new_contents: #!/usr/bin/env python3
  
  """
  This file can be used to display all indented lines in a vim otl file
  """
  
  import argparse
  import sys
  import re
  from pathlib import Path
  from collections import deque
  
  
  def check_file_exists(filename):
      if not Path(filename).exists():
          sys.exit("File {} does not exist".format(filename))
      if not Path(filename).is_file():
          sys.exit("File {} is not a file".format(filename))
  
  
  def get_indent_level(line):
      pattern = re.compile('^\t+')
      match = pattern.match(line)
      if match:
          start, end = match.regs[0]
          indent_level = end - start
      else:
          indent_level = 0
      return indent_level
  
  
  def print_level_line(line):
      print(line, end='')
      # following used for debugging
      # indent_level = get_indent_level(line)
      # print('{}  {}'.format(indent_level, line), end='')
  
  
  def is_nested(new_line, old_line):
      new_line_indent = get_indent_level(new_line)
      old_line_indent = get_indent_level(old_line)
      return new_line_indent > old_line_indent
  
  
  def main():
      parser = argparse.ArgumentParser(
          description="get matching line and all subsequent indented lines")
      parser.add_argument("indented_file", help="name of text file with indented lines")
      parser.add_argument("match", help="string to find")
      args = parser.parse_args()
      check_file_exists(args.indented_file)
      match = args.match
      with Path(args.indented_file).open() as f:
          last_match_line = None
          for line in f.readlines():
              if last_match_line is None:
                  if match in line:
                      last_match_line = line
                      print_level_line(line)
              else:
                  if is_nested(line, last_match_line):
                      print_level_line(line)
                  elif match in line:
                      print_level_line(line)
                      last_match_line = line
                  else:
                      last_match_line = None
  
  
  if __name__ == "__main__":
      main()
  
subject: add python script to filter lines