text: # Copyright (c) Stanford University, The Regents of the University of
  #               California, and others.
  #
  # All Rights Reserved.
  #
  # See Copyright-SimVascular.txt for additional details.
  #
  # Permission is hereby granted, free of charge, to any person obtaining
  # a copy of this software and associated documentation files (the
  # "Software"), to deal in the Software without restriction, including
  # without limitation the rights to use, copy, modify, merge, publish,
  # distribute, sublicense, and/or sell copies of the Software, and to
  # permit persons to whom the Software is furnished to do so, subject
  # to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included
  # in all copies or substantial portions of the Software.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  # IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  # TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  # PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
  # OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  # PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  # LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  # -*- coding: utf-8 -*-
  
  from __future__ import absolute_import, unicode_literals, print_function, division
  
  import subprocess
  import os
  import sys
  import re
  import signal
  from subprocess import Popen
  from codecs import getencoder, getincrementaldecoder
  
  PY3 = sys.version_info[0] == 3
  
  if os.name == 'posix':
      POSIX = True
      import fcntl
      import select
  else:
      POSIX = False
  
  class SubprocessRepl(object):
      def __init__(self, cmd):
          self.encoder = getencoder('utf8')
          self.decoder = getincrementaldecoder('utf8')()
          self.popen = Popen(cmd, bufsize=1,
              stderr=subprocess.STDOUT, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
          if POSIX:
              flags = fcntl.fcntl(self.popen.stdout, fcntl.F_GETFL)
              fcntl.fcntl(self.popen.stdout, fcntl.F_SETFL, flags | os.O_NONBLOCK)
  
      def is_alive(self):
          return self.popen.poll() is None
  
      def read_bytes(self):
          out = self.popen.stdout
          if POSIX:
              while True:
                  i, _, _ = select.select([out], [], [])
                  if i:
                      return out.read(4096)
          else:
              # this is windows specific problem, that you cannot tell if there
              # are more bytes ready, so we read only 1 at a times
  
              while True:
                  byte = self.popen.stdout.read(1)
                  #debugging code
                  #file1 = open("C:\\tmp\\stdout.python.txt","ab")
                  #file1.write(byte)
                  #file1.close()
                  if byte == b'\r':
                      # f'in HACK, for \r\n -> \n translation on windows
                      # I tried universal_endlines but it was pain and misery! :'(
                      continue
                  return byte
  
      def write(self, command):
          (bytes, how_many) = self.encoder(command)
          si = self.popen.stdin
          si.write(bytes)
          si.flush()
          # debugging code
          #file2 = open("C:\\tmp\\stdin.python.txt","ab")
          #file2.write(bytes)
          #file2.close()
  
      def reset_decoder(self):
          self.decoder = getincrementaldecoder('utf8')()
  
      def read(self):
          """Reads at least one decoded char of output"""
          while True:
              bs = self.read_bytes()
              if not bs:
                  return None
              try:
                  output = self.decoder.decode(bs)
              except Exception as e:
                  output = "■"
                  self.reset_decoder()
              if output:
                  return output
    
  