searchforwards

  /**
    *
    * Find Forwards.  Starting at the current cursor position, locate the next
    *
    * occurrence of the character c. If the cursor reaches the end of the string
    *
    * without finding an occurrence of c then return false and return leave the
    *
    * cursor position unchanged. If the cursor finds an occurrence of c then leave
    *
    * the cursor at that position and return true.
    *
    * This operation does not change any variable other than the cursor position.
    *
    * Example:
    *
    * m i s s i s s i p p i
    *
    * ^                          cursor =  0
    *
    *
    *
    * Then perform  ff('i')
    *
    *
    *
    * m i s s i s s i p p i
    *
    *   ^                        cursor =  1: returns true
    *
    *
    *
    * Then perform  ff('i')
    *
    *
    *
    * m i s s i s s i p p i
    *
    *   ^                        cursor =  1: returns true
    *
    *
    *
    * Then perform  ff('p')
    *
    *
    *
    * m i s s i s s i p p i
    *
    *                 ^          cursor =  8: returns true
    *
    *
    *
    * Then perform  ff('s')
    *
    *
    *
    * m i s s i s s i p p i
    *
    * ^                          cursor = 0: returns false
    *
    */

  def ff( c: Char ): Boolean = {
    var a = false
    ( cursor until end ) collectFirst { case i if buffer( i ) == c => cursor = i; a = true }
    a
  }
  /*  var b = false
      ( cursor until end )
        .withFilter( x => !b )
        .withFilter( x => buffer( x ) == c )
        .foreach( x => {
          b = true
          cursor = x
        } )
      b  */