Rename weather_pack mod to mcl_weather

mods/ENVIRONMENT/mcl_weather/thunder.lua

@@ -0,0 +1,60 @@
+-- turn off lightning mod 'auto mode'
+lightning.auto = false
+
+mcl_weather.thunder = {
+  next_strike = 0,
+  min_delay = 3,
+  max_delay = 12,
+  init_done = false,
+}
+
+minetest.register_globalstep(function(dtime)
+  if mcl_weather.get_weather() ~= "thunder" then 
+    return false
+  end
+  
+  mcl_weather.rain.set_particles_mode("thunder")
+  mcl_weather.rain.make_weather()
+
+  if mcl_weather.thunder.init_done == false then
+    mcl_weather.skycolor.add_layer(
+      "weather-pack-thunder-sky",
+      {{r=0, g=0, b=0},
+      {r=40, g=40, b=40},
+      {r=85, g=86, b=86},
+      {r=40, g=40, b=40},
+      {r=0, g=0, b=0}})
+    mcl_weather.skycolor.active = true
+    for _, player in pairs(minetest.get_connected_players()) do
+      player:set_clouds({color="#3D3D3FE8"})
+    end
+    mcl_weather.thunder.init_done = true
+  end
+  
+  if (mcl_weather.thunder.next_strike <= minetest.get_gametime()) then
+    lightning.strike()
+    local delay = math.random(mcl_weather.thunder.min_delay, mcl_weather.thunder.max_delay)
+    mcl_weather.thunder.next_strike = minetest.get_gametime() + delay
+  end
+
+end)
+
+mcl_weather.thunder.clear = function()
+  mcl_weather.rain.clear()
+  mcl_weather.skycolor.remove_layer("weather-pack-thunder-sky")
+  mcl_weather.skycolor.remove_layer("lightning")
+  mcl_weather.thunder.init_done = false
+end
+
+-- register thunderstorm weather
+if mcl_weather.reg_weathers.thunder == nil then
+  mcl_weather.reg_weathers.thunder = {
+    clear = mcl_weather.thunder.clear,
+    -- 10min - 20min
+    min_duration = 600,
+    max_duration = 1200,
+    transitions = {
+      [100] = "rain",
+    }
+  }
+end