Add API callback specifically for players receiving mail

api.lua

@@ -10,6 +10,11 @@ function mail.register_on_receive(func)
 	mail.registered_on_receives[#mail.registered_on_receives + 1] = func
 end
 
+mail.registered_on_player_receives = {}
+function mail.register_on_player_receive(func)
+	table.insert(mail.registered_on_player_receives, func)
+end
+
 mail.registered_recipient_handlers = {}
 function mail.register_recipient_handler(func)
 	table.insert(mail.registered_recipient_handlers, func)

api.md

@@ -34,7 +34,7 @@ local success, error = mail.send({
 ```
 
 # Hooks
-On-receive mail hook:
+Generic on-receive mail hook:
 
 ```lua
 mail.register_on_receive(function(m)
@@ -42,6 +42,13 @@ mail.register_on_receive(function(m)
 end)
 ```
 
+Player-specific on-receive mail hook:
+```lua
+mail.register_on_player_receive(function(player, msg)
+    -- "player" is the name of a recipient; "msg" is a mail object (see "Mail format")
+end)
+```
+
 # Recipient handler
 Recipient handlers are registered using
 

player_recipients.lua

@@ -1,7 +1,7 @@
 local S = minetest.get_translator("mail")
 local has_canonical_name = minetest.get_modpath("canonical_name")
 
-local function deliver_mail_to_player(name, msg)
+mail.register_on_player_receive(function(name, msg)
 	-- add to inbox
 	local entry = mail.get_storage_entry(name)
 	table.insert(entry.inbox, msg)
@@ -26,14 +26,18 @@ local function deliver_mail_to_player(name, msg)
 		local receiver_messages = receiver_entry.inbox
 		mail.hud_update(name, receiver_messages)
 	end
-end
+end)
 
 mail.register_recipient_handler(function(_, pname)
 	if not minetest.player_exists(pname) then
 		return nil
 	end
-	return true, function(mail)
+	return true, function(msg)
-		deliver_mail_to_player(pname, mail)
+		for _, on_player_receive in ipairs(mail.registered_on_player_receives) do
+			if on_player_receive(pname, msg) then
+				break
+			end
+		end
 	end
 end)