MoreMesecons/moremesecons_luablock/init.lua

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local storage = minetest.get_mod_storage()
local pos_data = moremesecons.get_storage_data(storage, "pos_data")
local function set_data(pos, code, owner)
local data = {
code = code,
owner = owner
}
moremesecons.set_data_to_pos(pos_data, pos, data)
end
local function check_data(pos, code, owner)
local stored_data = moremesecons.get_data_from_pos(pos_data, pos)
if not stored_data then
return false
end
if code ~= stored_data.code
or owner ~= stored_data.owner then
return false
end
return true
end
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local function make_formspec(meta, pos)
local code = minetest.formspec_escape(meta:get_string("code"))
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local errmsg = minetest.formspec_escape(meta:get_string("errmsg"))
meta:set_string("formspec",
"size[10,8;]" ..
"textarea[0.5,0.5;9.5,7;code;Code;"..code.."]" ..
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"label[0.1,7;"..errmsg.."]" ..
"button_exit[4,7.5;2,1;submit;Submit]")
end
minetest.register_node("moremesecons_luablock:luablock", {
description = "Lua Block",
tiles = {"moremesecons_luablock.png"},
groups = {cracky = 2},
on_place = function(itemstack, placer, pointed_thing)
local under = pointed_thing.under
local node = minetest.get_node(under)
local udef = minetest.registered_nodes[node.name]
if udef and udef.on_rightclick and
not (placer and placer:get_player_control().sneak) then
return udef.on_rightclick(under, node, placer, itemstack,
pointed_thing) or itemstack
end
local pos
if minetest.registered_items[minetest.get_node(under).name].buildable_to then
pos = under
else
pos = pointed_thing.above
end
local name = placer:get_player_name()
if minetest.is_protected(pos, name) and
not minetest.check_player_privs(name, {protection_bypass = true}) then
minetest.record_protection_violation(pos, name)
return itemstack
end
if not minetest.check_player_privs(name, {server = true}) then
minetest.chat_send_player(name, "You can't use a LuaBlock without the server privilege.")
return itemstack
end
local node_def = minetest.registered_nodes[minetest.get_node(pos).name]
if not node_def or not node_def.buildable_to then
return itemstack
end
minetest.set_node(pos, {name = "moremesecons_luablock:luablock"})
local meta = minetest.get_meta(pos)
meta:set_string("owner", name)
meta:set_string("infotext", "LuaBlock owned by " .. name)
make_formspec(meta, pos)
if not (creative and creative.is_enabled_for
and creative.is_enabled_for(placer:get_player_name())) then
itemstack:take_item()
end
return itemstack
end,
on_receive_fields = function(pos, form_name, fields, sender)
if not fields.submit then
return
end
local name = sender:get_player_name()
local meta = minetest.get_meta(pos)
if name ~= meta:get_string("owner") then
minetest.chat_send_player(name, "You don't own this LuaBlock.")
return
end
if not minetest.check_player_privs(name, {server = true}) then
minetest.chat_send_player(name, "You can't use a LuaBlock without the server privilege.")
return
end
meta:set_string("code", fields.code)
set_data(pos, fields.code, name)
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make_formspec(meta, pos)
end,
can_dig = function(pos, player)
local meta = minetest.get_meta(pos)
return meta:get_string("owner") == player:get_player_name()
end,
on_destruct = function(pos)
moremesecons.remove_data_from_pos(pos_data, pos)
end,
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mesecons = {effector = {
action_on = function(npos, node)
local meta = minetest.get_meta(npos)
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local code = meta:get_string("code")
local owner = meta:get_string("owner")
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if code == "" then
return
end
if not check_data(npos, code, owner) then
minetest.log("warning", "[moremesecons_luablock] Metadata of LuaBlock at pos "..minetest.pos_to_string(npos).." does not match its mod storage data!")
return
end
local env = {}
for k, v in pairs(_G) do
env[k] = v
end
env.pos = table.copy(npos)
env.mem = minetest.deserialize(meta:get_string("mem")) or {}
local func, err
if _VERSION == "Lua 5.1" then
func, err = loadstring(code)
if func then
setfenv(func, env)
end
else
func, err = load(code, nil, "t", env)
end
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if not func then
meta:set_string("errmsg", err)
make_formspec(meta, pos)
return
end
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local good, err = pcall(func)
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if not good then -- Runtime error
meta:set_string("errmsg", err)
make_formspec(meta, pos)
return
end
meta:set_string("mem", minetest.serialize(env.mem))
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meta:set_string("errmsg", "")
make_formspec(meta, pos)
end
}}
})