%%%%%%%%%
-
-The list of items is surrounded by \^`\begitems` and \^`\enditems` commands.
-The asterisk (`*`) is active within this environment and it starts one item.
-The item style can be chosen by the \^`\style` parameter written after \^`\begitems`:
-
-\begtt
-\style o % small bullet
-\style O % big bullet (default)
-\style - % hyphen char
-\style n % numbered items 1., 2., 3., ...
-\style N % numbered items 1), 2), 3), ...
-\style i % numbered items (i), (ii), (iii), ...
-\style I % numbered items I, II, III, IV, ...
-\style a % items of type a), b), c), ...
-\style A % items of type A), B), C), ...
-\style x % small rectangle
-\style X % big rectangle
-\endtt
-
-For example:
-
-\begtt
-\begitems
-* First idea
-* Second idea in subitems:
-  \begitems \style i
-  * First sub-idea
-  * Second sub-idea
-  * Last sub-idea
-  \enditems
-* Finito
-\enditems
-\endtt
-%
-produces:
-
-\begitems
-* First idea
-* Second idea in subitems:
-  \begitems \style i
-   * First sub-idea
-   * Second sub-idea
-   * Last sub-idea
-  \enditems
-* Finito
-\enditems
-
-Another style can be defined by the command \~`\sdef{_item:<style>}{<text>}`.
-Default item can be set by \^`\defaultitem={<text>}`.
-The list environments can be nested. Each new level of items is indented by
-next multiple of \^`\iindent` value which is set to `\parindent` by default.
-The \^`\ilevel` register says what level of items is currently processed.
-Each \^`\begitems` starts \^`\everylist` tokens register. You can set, for
-example:
-\begtt
-\everylist={\ifcase\ilevel\or \style X \or \style x \else \style - \fi}
-\endtt
-
-You can say \^`\begitems` \^`\novspaces` if you don't want vertical spaces above
-and below the list. The nested item list is without vertical spaces
-automatically. More information about the design of lists of items should be
-found in the section~\ref[lists].
-
-A \"selected block of text" can be surrounded by
-\^`\begblock`\dots\^`\endblock`. The default design of blocks of text is
-indented text in smaller font. The blocks of text can be nested.
-
-\secc Tables
-%%%%%%%%%%%
-
-The macro \^`\table{<declaration>}{<data>}` provides similar <declaration>
-of tables as in \LaTeX: you can use letters `l`, `r`, `c`, each letter declares
-one column (aligned to left, right, center, respectively).
-These letters can be combined by the `|` character (vertical line). Example
-
-\begtt
-\table{||lc|r||}{                  \crl
-   Month    & commodity  & price   \crli \tskip2pt
-   January  & notebook   & \$ 700  \cr
-   February & skateboard & \$ 100  \cr
-   July     & yacht      & k\$ 170 \crl}
-\endtt
-%
-generates the result:
-
-\vskip-\medskipamount
-\noindent\hfil\table{||lc|r||}{    \crl
-   Month    & commodity  & price   \crli \tskip2pt
-   January  & notebook   &  \$ 700 \cr
-   February & skateboard &  \$ 100 \cr
-   July     & yacht      & k\$ 170 \crl}
-\medskip
-
-Apart from `l`, `r`, `c` declarators, you can use the `p{<size>}` declarator
-which declares the column with paragraphs of given width. More precisely,
-a long text in the table cell is printed as a multiline paragraph with given width.
-By default, the paragraph is left-right justified. But there are
-alternatives:
-
-\begitems
-* `p{<size>`\^`\fL}` fit left, i.e.\ left justified, ragged right,
-* `p{<size>`\^`\fR}` fit right, i.e.\ right justified, ragged left,
-* `p{<size>`\^`\fC}` fit center, i.e.\ ragged left plus right,
-* `p{<size>`\^`\fS}` fit special, short one-line pararaph centered,
-                long paragraph normal,
-* `p{<size>`\^`\fX}` fit extra, left-right justified but last line centered.
-\enditems
-
-You can use `(<text>)` in the <declaration>. Then this text is applied in
-each line of the table. For example `r(\kern10pt)l` adds more 10\,pt space
-between `r` and `l` rows.
-
-An arbitrary part of the <declaration> can be repeated by a <number>
-prefixed. For example `3c` means `ccc` or `c 3{|c}` means
-`c|c|c|c`. Note that spaces in the <declaration> are ignored and you
-can use them in order to more legibility.
-
-The command `\cr` used in the <data> part of the table
-is generally known from Plain \TeX. It marks the end of each row in the table.
-Moreover \OpTeX/ defines following similar commands:
-
-\begitems
-* \^`\crl` \dots\ the end of the row with a horizontal line after it.
-* \^`\crll` \dots\ the end of the row with a double horizontal line after it.
-* \^`\crli` \dots\ like \^`\crl` but the horizontal line doesn't intersect the
-      vertical double lines.
-* \^`\crlli` \dots\ like \^`\crli` but horizontal line is doubled.
-* \^`\crlp{<list>}` \dots\ like \^`\crli` but the lines are drawn only in the
-  columns mentioned in comma-separated `<list>` of their numbers.
-  The <list> can include `<from>-<to>` declarators, for example
-  \^`\crlp{1-3,5}` is equal to \^`\crlp{1,2,3,5}`.
-\enditems
-
-The \^`\tskip``<dimen>` command works like the `\noalign{\vskip<dimen>}`
-immediately after `\cr*` commands but it doesn't interrupt the vertical lines.
-
-\new
-You can use the following parameters for the \^`\table` macro. Default values are listed
-too.
-
-\begtt
-\everytable={}       % code used in \vbox before table processing
-\thistable={}        % code used in \vbox, it is removed after using it
-\tabiteml={\enspace} % left material in each column
-\tabitemr={\enspace} % right material in each column
-\tabstrut={\strut}   % strut which declares lines distance in the table
-\tablinespace=2pt    % additional vert. space before/after horizontal lines
-\vvkern=1pt          % space between lines in double vertical line
-\hhkern=1pt          % space between lines in double horizontal line
-\tabskip=0pt         % space between columns
-\tabskipl=0pt \tabskipr=0pt % space before first and after last column
-\endtt
-
-Example: if you do \^`\tabiteml={$\enspace}`\^`\tabitemr={\enspace$}` then
-the \^`\table` acts like \LaTeX's array environment.
-
-If there is an item that spans to more than one column in the table then
-the macro \^`\multispan{<number>}` (from Plain \TeX) can help you. Another
-alternative is
-the command \^`\mspan``<number>[<declaration>]{<text>}`
-which spans <number> columns and formats the <text> by the
-<declaration>. The <declaration> must include a declaration of only one column
-with the same syntax as common \^`\table` <declaration>.
-If your table includes vertical rules and you want to
-create continuous vertical rules by \^`\mspan`, then use rule declarators `|`
-after `c`, `l` or `r` letter in \^`\mspan` <declaration>. The
-exception is only in the case when \^`\mspan` includes the first
-column and the table have rules on the left side. The example of \^`\mspan`
-usage is below.
-
-The \^`\frame{<text>}` makes a frame around <text>. You can put the whole \^`\table`
-into \^`\frame` if you need double-ruled border of the table. Example:
-
-\begtt
-\frame{\table{|c||l||r|}{ \crl
-  \mspan3[|c|]{\bf Title} \crl   \noalign{\kern\hhkern}\crli
-  first & second & third  \crlli
-  seven & eight  & nine   \crli}}
-\endtt
-%
-creates the following result:
-
-\hfil\frame{\table{|c||l||r|}{\crl
-  \mspan3[|c|]{\bf Title} \crl   \noalign{\kern\hhkern}\crli
-  first & second & third  \crlli
-  seven & eight  & nine   \crli}}
-\bigskip
-
-The \^`\vspan``<number>{<text>}` shifts the <text> down in order it looks
-like to be in the center of the <number> lines (current line is first).
