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annotate mercurial/destutil.py @ 26569:2aeeef1dc9a5

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update: move default destination computation to a function We ultimately want this to be accessible through a revset, but there is too much complexity here for that to work. Especially we'll have to return more than just the destination to control the behavior (eg: bookmarks to activate, etc). To prevent cycle, a new module is created, it will receive other destination/behavior function in the future.
author Pierre-Yves David <pierre-yves.david@fb.com>
date Mon, 05 Oct 2015 01:46:47 -0700
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children 56b2bcea2529
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26569
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1 # destutil.py - Mercurial utility function for command destination
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2 #
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3 # Copyright Matt Mackall <mpm@selenic.com> and other
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from .i18n import _
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9 from . import (
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10 error,
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11 util,
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12 obsolete,
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13 )
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14
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15 def destupdate(repo):
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16 """destination for bare update operation
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17 """
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18 # Here is where we should consider bookmarks, divergent bookmarks, and tip
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19 # of current branch; but currently we are only checking the branch tips.
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20 node = None
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21 wc = repo[None]
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22 p1 = wc.p1()
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23 try:
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24 node = repo.branchtip(wc.branch())
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25 except error.RepoLookupError:
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26 if wc.branch() == 'default': # no default branch!
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27 node = repo.lookup('tip') # update to tip
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28 else:
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29 raise util.Abort(_("branch %s not found") % wc.branch())
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30
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31 if p1.obsolete() and not p1.children():
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32 # allow updating to successors
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33 successors = obsolete.successorssets(repo, p1.node())
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34
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35 # behavior of certain cases is as follows,
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36 #
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37 # divergent changesets: update to highest rev, similar to what
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38 # is currently done when there are more than one head
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39 # (i.e. 'tip')
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40 #
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41 # replaced changesets: same as divergent except we know there
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42 # is no conflict
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43 #
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44 # pruned changeset: no update is done; though, we could
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45 # consider updating to the first non-obsolete parent,
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46 # similar to what is current done for 'hg prune'
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47
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48 if successors:
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49 # flatten the list here handles both divergent (len > 1)
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50 # and the usual case (len = 1)
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51 successors = [n for sub in successors for n in sub]
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52
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53 # get the max revision for the given successors set,
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54 # i.e. the 'tip' of a set
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55 node = repo.revs('max(%ln)', successors).first()
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56 return repo[node].rev()