Adding better support for LuaLaTeX and XeLaTeX

Some font issues should be fixed with this. Also section numbering has
been adjusted for headings/references.

README.md

@@ -25,8 +25,8 @@ The `example` directory contains a full example:
 `example.[eps|png]` : figure used in the example white paper  
 
 ## REQUIREMENTS
-Some LaTeX packages are assumed to be present for this class to work: `mathptmx` (for the correct font), `siunitx` (for properly formatted numbers+units), and `fancyhdr` (which should be updated at some point).  
-The current version of the template is meant for use with `latex` or `pdflatex`, a modern dialect may follow in the future.
+Some LaTeX packages are assumed to be present for this class to work: e.g. `siunitx` (for properly formatted numbers+units), `booktabs`, `iftex`, and `fancyhdr` (which should be updated at some point).  
+To have fonts closely following Times New Roman, `pdflatex` requires `mathptmx` whereas `lualatex` or `xelatex` use `FreeSerif` via the `fontspec` package. 
 
 ## QUICK HOW-TO
 1) copy `template.tex` to `yourname_yourproject.tex`

prace.cls

@@ -12,7 +12,7 @@
 %%%           geometry, graphicx, ifthen, booktabs
 %%%
 \NeedsTeXFormat{LaTeX2e}
-\ProvidesClass{prace}[2021/06/29 PRACE Whitepaper class]
+\ProvidesClass{prace}[2022/05/18 PRACE Whitepaper class]
 
 \DeclareOption{onecolumn}{\OptionNotUsed}
 \DeclareOption*{\PassOptionsToClass{\CurrentOption}{article}}
@@ -28,13 +28,33 @@
    footskip=8mm
 }
 
-% select a font close to Times New Roman (this will depend on the TeX interpreter, more to come)
-\RequirePackage{mathptmx}
-
 \RequirePackage{siunitx}
 \RequirePackage{graphicx}
 \RequirePackage{ifthen}
 \RequirePackage{booktabs}
+\RequirePackage{iftex}
+
+% select a font close to Times New Roman (this will depend on the TeX interpreter, more to come)
+\ifpdftex
+   \RequirePackage{mathptmx}
+\fi
+\ifxetex
+   \RequirePackage{fontspec}
+   \setmainfont{FreeSerif} % this looks a lot like mathptmx, though metric not fully compatible
+   %\setmainfont{Liberation Serif} % this looks less like mathptmx, but has metric compatibility
+\fi
+\ifluatex
+   \RequirePackage{fontspec}
+   \setmainfont{FreeSerif}
+\fi
+
+% try and make sure \maketitle works when using UTF-8 characters and pdflatex/lualatex
+\ifpdftex
+   \RequirePackage[T1]{fontenc}
+\fi
+\ifluatex
+   \RequirePackage[utf8]{luainputenc}
+\fi
 
 % spacing between paragraphs and indents
 \RequirePackage{parskip}
@@ -207,11 +227,14 @@
 	{2.0ex \@plus.67ex}%                  afterskip, corresponding to 12pt in total
 	{\normalfont\large\itshape}}
 % redefine section, figure etc. format
-\def\thesection       {\arabic{section}.}
-\def\thesubsection    {\thesection\arabic{subsection}.}
-\def\thesubsubsection {\thesubsection\arabic{subsection}.}
-\def\figurename{Figure}
-\def\tablename{Table}
+\RequirePackage{secdot}
+\sectiondot{subsection}
+\sectiondot{subsubsection}
+%\def\thesection       {\arabic{section}}
+%\def\thesubsection    {\thesection.\arabic{subsection}}
+%\def\thesubsubsection {\thesubsection\arabic{subsection}.}
+\def\figurename       {Figure}
+\def\tablename        {Table}
 
 % add horizontal lines before and after the abstract
 \renewenvironment{abstract}%