-You can use this for creating tables like in the following example:
-
-\begtt \typosize[8.7/11]
-\thistable{\tabstrut={\vrule height 20pt depth10pt width0pt}
-           \baselineskip=20pt \tablinespace=0pt \rulewidth=.8pt}
-\table{|8{c|}}{\crlp{3-8}
-   \mspan2[c|]{}      & \mspan3[c|]{Singular}         & \mspan3[c|]{Plural} \crlp{3-8}
-   \mspan2[c|]{}      & Neuter & Masculine & Feminine & Masculine & Feminine & Neuter \crl
-   \vspan2{I}   & Inclusive & \mspan3[c|]{\vspan2{O}} & \mspan3[c|]{X} \crlp{2,6-8}
-                & Exclusive & \mspan3[c|]{}           & \mspan3[c|]{X} \crl
-   \vspan2{II}  & Informal  & \mspan3[c|]{X}          & \mspan3[c|]{X} \crlp{2-8}
-                & Formal    & \mspan6[c|]{X} \crl
-   \vspan2{III} & Informal  & \vspan2{O} & X & X      & \mspan2[c|]{X} &\vspan2{O} \crlp{2,4-7}
-                & Formal    &                         & \mspan4[c|]{X} & \crl
-}
-\endtt
-
-\puttext 8.9cm -4cm {\pdfsave\pdfscale{.5}{.5}\rlap{%
-\thistable{\tabstrut={\vrule height 20pt depth10pt width0pt}
-           \baselineskip=20pt \tablinespace=0pt \rulewidth=.8pt}
-\table{|8{c|}}{\crlp{3-8}
-   \mspan2[c|]{}      &\mspan3[c|]{Singular} &\mspan3[c|]{Plural} \crlp{3-8}
-   \mspan2[c|]{}      & Neuter & Masculine & Feminine & Masculine & Feminine & Neuter \crl
-   \vspan2{I}   & Inclusive & \mspan3[c|]{\vspan2{O}} &\mspan3[c|] X \crlp{2,6-8}
-                & Exclusive & \mspan3[c|]{} &\mspan3[c|] X \crl
-   \vspan2{II}  & Informal  & \mspan3[c|] X &\mspan3[c|] X \crlp{2-8}
-                & Formal    & \mspan6[c|] X \crl
-   \vspan2{III} & Informal  & \vspan2{O} & X & X &\mspan2[c|] X & \vspan2{O} \crlp{2,4-7}
-                & Formal    & &\mspan4[c|] X & \crl
-}}\pdfrestore}
-
-\hangindent=-7.5cm \hangafter=0
-You can use \^`\vspan` with non-integer parameter too if you feel that the
-result looks better, for example \^`\vspan2.1{text}`.
-
-\hangindent=-7.5cm \hangafter=0
-The rule width of tables and implicit width of all `\vrule`s and `\hrule`s
-can be set by the command \^`\rulewidth=<dimen>`. The default value given
-by \TeX/ is 0.4\,pt.
-
-\hangindent=-7.5cm \hangafter=-2
-The `c`, `l`, `r` and `p` are default \"declaration letters" but you can define
-more such letters by `\def\_tabdeclare<letter>{<left>##<right>}`.
-More about it is in technical documentation in section~\ref[table.impl].
-See the definition of the \^`\_tabdeclarec` macro, for example.
-
-The `:` columns boundary declarator is described in section~\ref[table.bound].
-The tables with given width can be declared by `to<size>` or `pxto<size>`.
-More about it is in section~\ref[table.w].
-Many tips about tables can be seen on the site
-\url{http://petr.olsak.net/optex/optex-tricks.html}.
-
-\label[verbatim]\secc Verbatim
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-The display verbatim text have to be surrounded by the \^`\begtt` and
-\^`\endtt` couple.
-The in-line verbatim have to be tagged (before and after)
-by a character which is declared by
-\^`\verbchar``<char>`. For example \code{\\verbchar`}
-declares the character \code{`}
-for in-line verbatim markup.
-And you can use \code{`\\relax`} for
-verbatim `\relax` (for example).
-\new
-Another alternative of printing in-line
-verbatim text is \~`\code{<text>}` (see below).
-
-If the numerical register \^`\ttline` is set to the non-negative value then
-display verbatim will number the lines. The first line has the number
-\^`\ttline+1` and when the verbatim ends then the \^`\ttline` value is equal to the
-number of the last line printed. Next \^`\begtt...`\^`\endtt` environment will follow
-the line numbering. \OpTeX/ sets \^`\ttline=-1` by default.
-
-The indentation of each line in display verbatim is controlled by
-\^`\ttindent` register. This register is set to the `\parindent` by default.
-Users can change the values of the `\parindent` and \^`\ttindent` independently.
-
-The \^`\begtt` command starts the internal group in which the catcodes are changed.
-\new
-Then the \^`\everytt` tokens register is run. It is empty by default and the user can
-control fine behavior by it. For example, the catcodes can be re-declared here. If
-you need to define an active character in the \^`\everytt`, use \~`\adef` as in the
-following example:
-
-\begtt \adef@{\string\endtt}
-\everytt={\adef!{?}\adef?{!}}
-\begtt
-Each occurrence of the exclamation mark will be changed to
-the question mark and vice versa. Really? You can try it!
-@
-\endtt
-%
-The \~`\adef` command sets its parameter as active {\it after\/}
-the parameter of \^`\everytt` is read. So you don't have to worry about active
-categories in this parameter.
-
-There is an alternative to \^`\everytt` named \^`\everyintt` which is used for
-in-line verbatim surrounded by an \^`\verbchar` or processed by the \~`\code`
-command.
-
-The \^`\everytt` is applied to all \^`\begtt...`\^`\endtt` environments (if it is not
-declared in a group). There are tips for such global `\everytt` definitions here:
-
-\begtt \adef!{\char9251 }
-\everytt={\typosize[9/11]}  % setting font size for verbatim
-\everytt={\ttline=0}        % each listing will be numbered from one
-\everytt={\visiblesp}       % visualization!of!spaces
-\endtt
-
-\new
-If you want to apply a special code only for one \^`\begtt...`\^`\endtt`
-environment then don't set any \^`\everytt` but put desired material at the
-same line where \^`\begtt` is. For example:
-
-\begtt   \adef@{\string\endtt}
-\begtt   \adef!{?}\adef?{!}
-Each occurrence of ? will be changed to ! and vice versa.
-@
-\endtt
-
-The in-line verbatim surrounded by a \^`\verbchar` doesn't work in
-parameter of macros and macro definitions. (It works in titles declared by
-\~`\chap`, \~`\sec` etc. and in \~`\fnote`s, because these macros are
-specially defined in \OpTeX/).
-\new
-You can use more robust command \^`\code{<text>}` in problematic
-situations, but you have to escape the following characters in the <text>:
-`\`, `#`, `%`, braces (if the braces are unmatched in the <text>),
-and space or `^` (if there are more than one subsequent spaces or `^` in
-the <text>). Examples:
-
-\begtt
-\code{\\text, \%\#} ... prints \text, %#
-\code{@{..}*&^$ $}  ... prints @{..}*&^$ $ without escaping, but you can
-                        escape these characters too, if you want.
-\code{a \ b}        ... two spaces between a  b, the second must be escaped
-\code{xy\{z}        ... xy{z ... unbalanced brace must be escaped
-\code{^\^M}         ... prints ^^M, the second ^ must be escaped
-\endtt
-
-You can print verbatim listing from external files by the \^`\verbinput` command.
