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* store: implement the simplified index handlingKoni Marti2022-10-271-0/+3
| | | | | | | | | | Simplify the index handling for moving to the next or previous message. Same for moving to the next or previous search results. Moving of the index variable relies on the iterator package's StartIndex and EndIndex functions. Signed-off-by: Koni Marti <koni.marti@gmail.com> Acked-by: Robin Jarry <robin@jarry.cc>
* iterator: add functionality to move indicesKoni Marti2022-10-272-0/+184
| | | | | | | | Extract the index acrobatics from the message store and move it to iterator package for re-use and to add unit tests. Signed-off-by: Koni Marti <koni.marti@gmail.com> Acked-by: Robin Jarry <robin@jarry.cc>
* iterator: implement iterators over uid/thread dataKoni Marti2022-10-273-0/+255
Implement an iterator framework for uid and thread data. Iterators ensure that the underlying data is accessed in the right order and provide an abstraction of the index handling. Iterators should be used when the order of the uids/threads is important. Signed-off-by: Koni Marti <koni.marti@gmail.com> Acked-by: Robin Jarry <robin@jarry.cc>