[FEATURE REQUEST] multiple wallpaper paths

[Levizor]

Essentially the idea is to be able to specify in the configuration multiple wallpaper paths (directories or individual images), that could be merged internally, for example:

[any]
mode = "center"
paths = ["/home/foo/wallpapers/pack1", "/home/foo/wallpapers/pack2"]

I know about the recursive traversal of the directory specified, so technically we could just enter

[any]
path = "/home/foo/wallpapers"

but that would include everything under this directory, and we might not want it to.

A few ways to go about it

1. Add paths option to the config and flatten everything internally in the application.
2. Make path accept list introducing breaking changes.
3. (Hacky) Use already existing recursive feature, create symbolic directory links for specified paths in $XDG_STATE_HOME/merged (for example) and just use this path as an input, the rest will be handled.
4. I shut up and use previous solution for my possibly niche use case myself.

[danyspin97]

Hi @Levizor ! Yes, this was a feature requested before (see #124), but it has been closed since it complicates the code a bit. Since this is a highly requested and qol feature, I'll look more into it.

Add paths option to the config and flatten everything internally in the application.

This might work, the queue and ordering code needs some refactoring though.

Make path accept list introducing breaking changes.

It's easy to make path accept either a single element or a list, so no breaking change needed.

(Hacky) Use already existing recursive feature, create symbolic directory links for specified paths in $XDG_STATE_HOME/merged (for example) and just use this path as an input, the rest will be handled.

I think this might be doable, it's not the cleanest solution, but it works. get-wallpaper command needs some reworking though.