profile: introduce a knob to control if the context is actually profiling This is a step toward allowing context where the profiling in enabled withing the context range. This also open the way to kill the dedicated "maybeprofile" context manager and keep only one of 'profile' and 'maybeprofile'.

profile: introduce a "start" method to the profile context The start method is doing all profiler setup and activation. It is currently unconditionally called by '__init__' but this will be made more flexible in later changesets.

profile: upgrade the "profile" context manager to a full class So far we have been able to use a simple decorator for this. However using the current context manager makes the scope of the profiling in dispatch constrainted and the time frame to decide to enable profiling quite limited (using "maybeprofile") This is the first step toward the ability to enable the profiling from within the profiling scope. eg:: with maybeprofiling(ui) as profiler: ... bar.foo(): ... if options['profile']: profiler.start() ... fooz() ... My target usecase is adding support for "--profile" to alias definitions with effect. These are to be used with "profiling.output=blackbox" to gather data about operation that get slow from time to time (eg: pull being minutes instead of seconds from time to time). Of course, in such case, the scope of the profiling would be smaller since profiler would be started after running extensions 'reposetup' (and other potentially costly logic), but these are not relevant for my target usecase (multiple second commits, multiple tens of seconds pull). Currently adding '--profile' to a command through alias requires to re-spin a Mercurial binary (using "!$HG" in alias), which as a significant performance impact, especially in context where startup performance is being worked on... An alternative approach would be to stop using the context manager in dispatch and move back to a try/finally setup.

setup: avoid linker warnings on Windows about multiple export specifications The PyMODINIT_FUNC macro contains __declspec(dllexport), and then the build process adds an "/EXPORT func" to the command line. The 64-bit linker flags this [1]. Everything except zstd.c and bser.c are covered by redefining the macro in util.h [2]. These modules aren't built with util.h in the #include path, so the redefining hack would have to be open coded two more times. After seeing that extra_linker_flags didn't work, I couldn't find anything authoritative indicating why, though I did see an offhand comment on SO that CFLAGS is also ignored on Windows. I also don't fully understand the interaction between msvccompiler and msvc9compiler- I first subclassed the latter, but it isn't used when building with VS2008. I know the camelcase naming isn't the standard, but the HackedMingw32CCompiler class above it was introduced 5 years ago (and I think the current style was in place by then), so I assume that there's some reason for it. [1] https://support.microsoft.com/en-us/help/835326/you-receive-an-lnk4197-error-in-the-64-bit-version-of-the-visual-c-compiler [2] https://bugs.python.org/issue9709#msg120859

memctx: always use cache for filectxfn I don't see a downside to doing this unless I'm missing something. Thanks to foozy for correcting my previous bad logic.

test-hardlinks: stabilize for Windows This broke in c2cb0de25120, which breaks hardlinks when the executable bit is toggled.

releasenotes: add more tests for formatting and merging of release notes

releasenotes: command to manage release notes files Per discussion on the mailing list, we want better release notes for Mercurial. This patch introduces an extension that provides a command for producing release notes files. Functionality is implemented as an extension because it could be useful outside of the Mercurial project and because there is some code (like rst parsing) that already exists in Mercurial and it doesn't make sense to reinvent the wheel. The general idea with the extension is that changeset authors declare release notes in commit messages using rst directives. Periodically (such as at publishing or release time), a project maintainer runs `hg releasenotes` to extract release notes fragments from commit messages and format them to an auto-generated release notes file. More details are explained inline in docstrings. There are several things that need addressed before this is ready for prime time: * Moar tests * Interactive merge mode * Implement similarity detection for individual notes items * Support customizing section names/titles * Parsing improvements for bullet lists and paragraphs * Document which rst primitives can be parsed * Retain arbitrary content (e.g. header section/paragraphs) from existing release notes file * Better error messages (line numbers, hints, etc)

packagelib: use LANGUAGE=C for "hg version" If "hg version" does not contain "version" (e.g. Japanese), $hgversion was empty and rpmbuild failed.

