cmdfmt.py

#!python3

import sys
import shlex

write = lambda s: sys.stdout.write(s)

cmd = next(sys.stdin).strip()
elems = shlex.split(cmd)
write(elems[0])
write('\n  ')

i = 1
while i < len(elems):
    write(elems[i])
    write(' ')
    i += 1

    while i < len(elems):
        elem = elems[i]

        if elem[0] == '-':
            write('\n  ')
            break

        write(elem)
        write(' ')
        i += 1