CTAN sync 202201040301

10 files changed, 595 insertions, 76 deletions

diff --git a/macros/latex/contrib/wrapfig2/README.txt b/macros/latex/contrib/wrapfig2/README.txt
index 38d2c8a284..c6f5011111 100644
--- a/macros/latex/contrib/wrapfig2/README.txt
+++ b/macros/latex/contrib/wrapfig2/README.txt
@@ -1,5 +1,5 @@
 %%%% README.txt file
-This README.txt for package wrapfig2[2021-12-25 v.4.0 ...]
+This README.txt for package wrapfig2[2022-01-03 v.4.0.1 ...]
 
 This work is author maintained
 
diff --git a/macros/latex/contrib/wrapfig2/wrapfig2.dtx b/macros/latex/contrib/wrapfig2/wrapfig2.dtx
index 5b6d9f8813..36b142c967 100644
--- a/macros/latex/contrib/wrapfig2/wrapfig2.dtx
+++ b/macros/latex/contrib/wrapfig2/wrapfig2.dtx
@@ -45,7 +45,7 @@ wrapfig2.sty and wrapfig2.pdf, plus the auxiliary file README.txt.
 %<+package>\ProvidesPackage{wrapfig2}%
 %^^A<+readme>File README.txt for package wrapfig2
 %<*package|readme>
-        [2021-12-21 v.4.0 Wrapfig extended]
+        [2022-01-03 v.4.0.1 Wrapfig extended]
 %</package|readme>
 %<*driver>
 %
@@ -217,25 +217,27 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 %
 % The original software had some idiosyncrasies; Donald Arseneau
 % described them in the documentation of his package; I am sorry
-% to say that such idiosyncrasies have not been reduced; but in any case
-% the solution is to wrap the inserted object with a sufficient
-% number of lines, i.e. by a sufficiently long paragraph.
-%
-% The above implies that no wrapped object code should be inserted
-% by the end of a paragraph; again no object code should be inserted
-% within any list; not even close to the end or to the
-% beginning of section. Arseneau's code is capable of
+% to say that such idiosyncrasies have not been reduced; but in
+% any case in order to avoid such peculiar anomalies, it is
+% sufficient to wrap the inserted object with a reasonable
+% number of lines, i.e. by a reasonably long paragraph.
+%
+% The above implies that no wrapped object code should be specified
+% in the source file close the end of a paragraph; again no object
+% code should be inserted within any list; not even close to the end
+% or to the beginning of section. Arseneau's code is capable of
 % specifying the wrapping number of lines such that two or more
 % paragraphs can be indented so as to wrap a longish insertion,
 % but it is wise to avoid such risky situations. Moreover, if the
 % inserted figure or table has a numbered caption, the number might
-% not result in the correct order with the normal corresponding
+% not result in the correct sequence of the normal corresponding
 % floating objects.
 %
 % Therefore the usefulness of the wrapping procedure depends very
 % much from the document author ability to move around his/her code
 % until a suitable position is found. Certainly a good place is
-% within a longish first section at the beginning of a new chapter.
+% within a longish first section paragraph at the beginning of a
+% new chapter.
 %
 % The code of this package does not do anything to correct such
 % idiosyncrasies. They are caused by the limitations of the
@@ -246,17 +248,17 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 % \meta{number of indented lines} argument does not mean the total
 % number, but the correction number to add-to or subtract-from to the
 % value computed by the default mechanism devised by Arseneau. We assume
-% that any user first uses the software to insert an object to be wrapped
+% that all user first use the software to insert an object to be wrapped
 % by the surrounding text without specifying any value with the
-% specific optional argument; then evaluates the result, and if the
+% specific optional argument; then they evaluate the result, and if the
 % space below the wrapped object is too large, or if such space is
-% too small s/he counts the necessary number of lines and specifies
+% too small they count the necessary number of lines and specify
 % it to be processed during another document compilation. When the
 % object to be wrapped is tall, it is very easy to miscount the
 % necessary number of lines, while is is very easy to evaluate the
 % necessary small correction to the default computed value.
 %
-% A third purpose of this package is to define a new environment,
+% A furher purpose of this package is to define a new environment,
 % \Env{wraptext}, to wrap a framed text block typeset on a grey
 % background as if it were a figure. On \texttt{texstackexchange}
 % a solution was suggested to a user who was asking for such an
@@ -269,11 +271,11 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 % of the indented lines number would still be necessary. We added also
 % the possibility of optionally specifying the measure of the
 % wrapped text, even if this measure should not be too different
-% from a half of the wrapping text measure: with a value too different
-% from \texttt{0.5\cs{linewidth}} either the wrapped text has problems
-% with inter word spaces and hyphenation because of the small measure,
-% or, on the opposite, the indented lines of the wrapping text have
-% similar problems.
+% from a half of the wrapping text measure.In facts, with a value too
+% different from \texttt{0.5\cs{linewidth}} either the wrapped text has
+% problems with inter word spaces and hyphenation because of the small
+% measure, or, on the opposite, the indented lines of the wrapping text
+% have similar problems.
