ModifyFarsiEnglishSubtitleDirection: when we type rtl and ltr text in the same file in envirements which doesn't support rtl, it scrambles text. this python script tries to fix it.

sub.py

import sys

def subModify(subtitleStr):
  modified = []
  words = subtitleStr.split()
  insertIndex = -1
  curIsEn = False
  preIsEn = False
  for word in words:
    preIsEn = curIsEn
    curIsEn = False
    for char in word:
      if ord(char)>=ord('A') and ord(char)<=ord('z'):
        curIsEn = True
        break
    if curIsEn != preIsEn:
      insertIndex = 0
    else:
      insertIndex += 1
    modified.insert(insertIndex, word)
  return " ".join(modified)

def readAndSubModify(inputFile):
  modifiedLines = []
  with open(inputFile, encoding="utf8") as subtitle_file:
    skip = False
    for line in subtitle_file:
      if skip:
        modifiedLines.append(line)
        skip = False
      elif len(line)==0:
        skip = True
        modifiedLines.append(line)
      else:
        modifiedLines.append(subModify(line))
  return "\n".join(modifiedLines)
  
if len(sys.argv)==2:
    subFile = sys.argv[1]
    modified = readAndSubModify(subFile)
    with open("__"+subFile,'w', encoding="utf8") as modFile:
        modFile.write(modified)
    print("done!")
else:
    print("error! try this: python sub.py path-to-subtitle.srt")