Before this patch, default kind of pattern for revset predicate
"contains()" is treated as the exact file path rooted at the root of
the repository. This decreases usability, because:
- all other predicates taking pattern argument (also "filelog()")
treat such pattern as the path rooted at the current working
directory
- "contains()" doesn't describe this difference in its help
- this difference may confuse users
for example, this prevents revset aliases from sharing same
argument between "contains()" and other predicates
This patch makes default kind of pattern for revset predicate
"contains()" be rooted at the current working directory.
This patch uses "pathutil.canonpath()" instead of creating "match"
object for efficiency.
This patch narrows scope of the variable "m" in the function for
revset predicate "contains()", because it is referred only in "else"
code path of "if not matchmod.patkind(pat)" examination.
parse() cannot be called at the same time because a parser object keeps its
states. This is no problem for command-line hg client, but it would cause
strange errors in multi-threaded hgweb.
Creating parser object is not too expensive.
original:
% python -m timeit -s 'from mercurial import revset' 'revset.parse("0::tip")'
100000 loops, best of 3: 11.3 usec per loop
thread-safe:
% python -m timeit -s 'from mercurial import revset' 'revset.parse("0::tip")'
100000 loops, best of 3: 13.1 usec per loop
Some changesets can be wrongly reported as matched by this predicate
due to searching in a string joined with spaces and not individually.
A test case added, which fails without this fix.
Change ancestor to accept 0 or more arguments. The greatest common ancestor of a
single changeset is that changeset. If passed no arguments, the empty list is
returned.
Before this patch, sub expression may return unexpected result, if it
is joined with another expression by "or":
- "^"/parentspec():
"R or R^1" is not equal to "R^1 or R". the former returns only "R".
- "~"/ancestorspec():
"R or R~1" is not equal to "R~1 or R". the former returns only "R".
- ":"/rangeset():
"10 or (10 or 15):" is not equal to "(10 or 15): or 10". the
former returns only 10 and 15 or grater (11 to 14 are not
included).
In "or"-ed expression "A or B", the "subset" passed to evaluation of
"B" doesn't contain revisions gotten from evaluation of "A", for
efficiency.
In the other hand, "stringset()" fails to look corresponding revision
for specified string/symbol up, if "subset" doesn't contain that
revision.
So, predicates looking revisions up indirectly should evaluate sub
expressions of themselves not with passed "subset" but with "entire
revisions in the repository", to prevent "stringset()" from unexpected
failing to look symbols in them up.
But predicates in above example don't so. For example, in the case of
"R or R^1":
1. "R^1" is evaluated with "subset" containing revisions other than
"R", because "R" is already gotten by the former of "or"-ed
expressions
2. "parentspec()" evaluates "R" of "R^1" with such "subset"
3. "stringset()" fails to look "R" up, because "R" is not contained
in "subset"
4. so, evaluation of "R^1" returns no revision
This patch evaluates sub expressions for predicates above with "entire
revisions in the repository".
Now that changelog filtering is in place, it's become evident that
naming the filters according to the set of revs _not_ included in the
filtered changelog is confusing. This is especially evident in the
collaborative branch cache scheme.
This changes the names of the filters to reflect the revs that _are_
included:
hidden -> visible
unserved -> served
mutable -> immutable
impactable -> base
repoview.filteredrevs is renamed to filterrevs, so that callers read a
bit more sensibly, e.g.:
filterrevs('visible') # filter revs according to what's visible
This changesets add a new `divergent()` revset similar to `unstable()` and
`bumped()` one. Introducting this revset allows actuall test of the divergent
detection.
This replaces unnecessary parentrevs() calls with calculating min(parentset).
Even though the min operation is O(size of parentset), since parentrevs is
relatively expensive, this tradeoff almost always works in our favour. In a
repository with over 400,000 changesets, hg perfrevset "children(X)" takes:
Set X Before After
-1 0.51s 0.06s
-1000: 0.55s 0.08s
-10000: 0.56s 0.10s
-100000: 0.60s 0.25s
-100000:-99000 0.55s 0.19s
0:100000 0.60s 0.61s
all() 0.72s 0.74s
The relative performance is similar for Mercurial's own repository -- several
times faster in most cases, slightly slower for revisions close to 0 and
all().
When commiting to a repo with lots of history (>400000 changesets)
checking the results of revset.py:descendants against the subset takes
some time. Since the subset equals the entire changelog, the check
isn't necessary. Avoiding it in that case saves 0.1 seconds off of
a 1.78 second commit. A 6% gain.
We use the length of the subset to determine if it is the entire repo.
There is precedence for this in revset.py:stringset.
bundle() revset expression returns all changes that are present
in the bundle file (no matter whether they are in the repo or not).
Bundle file should be specified via -R option.
The old name was not very good for two reasons:
- caller does not care about "cache",
- set of revision returned may not be obsolete at all.
The new name was suggested by Kevin Bullock.
For changelog level filtering to take effect it need to be used for any
iteration. Some remaining use of `xrange` in revset code is replace by proper
use of `changelog.revs` or direct iteration over changelog.