 %
 %^^A%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % \section{Environment syntax}
@@ -312,7 +314,7 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 %\section{Examples}
 %^^A%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % We display some examples by using fake objects such that suitably
-% long paragraphs are available; some fake language long paragraphs are
+% long paragraphs are available; some fake-language long-paragraphs are
 % obtained by means of the \pack{kantlipsum} package functionalities.
 % They contain paragraphs that look as Kant's sentences, but we
 % doubt that Immanuel Kant ever wrote such texts\dots
@@ -322,7 +324,7 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 %^^A%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 %
-%\begin{wrapfigure}{r}{50mm}*
+%\begin{wrapfigure}{r}{50mm}
 %\centering\unitlength=1mm
 %\begin{picture}(40,30)
 %\polygon(0,0)(40,0)(40,30)(0,30)
@@ -362,11 +364,11 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 % case a \cs{centering} command might help to center the table
 % within the indention of the wrapping text. Nevertheless the
 % software can compute the object width if a zero value is specified
-% or if the mandatory \meta{width} parameter is completely omitted;
-% this second possibility is a feature of this package, that uses a
-% \LaTeXiii property by which even a braced argument can be treated
-% as an optional argument with a predefined default value; see below
-% more details about this feature.
+% or if the \meta{width} parameter is completely omitted together
+% with its braces; this second possibility is a feature of this
+% package, that uses a \LaTeXiii property by which even a braced
+% argument can be treated as an optional argument with a predefined
+% default value; see below more details about this feature.
 %
 %\begin{wraptable}{l}
 %\centering 
@@ -404,9 +406,9 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 % this width parameter might yield better looking results.
 % 
 % On the opposite if the user estimates that the table with its
-% caption might use 5 lines, and specified such a value as the
+% caption might use 5~lines, and specified such a value as the
 % first (optional) argument to the environment, the result would
-% be this poor one, with the last caption line overlapping the
+% be the following poor one, with the last caption line overlapping the
 % wrapping text.
 %
 %\begin{wraptable}[5]{l}
@@ -421,8 +423,6 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 %\end{wraptable}
 %\kant[2]
 %
-% If 
-%
 %^^A%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % \subsection{A wrapped text}
 %^^A%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -524,7 +524,7 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 % and its default value amounts to half the current measure; it can
 % be specified but it should not be too different from 50\% the
 % current measure. For the standard environments this parameter value
-% is mandatory, but, we recall, for the redefined environments
+% is mandatory, but, we recall, only for the redefined environments
 % \env{wrapfigure} and \env{wraptable}, this braced argument is optional.
 %
 %^^A%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -532,20 +532,19 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 %^^A%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Pictures and textual arrays may be floated by means of the standard
 % \amb{figure} and \amb{table} environments. But other floating
-% objects may be defined by means of the \pack{float} package,
-% just to name one, or classes. Besides floating, the main difference
-% is the name of the caption “label”: Figure, Table, Algorithm,
-% Example, and so on.
+% objects may be defined by means of other packages, for example the
+% \pack{float}, or classes, such as \class{memoir}. Besides floating,
+% the main difference is the name of the caption “label”: Figure, Table,
+% Algorithm, Example, and so on.
 %
 % If floating is not necessary, this package (as well as the original
 % one) allows to use the underlying  environment \Env{wrapfloat}
 % that uses the same syntax as \Env{wrapfigure} plus the mandatory
 % name of the new object: even a figure  might be introduced without
 % using \amb{wrapfigure}, by using instead:
-%\begin{flushleft}\ttfamily\obeylines
-%\Benv{wrapfloat}\Marg{figure}\oarg{line number}\marg{placement}\%
-%\quad \oarg{overhang}\marg{width}\meta{$\star$}
-%\qquad\qquad\meta{image}
+%\begin{flushleft}\setfontsize{9.275}\ttfamily\obeylines
+%\Benv{wrapfloat}\Marg{figure}\oarg{line number}\marg{placement}\oarg{overhang}\marg{width}\meta{$\star$}
+%\quad\qquad\meta{image}
 %\Eenv{wrapfloat}
 %\end{flushleft}
 % Another \meta{object} may be wrapped by using:
@@ -588,7 +587,7 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 %\begin{quote}
 % Most, but not all, of the argument types defined by \pack{xparse}
 % are now supported at the kernel level. In particular, the types
-% \texttt{g/G}, \texttt{l} and \texttt{u} are not provided by the
+% \texttt{g/G}, \texttt{l} and \texttt{u}, are not provided by the
 % kernel code; these are \emph{deprecated} but still available by
 % explicitly loading \pack{xparse}. All other argument types are
 % now available directly within the \LaTeXe kernel.
@@ -649,10 +648,10 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 % and \pack{xfp} packages before loading \pack{wrapfig2}.
