[nhentai] Add support for extracting galleries based on artist page links

[TheGlassEyedVillian]

Currently gallery-dl has no support for artist links
An example of such link is:
https://nhentai.net/artist/minamoto/
These can even be sorted based on Popularity
Examples:
https://nhentai.net/artist/minamoto/popular
https://nhentai.net/artist/minamoto/popular-month
https://nhentai.net/artist/minamoto/popular-week
https://nhentai.net/artist/minamoto/popular-today

Also, it would be cool to filter some of them by tags, if possible.
For Example:
I would like to get the following link.
https://nhentai.net/artist/minamoto/
But only galleries containing the "English" and "Full Color" tag

So why not use the "search" feature on nhentai?
Because some tags and artists might have same names but different artist page links.
For example:
Suppose I want the entire gallery of an artist named "Ayane"
I would search for the following
https://nhentai.net/search/?q=ayane
But not only this bring results containing everything that has "Ayane" in it

The following query is an alternative:
https://nhentai.net/search/?q=artist%3Aayane
This does filter the galleries by artists, but since many artists have the string "Ayane" in their names, galleries containing those are returned as well.
In this case it returns results for "Ayane" as well as "Nanami Ayane"

This issue is also referenced in the following reddit post
https://www.reddit.com/r/nhentai/comments/mpez4b/search_exact_match/

AFAIK nhentai doesn't have a way to filter it out.
Thanks for considering.

[alice945]

I have opened a pull request that adds this (#1955).
To filter by tags, use the --filter argument. For example:
gallery-dl --filter "'full color' in tags and lang == 'en'" https://nhentai.net/artist/minamoto/