We don't need to compute the set of all branchpoints. We can just check the
number of children that element of subset have. The extra work did not seems to
had particular performance impact but the code is simpler this way.
The branchpoint() function returns changesets with more than one child.
Eventually I would like to be able to see only branch points and merge
points in a graphical log to see the topology of the repository.
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!
"extinct" and "unstable" predicates use "obsolete" implementation
internally, but own predicate name should be used in error messages of
them instead of "obsolete".
This predicate is used to find csets that were created because of a graft,
transplant or rebase --keep. An optional revset can be supplied, in which case
the result will be limited to those copies which specified one of the revs as
the source for the command.
hg log -r destination() # csets copied from anywhere
hg log -r destination(branch(default)) # all csets copied from default
hg log -r origin(x) or destination(origin(x)) # all instances of x
This predicate will follow a cset through different types of copies. Given a
repo with a cset 'S' that is grafted to create G(S), which itself is
transplanted to become T(G(S)):
o-S
/
o-o-G(S)
\
o-T(G(S))
hg log -r destination( S ) # { G(S), T(G(S)) }
hg log -r destination( G(S) ) # { T(G(S)) }
The implementation differences between the three different copy commands (see
the origin() predicate) are not intentionally exposed, however if the
transplant was a graft instead:
hg log -r destination( G(S) ) # {}
because the 'extra' field in G(G(S)) is S, not G(S). The implementation cannot
correct this by following sources before G(S) and then select the csets that
reference those sources because the cset provided to the predicate would also
end up selected. If there were more than two copies, sources of the argument
would also get selected.
Note that the convert extension does not currently update the 'extra' map in its
destination csets, and therefore copies made prior to the convert will be
missing from the resulting set.
Instead of the loop over 'subset', the following almost works, but does not
select a transplant of a transplant. That is, 'destination(S)' will only
select T(S).
dests = set([r for r in subset if _getrevsource(repo, r) in args])
This predicate is used to find the original source of csets created by a graft,
transplant or rebase --keep. If a copied cset is itself copied, only the
source of the original copy is selected.
hg log -r origin() # all src csets, anywhere
hg log -r origin(branch(default)) # all srcs of copies on default
By following through different types of copy commands and only selecting the
original cset, the implementation differences between the copy commands are
hidden. (A graft of a graft preserves the original source in its 'extra' map,
while transplant and rebase use the immediate source specified for the
command).
Given a repo with a cset S that is grafted to create G(S), which itself is
grafted to become G(G(S))
o-S
/
o-o-G(S)
\
o-G(G(S))
hg log -r origin( G(S) ) # { S }
hg log -r origin( G(G(S)) ) # { S }, NOT { G(S) }
Even if the last graft were a transplant
hg log -r origin( T(G(S)) ) # { S }
A rebase without --keep essentially strips the source, so providing the cset
that results to this predicate will yield an empty set.
Note that the convert extension does not currently update the 'extra' map in
its destination csets, and therefore copies made prior to the convert will be
unable to find their source.
`extinct` changesets are obsolete changesets with obsolete descendants only. They
are of no interest anymore and can be:
- exclude from exchange
- hidden to the user in most situation
- safely garbage collected
This changeset just allows mercurial to detect them.
The implementation is a bit naive, as for unstable changesets. We better use a
simple revset query and a cache, but simple version comes first.
An unstable changeset is a changeset *not* obsolete but with some obsolete
ancestors.
The current logic to decide if a changeset is unstable is naive and very
inefficient. A better solution is to compute the set of unstable changeset with
a simple revset and to cache the result. But this require cache invalidation
logic. Simpler version goes first.
The new "diff" field lets you use the matching revset keyword to find revisions
that apply the same change as the selected revisions.
The match must be exact (i.e. same additions, same deletions, same modified
lines and same change context, same file renames and copies).
Two revisions matching their diff must also match their files. Thus, to match
the diff much faster we will always check that the 'files' match first, and only
then check that the 'diff' matches as well.
graft, transplant and rebase all embed a different type of source marker in
extra, and each with a different name. The current implementation of each is
such that there will never be more than one of these markers on a node.
Note that the rebase marker can only be resolved if the source is
still present, which excludes the typical rebase usage (without
--keep) from consideration (unless the resulting bundle in
strip-backup is overlayed). There probably isn't any reason to use
rebase --keep as a substitute for transplant or graft at this point,
but maybe there was at one point and there are even a few rebases in
the hg repo, so it may be of historical interest.
This selects changesets added because of repo conversions. For example
hg log -r "converted()" # all csets created by a convertion
hg log -r "converted(rev)" # the cset converted from rev in the src repo
The converted(rev) form is analogous to remote(id), where the remote repo is
the source of the conversion. This can be useful for cross referencing an old
repository into the current one.
The source revision may be the short changeset hash or the full hash from the
source repository. The local identifier isn't useful. An interesting
ramification of this is if a short revision is specified, it may cause more
than one changeset to be selected. (e.g. converted(6) matches changesets with
a convert_revision field of 6e..e and 67..0)
The convert.hg.saverev option must have been specified when converting the hg
source repository for this to work. The other sources automatically embed the
converted marker.