 % Notice that most of the \pack{xparse} package functionalities
 % at the date required for the format file are already included. The
-% \pack{xparse} package has been available about in 2018; should the user
-% have available a definitely  older \TeX system installation, s/he
+% \pack{xparse} package has been available about in 2018; should the users
+% have available a definitely  older \TeX system installation, they
 % should upgrade it, or must avoid using this \pack{wrapfig2} package
-% and use the original one; if s/he needs to wrap text, s/he should
+% and use the original one; if they need to wrap text, they should
 % resort to some ingenious tricks to do it.
 %
 % The opening command of the \Env{wrapfloat} environment receives
@@ -696,10 +695,10 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 % to be wrapped, that does not have a specific width; moreover the
 % inserted text must not be too wide, nor too short in order to avoid
 % problems for its justification or the justification of the wrapping
-% text. The framed box width is preset to 50\% of the normal text measure,
-% but it can be optionally specified to a different value (not too
-% different from 50\%), while for the other environments the wrapped
-% material width is an \emph{optional braced parameter}.
+% lines. The framed box width is preset to 50\% of the normal text
+% measure, but it can be optionally specified to a different value (not
+% too different from 50\%), while for the other environments the wrapped
+% material width is an \emph{braced optional parameter}.
 %
 % For what concerns the \Env{wraptext} environment, see below,
 % because the code is a little more complicated and requires some
@@ -709,23 +708,26 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 % because the computation of the insertion block height is pretty
 % precise and at most the user might desire one line more or less
 % depending on the  measure of the whole text, and that of the
-% inserted block and/or the measure of the indented wrapped lines.
+% inserted block and/or the measure of the indented wrapped lines;
+% sometimes it might be necessary to get rid of the space below the
+% inserted block when it gets typeset at the bottom of a page.
 %
 % It is true that some of the input parameters specified to the opening
-% command with \LaTeXiii are available also to the closing commands; see
-% the last paragraph of section~2 in the \pack{xparse} documentation. 
+% command of any environment with \LaTeXiii are available also to the
+% closing commands; see the last paragraph of section~2 in the
+% \pack{xparse} documentation. 
 % But the following definition, besides using special delimiters for
 % optional parameters,  uses the separate opening and closing
 % macros  of the \Env{wrapfloat} environment; such procedure
 % apparently breaks this second availability of the input parameters,
 % therefore it is necessary to save them into local macros or count
-% registers (assignments of \TeX count registers are \emph{local},
-% while assignment of the \LaTeX\ named counters, through the
+% registers (assignments to \TeX count registers are \emph{local},
+% while assignment to \LaTeX\ named counters, through the
 % \cs{setcounter} macro and its siblings, are \emph{global}) so 
 % that we can use their values within the closing commands.
 %
-% The \cs{NWF@box} has been assigned at the beginning; remember
-% that \LaTeXiii registers of any kind are not limited in number
+% The \cs{NWF@box} box register has been assigned at the beginning;
+% remember that \LaTeXiii registers of any kind are not limited in number
 % as they were some years ago even with \LaTeXe. 
 % The last opening commands are conceived to box the object to be
 % wrapped, typeset within a \Env{minipage} with the default or
@@ -785,7 +787,7 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 % arguments.
 %
 % The main function of this environment is to handle the box that
-% contains the figure, or the table, or the framed test, or what
+% contains the figure, or the table, or the framed text, or what
 % else, so that the inserted box is preceded and followed by the
 % suitable vertical spaces, and it is possible to compute the
 % number of lines to be indented; often this computed number is correct;
@@ -793,7 +795,7 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 % within prohibited wrapping text, such number might need to be
 % corrected. As it can be seen the optional star is not among
 % the argument descriptors of the opening commands; it will be
-% the following macro \cs{WR@wr} to take care of examining
+% the following macro \cs{WR@wr} responsible of taking care of
 % the list of arguments and see if a star has been specified and
 % not yet read by the preceding commands.
 %
@@ -855,7 +857,7 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 % After these adjustments, it computes the box total height plus some
 % fixed amounts needed mostly to set the wrapped material below the
 % first wrapping text first line. Here is where the \LaTeXiii
-% \cs{fpeval} computing macro comes into play so as to assign such
+% \cs{fpeval} computing function comes into play so as to assign such
 % height to \cs{WF@size}. Some unusual macros are executed; they
 % were devised by Arseneau to deal with possibly floating wrapped
 % objects. The optional star is not accepted by this macro; if the user
@@ -864,11 +866,11 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 % the user specifies it for this environment, an asterisk appears
 % at the beginning of the wrapped text.
