vector_extras/vector_meta.lua

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vector.meta = vector.meta or {}
vector.meta.nodes = {}
vector.meta.nodes_file = {
load = function()
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local nodesfile = io.open(minetest.get_worldpath()..'/vector_nodes.txt', "r")
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if nodesfile then
local contents = nodesfile:read('*all')
io.close(nodesfile)
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if contents ~= nil then
local lines = string.split(contents, "\n")
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for _,entry in ipairs(lines) do
local name, px, py, pz, meta = unpack(string.split(entry, "°"))
vector.meta.set_node({x=px, y=py, z=pz}, name, meta)
end
end
end
end,
save = function() --WRITE CHANGES TO FILE
local output = ''
for x,ys in pairs(vector.meta.nodes) do
for y,zs in pairs(ys) do
for z,names in pairs(zs) do
for name,meta in pairs(names) do
output = name.."°"..x.."°"..y.."°"..z.."°"..dump(meta).."\n"
end
end
end
end
local f = io.open(minetest.get_worldpath()..'/vector_nodes.txt', "w")
f:write(output)
io.close(f)
end
}
local function table_empty(tab) --looks if it's an empty table
if next(tab) == nil then
return true
end
return false
end
function vector.meta.nodes_info() --returns an info string of the node table
local tmp = "[vector] "..dump(vector.meta.nodes).."\n[vector]:\n"
for x,a in pairs(vector.meta.nodes) do
for y,b in pairs(a) do
for z,c in pairs(b) do
for name,meta in pairs(c) do
tmp = tmp..">\t"..name.." "..x.." "..y.." "..z.." "..dump(meta).."\n"
end
end
end
end
return tmp
end
function vector.meta.clean_node_table() --replaces {} with nil
local again = true
while again do
again = false
for x,ys in pairs(vector.meta.nodes) do
if table_empty(ys) then
vector.meta.nodes[x] = nil
again = true
else
for y,zs in pairs(ys) do
if table_empty(zs) then
vector.meta.nodes[x][y] = nil
again = true
else
for z,names in pairs(zs) do
if table_empty(names) then
vector.meta.nodes[x][y][z] = nil
again = true
else
for name,meta in pairs(names) do
if table_empty(meta)
or meta == "" then
vector.meta.nodes[x][y][z][name] = nil
again = true
end
end
end
end
end
end
end
end
end
end
function vector.meta.complete_node_table(pos, name) --neccesary because tab[1] wouldn't work if tab is not a table
local tmp = vector.meta.nodes[pos.x]
if not tmp then
vector.meta.nodes[pos.x] = {}
end
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tmp = vector.meta.nodes[pos.x][pos.y]
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if not tmp then
vector.meta.nodes[pos.x][pos.y] = {}
end
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tmp = vector.meta.nodes[pos.x][pos.y][pos.z]
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if not tmp then
vector.meta.nodes[pos.x][pos.y][pos.z] = {}
end
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tmp = vector.meta.nodes[pos.x][pos.y][pos.z][name]
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if not tmp then
vector.meta.nodes[pos.x][pos.y][pos.z][name] = {}
end
end
function vector.meta.get_node(pos, name)
if not pos then
return false
end
local tmp = vector.meta.nodes[pos.x]
if not tmp
or table_empty(tmp) then
return false
end
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tmp = vector.meta.nodes[pos.x][pos.y]
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if not tmp
or table_empty(tmp) then
return false
end
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tmp = vector.meta.nodes[pos.x][pos.y][pos.z]
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if not tmp
or table_empty(tmp) then
return false
end
-- if name isn't mentioned, just look if there's a node
if not name then
return true
end
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tmp = vector.meta.nodes[pos.x][pos.y][pos.z][name]
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if not tmp
or table_empty(tmp) then
return false
end
return tmp
end
function vector.meta.remove_node(pos)
if not pos then
return false
end
if vector.meta.get_node(pos) then
vector.meta.nodes[pos.x][pos.y][pos.z] = nil
local xarr = vector.meta.nodes[pos.x]
if table_empty(xarr[pos.y]) then
vector.meta.nodes[pos.x][pos.y] = nil
end
if table_empty(xarr) then
vector.meta.nodes[pos.x] = nil
end
else
print("[vector_extras] Warning: The node at "..vector.pos_to_string(pos).." wasn't stored in vector.meta.nodes.")
end
end
function vector.meta.set_node(pos, name, meta)
if not (name or pos) then
return false
end
vector.meta.complete_node_table(pos, name)
meta = meta or true
vector.meta.nodes[pos.x][pos.y][pos.z][name] = meta
end
minetest.register_chatcommand('cleanvectormetatable',{
description = 'Tidy up it.',
params = "",
privs = {},
func = function(name)
vector.meta.clean_node_table()
local tmp = vector.meta.nodes_info()
minetest.chat_send_player(name, tmp)
print("[vector_extras] "..tmp)
end
})
vector.meta.nodes_file.load()