remotenames: use util.always instead of handcrafted lambda

remotenames: inline _parseargs() into _revsetutil() The _parseargs() function gets quite simple, and the 0/1 loop can be rewritten as "if".

repo: create changectx in a single place in localrepo.__getitem__ Differential Revision: https://phab.mercurial-scm.org/D4885

repo: remove the last few "pass" statements in localrepo.__getitem__ In case of IndexError or LookupError, we used "pass" statements and fell through to the end of localrepo.__getitem__. I find the pass statements easy to miss. Consistently raising and catching exceptions seems easier to follow. Oh -- and I didn't plan this before I wrote the above -- that probably also lets us reuse the "return context.changectx(self, rev, node)" in a later patch. Differential Revision: https://phab.mercurial-scm.org/D4884

filectx: correct docstring about "changeid" The changeid argument must be a revnum (basefile.rev() is defined as "return self._changeid"), so fix the lie in the docstring. It seems to have been incorrect for at least 10 years (I didn't check further back). Differential Revision: https://phab.mercurial-scm.org/D4881

context: drop incorrect and superfluous docstring It's been incorrect at least since 8b86acc7aa64 (context: drop support for looking up context by ambiguous changeid (API), 2018-04-28). Differential Revision: https://phab.mercurial-scm.org/D4880

remotenames: follow-up on D3639 to make revset funcs take only one arg Per the review discussion on D3639, we want this to just take one argument. That ended up simplifying the code, so I'm sharing this as a follow-up to that revision rather than editing in-flight.

remotenames: add names argument to remotenames revset This patch adds names argument to the revsets provided by the remotenames extension. The revsets are remotenames(), remotebranches() and remotebookmarks(). names can be a single names, list of names or can be empty too which means it's an optional argument. If names is/are passed, changesets which have those remotenames will be returned. If names are not passed, changesets from all the remotenames are shown. Passing an invalid remotename does not throw error. The name argument also supports pattern matching. Tests are added for the argument in tests/test-logexchange.t Differential Revision: https://phab.mercurial-scm.org/D3639

copies: add time information to the debug information

copies: add a devel debug mode to trace what copy tracing does Mercurial can spend a lot of time finding renames between two commits. Having more information about that process help to understand what makes it slow in an individual instance. (eg: many files vs 1 file, etc...)