setting export_file_name during export

[Leo Butler <Leo.Butler@umanitoba.ca>]

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Hello,

I am trying something new this semester: all my lecture notes are
organized into a single org file. A minor problem: I want to export each
lecture (see below) as a separate pdf file. I would like to know if
anyone has ``solved'' this problem or has a suggestion on how to do it.

Ideally, I would like to have a single function that retains only the
current subtree that contains point, sets EXPORT_FILE_NAME based on the
top heading, and exports it as a complete beamer pdf.

TIA,
Leo


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#+AUTHOR: Leo Butler
#+TITLE: Lectures in Math
#+OPTIONS: H:2 toc:t num:t
#+LATEX_CLASS: beamer
#+LATEX_CLASS_OPTIONS: [presentation]
#+STARTUP: beamer
#+EXPORT_FILE_NAME: lectures

* Lecture 1
** Lecture 1
In the beginning...This subtree should be exported to =lecture-1.pdf=.
* Lecture 2
** Lecture 2
Next...This subtree should be exported to =lecture-2.pdf=.