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local safe_region_callback = {}
local safe_region_param = {}
local function check_region(name, param)
local pos1, pos2 = worldedit.pos1[name], worldedit.pos2[name] --obtain positions
if pos1 == nil or pos2 == nil then
worldedit.player_notify(name, "no region selected")
return nil
end
return worldedit.volume(pos1, pos2)
end
--`callback` is a callback to run when the user confirms
--`nodes_needed` is a function accepting `param`, `pos1`, and `pos2` to calculate the number of nodes needed
local function safe_region(callback, nodes_needed)
--default node volume calculation
nodes_needed = nodes_needed or check_region
return function(name, param)
--check if the operation applies to a safe number of nodes
local count = nodes_needed(name, param)
if count == nil then return end --invalid command
if count < 10000 then
return callback(name, param)
end
--save callback to call later
safe_region_callback[name], safe_region_param[name] = callback, param
worldedit.player_notify(name, "WARNING: this operation could affect up to " .. count .. " nodes; type //y to continue or //n to cancel")
end
end
minetest.register_chatcommand("/y", {
params = "",
description = "Confirm a pending operation",
func = function(name)
local callback, param = safe_region_callback[name], safe_region_param[name]
if not callback then
worldedit.player_notify(name, "no operation pending")
return
end
--obtain positions
local pos1, pos2 = worldedit.pos1[name], worldedit.pos2[name]
if pos1 == nil or pos2 == nil then
worldedit.player_notify(name, "no region selected")
return
end
safe_region_callback[name], safe_region_param[name] = nil, nil --reset pending operation
callback(name, param, pos1, pos2)
end,
})
minetest.register_chatcommand("/n", {
params = "",
description = "Confirm a pending operation",
func = function(name)
if not safe_region_callback[name] then
worldedit.player_notify(name, "no operation pending")
return
end
safe_region_callback[name], safe_region_param[name] = nil, nil
end,
})
return safe_region, check_region
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