scst/scripts/list-double-blank-lines

#!/usr/bin/gawk -f

############################################################################
#
# Script that takes a patch as input and lists the line numbers of double
# blank lines in the input.
#
# Copyright (C) 2009 Bart Van Assche <bvanassche@acm.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, version 2
# of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
############################################################################

BEGIN {
  last_is_blank = 0
}

{
  is_blank = $0 ~ "^\\+$"
  if (last_is_blank && is_blank)
    print NR
  last_is_blank = is_blank
}