 %
-% The mandatory \texttt{\#4} \meta{width} parameter (actually a
-% \meta{optional braced parameter}) may be specified
+% The braced \texttt{\#4} \meta{width} parameter (actually a
+% \meta{braced optional parameter}) may be specified
 % to be \texttt{0pt}; in any case \texttt{0pt} is the default parameter
 % value; if so, the object is treated at its natural width, by
-% boxing it into an hbox and using this hbox width as the working width
+% boxing it into an hbox and using this box width as the working width
 %    \begin{macrocode}
 \NewDocumentCommand\WF@wr{o m o m s}{%
   \xdef\WF@wfname{wrap\@captype\space}%
@@ -1030,7 +1032,7 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
    \fi
    \xdef\WF@place{\the\lccode\lccode\WF@place}%
                  }%                               twice to get only l or r
-  \hbox to\z@{%       llap o rlap depending on lor r; calc effective width
+  \hbox to\z@{%      llap o rlap depending on l or r; calc effective width
     \@tempdima\wd\WF@box \@tempdimb\WF@ovh
     \advance\@tempdima-\@tempdimb \advance\@tempdima\columnsep
     \@tempdimb\hsize \advance\@tempdimb-\@tempdima
@@ -1062,7 +1064,6 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
   \aftergroup\WF@startwrapping  
 \fi
 }
-
 %    \end{macrocode}
 %
 % Here comes the very important macro that counts the wrapping indented
@@ -1074,14 +1075,13 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 % fact that this macro cannot preview actions that have not
 % yet taken place when this macro is executed.
 %
-% This macro is the one that counts the lines to be indented by
-% rounding the division of the box height by the current base
-% line skip. Notice that \texttt{WF@wrappedlines} is the name
-% of a \LaTeX named counter, not of a \TeX numeric register;
-% therefore special LaTeX commands, such as \cs{setocounter} or
-% \cs{value}, have to be used in order to  set or access the
-% numerical value stored within the \TeX register associated
-% to the \LaTeX counter name.
+% This macro counts the lines to be indented by rounding the division
+% of the box height by the current base line skip. Notice that
+% \texttt{WF@wrappedlines} is the name of a \LaTeX named counter,
+% not of a \TeX numeric register; therefore special LaTeX commands,
+% such as \cs{setocounter} or \cs{value}, have to be used in order
+% to  set or access the numerical value stored within the \TeX
+% register associated to the \LaTeX counter name.
 %    \begin{macrocode}
 \def\WF@startwrapping{%
   \ifnum\WF@wli=\z@ %                              no number was specified
@@ -1309,7 +1309,7 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 %
 % Here there is some Arseneau's code that renders his \pack{wrapfig}
 % code compatible with \cs{newfloat} of class \class{memoir}, and
-% with \cs{newfoatlist} of package \pack{ccaption}. We leave his code
+% with \cs{newfloatlist} of package \pack{ccaption}. We leave his code
 % hereafter; but we did not test it with this package.
 % \begin{macrocode}
 \let\WF@floatstyhook\relax
@@ -1370,13 +1370,13 @@ X\ifdim\fontdimen1\font=0pt\kern-0.15em\fi
 
 %    \end{macrocode}
 % We never described the package options; this code was present
-% in Arseneau's code and ve leave it here, with the necessary
-% package name change. We think that this \opz{verbose} option
+% in Arseneau's code and we leave it here, with the necessary
+% package-name changes. We think that this \opz{verbose} option
 % was and remains useless, since the instances of command
 % \cs{WF@info} were mostly commented out in the original code;
 % in any case, input of this code is stopped if the
 % \cs{DeclareOption} command is not defined; this command was
-% defined with \LaTeXe; therefore this is a residual of the old
+% defined with \LaTeXe; therefore might be a residual of the old
 % times when \LaTeXccix was still in use, more than 25 years
 % ago\dots
 %    \begin{macrocode}
diff --git a/macros/latex/contrib/wrapfig2/wrapfig2.pdf b/macros/latex/contrib/wrapfig2/wrapfig2.pdf
index 5e60317074..1b17f61e8e 100644
--- a/macros/latex/contrib/wrapfig2/wrapfig2.pdf
+++ b/macros/latex/contrib/wrapfig2/wrapfig2.pdf
diff --git a/macros/latex/contrib/yb-book/DEPENDS.txt b/macros/latex/contrib/yb-book/DEPENDS.txt
new file mode 100644
index 0000000000..df34424b3d
--- /dev/null
+++ b/macros/latex/contrib/yb-book/DEPENDS.txt
@@ -0,0 +1,33 @@
+hard xkeyval
+hard geometry
+hard fontenc
+hard inputenc
+hard anyfontsize
+hard tikz
+hard chngcntr
+hard lastpage
+hard paralist
+hard xcolor
+hard graphicx
+hard setspace
+hard textcomp
+hard enumitem
+hard float
+hard ulem
+hard qrcode
+hard wrapfig
+hard xfp
+hard soul} % in order to use \st{
+hard xifthen
+hard csquotes
+hard biblatex
+hard imakeidx
+hard microtype
+hard libertine
+hard footmisc
+hard titlesec
+hard titlesec
+hard fancyhdr
+hard wrapfig
+hard mdframed
+hard changepage
diff --git a/macros/latex/contrib/yb-book/README.md b/macros/latex/contrib/yb-book/README.md
new file mode 100644
index 0000000000..a9eae33589
--- /dev/null
+++ b/macros/latex/contrib/yb-book/README.md
@@ -0,0 +1,25 @@
+[![make](https://github.com/yegor256/yb-book/actions/workflows/make.yml/badge.svg)](https://github.com/yegor256/yb-book/actions/workflows/make.yml)
+[![License](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/yegor256/yb-book/blob/master/LICENSE.txt)
+
+This LaTeX class I use to format [my books](https://www.yegor256.com/books.html), 
+which I sell [on Amazon](https://www.amazon.com/Yegor-Bugayenko/e/B01AM1QMDK).
