Get potential full size of a map from a list of Minecraft region files

minecraft-region-minmax.py

from __future__ import print_function
import re
from sys import argv, exit

pattern = r'.*r\.(-?[0-9]+)\.(-?[0-9]+)\.mca$'
matcher = re.compile(pattern)

north, south, east, west = None, None, None, None


def region_blocks(rx, rz):
    min_x = 512 * rx
    max_x = min_x + 511
    min_z = 512 * rz
    max_z = min_z + 511
    return min_x, max_x, min_z, max_z

for filename in argv[1:]:
    match = matcher.match(filename)
    if match:
        anvil_x, anvil_z = map(int, match.groups())
        if west is None or anvil_x < west[0]:
            west = anvil_x, filename
        if north is None or anvil_z < north[0]:
            north = anvil_z, filename
        if east is None or anvil_x > east[0]:
            east = anvil_x, filename
        if south is None or anvil_z > south[0]:
            south = anvil_z, filename
    else:
        print("Not a region file: {0}".format(filename))

if None in (north, south, east, west):
    print("No region filenames found")
    exit(1)

min_x, _, min_z, _ = region_blocks(west[0], north[0])
_, max_x, _, max_z = region_blocks(east[0], south[0])

for direction, value in (('west', west), ('north', north), ('east', east), ('south', south)):
    print("Most {0}ern region file is {1} at {2}".format(direction, value[1], value[0]))
print("Possible blocks span ({0}, {1}) to ({2}, {3})".format(min_z, min_x, max_z, max_x))
print("x-delta, z-delta is {0}, {1}".format(abs(max_x - min_x + 1), abs(max_z - min_z + 1)))