sshpeer: rename _recv and _send to _readframed and _writeframed Because it is reading and writing a chunk of data with a well-defined size. "recv" and "send" make it sound like things are a direct proxy to the underlying pipe, which they aren't. Differential Revision: https://phab.mercurial-scm.org/D2378

util: add a file object proxy that can read at most N bytes Sometimes we have data of a known size within a stream. For performance reasons, we don't want to pre-read this data (we want to allow consumers to read on demand). For simplicitly reasons, we don't want callers to necessarily know their data is coming from within an outer stream and there is a limit to how much they should read. The class introduced by this commit provides a very simple proxy around an underlying file object that allows the consumer to .read() up to N bytes from the file object. Attempts to read past this many bytes results in a simulated EOF. Differential Revision: https://phab.mercurial-scm.org/D2377

patches: release the GIL while applying the patch This will allow multiple threads to apply patches at the same time.

perfbranchmap: allow to select the filter to benchmark Running the branchmap computation on all filter levels can be expensive. Narrowing the run to some specific filters can speed up benchmarking time when working only on a subset of filter levels.

perfbranchmap: display 'unfiltered' for unfiltered performance This is slightly clearer than "None" and will help with coming changes to select the filter level we want timing for.

py3: two more narrow tests passing Differential Revision: https://phab.mercurial-scm.org/D2390

narrowbundle2: more kwargs native string fixes This gets test-narrow.t to *almost* pass. Something appears to be borked in producing bundles, but only some of the time? I'm lost, but this change is at least a clear improvement. # skip-blame just more r prefixes on strings Differential Revision: https://phab.mercurial-scm.org/D2389

py3: whitelist another 11 passing tests This is most of narrow. There's still some buglets at the margins, but it's pretty good progress for not a lot of work. Differential Revision: https://phab.mercurial-scm.org/D2388

narrowbundle2: use native string to get kwargs from dict # skip-blame just some r prefixes on strings Differential Revision: https://phab.mercurial-scm.org/D2387

narrowbundle2: drop legacy getcgkwargs variable I think this was around as part of support for some older hg internals. It's not needed any more. Differential Revision: https://phab.mercurial-scm.org/D2386

fancyopts: add support for custom multi-arg opts in fancyopts.py This allows for more complex multi-arg opt logic, such as "--sum 1 --sum 2" -> 3, "--csv alice,bob --csv charlie" -> ["alice","bob","charlie"]. The current support for callables is insufficient for this. This is done by introducing a 'customopt' class which can be extended for more powerful opts logic. All existing opt-types are converted to use this class, simplifying the fancyopts() logic. Differential Revision: https://phab.mercurial-scm.org/D2090

narrowcommands: add some missing strkwargs calls for py3 # skip-blame because it's just r prefixes Differential Revision: https://phab.mercurial-scm.org/D2367