+
+First, [install it](https://en.wikibooks.org/wiki/LaTeX/Installing_Extra_Packages)
+from [CTAN](https://ctan.org/pkg/yb-book) 
+and then use in the preamble:
+
+```tex
+\documentclass{yb-book}
+\renewcommand*\theauthor{Jeff Lebowski}
+\renewcommand*\thevolume{1}
+\renewcommand*\thetitle{New Book About OOP}
+\begin{document}
+Hello, world!
+\end{document}
+```
+
+If you want to contribute yourself, make a fork, then create a branch, 
+then run `make` in the root directory.
+It should compile everything without errors. If not, submit an issue and wait.
+Otherwise, make your changes and then run `make` again. If the build is
+still clean, submit a pull request.
diff --git a/macros/latex/contrib/yb-book/samples/sample.tex b/macros/latex/contrib/yb-book/samples/sample.tex
new file mode 100644
index 0000000000..b5528d54ca
--- /dev/null
+++ b/macros/latex/contrib/yb-book/samples/sample.tex
@@ -0,0 +1,41 @@
+% (The MIT License)
+%
+% Copyright (c) 2021 Yegor Bugayenko
+%
+% Permission is hereby granted, free of charge, to any person obtaining a copy
+% of this software and associated documentation files (the 'Software'), to deal
+% in the Software without restriction, including without limitation the rights
+% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+% copies of the Software, and to permit persons to whom the Software is
+% furnished to do so, subject to the following conditions:
+%
+% The above copyright notice and this permission notice shall be included in all
+% copies or substantial portions of the Software.
+%
+% THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+% SOFTWARE.
+
+\documentclass{../yb-book}
+\renewcommand*\thetitle{\LaTeX{} Class yb-book}
+\renewcommand*\theauthor{Yegor Bugayenko}
+\begin{document}
+
+\ybPrintTitlePage
+
+\newpage
+
+\chapter{Overview}
+
+\section{Purpose}
+
+\index{computer}
+This is a very interesting book about computers.
+
+\ybPrintIndex
+
+\end{document}
\ No newline at end of file
diff --git a/macros/latex/contrib/yb-book/yb-book-logo.pdf b/macros/latex/contrib/yb-book/yb-book-logo.pdf
new file mode 100644
index 0000000000..5d49cb9daa
--- /dev/null
+++ b/macros/latex/contrib/yb-book/yb-book-logo.pdf
diff --git a/macros/latex/contrib/yb-book/yb-book.cls b/macros/latex/contrib/yb-book/yb-book.cls
new file mode 100644
index 0000000000..4b99e80514
--- /dev/null
+++ b/macros/latex/contrib/yb-book/yb-book.cls
@@ -0,0 +1,341 @@
+% (The MIT License)
+%
+% Copyright (c) 2021-2022 Yegor Bugayenko
+%
+% Permission is hereby granted, free of charge, to any person obtaining a copy
+% of this software and associated documentation files (the 'Software'), to deal
+% in the Software without restriction, including without limitation the rights
+% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+% copies of the Software, and to permit persons to whom the Software is
+% furnished to do so, subject to the following conditions:
+%
+% The above copyright notice and this permission notice shall be included in all
+% copies or substantial portions of the Software.
+%
+% THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+% SOFTWARE.
