test-debugextensions: add dummy extension to make ifcontains() test more solid If testedwith were a string, ifcontains("3.2", testedwith) would match "3.2.1". New test added to cover that.

py3: remove use of *L syntax The int in Python 3 behaves as long so no need of L's in py3. Moreover we dont need long here.

util: rename checkcase() to fscasesensitive() (API) I always read the name "checkcase(path)" as "do we need to check for case folding at this path", but it's actually (I think) meant to be read "check if the file system cares about case at this path". I'm clearly not the only one confused by this as the dirstate has this property: def _checkcase(self): return not util.checkcase(self._join('.hg')) Maybe we should even inverse the function and call it fscasefolding() since that's what all callers care about?

manifest: call m1.load and m2.load before writing a subtree As part of refactoring the manifest, certain test cases started failing because writesubtrees was called with p1 and p2 manifests that had not been loaded (so accessing m1._dirs resulted in an empty set). Let's call _load on these before attempting to access _dirs. This was caught by tests when future patches were applied.

histedit: correct output of error when 'base' is from the edit list This was made more obvious by marmoute's recent rearrangement of this code.

py3: split check of pygments-using files from the rest of the tree If we don't do this, people without pygments installed in their Python 3 environment silently stop checking test-check-py3-compat, which isn't really what we wanted. This preserves stability of the test output while still letting anyone with a recent-enough Python 3 run the majority of the Python 3 compat checking test.

version: change "place" field of extension to "bundled" flag The name "place" sounds odd. We can simply expose raw boolean values instead of switching external/internal literals.

extensions: use ismoduleinternal() thoroughly "ships-with-hg-core" would be long enough to typo.

lock: show more detail for new-style locks in lock waiting message (issue4752) Improve the lock waiting warning message by explicitly saying that a host and process are holding the lock. This nudges confused new users in the direction of investigating the other process instead of removing the lock.

formatter: add context manager interface for convenience And port "hg files" to test it. As you can see, extra indent is necessary to port to this API. I don't think we should switch every fm.formatter() call to "with" statement.

histedit: remove now unused 'constraints' related code Now that the one action that need different logic handle that using inheritance and overriding, we can remove that code.

histedt: use inheritance to override the constraints in 'base' All actions but one actually have the same constraints when it comes to validate the 'action.node' value. So we actually just add this code to a method that can be overwritten in the one action where it matters. The now unused 'contraints' related enum and class attribute will be cleaned up in the next changeset.

histedit: move constraint verification to the 'action.verify' method Action has a method dedicated to verifying its validity. So we move code related to constrains into that method. This requires a bit more context to the 'verify' method in the same fashion we were passing the 'prev' argument. This is an extra step before we can simplify the constraint handling code further.

histedit: directly use node in 'verifyactions' It does not seem useful to convert to hex: it is an extra step and they are longer strings. So we stick to node for the logic. We only convert to short hex for error when needed. As a nice side effect this remove the explicit constant usage in'[12:]'. This will also help moving the code around later as we just have to access action.node.

histedit: temporarily shorten name of 'constraints' variable An upcoming changeset will make the line where this variable is used slightly too long. Other later changesets will clean that up further and makes the variable unnecessary, so this is only temporary and it does seems useful to put anything more complicate in place.

histedit: drop the 'nodetoverify' local variable We can just use 'action.node'.

histedit: make 'constraints' a class attribute instead of a method There does not seem to be a reason for this to be a method. So we initialise the class attribute once and for all at creation time and drop the instance method.

histedit: drop the 'nodetoverify' method That method is just returning self.node and is never overridden. We just use the attribute directly instead and get rid of the method. This is the beginning of series to simplify and unify verification of constraints for actions.

test-gpg: start gpg-agent by gpg-connect-agent only if GnuPG v2.1+ detected Danek Duvall found that gpg-connect-agent of GnuPG 2.0 never starts gpg-agent daemon. The 2.1 way is documented as "gpg-coonect-agent /bye" [1], which appears to be different from the 2.0 way [2]. [1]: https://www.gnupg.org/documentation/manuals/gnupg/Invoking-GPG_002dAGENT.html [2]: https://www.gnupg.org/documentation/manuals/gnupg-2.0/Invoking-GPG_002dAGENT.html Since "gpg-agent --daemon" of GnuPG 2.1 never prints environment variables, "eval $(gpg-agent --daemon)" would be valid only for GnuPG < 2.1, and we'll need a different workaround for 2.0. I have no 2.0 environment, I won't implement it.

