mapgen_rivers/compatibility.lua

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-- Fix compatibility for settings-related changes
-- Only loaded if the versions of the mod and the world mismatch
local function version_is_lower(v1, v2)
local d1, c1, d2, c2
while #v1 > 0 and #v2 > 0 do
d1, c1, v1 = v1:match("^(%d*)(%D*)(.*)$")
d2, c2, v2 = v2:match("^(%d*)(%D*)(.*)$")
d1 = tonumber(d1) or -1
d2 = tonumber(d2) or -1
if d1 ~= d2 then
return d1 < d2
end
if c1 ~= c2 then
return c1 < c2
end
end
return false
end
local function fix_min_catchment(settings, is_global)
local prefix = is_global and "mapgen_rivers_" or ""
local min_catchment = settings:get(prefix.."min_catchment")
if min_catchment then
min_catchment = tonumber(min_catchment)
local blocksize = tonumber(settings:get(prefix.."blocksize") or 15)
settings:set(prefix.."min_catchment", tonumber(min_catchment) * blocksize*blocksize)
local max_catchment = settings:get(prefix.."max_catchment")
if max_catchment then
max_catchment = tonumber(max_catchment)
local wpower = math.log(2*blocksize)/math.log(max_catchment/min_catchment)
settings:set(prefix.."river_widening_power", wpower)
end
end
end
local function fix_compatibility_minetest(settings)
local previous_version = settings:get("mapgen_rivers_version") or "0.0"
if previous_version == "0.0" then
fix_min_catchment(settings, true)
end
if version_is_lower(previous_version, "1.0.2-dev1") then
local blocksize = tonumber(settings:get("mapgen_rivers_blocksize") or 15)
local grid_x_size = tonumber(settings:get("mapgen_rivers_grid_x_size"))
if grid_x_size then
settings:set("mapgen_rivers_map_x_size", tostring(grid_x_size * blocksize))
end
local grid_z_size = tonumber(settings:get("mapgen_rivers_grid_z_size"))
if grid_z_size then
settings:set("mapgen_rivers_map_z_size", tostring(grid_z_size * blocksize))
end
end
end
local function fix_compatibility_mapgen_rivers(settings)
local previous_version = settings:get("version") or "0.0"
if previous_version == "0.0" then
fix_min_catchment(settings, false)
end
if version_is_lower(previous_version, "1.0.2-dev1") then
local blocksize = tonumber(settings:get("blocksize") or 15)
local grid_x_size = tonumber(settings:get("grid_x_size"))
if grid_x_size then
settings:set("map_x_size", tostring(grid_x_size * blocksize))
end
local grid_z_size = tonumber(settings:get("grid_z_size"))
if grid_z_size then
settings:set("map_z_size", tostring(grid_z_size * blocksize))
end
end
end
return fix_compatibility_minetest, fix_compatibility_mapgen_rivers