How do I detect/guess the encoding used in a text file?

[sgmoore]

I am processing some small text files which come from a number of sources and 
most of them do not have any indication of the encoding used.

NotePad in Windows is able to guess the encoding and display the files 
correctly.

How do I do the same in Nim?

For example, looking at some of the files in hex, some have quotations marks as 
the character 92.

So I can convert to utf-8 using something like
    
    
      var encodingConverter = encodings.open("utf-8")
      
      for tmp in txtFileName.lines:
          var line = convert(encodingConverter, tmp)
    
    
    Run

But other files use the sequence E2 80 99 which don't need any conversion and 
so the above code messes up the result.