Multiple arguments for modules in LyX - Importing algorithms2e with multiple options in LyX

Question

I want to use the algorithm2e package in LyX (version 2.2.3). There is a LyX module that makes this task simple. However, I would like to adjust the arguments with which the package is imported.

The LaTeX code generated by LyX reads

\usepackage{algorithm2e}

What I want is something like

\usepackage[lined, algonl, boxed]{algorithm2e}

As pointed out in this post, the options with which a package imported by a module is loaded can be changed by going to Document > Settings > Local Layout and entering package options like

PackageOptions algorithm2e lined

This adds the line

\PassOptionsToPackage{lined}{algorithm2e}

to the source code before the import of algorithm2e. Accordingly, I have tried to pass multiple arguments:

PackageOptions algorithm2e lined
PackageOptions algorithm2e algonl
PackageOptions algorithm2e boxed

However, only the last PackageOptions line is considered in the code, which reads

\PassOptionsToPackage{boxed}{algorithm2e}
\usepackage{algorithm2e}

This might be wanted behaviour (or not - I do not know whether PassOptionsToPackage can be applied multiple times). Nevertheless, the question remains: How can I add multiple package options?

I have tried to import algorithm2e in the "Latex-Preamble" in the document settings of LyX. However, this results in a conflict with the internal LyX solution. I get an error stating Command \algorithm already defined.

Would it be an option to write a new LyX module with adjusted import? How could I do this? The LyX documentation on modules is not detailed. I looked at the code of the algorithm2e module but did neither understand it completely nor find a line that I could adjust accordingly.

Answer 1

Load the algorithm2e module from Document > Settings... > Modules and then add the following to your Local Layout:

Format 60
PackageOptions algorithm2e "lined, algonl, boxed"

This ensures that all 3 options are passed to algorithm2e when loaded.

Answer 2

Werner's is the correct solution.

However, as an alternative, you could do the following.

Do not add the predefined module.

Go to Document > Settings > LaTeX Preamble and add directly:

\usepackage[lined, algonl, boxed]{algorithm2e}

The drawback of this solution is that, afterwards, you have to insert your algorithm by ERT code directly:

because, not having loaded its module, LyX doesn't know you're using that package.