Load package as optional argument

Question

This is somehow related to this Load a package as optional argument:

I'm trying to load geometry package as optional, meaning: if is defined in preamble should be load with my margins, if not document will have the default geometry of article, book, report etc.

I have to mention that I'm not a programmer at all, but in my mind what I have wrote in MWE makes sens :). Basicaly I'm trying to find a formula (for my Humanistic mind) -- i.e. in simple steps, to load some packages with my specifications when I need them.

I would also appreciate some %%% comments %%% on the code, because I want to understand and to reproduce on other packages that I want to load.

With my code, margins are changing, but not with my specs...

The MWE

% !TEX program = pdflatex
% !TeX encoding = UTF-8
\documentclass{article}
\usepackage{kantlipsum}
\usepackage{testpckg}
%\usepackage{geometry}
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{filecontents}[force]{testpckg.sty}
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{testpckg}[2021/02/26 Test package]
\RequirePackage[T1]{fontenc}
\RequirePackage[utf8]{inputenc}
%\RequirePackage{xstring}

%\RequirePackage{geometry}
% -- if specified in preamble load with this specs

\newif\iftestpckg@geometry
\DeclareOption{geometry}{%
    \testpckg@geometrytrue
    \geometry{top=.5cm,bottom=.5cm,right=.5cm,left=.5cm} % <-- just for better visualization
    }
    \ProcessOptions
    \iftestpckg@geometry
    \RequirePackage{geometry} % <-- else load default geometry from article, book, report...
    \fi
\end{filecontents}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\kant
\end{document}

You can't actually prevent users from loading geometry themselves and choose their own parameters. — egreg, Feb 26 '21 at 10:59
@egreg can you please elaborate? Because I can choose my own parameters if I specify optional arguments [margin=2.5cm]. — Mafsi, Feb 26 '21 at 11:01

Ivan · Accepted Answer · 2021-02-26T11:32:30.143

1

% !TEX program = pdflatex
% !TeX encoding = UTF-8

\begin{filecontents}[force]{testpckg.sty}
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{testpckg}[2021/02/26 Test package]

\RequirePackage[T1]{fontenc}
\RequirePackage[utf8]{inputenc}

\newif\iftestpckg@geometry

\DeclareOption{geometry}{\testpckg@geometrytrue}
\ProcessOptions

\RequirePackage{geometry}

\iftestpckg@geometry
  \geometry{top=.5cm,bottom=.5cm,right=.5cm,left=.5cm}
\fi
\end{filecontents}

\documentclass{article}
\usepackage{kantlipsum}
\usepackage{testpckg}
%\geometry{margin=5cm}

\begin{document}
 \kant 
\end{document}

With \usepackage{testpckg} you will get:

With \usepackage[geometry]{testpckg} you will get:

edited Feb 26 '21 at 11:32

answered Feb 26 '21 at 11:07

Ivan

4,368

Thank you! Can I use your model to other packages? – Mafsi Feb 26 '21 at 13:01
1

Yes, of course. But just to be honest I wouldn't call it "mine" or even a "model" ;-) As a suggestion I recommend starting from an existing package to understand how to handle the options. At least I do that – Ivan Feb 26 '21 at 13:17

Load package as optional argument

The MWE

1 Answers1