#
# monthly reporting interval, no end dates, shows just the intervals with data:
./hledger -f- register --period 'monthly'
<<<
2010/2/1 x
  a  1
  b
>>>
2010/02/01 - 2010/02/28         a                                 1            1
                                b                                -1            0
#
# with --empty, the same:
./hledger -f- register --period 'monthly' --empty
<<<
2010/2/1 x
  a  1
  b
>>>
2010/02/01 - 2010/02/28         a                                 1            1
                                b                                -1            0
#
# with --empty and start/end dates, show all intervals covering the specified period
./hledger -f- register --period 'monthly from 2010/1/10 to 2010/3/15' --empty
<<<
2010/2/1 x
  a  1
  b
>>>
2010/01/01 - 2010/01/31                                           0            0
2010/02/01 - 2010/02/28         a                                 1            1
                                b                                -1            0
2010/03/01 - 2010/03/31                                           0            0
#
# with just one start/end date, get the other from the data
./hledger -f- register --period 'monthly from 2010/1/10' --empty
<<<
2010/2/1 x
  a  1
  b
>>>
2010/01/01 - 2010/01/31                                           0            0
2010/02/01 - 2010/02/28         a                                 1            1
                                b                                -1            0