[O] New Exporter: plain list depth

[Yasushi SHOJI]

Hi,

What is the best way to know the depth of list entries when I writing
an exporter back-end?

let's say I have:

#+BEGIN_SRC org
  * headline 1
    - list 1
    - list 2
      - list 2.1
#+END_SRC

I'd like to convert it to:

#+BEGIN_EXAMPLE
  * headline 1
  - list 1
  - list 2
  -- list 2.1
#+END_EXAMPLE


To generate "--" at the list 2.1, I'd like to find out the list 2.1 is
at depth 2, so that I can use (make-string 2 ?-) for my bullet.

What I came up with instead was to

     1) mark each item in item handler with "-"
     2) add a "-" in each plain-list handler
     3) remove one "-" from all list entries at final-function

it works, but it doesn't look good to me (tm).

I've checked a few exporters, including ox-html and ox-md but couldn't
find a function like org-export-get-relative-level for headline. Does
org-list-to-generic work in this situation?

Thanks,
-- 
            yashi