[Bug python/30816] New: [meta] Pretty-printing v2

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30816

            Bug ID: 30816
           Summary: [meta] Pretty-printing v2
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

The current pretty-printer API is somewhat simple -- too simple.
Over the years a number of desirable additions have been identified.
This bug is a meta-bug to track all of these.

Some came up in the context of DAP:

https://sourceware.org/pipermail/gdb-patches/2023-June/200503.html

These aren't too different from some varobj desires: it would
be nice to be able to query a printer to get an expression
that would evaluate to to the particular child.

The main issue with changing pretty-printers is that we never
advertised that we may extend the API.  So one main goal of
v2 should be to fix this -- not just for the additions we need
now, but also for any future changes.

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