Mercurial > public > mercurial-scm > hg
comparison mercurial/destutil.py @ 37787:92213f6745ed
rebase: introduce support for automatically rebasing orphan changes
_destautorebase(SRC) is based on the _destrestack(SRC) revset from
fbamend. The supporting _possibledestination function is extracted
from evolve, with minor cleanups.
We've considered some alternatives here:
* This change, but with --auto as the flag name. We're hedging our bets
on this a little in this change so that if this ends up being the wrong
direction we haven't burned the valauble --auto name on rebase.
* --destination auto: I've got reservations about the discoverability of this,
and we don't currently have a good story for a revset alias of sorts that
changes behavior depending on the context in which it's used.
* A "rebase presets" feature, where we could use the currently-an-error
positional argument space for the rebase command to define presets, so that
users could define a 'linearize' preset that specifies
--revision='orphan()-obsolete()' and --dest=_destautoorphanrebase(SRC).
Personally, I find the third option somewhat appealing, but am
hesitant to "spend" the functionality space of positional arguments to
the rebase command. We should revisit the way we expose this
functionality sometime in the 4.7 cycle once we've had a chance to vet
the implementation of the functionality.
Differential Revision: https://phab.mercurial-scm.org/D2668
| author | Augie Fackler <augie@google.com> |
|---|---|
| date | Sun, 04 Mar 2018 15:29:41 -0500 |
| parents | 2b38c80557a4 |
| children | fbd168455b26 |
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| 37786:cc932c15b9ee | 37787:92213f6745ed |
|---|---|
| 13 error, | 13 error, |
| 14 obsutil, | 14 obsutil, |
| 15 scmutil, | 15 scmutil, |
| 16 stack | 16 stack |
| 17 ) | 17 ) |
| 18 | |
| 19 def orphanpossibledestination(repo, rev): | |
| 20 """Return all changesets that may be a new parent for orphan `rev`. | |
| 21 | |
| 22 This function works fine on non-orphan revisions, it's just silly | |
| 23 because there's no destination implied by obsolete markers, so | |
| 24 it'll return nothing. | |
| 25 """ | |
| 26 tonode = repo.changelog.node | |
| 27 parents = repo.changelog.parentrevs | |
| 28 torev = repo.changelog.rev | |
| 29 dest = set() | |
| 30 tovisit = list(parents(rev)) | |
| 31 while tovisit: | |
| 32 r = tovisit.pop() | |
| 33 succsets = obsutil.successorssets(repo, tonode(r)) | |
| 34 if not succsets: | |
| 35 # if there are no successors for r, r was probably pruned | |
| 36 # and we should walk up to r's parents to try and find | |
| 37 # some successors. | |
| 38 tovisit.extend(parents(r)) | |
| 39 else: | |
| 40 # We should probably pick only one destination from split | |
| 41 # (case where '1 < len(ss)'), This could be the currently | |
| 42 # tipmost, but the correct result is less clear when | |
| 43 # results of the split have been moved such that they | |
| 44 # reside on multiple branches. | |
| 45 for ss in succsets: | |
| 46 for n in ss: | |
| 47 dr = torev(n) | |
| 48 if dr != -1: | |
| 49 dest.add(dr) | |
| 50 return dest | |
| 18 | 51 |
| 19 def _destupdateobs(repo, clean): | 52 def _destupdateobs(repo, clean): |
| 20 """decide of an update destination from obsolescence markers""" | 53 """decide of an update destination from obsolescence markers""" |
| 21 node = None | 54 node = None |
| 22 wc = repo[None] | 55 wc = repo[None] |