gnus: The Gnus Registry
9.18 The Gnus Registry
======================
The Gnus registry is a package that tracks messages by their Message-ID
across all backends. This allows Gnus users to do several cool things,
be the envy of the locals, get free haircuts, and be experts on world
issues. Well, maybe not all of those, but the features are pretty cool.
Although they will be explained in detail shortly, here’s a quick
list of said features in case your attention span is... never mind.
1. Split messages to their parent
This keeps discussions in the same group. You can use the subject
and the sender in addition to the Message-ID. Several strategies
are available.
2. Refer to messages by ID
Commands like ‘gnus-summary-refer-parent-article’ can take
advantage of the registry to jump to the referred article,
regardless of the group the message is in.
3. Store custom flags and keywords
The registry can store custom flags and keywords for a message.
For instance, you can mark a message “To-Do” this way and the flag
will persist whether the message is in the nnimap, nnml, nnmaildir,
etc. backends.
4. Store arbitrary data
Through a simple ELisp API, the registry can remember any data for
a message. A built-in inverse map, when activated, allows quick
lookups of all messages matching a particular set of criteria.
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