level-option
    Indicates the level to be set or changed. The indentation keywords
    and their effects are as follows:

 CURRENT
    Sets the indentation level count to the beginning of the text on
    the current line.

 CURSOR
    Sets the indentation level count to the column currently occupied
    by the cursor.

 LEFT
    Decreases the indentation level count by the current tab
    increment.

 RIGHT
    Increases the indentation level count by the current tab
    increment.