Re: Gnus: caching message headers?

[Gregory Heytings]

> > I'm clearly not an expert, but would it not be enough to save and 
> > retrieve the contents of nntp-server-buffer in nnimap-retrieve-headers? 
> > Or are you thinking about a more generic solution that would work with 
> > all backends?
>
> We could do something ad-hoc for nnimap, but yes I'm thinking of 
> something more generic. All the header data (what's used to create the 
> Summary display) is held in variables that are local to the Summary 
> buffer, so in principle there's no reason we couldn't just leave the 
> local data in place when we leave the buffer. There are plenty of 
> obstacles to making it work correctly, but in principle I don't see why 
> not.

I would be happy with an ad-hoc solution for nnimap, which I suppose is 
the most used backend these days (but I could be wrong).  In fact I wasn't 
thinking of just leaving the local data in place when the summary buffer 
is left (which could eat a lot of memory), but instead to store them 
permanently in a cache on disk, and to read that file again instead of 
doing a "UID FETCH" on the server.