CURRENT_LINE
     Returns a string representing the current line.  The current line is
     the line on which the active editing point is located.
  Syntax
     string := CURRENT_LINE
  Comments
     If the cursor is free and the current buffer is mapped to a visible
     window, using CURRENT_LINE may result in the insertion of padding
     spaces or lines from the nearest text to the cursor position.
  Example
     my_cur_line := CURRENT_LINE
     Stores in the variable MY_CUR_LINE the string representing the current
     line.
  Related topics
     CURRENT_OFFSET   CURRENT_ROW