Summary:
See https://github.com/facebook/arcanist/pull/53
- Work correctly for directories with `%` in their name; this breaks under sprintf().
- Search for `src/` -> `tests/` style directories.
- Add coverage for search paths.
Test Plan:
Ran unit tests.
I don't have a working test case for PHPUnit tests, can one of you guys apply this and verify I didn't break your setups?
Reviewers: quard, aurelijus
Reviewed By: aurelijus
CC: aran
Differential Revision: https://secure.phabricator.com/D3558
Summary: Add `ruby -wc` as a linter and raise Error whenever there's a syntax error
Test Plan: Just a few dumb unit tests.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D3447
Summary:
Allow querying and modifying flags from arcanist. Currently
supports only printing and deleting flags for Differential revisions,
but it should be straightforward to add more capabilities (given Conduit
support).
Test Plan:
Run arc flag, passing it various revisions. Flags are
modified appropriately.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T1556
Differential Revision: https://secure.phabricator.com/D3133
Summary:
See <https://github.com/facebook/arcanist/issues/45>
Currently, when the user types `arc set-config x false`, we set it as the string "false", which is usually not desirable. We have some steps toward typed config already, but expand on what we have and move as much stuff as possible into it, including all the config settings that aren't currently documented (there are still some lint-specific and project-specific settings not present here, but this is most of it).
Also make the `phutil_libraries` key a legacy name for `load`, and `immutable_history` a legacy name for `history.immutable`. Generally the goal here is to make config simpler and bring it more in-line with Git/Mercurial, which use dotted hierarchies.
I'll add some documentation here but I think most of the changes should be fairly straightforward.
Test Plan:
- `arc set-config history.immutable on` (And similar -- sets to boolean true.)
- `arc set-config history.immutable off` (And similar -- sets to boolean false.)
- `arc set-config history.immutable derp` (And similar -- raises exception.)
- `arc set-config history.immutable ''` (And similar -- removes setting value.)
- `arc set-config --show`
- `arc get-config`
- `arc get-config base`
Reviewers: dschleimer, bos, btrahan, vrana
Reviewed By: dschleimer
CC: aran
Maniphest Tasks: T1546
Differential Revision: https://secure.phabricator.com/D3045
Summary:
Phabricator, as we all know, is marketed as a fun adventure game. However, while it is occasionally fun and often an adventure, it's so far been sorely deficient in the game aspect. This patch aims to rectify that oversight. (Presence of the first two qualities is not guaranteed.)
Note: In case there's any doubt, this is not a serious suggestion. I was bored.
Test Plan: Seriously?
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D3026
Summary:
Run `arc todo o rly?` to create a Maniphest task
titled 'o rly?'. Pass --cc to add CCs besides yourself.
Test Plan: Ran `arc todo o rly?`. Behaved as expected.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T749, T1325
Differential Revision: https://secure.phabricator.com/D2952
Summary:
Delete all code related to v1 libraries in arcanist.
When users liberate a v1 library, prompt them to upgrade.
Test Plan: Reverted phabricator/ to a couple of months ago and liberated it. Got prompted to upgrade. Upgraded.
Reviewers: vrana, btrahan
Reviewed By: vrana
CC: aran
Maniphest Tasks: T1103
Differential Revision: https://secure.phabricator.com/D2861
Summary:
- Move "arc branch"-specific code to the branch workflow.
- Instead of doing "git rev-parse", just do "git branch --verbose --abbrev=40".
- Use revision owners to identify ownership, not working copy identity. Particularly with the advent of "Commandeer", you might not own commits you made.
- Do a batch lookup for commits by hash (depends on D2859, but doesn't break without it).
- Use PhutilConsole for console stuff.
- Removed color from "arc list" for the moment.
- The "--by-status" flag has a slightly different output format now.
Test Plan: Ran "arc branch" in various circumstances, verified it identifies branches in immutable history repositories.
Reviewers: btrahan, vrana, jungejason, nh, slawekbiel
Reviewed By: slawekbiel
CC: aran
Maniphest Tasks: T693
Differential Revision: https://secure.phabricator.com/D2860
Summary: This displays all inline comments attached to a revision in a format consumable by editors.
Test Plan: Ran it, opened the file on the line.
