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\ProvidesPackage{overlays}[2021/02/23 v2.12 Incremental slides]
% Copyright (C) 2021 Andreas Nolda
% Author: Andreas Nolda <andreas@nolda.org>
% Version: 2.12
% This work may be distributed and/or modified under the conditions of the LaTeX
% Project Public License, either version 1.3c of this license or (at your
% option) any later version. The latest version of this license is in
% http://www.latex-project.org/lppl.txt and version 1.3c or later is part of all
% distributions of LaTeX version 2005/12/01 or later.
% The following code is inspired by Matthias Meister's "present" package. It
% uses an algorithm by Martin Scharrer for testing numbers in numerical ranges
% (http://tex.stackexchange.com/q/19000). The code for saving counters between
% overlays as well as for overlays with verbatim content is taken from the
% "texpower" package, which in turn is based on Till Tantau's "beamer" package.
\RequirePackage{xcolor}
\RequirePackage{environ}
\RequirePackage{pgffor}
\def\s@vedcounters{}
\def\s@vedseries{}
\def\s@vecounters
{\begingroup
\def\@elt##1{\global\csname c@##1\endcsname\the\csname c@##1\endcsname}%
\xdef\restores@vedcounters{\s@vedcounters}%
\endgroup}
\def\s@veseries
{\begingroup
\def\@elt##1{\def\expandafter\noexpand\csname enit@resume@series@##1\endcsname%
{\csname c@##1i\endcsname\csname the##1i\endcsname}}%
\xdef\restores@vedseries{\s@vedseries}%
\endgroup}
\newcommand{\savecounterbetweenoverlays}[1]%
{\expandafter\def\expandafter\s@vedcounters\expandafter{\s@vedcounters\@elt{#1}}}
\let\savebetweenoverlays\savecounterbetweenoverlays % for backward compatibility
\newcommand{\saveseriesbetweenoverlays}[1]%
{\expandafter\def\expandafter\s@vedseries\expandafter{\s@vedseries\@elt{#1}}}
\savebetweenoverlays{page}
\savebetweenoverlays{equation}
\newcount\curoverl@y
\newcount\maxoverl@y
\NewEnviron{overlays}[1]%
{\s@vecounters
\s@veseries
\maxoverl@y=#1%
\curoverl@y=0%
\loop
\advance\curoverl@y by 1%
\begingroup
\BODY
\endgroup
\ifnum\curoverl@y<\maxoverl@y%
\clearpage
\restores@vedcounters
\restores@vedseries
\repeat}
\newwrite\verb@timfileout
\def\verb@timreadslide
{\begingroup%
\let\do\@makeother\dospecials%
\count@=127%
\@whilenum\count@<255 \do
{\advance\count@ by 1%
\catcode\count@=11}
\@makeother\^^L
\endlinechar`\^^M \catcode`\^^M=12 \processslidefirstline}
\newenvironment{fragileoverlays}[1]
{\maxoverl@y=#1%
\def\verb@timfilen@me{\jobname.vrb}%
\immediate\openout\verb@timfileout=\verb@timfilen@me%
\verb@timreadslide}
{\immediate\closeout\verb@timfileout%
\begin{overlays}{\maxoverl@y}
\def\verbatim@nolig@list{\do\`\do\<\do\>\do\'} % don't make "," and "-" active
\input{\verb@timfilen@me}%
\end{overlays}}
\def\endfr@gileoverl@ys{\endgroup\end{fragileoverlays}}
{\catcode`\^^M=12\endlinechar=-1%
\long\gdef\processslidefirstline#1^^M%
{\def\overl@ystest{#1}%
\ifx\overl@ystest\stopslidefirst%
\let\next=\endfr@gileoverl@ys%
\else
\ifx\overl@ystest\@empty%
\else%
\@temptokena={#1}%
\immediate\write\verb@timfileout{\the\@temptokena}%
\fi%
\let\next=\processslideline%
\fi%
\next}
\long\gdef\processslideline#1^^M%
{\def\overl@ystest{#1}%
\ifx\overl@ystest\stopslide%
\let\next=\endfr@gileoverl@ys%
\else
\immediate\write\verb@timfileout{#1}%
\fi%
\next}}
{\escapechar=-1\relax%
\xdef\stopslide{\string\\end\string\{fragileoverlays\string\}}
\xdef\stopslidefirst{\noexpand\end\string\{fragileoverlays\string\}}}
\newcount\overl@yspeca
\newcount\overl@yspecb
\def\@getoverl@yspecb-#1\relax%
{\ifx\relax#1\relax
\overl@yspecb=\maxoverl@y
\else
\overl@yspecb=#1\relax
\fi}
\def\getoverl@yspecb%
{\@ifnextchar\relax
{\overl@yspecb=\overl@yspeca}%
{\@getoverl@yspecb}}
\def\ifinoverl@yspec#1#2%
{\global\let\inoverl@yspec\@secondoftwo
\foreach \i in {#2}
{\afterassignment\getoverl@yspecb
\overl@yspeca=0\i\relax
\pgfmathtruncatemacro\result{and((#1>=\overl@yspeca),(#1<=\overl@yspecb))}%
\ifnum\result=1\relax
\breakforeach
\global\let\inoverl@yspec\@firstoftwo
\fi}%
\inoverl@yspec}
\long\def\overl@y#1#2#3{\ifinoverl@yspec{\curoverl@y}{#1}{#2}{#3}}
\newcommand{\only}[2]{\overl@y{#1}{#2}{\setbox1=\vbox{#2}}} % ensure side-effects of content (such as incremented counters)
\definecolor{background}{rgb}{1,1,1}
\@ifpackageloaded{pstricks}%
{\def\pssetb@ckgroundcolor{\psset{linecolor=background}}}%
{\def\pssetb@ckgroundcolor{\relax}}
\@ifpackageloaded{graphics}%
{\def\hidegr@phics{\Gin@drafttrue}}%
{\def\hidegr@phics{\relax}}
\newcommand{\visible}[2]{\overl@y{#1}{#2}{{\color{background}%
\blendcolors{!0!background}%
\pssetb@ckgroundcolor
\hidegr@phics
{#2}%
\ifvmode
\unskip % undo spurious space introduced by \color
\fi}}}
\newcommand{\psvisible}[2]{\overl@y{#1}{#2}{{\pssetb@ckgroundcolor
{#2}}}}
\definecolor{alert}{rgb}{1,0,0}
\@ifpackageloaded{pstricks}%
{\def\psset@lertcolor{\psset{linecolor=alert}}}%
{\def\psset@lertcolor{\relax}}
\newcommand{\alert}[2]{\overl@y{#1}{{\color{alert}%
\psset@lertcolor
{#2}%
\ifvmode
\unskip % undo spurious space introduced by \color
\fi}}{#2}}
\newcommand{\psalert}[2]{\overl@y{#1}{{\psset@lertcolor
{#2}}}{#2}}
\newcommand{\alertsoff}{\renewcommand{\alert}[2]{##2}%
\renewcommand{\psalert}[2]{##2}}
\newcommand{\overlaysoff}{\RenewEnviron{overlays}[1]%
{\maxoverl@y=##1%
\curoverl@y=##1%
\BODY}}
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