errors: make ParseError a subtype of Abort I didn't plan this before, but the previous two changes made it really easy to make `ParseError` a subtype of `Abort`. It seems obvious with hindsight that I *should* have planned it :) Differential Revision: https://phab.mercurial-scm.org/D9350

tests: make doctests not depend on str(ParseError()) format `ParseError` implements `__bytes__`, but it doesn't implement `__str__`, so it gets the default `__str__` implementation. The next patch will make it so `ParseError` gets a `__str__` implementation, which changes the format slightly. This prepares by making us not depend on the format. Differential Revision: https://phab.mercurial-scm.org/D9349

errors: format "abort: " text in a new Abort.format() method This remove some duplication we had. Differential Revision: https://phab.mercurial-scm.org/D9348

errors: make formatparse() an instance method on ParseError It's just a little simpler this way. Don't ask me what the "hg: " prefix signifies to the user, I just left it as it was. I think we should consider changing the prefixes later (maybe always use "abort: ", or maybe use more specific prefixes in general). Differential Revision: https://phab.mercurial-scm.org/D9347

errors: create "similarity hint" for UnknownIdentifier eagerly in constructor No code wanted to do anything but to produce a hint from it anyway, so we might as well just store the hint in the exception (which already extended `Hint`). That way we can easily convert it to a `ConfigException` when it's parsing of configuration that fails. I was wondering if the purpose of lazily creating the string was so we don't create it in cases where it won't get printed anyway. However, I couldn't find any places where that could happen. If we do find such places, we could instead revert to making it lazy but add a function on `UnknownIdentifier` for creating the hint string. I dropped the comment saying "make sure to check fileset first, as revset can invoke fileset", which was added in 4e240d6ab898 (dispatch: offer near-edit-distance suggestions for {file,rev}set functions, 2015-01-26). I couldn't figure out what it meant. The author of that patch also did not remember the reason for it. Perhaps changes that have happened since then made it so it no longer matters. Differential Revision: https://phab.mercurial-scm.org/D9346

errors: move similarity_hint() to error module I want to be able to reuse it from `UnknownIdentifier`'s constructor. Moving it results in a new import of `difflib` in the `error` module. There was a comment at the top of `error.py` saying "Do not import anything but pycompat here, please", which was added (except for the "pycompat" bit) in 08cabecfa8a8 (errors: move revlog errors, 2009-01-11). I don't know the reason for the comment. I'm guessing the point was to not make the module depend on other Mercurial modules. If that was it, then importing `difflib` should be fine. Sorry about the churn (I moved this code from the `dispatch` module to the `scmutil` module very recently). Differential Revision: https://phab.mercurial-scm.org/D9345

errors: morph reportsimilar() into similarity_hint() The next step is to eagerly create the hint in `UnknownIdentifier`'s constructor. Differential Revision: https://phab.mercurial-scm.org/D9344

errors: restructure formatparse() to clarify conditions a bit The `similar` list will be calculated only for `error.UnknownIdentifier`. It was then printed only if `inst.location is None`, which is true for that exception type, but it's an indirect condition to rely on. Also, it looked from the code like it could both report similarities and print a hint. That would be a little awkward because the similarity report looks similar to the hint (both are printed within parentheses). I also added a `elif` to clarify that. I plan to refactor this more coming patches so the similarity report actually is a hint. Differential Revision: https://phab.mercurial-scm.org/D9343

pyoxidizer: run buildifier Differential Revision: https://phab.mercurial-scm.org/D9342

errors: raise InputError in `hg absorb` Differential Revision: https://phab.mercurial-scm.org/D9340

errors: introduce CanceledError and use it in a few places This very similar to earlier patches (e.g. for `InputError`) and part of https://www.mercurial-scm.org/wiki/ErrorCategoriesPlan. Differential Revision: https://phab.mercurial-scm.org/D9339

errors: raise InputError in `hg split` Differential Revision: https://phab.mercurial-scm.org/D9338

errors: raise StateError in `hg bisect` Differential Revision: https://phab.mercurial-scm.org/D9337

errors: raise InputError in `hg debugobsolete` Differential Revision: https://phab.mercurial-scm.org/D9336

errors: raise InputError when line range to followlines() is out of bounds Differential Revision: https://phab.mercurial-scm.org/D9333

transaction: split new files into a separate set Journal entries with size 0 are common as they represent new revlog files. Move them from the dictionary into a set as the former is more dense. This reduces peak RSS by 70MB for the NetBSD test repository with around 450k files under .hg/store. Differential Revision: https://phab.mercurial-scm.org/D9278

transaction: change list of journal entries into a dictionary The transaction object used to keep a mapping table of path names to journal entries and a list of journal entries consisting of path and file offset to truncate on rollback. The offsets are used in three cases. repair.strip and rollback process all of them in one go, but they care about the order. For them, it is perfectly reasonable to read the journal back from disk as both operations already involve at least one system call per journal entry. The other consumer is the revlog logic for moving from inline to external data storage. It doesn't care about the order of the journal and just needs to original offset stored. Further optimisations are possible here to move the in-memory journal to a set(), but without memoisation of the original revlog size this could turn it into O(n^2) behavior in worst case when many revlogs need to migrated. Differential Revision: https://phab.mercurial-scm.org/D9277

transaction: rename find to findoffset and drop backup file support transaction.find used to support access to both the regular file and backup file list. They have different formats, so any consumer has to be aware of the difference alredy. There is no in-core consumer for the backup file access, so don't provide it. Differential Revision: https://phab.mercurial-scm.org/D9276

transaction: drop per-file extra data support At the moment, transactions support an optional extra data argument for all files to be stored in addition to the original offset. This is used in core only by the revlog inline to external data migration. It is used to memoize the number of revisions before the transaction. That number of can be computed during the walk easily, so drop the requirement. Differential Revision: https://phab.mercurial-scm.org/D9275

templates: define a {onelinesummary} keyword It is sometimes useful to be able to use the configured `command-template.oneline-summary` in higher-level templates. For example, I would like to use it in an internal template that lists commits in a "review unit" (kind of a pull request). This patch adds support for that. We may want to define a way of formatting a context using a command-specific override (from `command-templates.oneline-summary.<command>`), but that will have to be a template function instead. I don't plan to do that, but I'm mentioning it now in case reviewers would prefer that we use a no-arg function (i.e. `{onelinesummary()}`) already today to prepare for that. Differential Revision: https://phab.mercurial-scm.org/D9314

relnotes: document new [command-templates] section Differential Revision: https://phab.mercurial-scm.org/D9266

help: document the new [command-templates] config section Differential Revision: https://phab.mercurial-scm.org/D9265

strip: move into core As discussed at the 5.2 sprint, replace strip extension by a core command, debugstrip. Obviously, the extension stays for backwards compatibility. As an implementation note, I moved the strip file as is into core, which is not done elsewhere, AFAIK. I could have inlined it into debugcommands, but that doesn't sound great. Differential Revision: https://phab.mercurial-scm.org/D9285

revlog: pass sidedata argument to flagutil.processflagswrite() Bug found through pytype. Differential Revision: https://phab.mercurial-scm.org/D9280