From a3966d1a029cbeaaf6778313ee44dd6ada9ed369 Mon Sep 17 00:00:00 2001
From: SX <sx@minetest>
Date: Fri, 14 Feb 2020 02:07:10 +0200
Subject: Refactoring crafts formspecs components helpers

---
 helpers.lua | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 helpers.lua

(limited to 'helpers.lua')

diff --git a/helpers.lua b/helpers.lua
new file mode 100644
index 0000000..ccd8ebb
--- /dev/null
+++ b/helpers.lua
@@ -0,0 +1,38 @@
+
+-- Try to teleport player away from any closed (on) elevator node.
+elevator.teleport_player_from_elevator = function(player)
+    local function solid(pos)
+        if not minetest.registered_nodes[minetest.get_node(pos).name] then
+            return true
+        end
+        return minetest.registered_nodes[minetest.get_node(pos).name].walkable
+    end
+    local pos = vector.round(player:getpos())
+    local node = minetest.get_node(pos)
+    -- elevator_off is like a shaft, so the player would already be falling.
+    if node.name == "elevator:elevator_on" then
+        local front = vector.subtract(pos, minetest.facedir_to_dir(node.param2))
+        local front_above = vector.add(front, {x=0, y=1, z=0})
+        local front_below = vector.subtract(front, {x=0, y=1, z=0})
+        -- If the front isn't solid, it's ok to teleport the player.
+        if not solid(front) and not solid(front_above) then
+            player:setpos(front)
+        end
+    end
+end
+
+elevator.phash = function(pos)
+    return minetest.pos_to_string(pos)
+end
+
+elevator.punhash = function(pos)
+    return minetest.string_to_pos(pos)
+end
+
+-- Helper function to read unloaded nodes.
+elevator.get_node = function(pos)
+    local node = minetest.get_node_or_nil(pos)
+    if node then return node end
+    local _,_ = VoxelManip():read_from_map(pos, pos)
+    return minetest.get_node_or_nil(pos)
+end
-- 
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