rebase: properly calculate total commits to rebase (issue5347) Before this, predecessor commits were being included in the count

mpatch: add setup_mpatch_cffi.py This file got dropped when the corresponding setup.py changes were made.

journal: rename on disk files to 'namejournal' The 'journal' naming is already used by the transaction journal. Having an unrelated group of file with such a close naming is confusing and error prone. We rename the file used by the 'journal' extension to use 'namejournal' as the extension track the location of various 'names'.

tests: guard demandimport segment of test-extension.t

tests: skip demandimport if disabled demandimport and setuptools and decorator (from ironpython) and pygments leads to lots of fail. If demandimport is disabled we should skip testing it...

hghave: add demandimport checking

hghave: make bzr checks stricter My bzr does not have bzrlib.revisionspec.RevisionSpec, and thus tests were failing because convert refused to believe in bzr, but hghave without this change thought it was available.

help: document wire protocol commands

help: document wire protocol "handshake" protocol There isn't a formal handshake protocol in the wire protocol. But clients almost certainly need to perform particular actions before they can communicate with a server optimally. So document what that is so people understand what's going on at connection establishment time.

help: document wire protocol capabilities All capabilities from the history of the project are now documented.

crecord: properly handle files with No newline at eof (issue5268) Yes, this bug was a single character with the wrong case...

annotate: pre-calculate the "needed" dictionary (issue5360) The "needed" dict is used as a reference counter to free items in the giant "hist" dict. However, currently it is not very accurate and can lead to dropping "hist" items unnecessarily, for example, with the following DAG, -3- / \ 0--1--2--4-- The current algorithm will visit and calculate rev 1 twice, undesired. And it tries to be smart by clearing rev 1's parents: "pcache[1] = []" at the time hist[1] being accessed (note: hist[1] needs to be used twice, by rev 2 and rev 3). It can result in incorrect results if p1 of rev 4 deletes chunks belonging to rev 0. However, simply removing "needed" is not okay, because it will consume 10x memory: # without any change % HGRCPATH= lrun ./hg annotate mercurial/commands.py -r d130a38 3>&2 [1] MEMORY 49074176 CPUTIME 9.213 REALTIME 9.270 # with "needed" removed MEMORY 637673472 CPUTIME 8.164 REALTIME 8.249 This patch moves "needed" (and "pcache") calculation to a separate DFS to address the issue. It improves perf and fixes issue5360 by correctly reusing hist, while maintaining low memory usage. Some additional attempt has been made to further reduce memory usage, like changing "pcache[f] = []" to "del pcache[f]". Therefore the result can be both faster and lower memory usage: # with this patch applied MEMORY 47575040 CPUTIME 7.870 REALTIME 7.926 [1]: lrun is a lightweight sandbox built on Linux cgroup and namespace. It's used to measure CPU and memory usage here. Source code is available at github.com/quark-zju/lrun.

help: document wire protocol transport protocols The HTTP and SSH transport protocols are documented. This includes how commands and arguments are serialized as well as response types.

help: internals topic for wire protocol The Mercurial wire protocol is under-documented. This includes a lack of source docstrings and comments as well as pages on the official wiki. This patch adds the beginnings of "internals" documentation on the wire protocol. The documentation should have nearly complete coverage on the lower-level parts of the protocol, such as the different transport mechanims, how commands and arguments are sent, capabilities, and, of course, the commands themselves. As part of writing this documentation, I discovered a number of deficiencies in the protocol and bugs in the implementation. I've started sending patches for some of the issues. I hope to send a lot more. This patch starts with the scaffolding for a new internals page.

grep: add formatter support Several fields are renamed to be consistent with the annotate command, which doesn't mean the last call for the name unification [1]. Actually, I'd rather rename line_number to linenumber, linenum, lineno or line, but I want to port the grep command to formatter first. [1]: https://www.mercurial-scm.org/wiki/GenericTemplatingPlan#Dictionary I don't have any better name for the list of matched/unmatched texts, so they are just called as "texts".

grep: build list of all columns regardless of display options These columns should always be available in JSON or template outputs. The "change" column is excluded because it has no useful data unless --all is specified.

grep: build list of columns without "grep." label prefix Prepares for formatter support. We need field names without "grep.".

grep: factor out function that prints matched line with labels Prepares for formatter support.

grep: refactor loop that yields matched text with label As preparation for formatter support, this and the next patch split linestate.__iter__() into two functions, line scanner and displayer. New code uses regexp.search(str, pos) in place of regexp.search(substr), which appears to fix a bug of highlighting.

