Interfacing BitKeeper to LXR

Hi,

I'm trying to code up an interface between LXR (http://lxr.sf.net) and 
BitKeeper, to enable source browsing of the linux kernel trees.

I've run into some problems with working out what commands to use to get 
the information I need out of BitKeeper, any hints or suggestions would 
be much appreciated:

1. Discovering the contents of a directory at a certain revision

Currently I'm using "bk prs -r<rev>" from the root of the repository, 
parsing the output, building the full directory tree and then retrieving 
the contents of the directory I want.  This works, but is much slower 
than I would like - I'm having to process the entire directory tree 
simply to e.g. read the contents of the root directory.

2. Finding the contents of a file at a certain revision - e.g. x/y/z @a.b.c

The obvious command to use is "bk get -p [email protected] x/y/z", but this 
doesn't appear to work if x/y/z has been deleted after changelist a.b.c 
even if the file did exist at the specified changelist.  "bk get" just 
reports that x/y/SCCS/s.z doesn't exist, which isn't that helpful!

3. Working out whether a file exists at a certain changelist

It would be useful to be able to take a pathname, changelist combination 
and have a quick way to discover if that file exists at that revision. 
I can't work out what commands would work for that.

Any help would be much appreciated.

Cheers,

Malcolm
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