+
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesClass{yb-book}[2022/01/03 0.1.0 YB Branded Book Style]
+
+\RequirePackage{xkeyval}
+
+\makeatletter
+\newif\ifyb@draft
+\DeclareOptionX{draft}{\yb@drafttrue}
+\newif\ifyb@compact
+\DeclareOptionX{compact}{\yb@compacttrue}
+\newif\ifyb@manuscript
+\DeclareOptionX{manuscript}{\yb@manuscripttrue}
+\ProcessOptionsX
+\makeatother
+
+\makeatletter\ifyb@draft
+  \PassOptionsToClass{11pt}{book}
+  \PassOptionsToClass{oneside}{book}
+\else
+  \ifyb@manuscript
+    \PassOptionsToClass{12pt}{book}
+    \PassOptionsToClass{oneside}{book}
+  \else
+    \PassOptionsToClass{11pt}{book}
+    \PassOptionsToClass{twoside}{book}
+  \fi
+\fi\makeatother
+
+\LoadClass{book}
+
+\RequirePackage{geometry}
+  \geometry{paperwidth=6in, paperheight=9in, bindingoffset=0.25in, left=0.75in, right=0.75in, top=0.75in, bottom=1.25in}
+  \makeatletter\ifyb@draft
+    \geometry{a4paper, margin=1in, left=1.5in}
+  \else
+    \ifyb@manuscript
+      \geometry{a4paper, margin=1.2in}
+    \fi
+  \fi\makeatother
+
+\RequirePackage[T1]{fontenc}
+\RequirePackage[utf8]{inputenc}
+\RequirePackage{anyfontsize}
+\RequirePackage{tikz}
+  \usetikzlibrary{positioning}
+  \usetikzlibrary{shapes}
+  \usetikzlibrary{fit}
+\RequirePackage{chngcntr}
+  \counterwithout{footnote}{chapter}
+\RequirePackage{lastpage}
+\RequirePackage{paralist}
+\RequirePackage{xcolor}
+\RequirePackage{graphicx}
+\RequirePackage{setspace}
+  \setstretch{1.2}
+  \makeatletter\ifyb@draft\setstretch{1.1}\fi\makeatother
+  \makeatletter\ifyb@compact\setstretch{1.0}\fi\makeatother
+  \makeatletter\ifyb@manuscript\setstretch{1.1}\fi\makeatother
+\RequirePackage{textcomp}
+\RequirePackage[inline]{enumitem}
+  \setlist{nosep}
+\RequirePackage{float}
+\RequirePackage[normalem]{ulem}
+\RequirePackage{qrcode}
+\RequirePackage{wrapfig}
+  \pagestyle{plain}
+\RequirePackage{xfp}
+\RequirePackage{soul} % in order to use \st{} to strikethrough
+\RequirePackage{xifthen}
+\RequirePackage[autostyle=try]{csquotes}
+
+\RequirePackage[indexing=cite,style=authoryear,natbib=true,maxnames=1,minnames=1,doi=false,url=false,isbn=false,isbn=false]{biblatex}
+  \DeclareCiteCommand{\citetitle}
+    {\boolfalse{citetracker}%
+     \boolfalse{pagetracker}%
+     \usebibmacro{prenote}}
+    {\ifciteindex
+       {\indexnames{labelname}}
+       {}%
+     \printfield[citetitle]{labeltitle}}
+    {\multicitedelim}
+    {\usebibmacro{postnote}}
+  \DeclareCiteCommand*{\citetitle}
+    {\boolfalse{citetracker}%
+     \boolfalse{pagetracker}%
+     \usebibmacro{prenote}}
+    {\ifciteindex
+       {\indexnames{labelname}}
+       {}%
+     \printfield[citetitle]{title}}
+    {\multicitedelim}
+    {\usebibmacro{postnote}}
+\RequirePackage{imakeidx}
+  \renewbibmacro*{citeindex}{\indexnames{labelname}{}}
+  \makeindex
+  \indexsetup{othercode={\hyphenpenalty=10000}}
+
+\newenvironment{condensed}{%
+  \begingroup\setstretch{1.0}%
+  % This lsstyle is defined by 'letterspace' in microtype
+  \lsstyle}{\endgroup}
+
+\makeatletter\ifyb@draft\else
+  \RequirePackage[letterspace=-50]{microtype}
+\fi\makeatother
+
+\makeatletter\ifyb@manuscript
+  \RequirePackage[tt=false,type1=true]{libertine}
+\fi\makeatother
+
+\RequirePackage[bottom,perpage,multiple]{footmisc}
+  % see https://tex.stackexchange.com/questions/40072/incompatibility-between-footmisc-option-multiple-and-hyperref/62091#62091
+  \makeatletter\let\yb@oldfootnote\footnote\makeatother
+  \makeatletter\newcommand\yb@nexttoken\relax\makeatother
+  \makeatletter\newcommand\yb@isfootnote{%
+    \ifx\footnote\yb@nexttoken\textsuperscript{,}\fi}\makeatother
+  \makeatletter\renewcommand\footnote[1]{%
+    \yb@oldfootnote{#1}\futurelet\yb@nexttoken\yb@isfootnote}\makeatother
+
+\makeatletter
+  \let\yb@oldsection\section
+  \ifyb@draft
+    \RequirePackage[medium]{titlesec}
+  \else
+    \RequirePackage[raggedright]{titlesec}
+      \titlespacing{\section}{0in}{6pt}{6pt}[1in]
+    \renewcommand\section{\newpage\yb@oldsection}
+  \fi
+\makeatother
+
+\makeatletter\ifyb@compact
+  \renewcommand\section{\vspace{2em}\yb@oldsection}
+\fi\makeatother
+
+\makeatletter\ifyb@draft
+  \RequirePackage{fancyhdr}
+    \pagestyle{fancy}
+    \renewcommand\headrulewidth{0pt}
+    \renewcommand\footrulewidth{0pt}
+    \fancyhf{}
+    \fancyhead[L,C,LO,CO]{}
+    \fancyhead[R,RO]{
+      \begin{textblock}{4}(11.5,1)
+        \begin{tikzpicture}
+          \node [color=gray, rotate=270, font=\ttfamily\scriptsize, text width=5in] at (0,0) {
+            Copyright \textcopyright{} \the\year{} by \theauthor{}.
