Repository Index Query tool and cli

Hello,

is there a query tool which can be used to search some (boolean)
expressions in an existing (local) repository index? M2E in Eclipse has
a few search dialogs which use the index, for example the archetype
selection, but I would be able to dig a bit deeper into a full index
(OSGi metadata for example). A CLI tool would be enough for this.

Something along this lines: when I use indexer-cli to generate a
repository index, is it able to generate incremental updates?

Will it detect things to scan again on the timestamps in the meta-data
files or based on filesystem timestamps?

Gruss
Bernd