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#!/usr/bin/python3
"""
Print number of bases covered by all intervals in a bed file (bases covered by
more than one interval are counted only once). Multiple bed files can be
provided on the command line or to stdin.
usage: %prog bed files ...
"""
import fileinput
import sys
from bx.bitset_builders import binned_bitsets_from_file
bed_filenames = sys.argv[1:]
if bed_filenames:
input = fileinput.input(bed_filenames)
else:
input = sys.stdin
bitsets = binned_bitsets_from_file(input)
total = 0
for chrom in bitsets:
total += bitsets[chrom].count_range(0, bitsets[chrom].size)
print(total)
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