-Examples:
-
-\begtt
-\verbinput (12-42) program.c  % listing from program.c, only lines 12-42
-\verbinput (-60) program.c    % print from begin to the line 60
-\verbinput (61-) program.c    % from line 61 to the end
-\verbinput (-) program.c      % whole file is printed
-\verbinput (70+10) program.c  % from line 70, only 10 lines printed
-\verbinput (+10) program.c    % from the last line read, print 10 lines
-\verbinput (-5+7) program.c   % from the last line read, skip 5, print 7
-\verbinput (+) program.c      % from the last line read to the end
-\endtt
-
-\new
-You can insert additional commands for \^`\verbinput` before
-the first opening bracket. They are processed in the local group.
-For example, `\verbinput \hsize=20cm (-) program.c`.
-
-The \~`\ttline` influences the line numbering by the same way as in
-\~`\begtt...`\~`\endtt` environment. If \~`\ttline=-1` then real line numbers are
-printed (this is the default). If \code{\\ttline<-1} then no line
-numbers are printed.
-
-The \^`\verbinput` can be controlled by \^`\everytt`, \^`\ttindent` just like
-in \~`\begtt...`\~`\endtt`.
-
-The \~`\begtt`...\~`\endtt` pair or \~`\verbinput` can be used for listings of
-codes. Automatic syntax highlighting is possible, for example
-`\begtt` \^`\hisyntax{C}` activates colors for C programs. Or
-`\verbinput` \^`\hisyntax{HTML} (-) file.html` can be used for HTML or XML codes.
-\OpTeX/ implements C, Python, \TeX/, HTML and XML syntax highlighting.
-More languages can be declared, see the section~\ref[hisyntax].
-
-If the code is read by \^`\verbinput` and there are comment lines prefixed
-by two characters then
-you can set them by \~`\commentchars``<first><second>`. Such comments are
-fully interpreted by \TeX/ (i.e. not verbatim).
-Section~\ref[verb] (page \pgref[commentchars]) says more about this feature.
-
-\sec Autogenerated lists
-%%%%%%%%%%%%%%%%%%%%%%%%
-
-\secc[toc] Table of contents
-%%%%%%%%%%%%%%%%%%%%%%
-
-The \^`\maketoc` command prints the table of contents of all \~`\chap`, \~`\sec`
-and \~`\secc` used in the document. These data are read from the external `*.ref` file, so
-you have to run \TeX/ more than once (typically three times if the table of
-contents is at the beginning of the document).
-
-Typically, we don't want to repeat the name of the section \"Table of contents"
-in the table of contents again. The direct usage
-of \~`\chap` or \~`\sec` isn't recommended here because the table of contents
-is typically not referenced to itself. You can print the unnumbered and unreferenced
-title of the section like this:
-
-\begtt
-\nonum\notoc\sec Table of Contents
-\endtt
-If you need a customization of the design of the TOC, read the
-section~\ref[maketoc].
-
-\new
-If you are using a special macro in section or chapter titles
-and you need different behavior of such macro in other cases then use
-\^`\regmacro{<case-toc>}{<case-mark>}{<case-outline>}`.
-The parameters are applied locally in given cases. The \^`\regmacro` can be
-used repeatedly: then its parameters are accumulated (for more macros).
-If a parameter is empty then original definition is used in given case.
-For example:
-
-\begtt
-% default value of \mylogo macro used in text and in the titles:
-\def\mylogo{\leavevmode\hbox{{\Red\it My}{\setfontsize{mag1.5}\rm Lo}Go}}
-% another variants:
-\regmacro {\def\mylogo{\hbox{\Red My\Black LoGo}}} % used in TOC
-          {\def\mylogo{\hbox{{\it My}\/LoGo}}}     % used in running heads
-          {\def\mylogo{MyLoGo}}                    % used in PDF outlines
-\endtt
-
-\secc Making the index
-%%%%%%%%%%%%%%%%%%%%%
-
-The index can be included in the document by the \^`\makeindex` macro. No external
-program is needed, the alphabetical sorting is done inside \TeX/ at macro
-level.
-
-The \^`\ii` command (insert to index) declares the word separated by the space
-as the index item. This declaration is represented as an invisible item on the
-page connected to the next visible word. The page number of the page where
-this item occurs is listed in the index entry. So you can type:
-
-\begtt
-The \ii resistor resistor is a passive electrical component ...
-\endtt
-
-You cannot double the word if you use the \^`\iid` instead of \^`\ii`:
-
-\begtt
-The \iid resistor is a passive electrical component ...
-or:
-Now we'll deal with the \iid resistor .
-\endtt
-
-Note that the dot or comma has to be separated by space when \^`\iid` is
-used. This space (before dot or comma) is removed by the macro in
-the current text.
-
-The multiple-words entries are commonly arranged in the index as follows:
-
-\medskip
-
-linear~dependency  11, 40--50
-
---- independency 12, 42--53
-
---- space 57, 76
-
---- subspace 58
-
-\medskip
-
-To do this you have to declare the parts of the index entries by the `/` separator.
-Example:
-
-\begtt
-{\bf Definition.}
-\ii linear/space,vector/space
-{\em Linear space} (or {\em vector space}) is a nonempty set of...
-\endtt
-
-The number of the parts of one index entry (separated by `/`) is unlimited. Note, that you can
-spare your typing by the comma in the \~`\ii` parameter. The previous example
-is equivalent to `\ii linear/space \ii vector/space`~.
-
-Maybe you need to propagate to the index the similar entry to the
-linear/space in the form of space/linear. You can do this by the shorthand `,@`
-at the end of the \~`\ii` parameter. Example:
-
-\begtt
-\ii linear/space,vector/space,@
-is equivalent to:
-\ii linear/space,vector/space \ii space/linear,space/vector
-\endtt
-
-If you really need to insert the space into the index entry, write `~`.
-
-The \~`\ii` or \~`\iid` commands can be preceded by \^`\iitype` `<letter>`, then such
-reference (or more references generated by one \~`\ii`) has the specified type.
-The page numbers of such references should be formatted
-specially in the index. \OpTeX/ implements only \^`\iitype` `b`,
-\^`\iitype` `i` and \^`\iitype` `u`:
-the page number in bold or in italics or underlined is printed
-in the index when these types are used. The default index type is empty, which
-prints page numbers in normal font. The \TeX/book index is a good example.
-
-The \^`\makeindex` creates the list of alphabetically sorted index entries
-without the title of the section and without creating more columns. \OpTeX/
-provides other macros \^`\begmulti` and \^`\endmulti` for more columns:
-
-\begtt \catcode`\<=13
-\begmulti <number of columns>
-<text>
-\endmulti
-\endtt
-The columns will be balanced. The Index can be printed by the following
-code:
-
-\begtt
-\sec Index
-\begmulti 3 \makeindex \endmulti
-\endtt
-
-Only \"pure words" can be propagated to the index by the \~`\ii` command. It
-means that there cannot be any macro, \TeX/ primitive, math selector, etc.
-But there is another possibility to create such a complex index entry. Use
-\"pure equivalent" in the \~`\ii` parameter and map this equivalent to a
-real word that is printed in the index. Such mapping is done by
-\^`\iis` command. Example:
-
-\begtt
-The \ii chiquadrat $\chi$-quadrat method is ...
-If the \ii relax `\relax` command is used then \TeX/ is relaxing.
-...
-\iis chiquadrat {$\chi$-quadrat}
-\iis relax {\code{\\relax}}
-\endtt
-%
-The \^`\iis` `<equivalent> {<text>}` creates one entry in the \"dictionary
-of the exceptions". The sorting is done by the <equivalent> but the
-<text> is printed in the index entry list.
-
-The sorting rules when \^`\makeindex` runs depends on the current language.
-See section~\ref[lang] about languages selection.
