init.lua

local path = minetest.get_modpath(minetest.get_current_modname())
dofile(path.."/config.txt")
dofile(path.."/api.lua")

local filepath = minetest.get_worldpath()

local function save_player_data()
    local file = io.open(filepath .. "/playerdata.txt", "w")
    file:write(minetest.serialize(playerdata))
    file:close()
end

function load_player_data()
    local file = io.open(filepath .. "/playerdata.txt", "r")
    if file then
        local table = minetest.deserialize(file:read("*all"))
        if type(table) == "table" then
            return table

        end
    end
    return {}
end

local creative_inventory = {}
creative_inventory.creative_inventory_size = 0
playerdata = load_player_data()

minetest.register_on_joinplayer(function(player)
    pname = player:get_player_name()
    playerdata = load_player_data()
    if not playerdata[pname] then
        playerdata[pname] = {}
        playerdata[pname]['gamemode'] = Default_Mode
        save_player_data()
    end
    if not playerdata[pname]['gamemode'] then
        playerdata[pname]['gamemode'] = Default_Mode
        save_player_data()
        playerdata = load_player_data()
        minetest.after(0.3, function() updategamemode(pname, "0") end)
    else
        minetest.after(0.3, function() updategamemode(pname, "0") end)
    end
end)

--Ensure that all mods are loaded before editing inventory.
minetest.after(0.2, function()
local trash = minetest.create_detached_inventory("creative_trash", {
        -- Allow the stack to be placed and remove it in on_put()
        -- This allows the creative inventory to restore the stack
        allow_put = function(inv, listname, index, stack, player)
                return stack:get_count()
        end,
        on_put = function(inv, listname, index, stack, player)
            inv:set_stack(listname, index, "")
        end,
})
trash:set_size("main", 1)


creative_list = {}
for name,def in pairs(minetest.registered_items) do
        if (not def.groups.not_in_creative_inventory or def.groups.not_in_creative_inventory == 0)
                and def.description and def.description ~= "" then
            table.insert(creative_list, name)
        end

end


local inv = minetest.create_detached_inventory("creative", {
        allow_move = function(inv, from_list, from_index, to_list, to_index, count, player)
                return count
        end,
        allow_put = function(inv, listname, index, stack, player)
            return 0
        end,
        allow_take = function(inv, listname, index, stack, player)
                return -1
        end,
        on_move = function(inv, from_list, from_index, to_list, to_index, count, player)
        end,
        on_put = function(inv, listname, index, stack, player)
        end,
        on_take = function(inv, listname, index, stack, player)
            print(player:get_player_name().." takes item from creative inventory; listname="..dump(listname)..", index="..dump(index)..", stack="..dump(stack))
            if stack then
                print("stack:get_name()="..dump(stack:get_name())..", stack:get_count()="..dump(stack:get_count()))
            end
        end,
    })

table.sort(creative_list)

inv:set_size("main", #creative_list)

for _,itemstring in ipairs(creative_list) do
    inv:add_item("main", ItemStack(itemstring))
end
    creative_inventory.creative_inventory_size = #creative_list

end)

-- Create detached creative inventory after loading all mods
function updategamemode(pname, status)
    playerdata = load_player_data()
    if not status then
    print(pname.." has switched to "..playerdata[pname]['gamemode'].." Mode.")
    minetest.chat_send_all(pname.." has switched to "..playerdata[pname]['gamemode'].." Mode.")
    end
    if playerdata[pname]['gamemode'] == "Creative" then
    local player = minetest.env:get_player_by_name(pname)

    creative_inventory.set_creative_formspec(player, 1, 1)
    else

    local player = minetest.env:get_player_by_name(pname)
    creative_inventory.set_creative_formspec(player, 1, 1)

    end
end
creative_inventory.set_creative_formspec = function(player, start_i, pagenum)
playerdata = load_player_data()
    if playerdata[player:get_player_name()]['gamemode'] == "Creative" then
        inven.creative_inv(player)
    elseif playerdata[player:get_player_name()]['gamemode'] == "Survival" then
        inven.survival_inv(player)
    end
end
minetest.register_on_player_receive_fields(function(player, formname, fields)
    if not playerdata[pname]['gamemode'] == "Creative" then
        return
    end
    -- Figure out current page from formspec
    local current_page = 0
    local formspec = player:get_inventory_formspec()
    local start_i = string.match(formspec, "list%[detached:creative;main;[%d.]+,[%d.]+;[%d.]+,[%d.]+;(%d+)%]")
    start_i = tonumber(start_i) or 0

    if fields.clear_inventory then
        local inventory = {}
        player:get_inventory():set_list("main", inventory)
    end

    if fields.creative_search then
        inven.creative_searchitems(player)
    end

    if fields.creative_survival then
        inven.creative_inv(player)
    end

    if fields.creative_prev then
        start_i = start_i - 4*6
    end
    if fields.creative_next then
        start_i = start_i + 4*6
    end

    if start_i < 0 then
        start_i = start_i + 4*6
    end
    if start_i >= creative_inventory.creative_inventory_size then
        start_i = start_i - 4*6
    end

    if start_i < 0 or start_i >= creative_inventory.creative_inventory_size then
        start_i = 0
    end

    creative_inventory.set_creative_formspec(player, start_i, start_i / (6*4) + 1)
end)

minetest.register_chatcommand('gamemode',{
    params = "1 | 0",
    description = 'Switch your gamemode',
    privs = {gamemode = true},
    func = function(name, param)
        if param == "1" then
            playerdata[name]['gamemode'] = "Creative"
            save_player_data()
            minetest.chat_send_player(name, 'Your gamemode is now: '..playerdata[name]['gamemode'])
            updategamemode(name)
        elseif param == "0" then
            playerdata[name]['gamemode'] = "Survival"
            save_player_data()
            minetest.chat_send_player(name, 'Your gamemode is now: '..playerdata[name]['gamemode'])
            updategamemode(name)
        else
            minetest.chat_send_player(name, "Error: That player does not exist!")
            return false
        end
    end
})


--[[minetest.register_on_punchnode(function(pos, node, puncher)
    local pos = pos
    local pname = puncher:get_player_name()
    if playerdata[pname]['gamemode'] == "Creative" then
    minetest.after(0.1, function()
    minetest.env:remove_node(pos)
    end)
    end
end)]]

minetest.register_on_placenode(function(pos, newnode, placer, oldnode, itemstack)
    local pname = placer:get_player_name()
    if playerdata[pname]['gamemode'] == "Creative" then
    return true
    end
end)

minetest.register_privilege("gamemode", "Permission to use /gamemode.")

-- Load Crafting Table
dofile(path.."/workbench.lua")