[WIP] Added AssetManager for supplying additional theme files

[bdudelsack]

Hello,

i've implemented a basic asset manager for adding some static theme files (like CSS or JS). It can be used in a template like:

$this->assets->addFile("css/styles.css");

Could you please check if it's an acceptable implementation for you?

It lacks subdirectory functionality and unit tests yet.

[pmjones]

(/me furrows brow)

I have to wonder if asset management isn't a little outside the scope of Bookdown here. Would not a designer's toolkit be in charge of the needed asset work?

[bdudelsack]

Maybe there is some misunderstanding what i mean with asset management.

I wanted to create some advanced templates for bookdown (like one from mkdocs or read-the-docs) but i need to include some files like fonts, css and javascript into my template.

[bdudelsack]

Here is an example how assets are used in the template to include some CSS and JS files.

https://github.com/bdudelsack/bookdown-template/tree/feature/assets

I think the best way would be to parse SCRIPT and LINK tags and add those files automaticaly and use explicit calls to asset manager only for resource like fonts which are included in CSS files.