-
-\secc Bib\TeX/ing
-%%%%%%%%%%%%%%%%
-
-The command \^`\cite[<label>]` (or
-\hbox{\^`\cite[<label-1>,<label-2>,...,<label-n>]`})
-creates the citation in the form [42] (or [15,~19,~26]).
-If \^`\shortcitations` is declared at the beginning of the document then
-continuous sequences of numbers are re-printed like this:
-\hbox{[3--5,~7,~9--11]}. If
-\^`\sortcitations` is declared then numbers generated by one \^`\cite` command
-are sorted upward.
-
-If \^`\nonumcitations` is declared then the marks instead of numbers are generated
-depending on the used bib-style. For example, the citations look like
-[Now08] or [Nowak, 2008].
-
-The \^`\rcite[<labels>]` creates the same list as \^`\cite[<labels>]` but without
-the outer brackets. Example: `[\rcite[tbn], pg.~13]` creates [4,~pg.~13].
-
-The \^`\ecite[<label>]{<text>}` prints the `<text>` only, but the entry labeled
-<label> is decided as to be cited. If \~`\hyperlinks` is used then <text>
-is linked to the references list.
-
-You can define alternative formating of \^`\cite` command. Example:
-
-\begtt \catcode`\<=13
-\def\cite[#1]{(\rcite[#1])}    % \cite[<label>] creates (27)
-\def\cite[#1]{$^{\rcite[#1]}$} % \cite[<label>] creates^{27}
-\endtt
-
-The numbers printed by \^`\cite` correspond to the same numbers generated in
-the list of references. There are two possibilities to generate this
-references list:
-
-\begitems
-* Manually using \~`\bib[<label>]` commands.
-* By \~`\usebib/<type> (<style>) <bib-base>` command which reads `*.bib`
-  files directly.
-\enditems
-
-\new
-Note that another two possibilities documented in OPmac (using external
-Bib\TeX/ program) isn't supported because Bib\TeX/ is an old program that does not
-support Unicode. And Biber seems to be not compliant with Plain \TeX.
-
-\medskip\noindent
-{\bf References created manually using \^`\bib[<label>]` command.}
-
-\begtt
-\bib [tbn] P. Olšák. {\it\TeX{}book naruby.} 468~s. Brno: Konvoj, 1997.
-\bib [tst] P. Olšák. {\it Typografický systém \TeX.}
-           269~s. Praha: CSTUG, 1995.
-\endtt
-
-If you are using \~`\nonumcitations` then you need to declare the <marks>
-used by \~`\cite` command. To do it you must use long form of the \^`\bib`
-command in the format \^`\bib[<label>] = {<mark>}`. The spaces around
-equal sign are mandatory. Example:
-
-\begtt
-\bib [tbn] = {Olšák, 2001}
-    P. Olšák. {\it\TeX{}book naruby.} 468~s. Brno: Konvoj, 2001.
-\endtt
-
-\noindent
-{\bf Direct reading of `.bib` files} is possible by \^`\usebib` macro.
-This macro reads and uses macro package `librarian.tex` by Paul Isambert.
-The usage is:
-
-\begtt \catcode`\<=13
-\usebib/c (<style>) <bib-base> % sorted by \cite-order (c=cite),
-\usebib/s (<style>) <bib-base> % sorted by style (s=style).
-% example:
-\nocite[*] \usebib/s (simple) op-biblist  % prints all from op-biblist.bib
-\endtt
-
-The <bib-base> is one or more `*.bib` database source files (separated by
-spaces and without extension) and the <style> is the part of the filename
-`bib-<style>.opm` where the formatting of the references list is
-defined. \OpTeX/ supports `simple` or `iso690` styles. The features of
-the `iso690` style is documented in the section~\ref[isobib] in detail.
-The \^`\usebib` command is more documented in section~\ref[usebib].
-
-Not all records are printed from <bib-base> files: the command \^`\usebib`
-selects only such bib-records which were used in \~`\cite` or \^`\nocite`
-commands in your document. The \^`\nocite` behaves as \~`\cite` but prints
-nothing. It tells only that the mentioned bib-record should be printed in the
-reference list. If \^`\nocite[*]` is used then all records from <bib-base>
-are printed.
-
-\sec Graphics
-%%%%%%%%%%%%%
-
-\secc Colors
-%%%%%%%%%%%
-
-\OpTeX/ provides a small number of color selectors:
-{\Blue `\Blue`},
-{\Red `\Red`},
-{\Brown `\Brown`},
-{\Green `\Green`},
-{\Yellow `\Yellow`},
-{\Cyan `\Cyan`},
-{\Magenta `\Magenta`},
-{`\White`},
-{\Grey `\Grey`},
-{\LightGrey `\LightGrey`} and
-`\Black`. User can define more
-such selectors by setting four CMYK components
-\new
-or three RGB components. For example
-
-\begtt
-\def \Orange {\setcmykcolor{0 0.5 1 0}}
-\def \Purple {\setrgbcolor{1 0 1}}
-\endtt
-
-\new
-The command \^`\morecolors` reads more definitions of color selectors from
-the \LaTeX/ file `x11nam.def`.
-There are about 300 color names like
-`\DeepPink`, `\Chocolate` etc. If there are numbered variants of the same
-name, then the letters B, C, etc. are appended to the name in \OpTeX/. For example
-`\Chocolate` is Chocolate1, `\ChocolateB` is Chocolate2 etc.
-
-\new
-The color selectors work locally in groups by default but with limitations. See
-the technical documentation, section~\ref[colors] for more information.
-
-The basic colors \^`\Blue`, \^`\Red`, \^`\Cyan`, \^`\Yellow` etc.\ are defined
-with CMYK components using \^`\setcmykcolor`.
-On the other hand, you can define a color with three
-RGB components and \^`\morecolors` defines such RGB colors.
-By default, the color model isn't converted but only stored to
-PDF output for each used color. Thus, there may be a mix of color
-models in the PDF output which is not a good idea. You can overcome this
-problem by declaration \^`\onlyrgb` or \^`\onlycmyk`. Then only the selected color
-model is used for PDF output and if a used color is declared by another color
-model then it is converted.
-The \^`\onlyrgb` creates colors more bright (usable for computer
-presentations). On the other hand, CMYK makes colors more true\fnote
-{Printed output is more equal to the monitor preview especially if you are
-using ICC profile for your printer.}
-for printing.
-
-\new
-You can define your color by a linear combination of previously defined colors using
-\^`\colordef`. For example:
-
-\begtt
-\colordef \myCyan {.3\Green + .5\Blue}  % 30 % green, 50 % blue, 20% white
-\colordef \DarkBlue {\Blue + .4\Black}  % Blue mixed with 40 % of black
-\colordef \myGreen{\Cyan+\Yellow}       % exact the same as \Green
-\colordef \MyColor {.3\Orange+.5\Green+.2\Yellow}
-\endtt
-%
-The linear combination is done in CMYK subtractive color space by default
-(RGB colors used in \^`\colordef` argument are converted first).
-If the resulting component is greater than 1 then it is truncated to 1.
-If a convex linear combination (as in the last example above) is used then it
-emulates color behavior on a painter's palette.
-You can use \^`\rgbcolordef` instead of \^`\colordef` if you want to mix colors
-in the additive RGB color space.
-
-\def\coloron#1#2#3{%
-   \setbox0=\hbox{{#2#3}}\leavevmode
-   \localcolor \rlap{#1\strut \vrule width\wd0}\box0
-}
-The following example defines the macro for the
-\coloron\Yellow\Brown{colored text on the colored background}. Usage:
-`\coloron<background><foreground>{<text>}`
-
-The `\coloron` can be defined as follows:
-
-\begtt
-\def\coloron#1#2#3{%
-   \setbox0=\hbox{{#2#3}}%
-   \leavevmode \rlap{#1\strut \vrule width\wd0}\box0
-}
-\coloron\Yellow\Brown{The brown text on the yellow background}
-\endtt
-
-\secc Images
-%%%%%%%%%%%
-
-The \^`\inspic` `{<filename>.<extension>}` or
-\^`\inspic` `<filename>.<extension><space>`
-inserts the picture stored in
-the graphics file with the name `<filename>.<extension>` to the document.
