templatekw: add a {negrev} keyword Revision numbers are getting much maligned for two reasons: they are too long in large repos and users get confused by their local-only nature. It just occurred to me that negative revision numbers avoid both of those problems. Since negative revision numbers change whenever the repo changes, it's much more obvious that they are a local-only convenience. Additionally, for the recent commits that we usually care about the most, negative revision numbers are always near zero. This commit adds a negrev templatekw to more easily expose negative revision numbers. It's not easy to reliably produce this output with existing keywords due to hidden commits while at the same time ensuring good performance.

tests: correct the remaining fallout from recent path style changes on Windows Per @martinvonz, `ui.slash` set by the test runner is now capable of playing a more active role.[1] I verified that both of these work by setting `ui.slash` to False, but these changes seem cleaner. The problem with check-perf-code.py was that the proper imports were not being whitelisted due to '\' vs '/'. [1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2019-February/128701.html

templates: adding a config() function for template customization This allows templates to be written such that users can customize them easily, or that they can be customized based on other configuration of the system. For enterprise deployments, we often have complex template aliases, and right now the only way individual users can customize those is by replacing the whole template alias (which means they won't get company-wide updates to it anymore, plus most users don't want to have to get a complex template right). With this change, they can just set a config option which feeds into our templates for common changes (e.g. whether to limit commit descriptions to the width of their terminal or not). To work around the issue of having to register the config options, I declared a dedicated section [templateconfig] for these options to be dynamically declared. They can still reference any other config option that's registered elsewhere. I only did string, bool and int at this time - list and date would add other complications with parsing the default so I'll leave that as an exercise to the reader :) Differential Revision: https://phab.mercurial-scm.org/D5959

changegroup: don't try to prune manifest nodes if not ellipses In non-ellipses case, the number of manifest nodes can be very big, and finding whether one of them can be pruned or not is very costly. For each node, we try to find the rev and the linkrev, which is expensive. Sending bit more manifest nodes seems better and much faster here. On our internal repository, this saves around 5 seconds on `hg tracked --addinclude <some_path>` on a narrow repo with ellipses disabled. Differential Revision: https://phab.mercurial-scm.org/D5782

branchmap: improve doc about BranchMapCache class It was confusing that we are having two different branchcache and BranchMapCache classes. The doc in BranchMapCache class was not much helpful to understand the difference. This patch improves the doc there. Differential Revision: https://phab.mercurial-scm.org/D5933

rust: itering less on MissingAncestors.bases for max() Instead of iterating on the whole `self.bases` each time to find its max, we keep the latter in a separate member attribute and keep it up to date in `add_bases()` On a perfdiscovery done on PyPy, with repos prepared with `contrib/discovery-helper.sh 50 100`, this gives a slight improvement (around 0.5% on wall time, but 10% on CPU) before: ! wall 0.172801 comb 0.180000 user 0.180000 sys 0.000000 (median of 541) after: ! wall 0.171798 comb 0.160000 user 0.160000 sys 0.000000 (median of 551) (perf command run time upped because of bigger variability during this test). Differential Revision: https://phab.mercurial-scm.org/D5945

rust: stop putting NULL_REVISION in MissingAncestors.bases As noted in initial review of MissingAncestors, adding NULL_REVISION in constructor in case the given `bases` is empty wasn't really useful, yet it's been kept for identity with the Python implementation Differential Revision: https://phab.mercurial-scm.org/D5944

rust: less set lookups in MissingAncestors using the return values of HashSet::remove(), we can factor pairs of `contains()/remove()` into a single `remove()`. On a perfdiscovery run done on the PyPy repository, prepared with contrib/discovery-helper.sh 50 100, I do get a modest improvement with this (mean of medians of three runs is better by 2%) Sample readings, before this change: ! wall 0.175609 comb 0.180000 user 0.180000 sys 0.000000 (median of 58) With this change: ! wall 0.171662 comb 0.180000 user 0.170000 sys 0.010000 (median of 60) Differential Revision: https://phab.mercurial-scm.org/D5943

rust: less set lookups in AncestorsIterator This uses the boolean return of `HashSet::insert()` to factor pairs of contains()/insert() into a single insert() On the mozilla-central repository (450k changesets), I get about a bit more than 10% better medians in perfancestors (taking the mean of three runs) Best run for parent changeset: ! wall 0.106474 comb 0.110000 user 0.110000 sys 0.000000 (median of 93) Best run for this changeset: ! wall 0.093191 comb 0.090000 user 0.090000 sys 0.000000 (median of 100) Differential Revision: https://phab.mercurial-scm.org/D5942

obsutil: don't assume leftctx and rightctx repo as same Backed out changeset 520514af2d93. hgsubversion can pass leftctx and rightctx which are instances of two different repositories. This was making tests fail on hgsubversion with 4.9. The two different instances are: (Pdb) p rightctx.repo() <filteredrepo:served <hgsubversion.svnrepo.svnlocalrepo object at 0x7fe29d296d10>> (Pdb) p leftctx.repo() <filteredrepo:visible <hgsubversion.svnrepo.svnlocalrepo object at 0x7fe29d494590>> Differential Revision: https://phab.mercurial-scm.org/D5968