Discussion on a possible directive called (:filelist:)

Original post from Christian:

Today one of the users of requested an index of all the
uploaded files. Unfortunately I can't use the regular (:attachlist:) since
the site's upload area allows nested directories. I manually generated a 
list to temporarily satisfy him, see here for an actual text listing of 
the files that are uploaded on the site:

Using a static text listing isn't a very good solution in the long run of
course.... My first thought was that I could write a new version of the
directive (:attachlist:) which can handle a nested directory structure. It
shouldn't be too hard, especially as I've done it once for PmWiki 0.6.

Then I started thinking... the new (:pagelist:) is *really* powerful, 
what if we could have something similar for attachments?

Writing something like (:pagelist:) for attachments is beyond my scope
right now, but I think it's a functionality that'd greatly improve PmWiki. 

So I'd like to get some thoughts and comments on what functionality a
directive such as (:filelist:) should have. That's just a working name by
the way, it might eventually simply replace (:attachlist:).

Here is some of the basic functionality that I'd like to suggest. Please
note that I'm not saying it necessarily should be implented using a single

* The core functionality is to generate a listing of files in a 
  specified directory tree. 

* The nesting level should be controllable, making it possible to only
  list files in a single directory.

* Some kind of filtering should be applied to the listing, just like
  (:pagelist:) only lists pages matching the search criteria.
-> This makes it possible to "find" a file...

* It should be possible to choose the "format" of the listing, i.e.
  control how much information is shown about each file.

This is some of the basic functionality, but there is something else that
is similar to John Rankin's teasers that I'd like to have for attachments
(both for files and directories actually). Let me try and explain:

What I'd like is the ability to associate a short description to
attachments, which could then be shown in the file listing. Here's an 
imagined scenario:

* A "reader" clicks on a wiki page that contains a file listing. Some of 
  the files have a short description/comment shown next to it, explaining
  what this file is. Perhaps there's also a link to a wiki page with more

* An "author" clicks on a wiki page that contains a file listing. He
  notices that one of the file doesn't have a description, so he click's
  the 'Comment'-button next to the file in order to add a description.

>From an implementation point of view, these descriptions could perhaps be 
stored on a wiki page in a format like this:

:dir/subdir/filename: This is the description of the file ... bla.

:dir/subdir/filename2: This is the description of the file ...

The directive (:filelist:) would then be told from which wiki page it 
should extract file descriptions, and show them next to corresponding 
file. Adding a description to a file would be a matter of appending an 
entry to the description page.

It's late so I'm going to break off here, g'night!
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