-You can set the picture width by \^`\picw=<dimen>`
-before \^`\inspic` command which declares the width of the picture.
-The image files can be in the PNG, JPG, JBIG2 or PDF format.
-
-The \^`\picwidth` is an equivalent register to `\picw`. Moreover, there is an
-\^`\picheight` register which denotes the height of the picture. If both
-registers are set then the picture will be (probably) deformed.
-
-The image files are searched in \^`\picdir`. This token list is empty
-by default, this means that the image files are searched in the
-current directory. Example: \^`\picdir={img/}` supposes that image files are
-in `img` subdirectory. Note: the directory name must end by `/` in
-the \^`\picdir` declaration.
-
-Inkscape\fnote
-{A powerful and free Wysiwyg editor for creating vector graphics.}
-is able to save a picture to PDF and labels of the picture to another
-file\fnote
-{Chose \"Omit text in PDF and create LaTeX file" option.}.
-This second file should be read by \TeX/to print labels
-in the same font as document font. \OpTeX/ supports this feature by
-\^`\inkinspic` `{<filename>.pdf}` command. It reads and displays
-both: PDF image and labels generated by Inkscape.
-
-If you want to create vector graphics (diagrams, schema, geometry
-skicing) then you can do it by Wysiwyg graphics editor (Inkscape, Geogebra for
-example), export the result to PDF and include it by \^`\inspic`.
-If you want to \"program" such pictures then Tikz package is recommended.
-It works in Plain \TeX/ and \OpTeX.
-
-\secc PDF transformations
-%%%%%%%%%%%%%%%%%%%%%%%%
-
-All typesetting elements are transformed by linear
-transformation given by the current transformation matrix. The
-`\pdfsetmatrix` `{<a> <b> <c> <d>}` command makes the internal multiplication
-with the current matrix so linear transformations can be composed.
-One linear transformation given by the `\pdfsetmatrix` above transforms
-the vector $[0,1]$ to [<a>,\,<b>] and $[1,0]$ to [<c>,\,<d>].
-The stack-oriented commands `\pdfsave` and `\pdfrestore` gives a possibility of
-storing and restoring the current transformation matrix and the position of the current point.
-This position has to be the same from \TeX{}'s point of
-view as from the transformation point of view when `\pdfrestore` is processed.
-Due to this fact the `\pdfsave\rlap{<transformed text>}\pdfrestore`
-or something similar is recommended.
-
-\OpTeX/ provides two special transformation macros
-\^`\pdfscale` and \^`\pdfrotate`:
-
-\begtt \catcode`\<=13
-\pdfscale{<horizontal-factor>}{<vertical-factor>}
-\pdfrotate{<angle-in-degrees>}
-\endtt
-
-These macros simply call the properly `\pdfsetmatrix` command.
-
-It is known that the composition of transformations is not commutative. It
-means that the order is important. You have to read the transformation
-matrices from right to left. Example:
-
-\begtt
-First: \pdfsave \pdfrotate{30}\pdfscale{-2}{2}\rlap{text1}\pdfrestore
-      % text1 is scaled two times and it is reflected about vertical axis
-      % and next it is rotated by 30 degrees left.
-second: \pdfsave \pdfscale{-2}{2}\pdfrotate{30}\rlap{text2}\pdfrestore
-      % text2 is rotated by 30 degrees left then it is scaled two times
-      % and reflected about vertical axis.
-third: \pdfsave \pdfrotate{-15.3}\pdfsetmatrix{2 0 1.5 2}\rlap{text3}%
-       \pdfrestore % first slanted, then rotated by 15.3 degrees right
-\endtt
-%
-\par\nobreak\bigskip\smallskip
-This gives the following result.
-First: \pdfsave \pdfrotate{30}\pdfscale{-2}{2}\rlap{text1}\pdfrestore
-second: \pdfsave \pdfscale{-2}{2}\pdfrotate{30}\rlap{text2}\pdfrestore
-third: \pdfsave \pdfrotate{-15.3}\pdfsetmatrix{2 0 1.5 2}\rlap{text3}\pdfrestore
-\par\nobreak\bigskip\penalty0%\bigskip
-
-You can see that \TeX/ knows nothing about dimensions of transformed material,
-it treats it as with a zero dimension object.
-\new
-The \^`\transformbox{<transformation>}{<text>}`
-macro solves the problem. This macro puts the transformed
-material into a box with relevant dimensions. The <transfromation> parameter
-includes one or more transformation commands `\pdfsetmatrix`, `\pdfscale`,
-`\pdfrotate` with their parameters. The <text> is transformed text.
-
-Example: \~`\frame{\transformbox{\pdfscale{1}{1.5}\pdfrotate{-10}}{moj}}`
-creates \frame{\transformbox{\pdfscale{1}{1.5}\pdfrotate{-10}}{moj}}.
-
-The \^`\rotbox{<deg>}{<text>}` is shortcut for
-\^`\transformbox{\pdfrotate{<deg>}}{<text>}`.
-
-\secc Ovals, circles
-%%%%%%%%%%%%%%%%%%%%
-
-\new
-The \^`\inoval{<text>}` creates a box like this: \inoval{text}.
-Multiline text can be put in an oval by the command \^`\inoval{\vbox{<text>}}`.
-Local settings can be set by
-\^`\inoval[<settings>]{<text>}` or you can re-declare global settings by
-\^`\ovalparams={<settings>}`. The default settings are:
-
-\begtt
-\ovalparams={\roundness=2pt           % diameter of circles in the corners
-             \fcolor=\Yellow          % color used for filling oval
-             \lcolor=\Red             % line color used in the border
-             \lwidth=0.5bp            % line width in the border
-             \shadow=N                % use a shadow effect
-             \overlapmargins=N        % ignore margins by surrounding text
-             \hhkern=0pt \vvkern=0pt} % left-righ margin, top-bottom margin
-\endtt
-The total distance from text to oval boundary is `\hhkern+\roundness` at the left and right
-sides and
-`\vvkern+\roundness` at the top and bottom sides of the text.
-
-If you need to set a parameters for the <text> (color, size, font etc.),
-put such setting right in front of the <text>:
-\^`\inoval{<text settings><text>}`.
-
-\new
-The \^`\incircle[\ratio=1.8]{<text>}` creates a box like this \incircle[\ratio=1.8]{text}.
-The \^`\ratio` parameter means width/height. The usage is analogical like for oval.
-The default parameters are
-
-\begtt
-\circleparams={\ratio=1 \fcolor=\Yellow \lcolor=\Red \lwidth=0.5bp
-               \shadow=N \ignoremargins=N \hhkern=2pt \vvkern=2pt}
-\endtt
-
-\new
-The macros \^`\clipinoval` `<x> <y> <width> <height> {<text>}`
-and \^`\clipincircle` (with the same parameters)
-print the `<text>` when a clipping path (oval or cirle with given
-`<with>` and `<height>` shifted its center by `<x>` to right and by `<y>` to up)
-is used.
-The `\roundness=5mm` is default for \^`\clipinoval` and user can change it.
