obsolete: track markers in _succs We now also store markers in _succs. It will be useful for the obsfate template that will use them to display more meaningful information like the list of users that have evolved a changeset into its successors.

obsolete: add an explicit '_succs.copy()' method Mimic the standard API for copying in the _succs class, it makes the code slightly cleaner and will be needed later for copying markers at the same time than copying the list content.

obsolete: introduce a _succs class It will be useful later when we will be adding markers to _succs in order to represent a successorset with the list of markers from the root to each successors sets. This information will be needed for the obsfate template I will introduce. Makes it a subclass of list so all callers will continue to work.

simplemerge: simplify code now that we always write to a context There's no need for an `out` abstraction between files and contexts anymore. Differential Revision: https://phab.mercurial-scm.org/D383

simplemerge: make context parameters non-optional Also update the function docstring. Differential Revision: https://phab.mercurial-scm.org/D382

simplemerge: stop accepting, and passing, file parameters Differential Revision: https://phab.mercurial-scm.org/D381

simplemerge: stop reading from, and writing to, files We now use contexts first for everything and also pass them everywhere. Differential Revision: https://phab.mercurial-scm.org/D380

simplemerge: use context paths for default labels instead of file paths This is the last place we used the filepath arguments without first using the context version. Differential Revision: https://phab.mercurial-scm.org/D379

contrib: make simplemerge script pass context-like objects `simplemerge()` will soon require context-like objects to work. Create a simple context-like object that wraps the requested files and can be passed to the new API. Differential Revision: https://phab.mercurial-scm.org/D378

simplemerge: use `ctx.decoddeddata()` instead of `repo.wreaddata` This eliminates the need for the `repo` object. Differential Revision: https://phab.mercurial-scm.org/D435

context: add `decodeddata()` to basefilectx This will be used as an abstraction by simplemerge to get the data it used to read off the filesystem. Differential Revision: https://phab.mercurial-scm.org/D434

bookmarks: allow renaming active bookmark using '.'

i18n: update check-translation script to pass import checker

demandimportpy3: update to pass import checker

contrib: always treat importlib.* as stdlib

hg: update top-level script to use modern import conventions

simplemerge: update to conform with modern import conventions

contrib: inform import checker that __builtin__ is a thing

contrib: allow importing "symbols" from mercurial

hgperf: update to conform with import style checks

contrib: update hg-ssh to conform with import style checks

contrib: have import-checker work mostly with native strings for mod names Module names are a bit awkward to deal with portably otherwise.

bundlerepo: move bundle2 part handling out to a function This moves the bundle2 part handling for bundlerepo out to a separate function so extensions can participate in bundlerepo setup when using bundle2 bundles. Differential Revision: https://phab.mercurial-scm.org/D290

bundle2: seek part back during iteration Previously, iterparts would yield the part to users, then consume the part. This changed the part after the user was given it and left it at the end, both of which seem unexpected. Let's seek back to the beginning after we've consumed it. I tried not seeking to the end at all, but that seems important for the overall bundle2 consumption. This is used in a future patch to let us move the bundlerepo bundle2-changegroup-part to be handled entirely within the for loop, instead of having to do a seek back to 0 after the entire loop finishes. Differential Revision: https://phab.mercurial-scm.org/D289

bundlerepo: move temp bundle creation to a separate function A future patch will refactor certain parts of bundlerepo initiatlization such that we need to create temp bundles from another function. Let's move this to another function to support that. Differential Revision: https://phab.mercurial-scm.org/D288

exchange: don't attempt phase exchange if phase-heads was in bundle The Mercurial core server doesn't yet include phase-heads parts in the bundle, but our Google-internal server wants to do that. Unfortunately, the usual exchange still happens even if phase-heads part is included (including the short-circuited one for old/publishing servers). That means that even if our server (again, the Google-internal one, but also future Mercurial core servers) includes a phase-heads part to indicate that some heads should be drafts, that would still get overwritten by the phase updating that happens after. So let's fix that by marking the phase step done if we receive at least one phase-heads part in the bundle. Differential Revision: https://phab.mercurial-scm.org/D440

pushvars: do not mangle repo state Setting `repo._shellvars` works but is not a clean way to pass the pushvars information from the push command to the exchange operation. Therefore change it to actually pass `pushvars` as a push operation argument instead. This makes third party extension like remotenames easier to support pushvars cleanly. The key value parsing and verification code has been moved to a lower level so it's harder to be bypassed and easier to be used in remotenames which could replace `push` command entirely. Differential Revision: https://phab.mercurial-scm.org/D423

record: fix revert -i for lines without newline (issue5651) This is a regression caused by 66117dae87f9. Code prior to 66117dae87f9 seems to miss the "\ No newline at end of file" line. Differential Revision: https://phab.mercurial-scm.org/D528