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#!/usr/bin/python3
"""
Randomize the order of blocks in a MAF file. If `sample_size` is specified,
that many random blocks will be kept from the original maf
usage: %prog [sample_size] < maf > maf
"""
import random
import sys
from bx.align import maf
def __main__():
if len(sys.argv) > 1:
sample_size = int(sys.argv[1])
maf_reader = maf.Reader(sys.stdin)
maf_writer = maf.Writer(sys.stdout)
mafs = list(maf_reader)
# for m in maf_reader: mafs.append( m )
random.shuffle(mafs)
if not sample_size:
sample_size = len(mafs)
for i in range(0, sample_size):
maf_writer.write(mafs[i])
if __name__ == "__main__":
__main__()
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