Added signature for changeset ccd436f7db6d

Added tag 3.9.1 for changeset ccd436f7db6d

bundle2: localize handleoutput remote prompts Code archaeology suggests that there was no good reason for this not to be localized. 'remote: ' is already localized elsewhere.

i18n-pt_BR: synchronized with a12d13eac513

files: change documentation to match its behaviour (issue5276) Documentation gave the usage pattern as '[OPTION]... [PATTERN]...' when the command match given files as relpaths by default.

templater: add template path to __base__ search This does a fall-back check for style files or directories that are in Mercurial's template path for user convenience. We intentionally don't use this for the built-in coal style because we don't want the style to mysteriously break if the working directory just happens to have a file named "paper".

bundle2: fail faster when interrupted Before this patch, bundle2 application attempted to consume remaining bundle2 part data when the process is interrupted (SIGINT) or when sys.exit is called (translated into a SystemExit exception). This meant that if one of these occurred when applying a say 1 GB changegroup bundle2 part being downloaded over a network, it may take Mercurial *several minutes* to terminate after a SIGINT because the process is waiting on the network to stream megabytes of data. This is not a great user experience and a regression from bundle1. Furthermore, many process supervisors tend to only give processes a finite amount of time to exit after delivering SIGINT: if processes take too long to self-terminate, a SIGKILL is issued and Mercurial has no opportunity to clean up. This would mean orphaned locks and transactions. Not good. This patch changes the bundle2 application behavior to fail faster when an interrupt or system exit is requested. It does so by not catching BaseException (which includes KeyboardInterrupt and SystemExit) and by explicitly checking for these conditions in yet another handler which would also seek to the end of the current bundle2 part on failure. The end result of this patch is that SIGINT is now reacted to significantly faster: the active transaction is rolled back immediately without waiting for incoming bundle2 data to be consumed. This restores the pre-bundle2 behavior and makes Mercurial treat signals with the urgency they deserve.

blackbox: also log alias expansions This should be extremely useful for helping users debug without having to see their complete configuration. Shell aliases do not get their expansion logged, because we don't look and see if we're in a repo before we dive into the execution of a shell alias. As a result, the ui object doesn't know where to log.

test-clonebundles: accept another error string here This is what happens if you run the test in a FreeBSD Jail, rather than "connection refused".

tests: guard test-archive-symlink with unziplinks check This fixes the test on FreeBSD, where the stock unzip doesn't understand symlinks.

hghave: add a check for unzip(1) that understands symlinks unzip(1) from the FreeBSD base system does not understand symlinks, so test-archive-symlinks is busted.

test-https: drop two spurious --traceback flags These make test failures scarier than they are.

extensions: change magic "shipped with hg" string I've caught multiple extensions in the wild lying about being 'internal', so it's time to move the goalposts on people. Goalpost moving will continue until third party extensions stop trying to defeat the system.

version: add formatter support The license message isn't exported, which I don't think is useful and I couldn't find a way to restructure it for JSON or template outputs.

version: factor out mapping of internal/external labels Prepares for formatter support, where translation should be disabled conditionally.

version: always build list of extension versions This patch just moves "if ui.verbose:" to the inner loop, as preparation for formatter support.

formatter: add fm.nested(field) to either write or build sub items We sometimes need to build nested items by formatter, but there was no convenient way other than building and putting them manually by fm.data(): exts = [] for n, v in extensions: fm.plain('%s %s\n' % (n, v)) exts.append({'name': n, 'ver': v}) fm.data(extensions=exts) This should work for simple cases, but doing this would make it harder to change the underlying data type for better templating support. So this patch provides fm.nested(field), which returns new nested formatter (or self if items aren't structured and just written to ui.) A nested formatter stores items which will later be rendered by the parent formatter. fn = fm.nested('extensions') for n, v in extensions: fn.startitem() fn.write('name ver', '%s %s\n', n, v) fn.end() Nested items are directly exported to a template for now: {extensions % "{name} {ver}\n"} There's no {extensions} nor {join(extensions, sep)} yet. I have a plan for them by extending fm.nested() API, but I want to revisit it after trying out this API in the real world.

