CSV → Binary tilemap converter

csvtomap.py

#!/usr/bin/env python3
import sys

def main(argv):
    if len(argv) != 3:
        print(f"Usage: {argv[0} -(0|1) file.csv", file=sys.stderr)
        return 1

    if argv[1] == "-0":
        bounds = (-128, 127)
    elif argv[1] == "-1":
        bounds = (0, 255)
    else:
        print(f'Expected "-0" or "-1" as first option (LCDC.4 setting), got "{argv[1]}"', file=sys.stderr)
        return 2

    try:
        with open(argv[2]) as f:
          for (y,line) in enumerate(f):
              for (x,entry) in enumerate(map(int,line.split(','))):
                  if entry < bounds[0] or entry > bounds[1]:
                      print(f"Entry at x={x},y={y} ({entry}) not in [{bounds[0]}; {bounds[1]}]", file=sys.stderr)
                      return 1
                  sys.stdout.buffer.write(int(entry).to_bytes(1, 'little'))
    except FileNotFoundError:
        print("File not found: ", argv[2], file=sys.stderr)
        return 3


if __name__ == "__main__":
   # execute only if run as a script
   main(sys.argv)