obsolete: introduce caches for all meaningful sets
This changeset introduces caches on the `obsstore` that keeps track of sets of
revisions meaningful for obsolescence related logics. For now they are:
- obsolete: changesets used as precursors (and not public),
- extinct: obsolete changesets with osbolete descendants only,
- unstable: non obsolete changesets with obsolete ancestors.
The cache is accessed using the `getobscache(repo, '<set-name>')` function which
builds the cache on demand. The `clearobscaches(repo)` function takes care of
clearing the caches if any.
Caches are cleared when one of these events happens:
- a new marker is added,
- a new changeset is added,
- some changesets are made public,
- some public changesets are demoted to draft or secret.
Declaration of more sets is made easy because we will have to handle at least
two other "troubles" (latecomer and conflicting).
Caches are now used by revset and changectx. It is usually not much more
expensive to compute the whole set than to check the property of a few elements.
The performance boost is welcome in case we apply obsolescence logic on a lot of
revisions. This makes the feature usable!
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ hg init foo
$ cd foo
$ echo a > a
$ hg ci -qAm a
Default queue:
$ hg qqueue
patches (active)
$ echo b > a
$ hg qnew -fgDU somestuff
Applied patches in default queue:
$ hg qap
somestuff
Try to change patch (create succeeds, switch fails):
$ hg qqueue foo --create
abort: patches applied - cannot set new queue active
[255]
$ hg qqueue
foo
patches (active)
Empty default queue:
$ hg qpop
popping somestuff
patch queue now empty
Switch queue:
$ hg qqueue foo
$ hg qqueue
foo (active)
patches
List queues, quiet:
$ hg qqueue --quiet
foo
patches
Fail creating queue with already existing name:
$ hg qqueue --create foo
abort: queue "foo" already exists
[255]
$ hg qqueue
foo (active)
patches
Create new queue for rename:
$ hg qqueue --create bar
$ hg qqueue
bar (active)
foo
patches
Rename queue, same name:
$ hg qqueue --rename bar
abort: can't rename "bar" to its current name
[255]
Rename queue to existing:
$ hg qqueue --rename foo
abort: queue "foo" already exists
[255]
Rename queue:
$ hg qqueue --rename buz
$ hg qqueue
buz (active)
foo
patches
Switch back to previous queue:
$ hg qqueue foo
$ hg qqueue --delete buz
$ hg qqueue
foo (active)
patches
Create queue for purge:
$ hg qqueue --create purge-me
$ hg qqueue
foo
patches
purge-me (active)
Create patch for purge:
$ hg qnew patch-purge-me
$ ls -1d .hg/patches-purge-me 2>/dev/null || true
.hg/patches-purge-me
$ hg qpop -a
popping patch-purge-me
patch queue now empty
Purge queue:
$ hg qqueue foo
$ hg qqueue --purge purge-me
$ hg qqueue
foo (active)
patches
$ ls -1d .hg/patches-purge-me 2>/dev/null || true
Unapplied patches:
$ hg qun
$ echo c > a
$ hg qnew -fgDU otherstuff
Fail switching back:
$ hg qqueue patches
abort: patches applied - cannot set new queue active
[255]
Fail deleting current:
$ hg qqueue foo --delete
abort: cannot delete currently active queue
[255]
Switch back and delete foo:
$ hg qpop -a
popping otherstuff
patch queue now empty
$ hg qqueue patches
$ hg qqueue foo --delete
$ hg qqueue
patches (active)
Tricky cases:
$ hg qqueue store --create
$ hg qnew journal
$ hg qqueue
patches
store (active)
$ hg qpop -a
popping journal
patch queue now empty
$ hg qqueue patches
$ hg qun
somestuff
Invalid names:
$ hg qqueue test/../../bar --create
abort: invalid queue name, may not contain the characters ":\/."
[255]
$ hg qqueue . --create
abort: invalid queue name, may not contain the characters ":\/."
[255]
$ cd ..