formatter: factor out format*() functions to separate classes New converter classes will be reused by a nested formatter. See the next patch for details. This change is also good in that the default values are defined uniquely by the baseformatter.

crecord: restore SIGWINCH handler before return Previously, the SIGWINCH handler does not get cleared and if the commit message editor also needs SIGWINCH handling (like vim), the two SIGWINCH handlers (the editor's, ours) will have a race. And we may erase the editor's screen content. This patch restores SIGWINCH handler to address the above issue.

bdiff: implement cffi version of bdiff

bdiff: implement cffi version of blocks

util: checknlink should remove file it creates if an exception occurs There's no reason to leave the file behind.

merge: remove files with extra actions from merge action list See the comment for a detailed explanation why. Even though this is a bug, I've sent it to 'default' rather than 'stable' because it isn't triggered in any code paths in stock Mercurial, just with the merge driver included. For the same reason I haven't included any tests here -- the merge driver is getting a new test.

revlog: use an LRU cache for delta chain bases Profiling using statprof revealed a hotspot during changegroup application calculating delta chain bases on generaldelta repos. Essentially, revlog._addrevision() was performing a lot of redundant work tracing the delta chain as part of determining when the chain distance was acceptable. This was most pronounced when adding revisions to manifests, which can have delta chains thousands of revisions long. There was a delta chain base cache on revlogs before, but it only captured a single revision. This was acceptable before generaldelta, when _addrevision would build deltas from the previous revision and thus we'd pretty much guarantee a cache hit when resolving the delta chain base on a subsequent _addrevision call. However, it isn't suitable for generaldelta because parent revisions aren't necessarily the last processed revision. This patch converts the delta chain base cache to an LRU dict cache. The cache can hold multiple entries, so generaldelta repos have a higher chance of getting a cache hit. The impact of this change when processing changegroup additions is significant. On a generaldelta conversion of the "mozilla-unified" repo (which contains heads of the main Firefox repositories in chronological order - this means there are lots of transitions between heads in revlog order), this change has the following impact when performing an `hg unbundle` of an uncompressed bundle of the repo: before: 5:42 CPU time after: 4:34 CPU time Most of this time is saved when applying the changelog and manifest revlogs: before: 2:30 CPU time after: 1:17 CPU time That nearly a 50% reduction in CPU time applying changesets and manifests! Applying a gzipped bundle of the same repo (effectively simulating a `hg clone` over HTTP) showed a similar speedup: before: 5:53 CPU time after: 4:46 CPU time Wall time improvements were basically the same as CPU time. I didn't measure explicitly, but it feels like most of the time is saved when processing manifests. This makes sense, as large manifests tend to have very long delta chains and thus benefit the most from this cache. So, this change effectively makes changegroup application (which is used by `hg unbundle`, `hg clone`, `hg pull`, `hg unshelve`, and various other commands) significantly faster when delta chains are long (which can happen on repos with large numbers of files and thus large manifests). In theory, this change can result in more memory utilization. However, we're caching a dict of ints. At most we have 200 ints + Python object overhead per revlog. And, the cache is really only populated when performing read-heavy operations, such as adding changegroups or scanning an individual revlog. For memory bloat to be an issue, we'd need to scan/read several revisions from several revlogs all while having active references to several revlogs. I don't think there are many operations that do this, so I don't think memory bloat from the cache will be an issue.

revlog: remove unused variables

util: properly implement lrucachedict.get() Before, it was returning the raw _lrucachenode instance instead of its value.

manifest: change changectx to access manifest via manifestlog This is the first place where we'll start using manifestctx instances instead of manifestdict. This will facilitate using different manifestctx implementations in the future.

manifest: use property instead of field for manifest revlog storage The file caches we're using to avoid reloading the manifest from disk everytime has an annoying bug that causes the in memory structure to not be reloaded if the mtime and the size haven't changed. This causes a breakage in the tests because the manifestlog is not being reloaded after a commit+strip operation in mq (the mtime is the same because it all happens in the same second, and the resulting size is the same because we add 1 and remove 1). The only reason this doesn't affect the manifest itself is because we touch it so often that we had already reloaded it after the commit, but before the strip. Once the entire manifest has migrated to manifestlog, we can get rid of these properties, since then the manifestlog will be touched after the commit, but before the strip, as well.

