py3: add 5 new passing tests Differential Revision: https://phab.mercurial-scm.org/D6378

py3: add a r'' to prevent transformer adding b'' # skip-blame because just r'' prefix Differential Revision: https://phab.mercurial-scm.org/D6377

rust-dirstate: call parse/pack bindings from Python A future patch will need to address the issue of Rust module policy, to avoid having ugly duplicate imports and conditionals all over the place. As the rewrite of dirstate in Rust progresses, we will need fewer of those "contact points". Differential Revision: https://phab.mercurial-scm.org/D6350

rust-dirstate: add rust-cpython bindings to the new parse/pack functions This allows for Python code to call `parse/pack_dirstate` transparently. These bindings are heavy given the relatively simple task, as they are bound to implementation details of both the C and Python code. They will be slimmed down in future patches and eventually completely removed once more of the dirstate code has been refactored/rewritten in Rust. Both functions emulate the mutate-on-loop style of the Python and C implementations by looping over changed items in the compatibility layer, instead of at the core functions. Differential Revision: https://phab.mercurial-scm.org/D6349

rust-dirstate: add rust implementation of `parse_dirstate` and `pack_dirstate` Working towards the goal of having a complete Rust implementation of `hg status`, these two utils are a first step of many to be taken to improve performance and code maintainability. Two dependencies have been added: `memchr` and `byteorder`. Both of them have been written by reputable community members and are very mature crates. The Rust code will often need to use their byte-oriented functions. A few unit tests have been added and may help future development and debugging. In a future patch that uses `parse_dirstate` to stat the working tree in parallel - which neither the Python nor the C implementations do - actual performance improvements will be seen for larger repositories. Differential Revision: https://phab.mercurial-scm.org/D6348

changelog: define changelogrevision.p[12]copies for null revision Looks like I missed these in 5382d8f8530b (changelog: parse copy metadata if available in extras, 2017-12-27). `hg debugp[12]copies -r null` fails before this patch. Differential Revision: https://phab.mercurial-scm.org/D6376

copies: write empty entries in changeset when also writing to filelog When writing to both changeset and filelog (during transition), we don't want the reader to waste time by falling back to reading from the filelog when there is no copy metadata. Let's write out empty copy metadata instead (the read path is already prepared for this case). Thanks to Greg for pointing this out. Differential Revision: https://phab.mercurial-scm.org/D6306

rebase: hide help for revisions.Predicates._destautoorphanrebase

unshelve: add space to help

context: default to using branch from dirstate only in workingctx Same reasoning as previous commits: only the workingctx should know about the dirstate. committablectx now seems free of dirstate references. Differential Revision: https://phab.mercurial-scm.org/D6374

context: let caller pass in branch to committablectx.__init__() committablectx.__init__() currently looks up the branch from the dirstate unless it's passed in the extras. memctx.__init__() has a branch argument, but since committablectx.__init__() doesn't accept it, it lets that constructor look up the branch from the dirstate before it overwrites it, which seems awkward. Differential Revision: https://phab.mercurial-scm.org/D6366

context: move contents of committablectx.markcommitted() to workingctx Same reasoning as previous commits: this function updates the dirstate. By not updating the dirstate here, we also fix the close-head test. Differential Revision: https://phab.mercurial-scm.org/D6365

tests: demonstrate that close-head command updates working copy The help text for the command says "...it doesn't change the working directory", so I don't think this is intentional. Differential Revision: https://phab.mercurial-scm.org/D6364

context: move walk() and match() overrides from committablectx to workingctx Same reasoning as previous commit: these functions update the dirstate. Differential Revision: https://phab.mercurial-scm.org/D6363

context: move flags overrides from committablectx to workingctx These read from the dirstate, so they shouldn't be used in other subclasses. Differential Revision: https://phab.mercurial-scm.org/D6362

context: reuse changectx._copies() in all but workingctx This moves the dirstate-specific _copies() implementation from committablectx into workingctx where it should be (I think all dirstate-specific stuff should be moved into workingctx). The part of changectx._copies() that is for producing changeset-wide copy dicts from the filectxs is moved into basectx so it's reused by the other subclasses. The part of changectx._copies() that's about reading copy information from the changeset remains there. This fixes in-memory rebase (and makes `hg convert` able to write copies to changesets). Differential Revision: https://phab.mercurial-scm.org/D6219