6.3.16.1 Example 1

The following simple example creates a new editor command called Current Line .

(editor:defcommand "Current Line" (p)  

    "Computes the line number of the current point and

     prints it in the Echo Area"

    "Prints the line number of the current point"  

    (let* ((cpoint (editor:current-point))

           (svpoint (editor:copy-point cpoint))

           (count 0))

          (editor:beginning-of-buffer-command nil)

          (loop

             (if (editor:point> cpoint svpoint)

                 (return))

             (unless (editor:next-line-command nil)

                 (return))

             (incf count))

          (editor:move-point cpoint svpoint)

          (editor:message "Current Line Number: ~S " count)))