fsmonitor: do not nuke dirstate filecache In the future, chg may prefill repo's dirstate filecache so it's valuable and should be kept. Previously we drop both filecache and property cache for dirstate during fsmonitor reposetup, this patch changes it to only drop property cache but keep the filecache.

perf: move gettimer() call This is more consistent with other perf* functions.

perf: don't clobber startrev variable Previously, the "startrev" argument would be ignored due to "startrev = 0" in the benchmark function. This meant that `hg perfrevlog` always started at revision 0. Rename the local variable to "beginrev" so the variable does the right thing.

bundle: add optional 'tagsfnodecache' data to on disk bundle (issue5543) This should help performance when unbundling.

bundle2: move tagsfnodecache generation in a generic function This will help us reusing the logic for `hg bundle`.

bundle: introduce an higher level function to write bundle on disk The current function ('writebundle') is focussing on getting an existing changegroup to disk. It is no easy ways to includes more part in the generated bundle2. So we introduce a slightly higher level function that is fed the 'outgoing' object (that defines the bundled spec) and the bundlespec parameters (to control the changegroup generation and inclusion of other parts). This is creating the third logic dedicated to create a consistent bundle2 (the other 2 are the push code and the getbundle code). We should probably reconcile them at some points but they all takes different types of input. So we need to introduce an intermediate "object" that each different input could be converted to. Such unified "bundle2 specification" could be fed to some unified code. We start by having the `hg bundle` related code on its own to helps defines its specific needs first. Once the common and specific parts of each logic will be known we can start unification.

bundle: handle compression earlier We can also handle that part before starting any generation.

bundle: check changegroup version earlier We can check if we know how to bundle this changegroup version before actually starting to generate the changegroup.

bundle: check lack of revs to bundle before generating the changegroup We already have the information so we can check it earlier.

extdiff: copy back files to the working directory if the size changed In theory, it should be enough to pay attention only to the modification time when detecting if a snapshotted working directory file changed. In practice, BeyondCompare preserves all file attributes when syncing files at the directory level. (If you open the file and sync individual hunks, then mtime does change, and everything was being copied back as desired.) I'm not sure how many other synchronization tools would trigger this issue, but it's annoyingly inconsistent (if a single file is diffed, it isn't snapshotted, so the same BeyondCompare file sync operation _is_ visible, because wdir() is updated in place. I filed a bug with them, and they stated it is on their wish list, but won't be fixed in the near term. This isn't a complete fix (there is still the case of the size not changing), but this seems like a trivial enough change to fix most of the problem. I suppose we could fool around with making files in the other snapshot readonly, and copy back if we see the readonly bit copied. That seems pretty hacky though, and only works if the external tool copies all attributes.

test-extdiff: enable a previously failing test on Windows

test-extdiff: narrow the range of an '#if execbit' block Now that output can be conditionalized, the few `chmod +x` specific outputs can be conditionalized, and the rest of the tests run as normal. Disable one test that is failing on Windows for now.

test-extdiff: deduplicate tests

test-extdiff: fill in a missing Windows test

policy: eliminate ".pure." from module name only if marked as dual So we can switch cext/pure modules to new layout one by one.

policy: add "cext" package which will host CPython extension modules I'm going to restructure cext/pure modules and get rid of our hgimporter hack. C extension modules will be moved to cext/ directory so old and new compiled modules can coexist in development tree. This is necessary to run 'hg bisect' without recompiling. New extension modules will be loaded by an importer function: base85 = policy.importmod('base85') # select pure.base85 or cext.base85 This will also allow us to split cffi from pure modules, which is currently difficult because pure modules can't be imported by name.

policy: mark all string literals as sysstr or bytes The policy module won't be imported early in future, which means string literals will be processed by our Python 3 loader.

debuginstall: check C extensions only if they are loadable per policy This check is useless in pure installation and I want to make it directly import C extension modules.

osutil: proxy through util (and platform) modules (API) See the previous commit for why. Marked as API change since osutil.listdir() seems widely used in third-party extensions. The win32mbcs extension is updated to wrap both util. and windows. aliases.

mpatch: proxy through mdiff module See the previous commit for why.

bdiff: proxy through mdiff module See the previous commit for why. mdiff seems a good place to host bdiff functions. bdiff.bdiff was already aliased as textdiff, so we use it.

base85: proxy through util module I'm going to replace hgimporter with a simpler import function, so we can access to pure/cext modules by name: # util.py base85 = policy.importmod('base85') # select pure.base85 or cext.base85 # cffi/base85.py from ..pure.base85 import * # may re-export pure.base85 functions This means we'll have to use policy.importmod() function in place of the standard import statement, but we wouldn't want to write it every place where C extension modules are used. So this patch makes util host base85 functions.

mdiff: move re-exports to top This style seems more common in our codebase.

test-commit-interactive-curses: remove unused import of parsers

strip: make tree stripping O(changes) instead of O(repo) The old tree stripping logic iterated over every tree revlog in the repo looking for commits that had revs to be stripped. That's very inefficient in large repos. Instead, let's look at what files are touched by the strip and only inspect those revlogs. I don't have actual perf numbers, since internally we don't use a true treemanifest, but simply iterating over hundreds of thousands of revlogs takes many, many seconds, so this should help tremendously when stripping only a few commits.

strip: move tree strip logic to it's own function This will allow external extensions to modify tree strip behavior more precisely.

manifest: remove unused property _oldmanifest The last use seems to have gone away in 7c7d845f8b64 (manifest: make manifestlog use it's own cache, 2016-11-10).

py3: convert key to str to make kwargs.pop work in mq The keys are passed here and there as unicodes and our transformer make things bytes. Due to that, mq was not poped and this results in error on Py3. Here we abuse r'' to make that str on Python 3.

py3: convert kwargs' keys to str before passing in cmdutil.getcommiteditor

diff: add a fast path to avoid loading binary contents When diffing binary contents, with certain configs, we can show "Binary file <name> has changed" without actual content. That allows a fast path where we could avoid providing actual binary contents. Note: in that case we still need to test if two contents are the same, that's done by using "filectx.cmp", which could have its own fast path.

diff: correct binary testing logic This seems to be more correct given the table drawn in the previous patch. Namely, "losedatafn" and "opts.git" are removed, "not opts.text" is added. - losedatafn: diff output (binary) should not be affected by "losedatafn" - opts.git: binary testing is helpful for detecting a fast path in the next path. the fast path can also be used if opts.git is False - opts.text: if it's set, we should treat the content as non-binary

diff: draw a table about binary diff behaviors The table should make it easier to reason about future changes.