manifest: introduce manifestlog and manifestctx classes This is the start of a large refactoring of the manifest class. It introduces the new manifestlog and manifestctx classes which will represent the collection of all manifests and individual instances, respectively. Future patches will begin to convert usages of repo.manifest to repo.manifestlog, adding the necessary functionality to manifestlog and instance as they are needed.

manifest: make manifest derive from manifestrevlog As part of our refactoring to split the manifest concept from its storage, we need to start moving the revlog specific parts of the manifest implementation to a new class. This patch creates manifestrevlog and moves the fulltextcache onto the base class.

manifest: break mancache into two caches The old manifest cache cached both the inmemory representation and the raw text. As part of the manifest refactor we want to separate the storage format from the in memory representation, so let's split this cache into two caches. This will let other manifest implementations participate in the in memory cache, while allowing the revlog based implementations to still depend on the full text caching where necessary.

dispatch: explicitly pass fancyopts optional arg as a keyword I've been baffled by this a couple of times (mainly wondering if any callers of fancyopts.fancyopts that don't use gnu=True exist), so let's just specify this as a keyword argument to preserve sanity.

osutil: fix the bug on OS X when we return more in listdir The pointer arithmetic somehow got ommitted during the recent change to use a struct.

histedit: use samefile function from cmdutil Replace usage of inefficient samefile function in collapse with a call to cmdutil.samefile().

cmdutil: extract samefile function from amend()

templater: rename "right" argument of pad() function Before, right=True meant right justify, which I think is left padding.

templater: make pad() evaluate boolean argument (BC) Otherwise it would crash if template expression was passed. This patch unifies the way how boolean expression is evaluated, which involves BC. Before "if(true)" and "pad(..., 'false')" were False, which are now True since they are boolean literal and non-empty string respectively. "func is runsymbol" is the same hack as evalstringliteral(), which is needed for label() to take color literals.

templater: fix if() to not evaluate False as bool('False') Before, False was True. This patch fixes the issue by processing True/False transparently. The other values (including integer 0) are tested as strings for backward compatibility, which means "if(latesttagdistance)" never be False. Should we change the behavior of "if(0)" as well?

templater: make it clearer that _flatten() omits None

revset: support "follow(renamed.py, e22f4f3f06c3)" (issue5334) v2: fixes from review

coal: use inheritance to derive from paper This illustrates how much simpler this approach is, in particular the effect of map-relative paths.

templater: add inheritance support to style maps We can now specify a base map file: __base__ = path/to/map/file That map file will be read and used to populate unset elements of the current map. Unlike using %include, elements in the inherited class will be read relative to that path. This makes it much easier to make custom local tweaks to a style.

killdaemons: prevent killing all user processes by bad pid file When I was fixing the test-gpg issue, I noticed gpg-connect-agent could print "-1" as a server pid if command was wrong. I'm not pretty sure but nobody would want to kill their running applications by mistake.

py3: automatically glob out line numbers from check-py3-compat output It was boring task to update the result manually.

py3: have check-py3-compat require pygments to get stable result

computeoutgoing: move the function from 'changegroup' to 'exchange' Now that all users are in exchange, we can safely move the code in the 'exchange' module. This function is really about processing the argument of a 'getbundle' call, so it even makes senses to do so.

getchangegroup: take an 'outgoing' object as argument (API) There is various version of this function that differ mostly by the way they define the bundled set. The flexibility is now available in the outgoing object itself so we move the complexity into the caller themself. This will allow use to remove a good share of the similar function to obtains a changegroup in the 'changegroup.py' module. An important side effect is that we stop calling 'computeoutgoing' in 'getchangegroup'. This is fine as code that needs such argument processing is actually going through the 'exchange' module which already all this function itself.

outgoing: add a 'missingroots' argument This argument can be used instead of 'commonheads' to determine the 'outgoing' set. We remove the outgoingbetween function as its role can now be handled by 'outgoing' itself. I've thought of using an external function instead of making the constructor more complicated. However, there is low hanging fruit to improve the current code flow by storing some side products of the processing of 'missingroots'. So in my opinion it make senses to add all this to the class.