-Example:
-
-\begtt
-\clipincircle 3cm 3.5cm 6cm 7cm {\picw=6cm \inspic{myphoto.jpg}}
-\endtt
-
-\secc Putting images and texts wherever
-
-\new
-The \^`\puttext` `<x> <y> {<text>}` puts the `<text>` shifted by `<x>` right and by
-`<y>` up from the current point of typesetting and does not change the
-position of the current point. Assume a coordinate system with origin in the
-current point. Then \^`\puttext` `<x> <y> {<text>}` puts the text at the
-coordinates `<x>`, `<y>`. More exactly the left edge of its baseline is at that
-position.
-
-\new
-The \^`\putpic` `<x> <y> <width> <height> {<image-file>}` puts an image
-given by `<image-file>` (including extension) of given
-`<width>` and `<height>` at given position (its left-bottom corner).
-You can write \^`\nospec` instead `<width>` or `<height>` if this parameter
-is not specified.
-
-\sec Others
-%%%%%%%%%%%
-
-\secc[lang] Using more languages
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-\OpTeX/ prepares hyphenation patterns for all languages if such patterns are
-available in your \TeX/ system.
-\new
-Only USenglish patterns (original from Plain \TeX/) are preloaded.
-Hyphenation patterns of all other languages are loaded on demand when you first use
-the `\<iso-code>lang` command in your document.
-For example \^`\delang` for German, \^`\cslang` for
-Czech, \^`\pllang` for Polish. The <iso-code> is a shortcut
-of the language (mostly from ISO 639-1).
-You can list all available languages by \^`\langlist`
-macro. This macro prints now:
-
-\medskip
-{\typosize[8.5/11.5]\emergencystretch=4em \hbadness=4000
-\noindent \langlist
-\par}
-\medskip
-
-\new
-For compatibility with e-plain macros, there is the command
-\^`\uselanguage{<language>}`. The parameter <language> is long-form of
-language name, i.e.\ \^`\uselanguage{Czech}` works the same as \^`\cslang`.
-The \^`\uselanguage` parameter is case insensitive.
-
-For compatibility with \csplain/, there are macros \^`\ehyph`, \^`\chyph`,
-\^`\shyph` which are equivalent to \^`\enlang`, \^`\cslang` and \^`\sklang`.
-
-You can switch between language patterns by `\<iso-code>lang` commands mentioned
-above. Default is \^`\enlang`.
-
-\OpTeX/ generates three phrases used for captions and titles in technical
-articles or books: \"Chapter", \"Table" and \"Figure". These phrases need to be known
-in used language and it depends on the previously used language selectors
-`\<iso-code>lang`. \OpTeX/ declares these words only for few languages:
-\new
-Czech, German, Spanish, French, Greek, Italian, Polish, Russian, Slovak and
-English, If you need to use these words in other languages or you want to
-auto-generate more words in your macros, then you can declare it by
-\~`\sdef` or \^`\_langw` commands as shown in section~\ref[langphrases].
-
-The \~`\makeindex` command needs to know the sorting rules used in your language.
-\OpTeX/ defines only a few language rules for sorting: Czech,
-Slovak and English. How to declare sorting rules for more languages are
-described in the section~\ref[makeindex].
-
-If you declare `\<iso-code>quotes`, then the control sequences `\"` and `\'`
-should be used like this: `\"<quoted text>"` or `\'<quoted text>'`
-(note that the terminating character is the same but it isn't escaped).
-This prints language-dependent normal or alternative quotes around
-<quoted text>. The language is specified by <iso-code>. \OpTeX/ declares
-quotes only for Czech, German, Spanish, French, Greek, Italian, Polish,
-Russian, Slovak and English (\^`\csquotes`, \^`\dequotes`, \dots, \^`\enquotes`).
-You can simply define your own quotes as shown in section~\ref[langphrases].
-The `\"` is used for quotes visually more similar to the `"` character which
-can be primary quotes or secondary quotes depending on the language rules.
-Maybe you want to alternate the meaning of these two types of quotes. Use
-`\<isocode>quotes\altquotes` in such case.
-
-\secc[styles] Pre-defined styles
-%%%%%%%%%%%%%%%%%%%%%%%
-
-\OpTeX/ defines three style-declaration macros \~`\report`, \~`\letter` and
-\~`\slides`. You can use them at the beginning of your document if you are
-preparing these types of documents and you don't need to create your own
-macros.
-
-The \^`\report` declaration is intended to create reports. It
-sets default font size to 11\,pt and `\parindent` (paragraph indentation) to 1.2\,em.
-The `\tit` macro uses smaller font because we assume that \"chapter level"
-will be not used in reports. The first page has no page number, but the next pages
-are numbered (from number~2). Footnotes are numbered from one in the whole
-document. The macro `\author <authors><end-line>` can be used when
-\^`\report` is declared. It prints `<authors>` in italics at the center of the
-line. You can separate authors by `\nl` to more lines.
-
-The \^`\letter` declaration is intended to create letters.
-See the files `op-letter-*.tex` for examples.
-The \^`\letter` style sets default
-font size to 11\,pt and `\parindent` to 0\,pt. It sets half-line space
-between paragraphs. The page numbers are not printed. The \^`\subject` macro
-can be used, it prints the word \"Subject:" or \"Věc" (or something else
-depending on current language) in bold. Moreover, the \^`\address` macro
-can be used when \^`\letter` is declared. The usage of the \^`\address` macro
-looks like:
-
-\begtt \catcode`\<=13
-\address
-  <first line of address>
-  <second line of address>
-  <etc.>
-  <empty line>
-\endtt
-
-It means that you need not use any special mark at the end of lines: the ends
-of lines in the source file are the same as in printed output. The
-\^`\address` macro creates `\vtop` with address lines. The width of such
-`\vtop` is equal to the widest line used in it. So, you can use
-`\hfill\address...` to put the address box to the right side of the
-document. Or you can use `<prefixed text>\address...` to put
-`<prefixed text>` before the first line of the address.
-
-The \^`\slides` style creates a simple presentation slides. See an example
-in the file `op-slides.tex`. Run `optex op-slides.tex` and see the documentation of
-\^`\slides` style in the file `op-slides.pdf`.
-
-Analogical declaration macro `\book` is not prepared. Each book needs
-individual typographical care. You need to create specific macros for
-design.
-
-\secc Loading other macro packages
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-You can load more macro packages by `\input{<file-name>}` or by
-\^`\load[<file-names>]`. The first case (`\input`) is \TeX/ primitive command, it can be
-used in the alternative old syntax `\input <filename><space>` too. The
-second case (\^`\load`) allows specifying a comma-separated list of included files.
-Moreover, it loads each macro file only once, it sets
-temporarily standard category codes during loading and it tries to
-load `<filename>.opm` or `<filename>.tex` or `<filename>`, the first occurence
-wins. Example:
-\begtt
-\load [qrcode, tikz]
-\endtt
-%
-does `\input qrcode.opm` \,and `\input tikz.tex` \,and it saves
-local information about the fact that these file names
-`qrcode` and `tikz` were already used, i.\,e. next \^`\load` will skip them.
-
-It is strongly recommended to use the `\load` macro for loading external
-macros if you need them. On the other hand, if your source document is structured
-to more files (with individual chapters or sections), use simply the `\input` primitive.
-
-The macro packages intended to \OpTeX/ have the name `*.opm`.
-The following packages are distributed as part of \OpTeX/:
-\begitems
-* `qrcode.opm` enables to create QR codes.
-* `vlna.opm` enables to protect of one-letter prepositions and more things automatically.
-* `emoji.opm` defines `\emoji{<name>}` command for colored emoticons.
-* `plain-at.opm` defines the old names from plain \TeX/.
-\enditems
-See the directory `optex/pkg/` and these files for more information about
-them.
-
-\secc Lorem ipsum dolor sit
-%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-\new
-A designer needs to concentrate on the design of the output and maybe he/she
-needs material for testing macros. There is the possibility to generate a
-neutral text for such experiments. Use \^`\lorem[<number>]` or
-\^`\lorem[<from>-<to>]`. It prints a paragraph (or paragraphs) with neutral
-text. The numbers <number> or <from>, <to> must be in the range 1 to 150
-because there are 150 paragraphs with neutral text prepared for you.
