rust: hooking into Python code We introduce a new class called 'rustlazyancestors' in the ancestors module, which is used only if parsers.rustlazyancestors does exist. The implementation of __contains__ stays unchanged, but is now backed by the Rust iterator. It would probably be a good candidate for further development, though, as it is mostly looping, and duplicates the 'seen' set. The Rust code could be further optimized, however it already gives rise to performance improvements: median timing from hg perfancestors: - on pypy: before: 0.077566s after: 0.016676s -79% - on mozilla central: before: 0.190037s after: 0.082225s -58% - on a private repository (about one million revisions): before: 0.567085s after: 0.108816s -80% - on another private repository (about 400 000 revisions): before: 1.440918s after: 0.290116s -80% median timing for hg perfbranchmap base - on pypy: before: 1.383413s after: 0.507993s -63% - on mozilla central: before: 2.821940s after: 1.258902s -55% - on a private repository (about one million revisions): before: 77.065076s after: 16.158475s -80% - on another private repository (about 401 000 revisions): before: 7.835503s after: 3.545331s -54%

py3: fix test-propertycache.py Differential Revision: https://phab.mercurial-scm.org/D5101

py3: fix test-dirstate-race.t Differential Revision: https://phab.mercurial-scm.org/D5106

help: adding a proper declaration for shortlist/basic commands (API) We previously used the '^' prefix to indicate that a command should be shown on the short list (shown for just "hg"), but that's a horrible hack, so I'm removing it. Differential Revision: https://phab.mercurial-scm.org/D5069

help: assigning topic categories Differential Revision: https://phab.mercurial-scm.org/D5068

help: assigning categories to existing commands I'm separating this into its own commit so people can bikeshed over the actual categorization (vs the support for categories). These categories are based on the help implementation we've been using internally at Google, and have had zero complaints. Differential Revision: https://phab.mercurial-scm.org/D5067

help: splitting the topics by category Differential Revision: https://phab.mercurial-scm.org/D5066

help: adding support for command categories Differential Revision: https://phab.mercurial-scm.org/D5065

notify: just use email.errors email.Errors is a proxy object to email.errors on Python 2.

rust-chg: add struct holding information needed to spawn server process The Locator will handle the initialization of the connection. It will spawn server processes as needed.