outgoing: adds some default value for argument We are about to introduce a third option to create an outgoing object: 'missingroots'. This argument will be mutually exclusive with 'commonheads' so we implement some default value handling in preparation. This will also help use to make more use of outgoing creation around the code base.

outgoing: pass a repo object to the constructor We are to introduce more code constructing such object in the code base. It will be more convenient to pass a repository object, all current users already operate at the repository level anyway. More changes to the contructor argument are coming in later changeset.

match: remove matchessubrepo method (API) Since it is no more used in cmdutil.{files,remove} and scmutil.addremove we remove this method.

subrepo: cleanup of subrepo filematcher logic Previously in the worst case we iterated the files in matcher twice and had a method only for this, which reimplemented logic in subdirmatchers constructor. So we replaced the method with a subdirmatcher.files() call.

pycompat: delay loading modules registered to stub Replacement _pycompatstub designed to be compatible with our demandimporter. try-except is replaced by version comparison because ImportError will no longer be raised immediately.

py3: import builtin wrappers automagically by code transformer This should be less invasive than mucking builtins. Since tokenize.untokenize() looks start/end positions of tokens, we calculates them from the NEWLINE token of the future import.

py3: provide (del|get|has|set)attr wrappers that accepts bytes These functions will be imported automagically by our code transformer. getattr() and setattr() are widely used in our code. We wouldn't probably want to rewrite every single call of getattr/setattr. delattr() and hasattr() aren't that important, but they are functions of the same kind.

py3: check python version to enable builtins hack Future patches will add (del|get|has|set)attr wrappers.

py3: move xrange alias next to import lines Builtin functions should be available in compatibility code.

check-code: allow assignment to hasattr variable

debugobsolete: add formatter support (issue5134) It appears that computing index isn't cheap if --rev is specified. That's why "index" field is available only if --index is specified. I've named marker.flags() as "flag" because "flags" implies a list or dict in template world. Thanks to Piotr Listkiewicz for the initial implementation of this patch.

formatter: add function to convert dict to appropriate format This will be used to process key-value pairs by formatter. The default field names and format are derived from the {extras} template keyword. Tests will be added later.

check-code: make dict() pattern less invasive 'foodict(x=y)' should be allowed.

hgweb: tweak zlib chunking behavior When doing streaming compression with zlib, zlib appears to emit chunks with data after ~20-30kb on average is available. In other words, most calls to compress() return an empty string. On the mozilla-unified repo, only 48,433 of 921,167 (5.26%) of calls to compress() returned data. In other words, we were sending hundreds of thousands of empty chunks via a generator where they touched who knows how many frames (my guess is millions). Filtering out the empty chunks from the generator cuts down on overhead. In addition, we were previously feeding 8kb chunks into zlib compression. Since this function tends to emit *compressed* data after 20-30kb is available, it would take several calls before data was produced. We increase the amount of data fed in at a time to 32kb. This reduces the number of calls to compress() from 921,167 to 115,146. It also reduces the number of output chunks from 48,433 to 31,377. This does increase the average output chunk size by a little. But I don't think this will matter in most scenarios. The combination of these 2 changes appears to shave ~6s CPU time or ~3% from a server serving the mozilla-unified repo.

test-gpg: run migration of v1 secret keys beforehand This suppresses unwanted output at "hg sign".

test-gpg: start gpg-agent under control of the test runner GnuPG v2 automatically starts gpg-agent. We should kill the daemon process.

test-gpg: make temporary copy of GNUPGHOME GnuPG v2 will convert v1 secret keys and create a socket under $GNUPGHOME. This patch makes sure no state would persist. We no longer need to verify trustdb.gpg, which was added by aae219a99a6e.

hgweb: document why we don't allow untrusted settings to control zlib Added comment per discussion on mercurial-devel.

hgweb: profile HTTP requests Currently, running `hg serve --profile` doesn't yield anything useful: when the process is terminated the profiling output displays results from the main thread, which typically spends most of its time in select.select(). Furthermore, it has no meaningful results from mercurial.* modules because the threads serving HTTP requests don't actually get profiled. This patch teaches the hgweb wsgi applications to profile individual requests. If profiling is enabled, the profiler kicks in after HTTP/WSGI environment processing but before Mercurial's main request processing. The profile results are printed to the configured profiling output. If running `hg serve` from a shell, they will be printed to stderr, just before the HTTP request line is logged. If profiling to a file, we only write a single profile to the file because the file is not opened in append mode. We could add support for appending to files in a future patch if someone wants it. Per request profiling doesn't work with the statprof profiler because internally that profiler collects samples from the thread that *initially* requested profiling be enabled. I have plans to address this by vendoring Facebook's customized statprof and then improving it.

