// Zap Gremlins
//
// This macro removes non-printing characters
// (e.g., carriage returns and tabs) from a text file.
// In v1.39f, only the first 5,000 bytes are processed
// if the file name does not end in ".txt". In 1.39g and
// later, the first 100,000 bytes are processed, or use the
// optional second argument to File.openAsRawString() specify
// the limit. For example,  File.openAsRawString("", 500000)
// opens files up to 500,000 bytes in length.

  requires("1.39f");
  LF=10; TAB=9;
  s1 = File.openAsRawString("");
  n = lengthOf(s1);
  String.resetBuffer;
  for (i=0; i<n; i++) {
      c = charCodeAt(s1, i);
       if (c==LF)
          String.append("\n");
      else if (c==TAB)
          String.append(" ");
     else if (c>=32 && c<=127)
          String.append(fromCharCode(c));
  }
  s2 = String.buffer;
  print("\\Clear");
  print( s2);