Hi,

In one project I’m working on, we do code review of single changesets in a feature branch (usually the changesets are quite small and on average more than 10 are submitted for review at the same time). We also use Mercurial’s changeset evolution quite heavily. Feature branches are rebased regularly and single changesets are amended between two reviews (causing the descendants of these changesets to be rebased by the evolve extension).

Currently, we track the review status of each of these changesets manually. After the branch is rebased, each of the rebased changesets is shown as unreviewed in Kallihea. It would be a significant improvement if Kallithea showed for each changeset whether an “unchanged” predecessor was already approved.

Thanks to the obsoleteness markers provided by Mercurial, this is easy to determine. The algorithm would walk through the predecessors if there is only one and only the parent changed in between them, until it hits a changeset whose status is not “unreviewed”.

One question is how to show this information to the user. What would work for me is to show "approved predecessor" in all places where "approved" can be shown. Instead of a green circle, it could show the outline of a green circle. (The same could be applied to “under review” and “not approved”).

Another question is when to run the logic. Running it each time the review status is shown somewhere would work good enough for us. Caching this is not easy. It would need to be invalidated each time a predecessor is added or its review status is changed. Recomputing it each time shouldn’t be a problem in practice because the obsoleteness markers are stored in-memory, the number of considered predecessors is limited (until the algorithm hits a “changed” or already reviewed predecessor) and in most places where the review status is shown, the changeset description is also shown, which has to be read from disk, so walking the predecessors should not contribute much to the total time.

What do you think?
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