hgweb: abstract call to hgwebdir wsgi function The function names and behavior now matches hgweb. The reason for this will be obvious in the next patch.

profiling: don't error with statprof when profiling has already started statprof.reset() asserts if profiling has already started. So don't call if it profiling is already running.

profiling: add a context manager that no-ops if profiling isn't enabled And refactor dispatch.py to use it. As you can see, the resulting code is much simpler. I was tempted to inline _runcommand as part of writing this series. However, a number of extensions wrap _runcommand. So keeping it around is necessary (extensions can't easily wrap runcommand because it calls hooks before and after command execution).

profiling: make profiling functions context managers (API) This makes profiling more flexible since we can now call multiple functions when a profiler is active. But the real reason for this is to enable a future consumer to profile a function that returns a generator. We can't do this from the profiling function itself because functions can either be generators or have return values: they can't be both. So therefore it isn't possible to have a generic profiling function that can both consume and re-emit a generator and return a value.

dispatch: set profiling.enabled when profiling is enabled We do this for other global command arguments. We don't for --profile for reasons that are unknown to me. Probably because nobody has needed it. An upcoming patch will introduce a new consumer of the profiling code. It doesn't have access to command line arguments. So let's set the config option during argument processing. We also remove a check for "options['profile']" because it is now redundant.

profiling: move profiling code from dispatch.py (API) Currently, profiling code lives in dispatch.py, which is a low-level module centered around command dispatch. Furthermore, dispatch.py imports a lot of other modules, meaning that importing dispatch.py to get at profiling functionality would often result in a module import cycle. Profiling is a generic activity. It shouldn't be limited to command dispatch. This patch moves profiling code from dispatch.py to the new profiling.py. The low-level "run a profiler against a function" functions have been moved verbatim. The code for determining how to invoke the profiler has been extracted to its own function. I decided to create a new module rather than stick this code elsewhere (such as util.py) because util.py is already quite large. And, I foresee this file growing larger once Facebook's profiling enhancements get added to it.

merge with stable

pycompat: avoid using an extra function We have a single line function which just lowercase the letters and replaces "_" with "". Its better to avoid that function call. Moreover we calling this function around 33 times.

pycompat: remove multiple occurences of urlencode By mistake we had two occurences of urlencode.

osx: stamp the hg version into the version field in the pkg This is required for tools like https://github.com/munki/munki, and is also more semantically correct.

performance: disable workaround for an old bug of Python gc Since disabling the gc does things worse for pypy and the bug was fixed in 2.7, let's only enable it in <2.7

merge: always use other, not remote, in user prompts Now that we store and display merge labels in user prompts (not just conflict markets), we should rely on labels to clarify the two sides of a merge operation (hg merge, hg update, hg rebase etc). "remote" is not a great name here, as it conflates "remote" as in "remote server" with "remote" as in "the side of the merge that's further away". In cases where you're merging the "wrong way" around, remote can even be the "local" commit that you're merging with something pulled from the remote server.

merge: use labels in prompts to the user Now that we persist the labels, we can consistently use the labels in prompts for the user without risk of confusion. This changes a huge amount of command output: This means that merge prompts like: no tool found to merge a keep (l)ocal, take (o)ther, or leave (u)nresolved? u and remote changed a which local deleted use (c)hanged version, leave (d)eleted, or leave (u)nresolved? c become: no tool found to merge a keep (l)ocal [working copy], take (o)ther [destination], or leave (u)nresolved? u and remote [source] changed a which local [dest] deleted use (c)hanged version, leave (d)eleted, or leave (u)nresolved? c where "working copy" and "destination" were supplied by the command that requested the merge as labels for conflict markers, and thus should be human-friendly.

journal: use the dirstate parentchange callbacks Instead of hacking into dirstate internals let's use the callbacks to be notified about wd parent change.

dirstate: add callback to notify extensions about wd parent change The journal extension had to touch the dirstate internals to be notified about wd parent change. To make that detection cleaner and reusable let's move it core. Now the extension can register to be notified about parent changes.