code: func (t *Terminal) countToRightWord() int {
  	pos := t.pos
  	for pos < len(t.line) {
  		if t.line[pos] == ' ' {
  			break
  		}
  		pos++
  	}
  	for pos < len(t.line) {
  		if t.line[pos] != ' ' {
  			break
  		}
  		pos++
  	}
  	return pos - t.pos
  }
docs: // countToRightWord returns then number of characters from the cursor to the
  // start of the next word.