python3: allow hgloader to work with lazy loaders Don't clobber the loader returned from find_spec. This brings `hg version` down from 0.27 seconds to 0.17.

init: turn on demandimport for Python 3.6 and above This uses the new demandimport implementation for Python 3 introduced in previous patches. This doesn't yet enhance performance because it isn't integrated with the custom source file loader we use on Python 3. We'll integrate the two in upcoming patches.

demandimport: add python 3 implementation This implementation uses the new importlib finder/loader functionality available in Python 3.5 and up. # no-check-commit

demandimport: move ignore list to __init__.py We're going to use the same ignore list for Python 3.

check: check modules in hgdemandimport A few places only check modules in mercurial and hgext. Add hgdemandimport to the list in those places.

demandimport: move to separate package In Python 3, demand loading is per-package. Keeping demandimport in the mercurial package would disable demand loading for any modules in mercurial.

import-checker: add a way to directly import certain symbols We'll use this for the 'demandimport' symbol in an upcoming patch.

check-code: allow skipping hasattr check in py3-only code hasattr is safe in Python 3, and in an upcoming patch we can't use util.safehasattr.

profiling: allow loading profiling extension before everything else 6d642ecf1a89 makes profiler start early without loading extensions. That makes it impossible for an extension to add customized profilers. This patch adds a special case: if a profiler is not found but an extension with the same name could be loaded, load that extension first, and expect it to have a "profile" contextmanager method. This allows customized profilers and extension setup time is still profiled.

extensions: allow loading a whitelisted subset of extensions This feature will be used by the next patch.

match: catch attempts to create case-insenstive exact matchers Exact matchers are only created internally (as opposed to from user input) based on a set of files that the caller collected before, so they should always match the list exactly (i.e. case-sensitively).

test: remove aliases forcing date, use default-date Now that we have the default-date by default and all code have been updated, remove the old commands alias that forced the date as they are not longer useful. Writing tests now should be easier for everyone now that all dates should be stable.

test: prepare tests for removing date aliases In the next patch, I'm gonna removing the global command aliases that force the epoch date but some tests either fail or their output change after that. Instead I'm copying the needed aliases in the test files that will otherwise change. Update test-rebase-obsolete.t because a revision hash is based on the epoch date after a 'commit --amend' and the output will change after removing date aliases. Update test-subrepo-git.t as the git subrepo doesn't use traditional date mechanisms. I'm not sure that updating the git subrepo to support default-date make sense. Add the commit alias to the test in order for making it pass after removing the date aliases globally.

devel: update blackbox to use default-date Blackbox now obeys the 'devel.default-date' option. As a side effect we can delete the mock for blackblox related tests.

devel: use default-date config field when creating obsmarkers Also use the default-date when creating obsmarkers. Currently they are created with the current date and without any option to force their value. To test the feature, we remove some of the many 'glob' used to match obsmarker date in the tests.

devel: activate default-date in tests It will make writing future tests more easier for everyone as we won't need to glob dates anymore in tests.

devel: add a config field to force dates to timestamp 0 Add a new config field named default-date under the devel section to force all implicits date to a specific value. If a explicit date is passed, it will override the default. This patch only affect changesets. Other usages (blackbox, obsmarkers) are updated in later patchs. The test runner is setting a bunch of alias to force the '--date' argument. We will replace theses aliases in a later patch.

ui: add the possiblity to get a date config field Add the method configdate to read a date from configuration. It uses the util.rawparsedate refactored earlier to support all standard date formats.

util: refactor util.parsedate to raises ValueError Split most of util.parsedate in util.rawparsedate and make it raises ValueError instead of error.Abort. The util.parsedate function is now just a shell function converting ValueError to error.Abort for existing users. I need to parse a date from config in a later patch and use util.rawparsedate with ui.configwith which expect a convert that raises ValueError.

match: implement __repr__() and update users (API) fsmonitor and debugignore currently access matcher fields that I would consider implementation details, namely patternspat, includepat, and excludepat. Let' instead implement __repr__() and have the few users use that instead. Marked (API) because the fields can now be None.

fsmonitor: fix silly "*kwargs" bug in merge.update() override Everyone knows that it's supposed to be spelled with two asterisks. It started failing in fad5e299cfc7 (update: accept --merge to allow merging across topo branches (issue5125), 2017-02-13) because until then there was only one argument that was covered by the kwargs, so *kwargs or **kwargs both worked (or at least that's what I think with my limited understanding of Python).

revset: make `hg log -r 'wdir()^'` work (issue4905) This patch catches the WdirUnsupported exception to support wdir()^.

revlog: raise WdirUnsupported when wdirrev is passed revlog.parentrevs() is called while evaluating ^ operator in revsets. When wdir is passed, it raises IndexError. This patch raises WdirUnsupported if wdir is passed in the function. The error will be caugth in future patches.

error: add a new exception named WdirUnsupported This series intents to support wdir() predicate with different operators like ~, ^. Currently the storage class don't support wdir(). This exception is introduced so that it can be raised from places where wdir() is passed and is not supported and we can catch this where we want to support the predicate. Also throwing an error at low level and catching at some higher level is better than using if-else especially for perf.

match: replace icasefsmatch() function by flag to regular match() match() will soon gain more logic and we don't want to duplicate that in icasefsmatch(), so merge the two functions instead and use a flag to get case-insensitive behavior.

match: delete icasefsmatcher now that it's same as matcher

match: pass in normalize() function to matchers This will let us delete icasefsmatcher.

match: don't print explicitly listed files with wrong case (BC) On case-insensitive file systems, if file A exists and you try to remove it (or add, etc.) by specifying a different case, you will see something like this: $ hg rm a removing file A I honestly found this surprising because it seems to me like it was explicitly listed by the user. Still, there is a comment in the code describing it, so it is very clearly intentional. The code was added in baa11dde8c0e (match: add a subclass for dirstate normalizing of the matched patterns, 2015-04-12). I'm going to do a lot of refactoring to matchers and the feature mentioned above is going to get in my way. I'm therefore removing it for the time being and we can hopefully add it back when I'm done.

match: move body of _normalize() to a static function matcher._normalize() no longer depends on any of the matcher's state, and making it static will enable further refactoring. Note that the subdirmatcher subclass calls _normalize(), so we can't remove it completely.

match: pass 'warn' argument to _normalize() for consistency No other arguments are passed via the matcher's state, so we should treat 'warn' the consistently. More importantly, this will let us make it a static function, which will help with further refactoring.