Combining everything before begin document into a package

Question

sorry if the title is badly worded but I wasn't sure how to word it.

My question is this: I have a lot of things before \begin{document} in my latex file, maybe like 180 lines of setting up commands and use packages.

I was wondering if I could put all the code above the line \begin{document} into a package and import that in so I can save lines.

Thanks

For a single document, you can just save all the files as e.g. mypreamble.tex and then use \input{mypreamble}. No real need to make a package. — Alan Munn, Mar 10 '18 at 04:32
@AlanMunn A project specific preamble and a default preamble are different things. — Heiko Oberdiek, Mar 10 '18 at 04:37
@HeikoOberdiek Of course, but the principles of creating the package are identical. — Alan Munn, Mar 10 '18 at 04:38
@AlanMunn Not entirely. For a project I would rather use a class instead of a package, because I have then a really clean preamble for the document. — Heiko Oberdiek, Mar 10 '18 at 04:42
Could you also put the \bibliographystyle in there as well? — Vass, Mar 10 '18 at 04:45

Heiko Oberdiek · Answer 1 · 2018-03-10T04:44:29.077

You can write a class:

\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{MyProject}[2018/03/10 v1.0 Class for my project]
\LoadClass[<options>]{<class name>}% former: \documentclass[...]{...}

\RequirePackage[<options>]{<package name>}% former: \usepackage[...]{...}

% other stuff from the preamble

\endinput

\documentclass and \usepackage need other names, see above. Also, remove \makeatletter/\makeatother pairs, because \makeatletter is automatically active in class and package files.

Then use the class:

\documentclass{MyProject}
\begin{document}
  ...
\end{document}

A class or package have advantages over a simple \input:

Options can be added.
Some version support by LaTeX:
```
\documentclass{<class>}[2018/03/10]
\usepackage{<package>}[2018/03/10]
```
Then, LaTeX will warn, if the class or package are older than specified.

Combining everything before begin document into a package

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