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# destutil.py - Mercurial utility function for command destination
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#
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# Copyright Matt Mackall <mpm@selenic.com> and other
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from .i18n import _
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from . import (
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error,
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obsolete,
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)
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def destupdate(repo):
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"""destination for bare update operation
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"""
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# Here is where we should consider bookmarks, divergent bookmarks, and tip
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# of current branch; but currently we are only checking the branch tips.
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node = None
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wc = repo[None]
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p1 = wc.p1()
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try:
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node = repo.branchtip(wc.branch())
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except error.RepoLookupError:
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if wc.branch() == 'default': # no default branch!
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node = repo.lookup('tip') # update to tip
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else:
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raise error.Abort(_("branch %s not found") % wc.branch())
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if p1.obsolete() and not p1.children():
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# allow updating to successors
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successors = obsolete.successorssets(repo, p1.node())
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# behavior of certain cases is as follows,
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#
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# divergent changesets: update to highest rev, similar to what
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# is currently done when there are more than one head
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# (i.e. 'tip')
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#
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# replaced changesets: same as divergent except we know there
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# is no conflict
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#
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# pruned changeset: no update is done; though, we could
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# consider updating to the first non-obsolete parent,
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# similar to what is current done for 'hg prune'
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if successors:
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# flatten the list here handles both divergent (len > 1)
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# and the usual case (len = 1)
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successors = [n for sub in successors for n in sub]
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# get the max revision for the given successors set,
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# i.e. the 'tip' of a set
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node = repo.revs('max(%ln)', successors).first()
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return repo[node].rev()
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