From 958e981c378665f6b2e48ed17af772f54e46f8be Mon Sep 17 00:00:00 2001
From: Meik Hellmund <Meik.Hellmund@math.uni-leipzig.de>
Date: Fri, 18 Jun 2021 16:29:04 +0200
Subject: [PATCH] options changed

---
 .gitignore             |  5 +++--
 beamerthemeleipzig.sty | 38 ++++++++++++++++++++------------------
 tst.tex                | 12 +++++-------
 3 files changed, 28 insertions(+), 27 deletions(-)

diff --git a/.gitignore b/.gitignore
index e0944cd..b14d65a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -66,8 +66,9 @@ _minted*
 *~
 .#*
 
-# gnuplot
+# gnuplot in this docu
 *.gnuplot
-# tests
+
+# my tests
 tst*.pdf
 
diff --git a/beamerthemeleipzig.sty b/beamerthemeleipzig.sty
index d6f1e04..c6c19e1 100644
--- a/beamerthemeleipzig.sty
+++ b/beamerthemeleipzig.sty
@@ -76,13 +76,14 @@
 %---------------------------------------------------------------------
 \RequirePackage{tikz}
 \RequirePackage{eso-pic}
+\RequirePackage{iftex}
 
 %---------------------------------------------------------------------
 % Package Options
 %---------------------------------------------------------------------
 \newif\if@doSans
-\@doSansfalse
-\DeclareOption{noserifmath}{\@doSanstrue}
+\@doSanstrue
+\DeclareOption{serifmath}{\@doSansfalse}
 \newif\if@doSectionPage
 \@doSectionPagefalse
 \DeclareOption{nosectionpages}{\@doSectionPagetrue}
@@ -94,25 +95,26 @@
 %---------------------------------------------------------------------
 % Specification
 %---------------------------------------------------------------------
-% \if@doSans%
-% 	% sans serif math %
-% 	\usepackage[no-math]{fontspec}%	
-% 	\setmainfont{Arial}%
-% \else%
-% 	% serif math %
-% 	\usepackage{fontspec}%	
-% 	\usefonttheme[onlymath]{serif}%
-% \fi%
-% 	\newfontfamily\Light{Arial}%
-% 	\newfontfamily\Bold{Arial-Bold}%
-% 	\setsansfont{Arial}%
 
+\ifpdftex%
+    \RequirePackage[T1]{fontenc}
+\else\ifxetex
+    \RequirePackage{fontspec}
+\else\ifluatex
+    \RequirePackage{fontspec}
+\fi\fi\fi
+    
 \RequirePackage[sfdefault,lining]{FiraSans}
-%\RequirePackage[fakebold]{firamath-otf}
-%\RequirePackage{newtxsf}
-\RequirePackage[T1]{fontenc}
 \RequirePackage[nomap]{FiraMono}
-     
+
+\if@doSans%
+    % sans serif math %
+    \RequirePackage{newtxsf}%
+\else%
+    % serif math %
+    \usefonttheme[onlymath]{serif}%
+\fi%
+
 \let\Bold\firasemibold%
 \let\Light\firalight%
 \let\Normal\firabook%
diff --git a/tst.tex b/tst.tex
index f4758a8..a8d4db0 100644
--- a/tst.tex
+++ b/tst.tex
@@ -1,4 +1,4 @@
-\documentclass[noserifmath,aspectratio=169]{beamer}
+\documentclass[serifmath,aspectratio=169]{beamer}
 
 \usetheme{leipzig}
 
@@ -9,12 +9,12 @@
 \title[Leipzig]{Leipzig}
 \subtitle[Beamer Theme]{Beamer theme}
 \author{Author}
-\institute{Institute}
+\institute{Institute of Mathematics}
 \date{\today}
 \titlegraphic{}
 \location{Leipzig}
 \thankstitle{Thank You!}
-\address{Beethovenstraße 15, 04107 Leipzig}
+\address{Augustusplatz 10, 04109 Leipzig}
 \email{example@uni-leipzig.de}
 \phone{+49 1234 5678910}
 %\website{}
@@ -39,13 +39,13 @@ Enable the theme by loading
     \usetheme{leipzig}
 \end{verbatim}
 
-Note that this package only works with XeTeX/XeLaTeX, as it depends on \texttt{fontspec}.
 \end{frame}
 
 \section{Elements}
 \begin{frame}[fragile]{Package Options}
 \begin{description}
-\item[\texttt{noserifmath}] displays math using Arial
+\item[\texttt{serifmath}] displays math with serifs, using the
+  traditional CM fonts
 \item[\texttt{nosectionpages}] hides section pages.
 \item[\texttt{aspectratio=169}] to enable 16:9 aspect ratio (default is 4:3)
 \end{description}
@@ -109,8 +109,6 @@ You can \emph{emphasize} text, \alert{accent} parts or show \textbf{bold} result
       \begin{enumerate}
         \item First \item Second  \item Last
       \end{enumerate}
-
-     $$ Y = X^3 =\int \alpha^2\log (aeqwvnm) $$ 
     \column{0.33\textwidth}
       Descriptions
       \begin{description}