+            All rights reserved. No part of the contents of this book may be
+            reproduced or transmitted in any form or by any means without the
+            written permission of the publisher.
+            This particular manuscript is printed for
+            \textbf{\thereviewer{}} and may be used only for one-time review. The
+            manuscript has to be destroyed after the review.
+          };
+        \end{tikzpicture}
+      \end{textblock}
+    }
+    \fancyfoot[C,CO]{\small\ttfamily page \#\thepage{} of \pageref{LastPage}}
+\fi\makeatother
+
+\renewcommand\maketitle{
+  {\LARGE\textbf{\thetitle}}
+  \\[1em]
+  by \theauthor{}
+  \\[4em]
+  \ifx\thevolume\empty\else%
+    Volume \thevolume{}\\
+  \fi
+  \ifx\thedate\empty\else%
+    Rendered on \thedate{}
+  \fi
+  \ifx\theversion\empty\else%
+    \\
+    Ver. \theversion{}
+  \fi
+}
+
+\makeatletter\newcommand\ybPrintTitlePage{
+  \ifyb@draft\else
+    \begin{titlepage}
+      \ttfamily
+      \vspace*{\fill}
+      \noindent
+      {\Huge\textbf{\thetitle}}
+      \\[1em]
+      by \theauthor{}
+      \\[4em]
+      \ifx\thevolume\empty\else%
+        Volume \thevolume{}\\
+      \fi
+      \ifx\thedate\empty\else%
+        \thedate{}
+      \fi
+      \ifx\thedate\empty\else%
+        \\
+        \theversion{}
+      \fi
+      \vspace*{\fill}
+    \end{titlepage}
+  \fi
+}\makeatother
+
+\makeatletter\newcommand\ybPrintTOC{
+  \ifyb@draft\else
+    \ifyb@compact\else\cleardoublepage\fi
+    {\setstretch{0.7}\tableofcontents}
+  \fi
+}\makeatother
+
+\makeatletter\newcommand\ybPrintIndex[1][Index]{
+  \ifyb@draft\else
+    \cleardoublepage
+    {
+      \setstretch{1.0}
+      \small
+      \addcontentsline{toc}{chapter}{#1}
+      \printindex
+    }
+  \fi
+}\makeatother
+
+\newcommand\ybPrintIcons{%
+  \ifdefempty{\theemail{}}{}{%
+    \includegraphics[height=1em]{images/icon-email.pdf}%
+    \theemail{}%
+  }%
+  \includegraphics[height=1em]{images/icon-twitter.pdf}%
+  \includegraphics[height=1em]{images/icon-linkedin.pdf}%
+  \includegraphics[height=1em]{images/icon-github.pdf}%
+  \includegraphics[height=1em]{images/icon-instagram.pdf}%
+  \includegraphics[height=1em]{images/icon-facebook.pdf}%
+  \thesocial{}%
+}
+
+% quotes
+\RequirePackage{wrapfig}
+\RequirePackage{mdframed}
+\RequirePackage{changepage}
+  \strictpagecheck
+\mdfdefinestyle{quoteodd}{backgroundcolor=black!0,
+  leftmargin=6pt,rightmargin=0pt,
+  innerleftmargin=6pt,innerrightmargin=0pt,
+  innertopmargin=0pt,innerbottommargin=0pt,
+  skipabove=0pt,skipbelow=0pt,
+  linewidth=2pt,
+  topline=false,bottomline=false,rightline=false}
+\mdfdefinestyle{quoteeven}{backgroundcolor=black!0,
+  rightmargin=6pt,leftmargin=0pt,
+  innerrightmargin=6pt,innerleftmargin=0pt,
+  innertopmargin=0pt,innerbottommargin=0pt,
+  skipabove=0pt,skipbelow=0pt,
+  linewidth=2pt,
+  topline=false,bottomline=false,leftline=false}
+\makeatletter\newcommand\ybQuote[3]{%
+  \ifthenelse{\isempty{#3}}{}{
+    \ifx\hfuzz#2\hfuzz%
+      \index{#3}%
+    \else%
+      \index{#3, #2}%
+    \fi%
+  }%
+  \def\yb@body{%
+    \raggedright%
+    \ifx\hfuzz#3\hfuzz%
+      #1%
+    \else%
+      ``#1''\\\raggedleft---#2 #3%
+    \fi%
+  }
+  \ifyb@draft%
+    \begin{wrapfigure}{r}{0.4\textwidth}%
+      \begin{mdframed}[style=quoteodd]%
+        \yb@body%
+      \end{mdframed}%
+    \end{wrapfigure}%
+  \else%
+    \begin{wrapfigure}{o}[12pt]{0.4\textwidth}%
+      \sffamily\checkoddpage%
+      \ifoddpage%
+        \begin{mdframed}[style=quoteodd]\yb@body\end{mdframed}%
+      \else%
+        \begin{mdframed}[style=quoteeven]\yb@body\end{mdframed}%
+      \fi%
+      \vspace{-12pt}
+    \end{wrapfigure}%
+  \fi%
+}\makeatother
+
+\makeatletter\newcommand\ybPrintBibliography{%
+  \AtNextBibliography{\small}%
+  \raggedright%
+  \ifyb@manuscript%
