Re: lei: per-message keywords and externals

[Eric Wong <e@80x24.org>]

Eric Wong <e@80x24.org> wrote:
> Something I've been pondering for a bit is how to handle
> keywords (Seen, Important, Replied, ...) for messages stored in
> externals.
> 
> I want "kw:" prefix to be a usable search term, like:
> 
> 	lei q something interesting kw:seen
> 	lei q something interesting NOT kw:seen
> 
> This is no problem for imported messages in ~/.local/share/lei/store.
> All the keyword info is stored in line with the rest of the
> Xapian index data.
> 
> But, I also don't want to be wasting users' space by duplicating
> index data if they're already hosting inboxes for public
> consumption.  So, it's looking like parsing out kw: ourselves
> and do extra filtering on our end when externals are in play is
> going to be a requirement...

Something I considered a few weeks ago, but decided against, but
am again coming around to is indexing just the overview header
info in lei/store.  In other words:

	$sto->set_eml($eml->header_obj, @kw)

instead of:

	$sto->set_eml($eml, @kw)

> Or, just don't support searching using "kw:" with externals, for
> now; but still stash keywords somewhere when writing to
> traditional mail stores.

Maybe it'll be another instance of LeiStore in a separate dir
for external keywords: ~/.local/share/lei/xkw-store

> And there's also HTTP/HTTPS externals, but those will have
> transparent caching/memoization into lei/store by default, soon.

Done: https://public-inbox.org/meta/20210224233718.19007-3-e@80x24.org/