From c78bf1428ff4e63b165edb04d07317b7181dadd2 Mon Sep 17 00:00:00 2001
From: Cedric Haase <cedric@sineband.de>
Date: Sun, 17 Dec 2017 21:16:00 +0100
Subject: [PATCH] Display owner group names on failed interaction

---
 api.lua      | 15 ++++++++++++++-
 interact.lua |  6 +++++-
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/api.lua b/api.lua
index 5f3e73e..b5cfe3e 100644
--- a/api.lua
+++ b/api.lua
@@ -87,11 +87,24 @@ end
 function areas:getNodeOwners(pos)
 	local owners = {}
 	for _, area in pairs(self:getAreasAtPos(pos)) do
-		table.insert(owners, area.owner)
+    if area.owner and (area.owner ~= "") then
+      table.insert(owners, area.owner)
+    end
 	end
 	return owners
 end
 
+-- Returns a table (list) of all groups that own an area
+function areas:getNodeOwnerGroups(pos)
+  local ownerGroups = {}
+  for _, area in pairs(self:getAreasAtPos(pos)) do
+    if area.group then
+      table.insert(ownerGroups, area.group)
+    end
+  end
+  return ownerGroups
+end
+
 --- Checks if the area intersects with an area that the player can't interact in.
 -- Note that this fails and returns false when the specified area is fully
 -- owned by the player, but with multiple protection zones, none of which
diff --git a/interact.lua b/interact.lua
index 2e54800..9da2ab7 100644
--- a/interact.lua
+++ b/interact.lua
@@ -1,4 +1,3 @@
-
 local old_is_protected = minetest.is_protected
 function minetest.is_protected(pos, name)
 	if not areas:canInteract(pos, name) then
@@ -10,6 +9,11 @@ end
 minetest.register_on_protection_violation(function(pos, name)
 	if not areas:canInteract(pos, name) then
 		local owners = areas:getNodeOwners(pos)
+
+    if not owners[1] then
+      owners = areas:getNodeOwnerGroups(pos)
+    end
+
 		minetest.chat_send_player(name,
 			("%s is protected by %s."):format(
 				minetest.pos_to_string(pos),