+    \setlength\bibitemsep{0pt}%
+    \newpage%
+    \begin{multicols}{2}{\setstretch{1.0}\printbibliography}\end{multicols}
+  \else
+    \printbibliography
+  \fi
+}\makeatother
+
+\AtBeginDocument{%
+  \raggedbottom%
+  \setlength\topskip{0mm}%
+  \setlength\parindent{0pt}%
+  \setlength\parskip{6pt}%
+  \interfootnotelinepenalty=10000%
+}
+
+\newcommand*\thetitle{\textbackslash{}thetitle}
+\newcommand*\thevolume{}
+\newcommand*\thedate{}
+\newcommand*\theemail{\textbackslash{}theemail}
+\newcommand*\thesocial{\textbackslash{}thesocial}
+\newcommand*\theversion{\textbackslash{}theversion}
+\newcommand*\theauthor{\textbackslash{}theauthor}
+\newcommand*\thereviewer{\textbackslash{}thereviewer}
+\newcommand*\theyear{\textbackslash{}theyear}
+\newcommand*\theprice{\textbackslash{}theprice}
+
+\endinput
diff --git a/macros/latex/contrib/yb-book/yb-book.pdf b/macros/latex/contrib/yb-book/yb-book.pdf
new file mode 100644
index 0000000000..cde5f931f5
--- /dev/null
+++ b/macros/latex/contrib/yb-book/yb-book.pdf
diff --git a/macros/latex/contrib/yb-book/yb-book.tex b/macros/latex/contrib/yb-book/yb-book.tex
new file mode 100644
index 0000000000..0937552058
--- /dev/null
+++ b/macros/latex/contrib/yb-book/yb-book.tex
@@ -0,0 +1,79 @@
+% (The MIT License)
+%
+% Copyright (c) 2021-2022 Yegor Bugayenko
+%
+% Permission is hereby granted, free of charge, to any person obtaining a copy
+% of this software and associated documentation files (the 'Software'), to deal
+% in the Software without restriction, including without limitation the rights
+% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+% copies of the Software, and to permit persons to whom the Software is
+% furnished to do so, subject to the following conditions:
+%
+% The above copyright notice and this permission notice shall be included in all
+% copies or substantial portions of the Software.
+%
+% THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+% SOFTWARE.
+
+\documentclass[compact,manuscript]{./yb-book}
+\usepackage{ffcode}
+\usepackage{href-ul}
+\renewcommand*\theversion{0.1.0}
+\renewcommand*\thedate{2022/01/03}
+\renewcommand*\thetitle{\LaTeX{} Class \ff{yb-book}}
+\renewcommand*\theauthor{Yegor Bugayenko}
+
+\begin{document}
+
+\includegraphics[height=6em]{yb-book-logo.pdf}
+\vspace*{24pt}
+
+\maketitle
+
+\index{Amazon}
+The provided class \ff{yb-book} helps me design
+\href{https://www.yegor256.com/books.html}{my books} and
+publish them
+\href{https://www.amazon.com/Yegor-Bugayenko/e/B01AM1QMDK}{on Amazon}.
+
+There are a few class options you can use:
+
+\ff{compact} --- when you need to make text more compact
+and take less vertical space;
+
+\ff{manuscript} --- when the format is not for Amazon printing,
+but for some other purposes (the page size is A4), like the document
+you are reading right now;
+
+\ff{draft} --- when it's a draft for reviewers (the page size is A4)
+and you want to have a watermark and a compact form of the content;
+
+\section*{Printers}
+
+There are a number of printers, commands that print large blocks of text
+in the expected format:
+
+\ff{\textbackslash{}ybPrintTitlePage} --- prints the first page of a book.
+
+\ff{\textbackslash{}ybPrintTOC} --- prints the table of contents.
+
+\ff{\textbackslash{}ybQuote} --- prints a side quote.
+
+\ff{\textbackslash{}ybPrintBibliography} --- prints the list of bib references.
+
+\ff{\textbackslash{}ybPrintIcons} --- prints your social icons.
+
+\ff{\textbackslash{}ybPrintIndex[1]} --- prints index with an optional name of the section (instead of ``Index'').
+
+For more samples, check the directory \ff{samples/}.
+
+You are welcome to suggest additional commands, but the style
+of my books is intentionally as simple as possible, avoiding formatting
+as much as possible.
+
+\end{document}
\ No newline at end of file