rpms: add hgdemandimport in files

rpms: remove '%if "%{?pythonver}" != "2.4"' Mercurial requires python >= 2.7.

obsstore: do not load all markers to detect duplication This will make duplication detection something like O(newmarkers) instead of O(obsstore).

clonebundles: reference correct config option This option is no longer experimental.

filestat: move __init__ to frompath constructor We're going to add a `fromfp` constructor soon, and this also allows a filestat object for a non-existent file to be created.

test-dirstate-race: ensure that a isn't in the lookup set at the end We're going to rely on this in upcoming patches.

hghave: add test for whether fsmonitor is enabled This uses the HGFSMONITOR_TESTS environment variable that fsmonitor-run-tests.py adds.

tests: add a wrapper to run fsmonitor tests This script does a bunch of non-trivial configuration work: in particular, it sets up an isolated instance of Watchman which isn't affected by global state and can be torn down on completion. This script also sets the HGFSMONITOR_TESTS environment variable, which hghave will use in the next patch to allow gating on whether fsmonitor is enabled. With fsmonitor enabled, there appear to be a number of failures in the test suite. It's not yet clear to me why they're happening, but if someone would like to jump in and fix some of them I hope this will be helpful for that.

setdiscovery: improves logged message The 'srvheads' list contains all server heads including the common ones. We adjust 'ui.log' message to provide more useful information about server heads locally unknown. The performance impact of turning the list to set is negligible (about 1e-4s) compared to the rest of the discovery cost, so I'm taking the easy path.

tests: handle variation between pure and normal output in annotate --skip I'm pretty sure that both results are valid, depending on how you slice the edits.

bisect: improve option validation message

context: inline makememctx (API) I have always thought it weird that we have a helper method instead of just using __init__. So, I ripped it out.

context: add convenience method for returning a memfilectx from a patch This is mostly a copy of what makememctx does but refactored to make it behave more like our other convenience methods.

memctx: refactor inline getfilectx into convenience method No actual logic is changing, just moving code so __init__ is easier to read.

hgweb: refresh styling of gitweb's search form gitweb was missing the hint hover box. So that was added. Also, the positioning of the form was absolute and it didn't vertically align on all pages. The element has been moved inline with the navigation links (which now are contained in a div) and flexbox is used to obtain sane alignment of the navigation links and search form. For those new to flexbox, "justify-content: space-between" basically says to maximize space elements. You can use it to easily get left and right justified containers without having to worry about width, floating, etc. "align-items: center" centers all items in a cross-axis. I've literally wasted hours trying to figure out both these problems before flexbox. Flexbox is amazing. Flexbox has been supported by Chrome and Firefox for a few years. But it is only supported by IE 11. I'm willing to wager that people using this either won't be using IE or will be using IE 11. So I'm willing to be a bit aggressive in adopting flexbox because it makes CSS alignment so much easier.

hgweb: consistently add search form to all gitweb pages Paper has it on all pages. Not sure why gitweb doesn't. I think it should be everywhere because it is a useful feature. Also, we weren't consistently adding the HTML in the same place. This was OK since the element is absolutely positioned. But this bothered me a bit, so I went ahead and fixed it.

hgweb: consolidate search form for gitweb

hgweb: consolidate search form for monoblue Same deal as for paper.

hgweb: consolidate search form for paper AFAICT this was mostly a bunch of copy pasta. The only variation is some pages defined a "value" attribute. The "query" variable will just be empty on pages that don't accept it. So let's consolidate the template and remove the redundancy.

test-extension: fix load path for Windows The previous code was trying to load the extension from /tmp/hgtests.xxx/..., but the actual path for tests is C:\Users\...\Temp\hgtests.xxx\... I assume that the former is an MSYS path that maps somewhere under C:\MinGW.

test-setdiscovery: stabilize for Windows Windows wants double quotes here.