[Bug 5374] New: revsets: add around(set, depth) and extend ancestors(set[, depth]) / descendants(set[, depth])

[bugzilla at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=5374

            Bug ID: 5374
           Summary: revsets: add around(set, depth) and extend
                    ancestors(set[, depth]) / descendants(set[, depth])
           Product: Mercurial
           Version: unspecified
          Hardware: PC
                OS: Windows
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at selenic.com
          Reporter: timeless at gmail.com
                CC: mercurial-devel at selenic.com

When investigating (hg log -G, hg bisect, ...) it's common to have a sense of
what an interesting commit is, but want to see what's around it (ancestors to
some depth, descendants to some depth).

We propose to add:
around(set, depth) -- which will include all* changesets which are
ancestors/descendants of a changeset in set

and add an optional argument depth to ancestors(set) and descendants(set) as:
ancestors(set[, depth]) -- will include depth levels of ancestors of changesets
in set
descendants(set[, depth]) -- will include depth levels of descendants of
changesets in set

ancestors(set, 0) == set
descendants(set, 0) == set
around(set, 0) == set
around(set, 1) = ancestors(set, 1) + descendants(set, 1)

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