skeleton

.github/workflows/luacheck.yml

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+name: luacheck
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: apt
+      run: sudo apt-get install -y luarocks
+    - name: luacheck install
+      run: luarocks install --local luacheck
+    - name: luacheck run
+      run: $HOME/.luarocks/bin/luacheck ./

.luacheckrc

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+globals = {
+	"advtrains"
+}
+
+read_globals = {
+	-- Stdlib
+	string = {fields = {"split"}},
+	table = {fields = {"copy", "getn"}},
+
+	-- Minetest
+	"minetest",
+	"vector", "ItemStack",
+	"dump", "screwdriver",
+
+	-- Deps
+	"default"
+}

disable_far_away.lua

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+
+-- id -> true
+local disabled_trains = {}
+
+local timer = 0
+minetest.register_globalstep(function(dtime)
+	timer = timer + dtime
+	if timer < 2 then return end
+	timer=0
+
+  disabled_trains = {}
+  local max_range = 500
+	local players = minetest.get_connected_players()
+  for id, train in pairs(advtrains.trains) do
+    disabled_trains[id] = true
+    local tpos = train.last_pos
+    for _, player in pairs(players) do
+      local ppos = player:get_pos()
+      local distance = vector.distance(tpos, ppos)
+      if distance < max_range then
+        -- enable train
+        disabled_trains[id] = nil
+      end
+    end
+  end
+end)
+
+
+local old_train_ensure_init = advtrains.train_ensure_init
+advtrains.train_ensure_init = function(k, v)
+  if disabled_trains[k] then
+    return
+  else
+    return old_train_ensure_init(k, v)
+  end
+end
+
+local old_train_step_b = advtrains.train_step_b
+advtrains.train_step_b = function(k, v, dtime)
+  if disabled_trains[k] then
+    return
+  else
+    return old_train_step_b(k, v, dtime)
+  end
+end
+
+local old_train_step_c = advtrains.train_step_c
+advtrains.train_step_c = function(k, v, dtime)
+  if disabled_trains[k] then
+    return
+  else
+    return old_train_step_c(k, v, dtime)
+  end
+end

init.lua

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+
+local MP = minetest.get_modpath("advtrains_custom")
+
+dofile(MP.."/disable_far_away.lua")