-The \^`\lipsum` macro is equivalent to \^`\lorem`. Example: \^`\lipsum[1-150]`
-prints all prepared paragraphs.
-
-\secc Logos
-%%%%%%%%%%
-
-\new
-The control sequences for typical logos can be terminated by optional `/`
-which is ignored when printing. This makes logos more legible in the source file:
-
-\begtt
-We are using \TeX/ because it is cool. \OpTeX/ is better than \LaTeX.
-\endtt
-
-\secc The last page
-%%%%%%%%%%%%%%%%%%%
-
-The number of the last page (it may be different from the number of pages) is
-expanded by \^`\lastpage` macro. It expands to `?` in first \TeX/ run and to
-the last page in next \TeX/ runs.
-
-There is an example for footlines in the format \"current page / last page":
-
-\begtt
-\footline={\hss \fixedrm \folio/\lastpage \hss}
-\endtt
-
-\new
-The \^`\lastpage` expands to the last \^`\folio` which is a decimal
-number or Roman numeral (when \^`\pageno` is negative). If you need to know
-the total pages used in the document, use \^`\totalpages` macro. It expands to
-zero (in first \TeX/ run) or to the number of all pages in the document
-(in next \TeX/ runs).
-
-\secc Use \OpTeX/
-%%%%%%%%%%%%%%%%%
-
-\new
-The command \^`\useOpTeX` (or \^`\useoptex`) does nothing in \OpTeX/ but it causes
-an error (undefined control sequence) when another format is used. You can
-put it as the first command in your document:
-
-\begtt
-\useOpTeX % we are using OpTeX format, no LaTeX :)
-\endtt
-
-\sec Summary
-%%%%%%%%%%%%
-
-\def\ttref#1'{\ea\~\ea`\csname#1\endcsname`}
-
-\begtt \typosize[9/11]\adef&{\kern.25em}\adef~#1'{\ea\~\ea`\csname#1\endcsname`}
-~tit' Title (terminated by end of line)
-~chap' Chapter Title (terminated by end of line)
-~sec' Section Title (terminated by end of line)
-~secc' Subsection Title (terminated by end of line)
-
-~maketoc'         % table of contents generation
-~ii' item1,item2  % insertion the items to the index
-~makeindex'       % the index is generated
-
-~label' [labname]  % link target location
-~ref' [labname]    % link to the chapter, section, subsection, equation
-~pgref' [labname]  % link to the page of the chapter, section, ...
-
-~caption'/t  % a numbered table caption
-~caption'/f  % a numbered caption for the picture
-~eqmark'     % a numbered equation
-
-~begitems'       % start a list of the items
-~enditems'       % end of list of the items
-~begblock'       % start a block of text
-~endblock'       % end of block of text
-~begtt'          % start a verbatim text
-~endtt'          % end verbatim text
-~verbchar' X     % initialization character X for in-text verbatim
-~code'           % another alternative for in-text verbatim
-~verbinput'      % verbatim extract from the external file
-~begmulti' num   % start multicolumn text (num columns)
-~endmulti'       % end multicolumn text
-
-~cite' [labnames]  % refers to the item in the lits of references
-~rcite' [labnames] % similar to \cite but [] are not printed.
-~sortcitations' ~shortcitations' ~nonumcitations' % cite format
-~bib' [labname]  % an item in the list of references
-~usebib'/? (style) bib-base % direct using of .bib file, ? in {s,c}
-
-~load' [filenames]     % loadaing macro files
-~fontfam' [FamilyName] % selection of font family
-~typosize' [font-size/baselineskip] % size setting of typesetting
-~typoscale' [factor-font/factor-baselineskip] % size scaling
-~thefontsize' [size] ~thefontscale' [factor]   % current font size
-
-~inspic' file.ext    % insert a picture, extensions: jpg, png, pdf
-~table' {rule}{data} % macro for the tables like in LaTeX
-
-~fnote' {text}   % footnote (local numbering on each page)
-~mnote' {text}   % note in the margin (left or right by page number)
-
-~hyperlinks' {color-in}{color-out} % PDF links activate as clickable
-~outlines' {level}   % PDF will have a table of contents in the left tab
-
-~magscale'[factor]  % resize typesetting, line/page breaking unchanged
-~margins'/pg format (left, right, top, bottom)unit % margins setting
-
-~report' ~letter' ~slides'  % style declaration macros
-\endtt
-
-\sec API for macro writers
-%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-All \TeX/ primitives and almost all \OpTeX/ macros are accesible by two
-names: `\foo` (public or user name space) and `\_foo` (private name space).
-For example `\hbox` and `\_hbox` means the same \TeX/ primitive. More about
-it is documented in section~\ref[prefixed].
-
-If this manual refers `\foo` then `\_foo` equivalent exists too. For example,
-we mention the `\addto` macro below. The `\_addto` equivalent exists too, but it
-is not explicitly mentioned here. If we refer only `\_foo` then its public
-equivalent does not exist. For example, we mention the `\_codedecl` macro below, so
-this macro is not available as `\codedecl`.
-
-If you are writing a document or macros specific for the document, then use
-simply user namespace (`\foo`). If you are writing more general macros,
-then use private namespace (`\_foo`), but you should declare your own namespace
-by \~`\_namespace` macro and you have to follow the naming discipline described in
-section~\ref[pkg-namespace].
-
-The alphabetically sorted list of macros typically usable for macro writers follows.
-More information about such macros can be found in the technical documentation.
-You can use hyperlinks here in order to go to the appropriate place of the technical
-documentation.
