Initial commit with working implementation

LICENSE

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+License of source code
+----------------------
+
+GNU Lesser General Public License, version 2.1
+Copyright (C) 2023-2023 Zenon Seth
+
+This program is free software; you can redistribute it and/or modify it under the terms
+of the GNU Lesser General Public License as published by the Free Software Foundation;
+either version 2.1 of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+See the GNU Lesser General Public License for more details:
+https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
+
+
+Licenses of media (textures)
+----------------------------
+
+Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
+Copyright (C) 2023-2023 Zenon Seth
+
+You are free to:
+Share — copy and redistribute the material in any medium or format.
+Adapt — remix, transform, and build upon the material for any purpose, even commercially.
+The licensor cannot revoke these freedoms as long as you follow the license terms.
+
+Under the following terms:
+
+Attribution — You must give appropriate credit, provide a link to the license, and
+indicate if changes were made. You may do so in any reasonable manner, but not in any way
+that suggests the licensor endorses you or your use.
+
+ShareAlike — If you remix, transform, or build upon the material, you must distribute
+your contributions under the same license as the original.
+
+No additional restrictions — You may not apply legal terms or technological measures that
+legally restrict others from doing anything the license permits.
+
+Notices:
+
+You do not have to comply with the license for elements of the material in the public
+domain or where your use is permitted by an applicable exception or limitation.
+No warranties are given. The license may not give you all of the permissions necessary
+for your intended use. For example, other rights such as publicity, privacy, or moral
+rights may limit how you use the material.
+
+For more details:
+http://creativecommons.org/licenses/by-sa/3.0/

init.lua

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+local shown = {}
+
+local settings = minetest.settings
+local MSG_BUBBLE_LIFETIME = tonumber(settings:get("message_bubbles_lifetime")) or 10
+local MAX_MSG_BUBBLE_LENGTH = tonumber(settings:get("message_bubbles_char_limit")) or 40
+local MSG_BUBBLE_PREFIX = settings:get("message_bubbles_prefix") or "Says: "
+
+local cumulativeTime = 0
+
+local function trim(msg)
+  if not msg or not type(msg) == "string" then return "" end
+  if string.len(msg) > MAX_MSG_BUBBLE_LENGTH then
+    return string.sub(msg, 1, MAX_MSG_BUBBLE_LENGTH)
+  else
+    return msg
+  end
+end
+
+minetest.register_on_chat_message(function(name, origMessage)
+	if minetest.get_player_privs(name).shout then
+		local player = minetest.get_player_by_name(name)
+    if not player then return end
+    local msg = "\n"..MSG_BUBBLE_PREFIX..trim(origMessage)
+    local nametag = player:get_nametag_attributes()
+    local nametagText = nametag.text
+    local hadToAddName = false
+    if shown[name] then
+      local currText = shown[name].text
+      if shown[name].wasEmpty then
+        shown[name].text = name..msg
+        shown[name].addedMsg = msg
+      else
+        shown[name].text = string.gsub(nametagText, currText, msg)
+        shown[name].addedMsg = msg
+      end
+      shown[name].time = minetest.get_gametime()
+    else
+      local addedMsg = msg
+      if not nametagText or nametagText == "" then
+        msg = name..msg
+        hadToAddName = true
+      end
+      shown[name] = {
+        text = msg,
+        addedMsg = addedMsg,
+        time = minetest.get_gametime(),
+        wasEmpty = hadToAddName,
+      }
+    end
+    nametag.text = shown[name].text
+    player:set_nametag_attributes(nametag)
+	end
+end)
+
+minetest.register_globalstep(function(dtime)
+  cumulativeTime = cumulativeTime + dtime
+  if cumulativeTime > 1 then
+    cumulativeTime = 0
+    local currTime = minetest.get_gametime()
+    for playerName, info in pairs(shown) do
+      if currTime - info.time > MSG_BUBBLE_LIFETIME then
+        local player = minetest.get_player_by_name(playerName)
+        if player then
+          local nametag = player:get_nametag_attributes()
+          if info.wasEmpty then
+            nametag.text = ""
+          else
+            nametag.text = string.gsub(nametag.text, info.addedMsg, "")
+          end
+          player:set_nametag_attributes(nametag)
+        end
+        shown[playerName] = nil
+      end
+    end
+  end
+end)

mod.conf

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+name = message_bubbles
+min_minetest_version = 5.0
+author = ZenonSeth
+description = Shows chat messages above player heads
+title = Message Bubbles

settingtypes.txt

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+
+message_bubbles_lifetime (Lifetime for message bubbles, in seconds) int 10 1 600
+message_bubbles_char_limit (Max number of characters to display per message bubble) int 40 5 500
+message_bubbles_prefix (Prefix to show before user message bubble) string Says: