[Feature Req]: Add an option to sort wallpapers when directories specified

[ghost-in-the-zsh]

Hello,

Currently, you're able to specify a path for wallpapers in the config file (e.g. path = ~/Pictures/wallpapers/). I've noticed that every time I restart hyprpaper, it always cycles through the images in the same order. Would it be possible to add an option that would let the user specify the order in which images get cycled through? For example, if I have:

wallpaper {
    monitor = eDP-1
    path = ~/Pictures/wallpapers/
    fit_mode = contain
    timeout = 90
}

perhaps an option called sort_order = <ascending|descending|newest|oldest|random> could be added, where:

• ascending: sort by name, in ascending order
• descending: ditto, in descending order
• newest: sort by date/time, starting with the most recently added pictures
• oldest: ditto, starting with the oldest ones
• random: just pick images at random

For example:

wallpaper {
    monitor = eDP-1
    path = ~/Pictures/wallpapers/
    fit_mode = contain
    timeout = 90
    sort_order = random
}

Of course, the naming above is just for example purposes and better ones may be used, but I hope that conveys the basic idea.

[ghost-in-the-zsh]

Another alternative for the selection process could be sort_order = pattern:regexp, where it would show images that match the given pattern in its file name. For example, *-city-*.png would show pictures that match anything followed by -city- followed by anything and ending in a .png file extension.

An example of what it could look like is:

wallpaper {
    monitor = eDP-1
    path = ~/Pictures/wallpapers/
    fit_mode = contain
    timeout = 90
    sort_order = pattern:*-city-*.png
}

At this point, the sort_order key might be better off under a different name, since it'd now include the ability to filter things to show a subset of the directory contents.

Hope this makes sense.