-
-\medskip \noindent
-\^`\addto`` \macro{<text>}` adds <text> at the end of `\macro` body.\nl
-\^`\adef` `<char>{<body>}` defines <char> active character with meaning <body>.\nl
-\^`\afterfi` `{<text>}<ignored>\fi` expands to `\fi<text>`.\nl
-\^`\bp`` {<dimen expression>}` expands \TeX/ dimension to decimal number in `bp` without unit.\nl
-\~`\_codedecl`` <sequence> {<info>}` is used at beginning of macro files.\nl
-\~`\colordef`` \macro {<mix of colors>}` declares `\macro` as color switch.\nl
-\^`\cs` `{<string>}` expands `\<string>`.\nl
-\~`\_doc` `...` \~`\_cod` encloses documenation text in the macro code.\nl
-\^`\eoldef`` \macro #1{<body>}` defines `\macro` with parameter separated to end of line.\nl
-\~`\_endcode` closes the part of macro code in macro files.\nl
-\~`\_endnamespace` closes name space declared by \~`\_namespace`.\nl
-\~`\eqbox`` [<label>]{<text>}` creates `\hbox{<text>}` with common width across whole document.\nl
-\^`\expr`` {<expression>}` expands to result of the <expression> with decimal numbers.\nl
-\~`\fontdef`` \f {<font spec.>}` declares `\f` as font switch.\nl
-\~`\fontlet` `\fa=\fb <sizespec.>` declares `\fa` as the same font switch
-   like `\fb` at given <sizespec.>.\nl
-\^`\foreach` `<list>\do <parameters>{<what>}` is exapandable loop over <list>.\nl
-\^`\foreachdef` `\macro <parameters>{<what>}` declares expandable `\macro` as loop over <list>.\nl
-\^`\fornum` `<from>..<to>\do {<what>}` is expanadable loop with numeric variable.\nl
-\^`\incr` `<counter>` increases and \^`\decr` `<counter>` decreases `<counter>` by one globally.\nl
-\^`\ignoreit` `<one>`, \^`\ignoresecond` `<one><two>` ignores given parameter.\nl
-`\expandafter` \^`\ignorept` `\the<dimen>` expands to decimal number <dimen> without `pt`.\nl
-\~`\isempty`, \~`\istoksempty`, \~`\isequal`, \~`\ismacro`, \~`\isdefined`, \~`\isinlist`
-\~`\isfile`, \~`\isfont` do various tests. Example: \~`\isinlist\list{<text>}\iftrue` does
-   `\iftrue` if <text> is in `\list`.\nl
-\^`\isnextchar`` <char>{<text1>}{<text2>}` performs <text1> if next
-   character is <char>, else <text2>.\nl
-\~`\kv` `{<key>}` expands to value when key-value parameters are used.\nl
-\^`\loop` `...` \^`\repeat` is classical Plain \TeX/ loop.\nl
-\^`\mathstyles`` {<math list>}` enables to create macros dependent on current math style.\nl
-\~`\_namespace`` {<pkg>}` declares name space used by package writers.\nl
-\^`\newcount`, \^`\newdimen` etc. are classical Plain \TeX/ allocators.\nl
-\^`\newif` `\iffoo` declares boolean `\iffoo` as in Plain \TeX/.\nl
-\^`\_newifi` `\_iffoo` declares boolean `\_iffoo`.\nl
-\^`\opinput`` {<filename>}` reads file like `\input` but with standard catcodes.\nl
-\^`\optdef`` \macro [<opt-default>] <parameters>{<body>}` defines `\macro` with [opt.parameter].\nl
-\^`\opwarning` `{<text>}` prints <text> to the terminal and .log file as warning.\nl
-\~`\private`` <sequence> <sequence> ... ;` declares <sequence>s for private name space.\nl
-\~`\public`` <sequence> <sequence> ... ;` declares <sequence>s for public name space.\nl
-\~`\readkv` `\macro` reads parameters from `\macro` in key-value format.\nl
-\^`\replstring`` \macro{<stringA>}{<stringB>}` replaces all <stringA> to <stringB> in `\macro`.\nl
-\^`\sdef` `{<string>}<parameters>{<body>}` behaves like `\def\<string><parameters>{<body>}`.\nl
-\^`\setctable` and \^`\restorectable` manipulate with stack of catcode tables.\nl
-\^`\slet` `{<stringA>}{<stringB>}` behaves like `\let\<stringA>=\<stringB>`\nl
-\^`\sxdef` `{<string>}<parameters>{<body>}` behaves like `\xdef\<string><parameters>{<body>}`.\nl
-\^`\trycs`` {<string>}{<text>}` expands `\<string>` if it is defined else expands <text>.\nl
-\^`\useit` `<one>`, \^`\usesecond` `<one><two>` uses given parameter.\nl
-\^`\wlog`` {<text>}` writes <text> to .log file.\nl
-\^`\wterm`` {<text>}` writes <text> to the terminal and .log file.\nl
-\^`\xargs`` <what> <token> <token> ... ;` repeats <what><token> for each <token>.\nl
-\unpenalty\unskip
-
-\sec Compatibility with Plain \TeX/
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-All macros of Plain \TeX/ are re-written in \OpTeX/. Common macros should
-work in the same sense as in original Plain \TeX. Internal control sequences
-like `\p@` or `\f@@t` are removed and mostly replaced by control sequences
-prefixed by `_` (like `\_this`). If you need to use the basic set of old Plain
-\TeX/ control sequences like `\p@` (for example you are reading an old macro file),
-use `\load[plain-at]`.
-
-All primitives and common macros have two
-control sequences with the same meaning: in prefixed and unprefixed form.
-For example `\hbox` is equal to `\_hbox`.
-Internal macros of \OpTeX/ have and use only prefixed form. User should use
-unprefixed forms, but prefixed forms are accessible too because the `_` is
-set as a letter category code globally (in macro files and users document too). User
-should re-define unprefixed forms of control sequences without worries that
-something internal will be broken (only the sequence `\par` cannot be
-re-defined without change of internal \TeX/ behavior because it is
-hard-coded in \TeX/, unfortunately).
-
-\new
-The Latin Modern 8bit fonts instead Computer Modern 7bit fonts are
-preloaded in the format, but only a few ones. The full family set is ready to
-use after the command \~`\fontfam[LMfonts]` which reads the fonts in OTF
-format.
-
-\new
-Plain \TeX/ defines `\newcount`, `\bye` etc. as `\outer` macros. \OpTeX/
-doesn't set any macro as `\outer`. Macros like `\TeX`, `\rm` are defined as
-`\protected`.
-
-\new
-The text accents macros `\"`, `\'`, `\v`, `\u`, `\=`, `\^`, `\.`, `\H`,
-`\~`, \code{\\`}, `\t`   are undefined\fnote
-{The math accents macros like `\acute`, `\bar`, `\dot`, `\hat` still work.}
-in \OpTeX/. Use real
-letters like á, ř, ž in your source document instead of these old accents macros.
-If you really want to use them, you can initialize them by the \^`\oldaccents`
-command. But we don't recommend it.
-
-\new
-The default paper size is not set as the letter with 1\,in margins but as A4 with
-2.5\,cm margins. You can change it, for example by
-\^`\margins/1 letter (1,1,1,1)in`. This example sets the classical Plain \TeX/
-page layout.
-
-\new
-The origin for the typographical area is not at the top left 1\,in 1\,in coordinates
-but at the top left paper corner exactly. For example, `\hoffset` includes directly left
-margin.
-
-The tabbing macros `\settabs`\iindex{settabs} and `\+` (from Plain \TeX/)
-are not defined in \OpTeX/ because they are obsolete. But you can use the
-\ulink[http://petr.olsak.net/optex/optex-tricks.html\#tabs]{\OpTeX/ trick 0021}
-if you really need such feature.
-
-The `\sec` macro is reserved for sections but original Plain \TeX/ declares this
-control sequence for math secans.
-
-\enddocument
-
-
-\sec Dependencies
-%%%%%%%%%%%%%%%%%
-
-When `optex.fmt` is created then the following must be installed
-
-\begitems
-* The `\luatex` program.
-* Latin moder font metrics
-  `ec-lmr10.tfm`, `ec-lmbx10.tfm`, `ec-lmri10.tfm`,
-  `ec-lmbxi10.tfm`, `ec-lmtt10.tfm` (for basic text font initializing).
-* Computer rmodern font metrics
-  `cmr10.tfm`, `cmmi10.tfm`, `cmsy10.tfm`, `cmex10.tfm` (for basic math
-  initializing). If there are more Computer Modern fonts then they are read
-  too.
-* The file `hyphen.tex` form plain \TeX.
-\enditems
-
-When `\fontfam` is used  then the ability of Unicode fonts reading
-is initialized using Lua scripts: `ltluatex.lua` (from \LaTeX/ package),
-`luaotfload-main.lua` and more 20 similar `.lua` files (from `luaotfload`
-package).
-
-When a font family is needed using `\fontfam` then such font family must be
-installed in the OTF format otherwise, the `\fontfam` command is ignored
-(only warning about no-existent font family is printed).
-
-When `\cslang`, `\delang` etc. commands are used in the document
-then the hyphenation patterns of relevant languages must be installed.
-Moreover the Lua script `luatex-hyphen.lua` (from `hyph-utf8` package)
-and data file `language-dat.lua` (from `hyphen-base` package)
-must be installed.
-
-When `\usebib` command is used then `librarian.tex` file
-(from the `librarian` macro package) must be installed.
-
-When `\morecolors` command is used then `x11nam.def` file
-(from the `xcolor` package) must be installed.
-
-When `\lorem` command is used then `lipsum.ltd.tex` file
-(from the `lipsum` package) must be installed.
-