playerfactions support

[int-ua]

Lacking an ability to send mail to all players who are in the same faction as you.

[S-S-X]

Now that there's mailing list support maybe this can be somehow combined with mailing lists?

Possibly with simple mailing list sync or lookup API that allows registering dynamic mailing list builders, that would allow easily creating mailing lists for any purpose like for example mailing list for players who

• Has certain privileges
• Or some amount of XP
• Or currently exploring caves (or at some other defined area)
• Or traveling in train
• Or has home at specific town
• Or belongs to some faction
• Or whatever you can imagine without necessarily bringing it into mail mod (like server customizations)

[Emojigit]

I suggest allowing mods to register special mailing lists that, when being selected to be the receiver, executes a function provided by the mod which returns a list of player names.

[Athozus]

Yes, that would something like in bash : $(command). But now, let see how we implement this...

[S-S-X]

If you like you could also allow mailing lists to handle more complicated situations without increasing complexity of code:
instead of registering named mailing list you could allow registering lookup function that is called for every added name or every added list name.

Doing this would allow fully dynamic lists (no need to know list name beforehand), not sure if this is really useful but good to consider this possibility.

Basically most significant thing is that instead of this logic:

-- mail mod side
if name == "our-vip-recipients" then -- if custom list name is registered
    recipients = get_custom_recipient_list["our-vip-recipients"]() -- then execute specific registered function
end

-- other mod / customization side
get_custom_recipient_list["our-vip-recipients"] = function()
    return {"name1", "name2", "name3"} -- return names
end

would become something like this:

-- mail mod side
recipients = get_custom_recipient_list("our-vip-recipients") -- execute all registered functions

-- other mod / customization side
local original_get_custom_recipient_list = get_custom_recipient_list
function get_custom_recipient_list(name)
    if name == "our-vip-recipients" then -- if asked list name is our list
        return {"name1", "name2", "name3"} -- return names
    end
    return original_get_custom_recipient_list(name) -- not our list, call through rest of the chain
end

Which makes all registered custom lookup functions to run until match is found. This is a lot more useful in some situations but can also cause more complicated issues and conflicts.