advtrains compat

.luacheckrc

@@ -5,5 +5,10 @@ globals = {
 }
 
 read_globals = {
-	"mapsync", "mtt", "blockexchange", "travelnet", "display_api"
+	"mapsync",
+	"mtt",
+	"blockexchange",
+	"travelnet",
+	"display_api",
+	"advtrains"
 }

compat/advtrains.lua

@@ -0,0 +1,57 @@
+assert(type(advtrains.ndb.update) == "function")
+
+local advtrains_nodeids = {}
+
+minetest.register_on_mods_loaded(function()
+    for nodename, nodedef in pairs(minetest.registered_nodes) do
+        if nodedef.groups and nodedef.groups.save_in_at_nodedb then
+            advtrains_nodeids[minetest.get_content_id(nodename)] = true
+        end
+    end
+end)
+
+-- area-key -> table[pos]
+local removed_nodes = {}
+
+local function get_area_key(pos1, pos2)
+    return minetest.pos_to_string(pos1) .. "-" .. minetest.pos_to_string(pos2)
+end
+
+-- register to be removed nodedb positions
+pick_and_place.register_on_before_remove(function(pos1, pos2, node_ids)
+    if not advtrains_nodeids[node_ids] then
+        -- nothing to do
+        return
+    end
+
+    local poslist = minetest.find_nodes_in_area(pos1, pos2, {"group:save_in_at_nodedb"})
+    local areakey = get_area_key(pos1, pos2)
+    removed_nodes[areakey] = poslist
+end)
+
+-- update removed nodedb positions
+pick_and_place.register_on_remove(function(pos1, pos2)
+    local areakey = get_area_key(pos1, pos2)
+    local poslist = removed_nodes[areakey]
+    if not poslist then
+        return
+    end
+    removed_nodes[areakey] = nil
+
+    for _, pos in ipairs(poslist) do
+        advtrains.ndb.update(pos)
+    end
+end)
+
+-- update all nodedb positions
+pick_and_place.register_on_place(function(pos1, pos2, node_ids)
+    if not advtrains_nodeids[node_ids] then
+        -- nothing to do
+        return
+    end
+
+    local poslist = minetest.find_nodes_in_area(pos1, pos2, {"group:save_in_at_nodedb"})
+    for _, pos in ipairs(poslist) do
+        advtrains.ndb.update(pos)
+    end
+end)

init.lua

@@ -36,6 +36,10 @@ if minetest.get_modpath("display_api") then
 	dofile(MP.."/compat/display_api.lua")
 end
 
+if minetest.get_modpath("advtrains") then
+	dofile(MP.."/compat/advtrains.lua")
+end
+
 if minetest.get_modpath("mtt") and mtt.enabled then
 	dofile(MP .. "/configure.spec.lua")
 	dofile(MP .. "/create_tool.spec.lua")

mod.conf

@@ -1,5 +1,5 @@
 name = pick_and_place
 description = Pick and place utility
 depends = wield_events
-optional_depends = mapsync, mtt, blockexchange, travelnet, display_api
+optional_depends = mapsync, mtt, blockexchange, travelnet, display_api, advtrains
 min_minetest_version = 5.5.0