Reviewers: epriestley
Reviewed By: epriestley
CC: vii, aran, Korvin
Differential Revision: https://secure.phabricator.com/D2845
Summary:
New optional mode. If you set 'base' in local, project or global config or pass '--base' to 'arc diff' or 'arc which', it switches to DSL mode.
In DSL mode, lists of rules from args, local, project and global config are resolved, in that order. Rules can manipulate the rule machine or resolve into actual commits. Provides support for some 'arc' rules (mostly machine manipulation) and 'git' rules (symbolic ref and merge-base).
Test Plan:
Ran unit tests. Also:
```$ arc which --show-base --base 'arc:prompt'
Against which commit? HEAD
HEAD
$ arc which --show-base --base 'git:HEAD'
HEAD
$ arc which --show-base --base 'git:fake'
Usage Exception: None of the rules in your 'base' configuration matched a valid commit. Adjust rules or specify which commit you want to use explicitly.
$ arc which --show-base --base 'git:origin/master'
origin/master
$ arc which --show-base --base 'git:upstream'
Usage Exception: None of the rules in your 'base' configuration matched a valid commit. Adjust rules or specify which commit you want to use explicitly.
$ arc which --show-base --base 'literal:derp'
derp
$ arc which --show-base --base 'arc:halt'
Usage Exception: None of the rules in your 'base' configuration matched a valid commit. Adjust rules or specify which commit you want to use explicitly.
$ arc set-config --local base git:origin/master
Set key 'base' = 'git:origin/master' in local config.
$ arc which --show-base
origin/master
$ arc which --show-base --base 'git:HEAD^'
HEAD^
$ arc which --show-base --base 'arc:yield, git:HEAD^'
origin/master
$ arc which --show-base --base 'arc:global, git:HEAD^'
HEAD^
$ arc which --show-base --base 'arc:global, git:merge-base(origin/master)'
3f4f8992fba8d1f142974da36a82bae900e247c0```
Reviewers: dschleimer, vrana
Reviewed By: dschleimer
CC: aran
Maniphest Tasks: T1233
Differential Revision: https://secure.phabricator.com/D2748
Summary:
I just hope that we will not create `ArcanistPhutilTestCaseTestCaseTestCase`.
Also fix a copy/paste error (@edward's this time).
Test Plan: `arc unit`
Reviewers: epriestley
Reviewed By: epriestley
CC: edward, aran, Korvin
Differential Revision: https://secure.phabricator.com/D2692
Summary:
This need a bunch of work, but is a sort of minimum viable product for the hgdaemon.
The two ProtocolChannels implement the client and server halves of the protocol.
The Server implements the server logic, the Client implements the client logic.
Test Plan: Launched a server and client on the same repo, got hg output in ~2-3ms instead of 100ms+.
Reviewers: csilvers, btrahan, vrana
Reviewed By: csilvers
CC: aran
Differential Revision: https://secure.phabricator.com/D2665
Summary:
It makes me nervous.
Also move them to the dir.
Test Plan:
`arc lint`
`arc lint --output json`
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Koolvin
Differential Revision: https://secure.phabricator.com/D2644
Summary: Mechanical changes from D2588. No "Class.php" moves yet because they aren't necessary for libraries to function.
Test Plan: See D2588.
Reviewers: vrana, btrahan, jungejason
Reviewed By: vrana
CC: aran
Maniphest Tasks: T1103
Differential Revision: https://secure.phabricator.com/D2589
Summary:
Adds a linter for v2 libraries which raises the relevant errors.
NOTE: Not hooked up anywhere yet, so this diff has no effect.
Test Plan:
Switched the ModuleLinter to LibraryLinter and ran it with a junk block to trigger errors:
>>> Lint for src/lint/linter/phutillibrary/ArcanistPhutilLibraryLinter.php:
Error (PHL3) One Class Per File
File 'lint/linter/phutillibrary/ArcanistPhutilLibraryLinter.php' mixes
function (id) and class/interface (ArcanistPhutilLibraryLinter)
definitions in the same file. A file which declares a class or an
interface MUST declare nothing else.
190 }
191
192 if (false) {
193 function id() { }
194 new XYZ();
195 }
Error (PHL2) Duplicate Symbol
Definition of function 'id' in
'lint/linter/phutillibrary/ArcanistPhutilLibraryLinter.php' in library
'arcanist' duplicates prior definition in 'utils/utils.php' in library
'phutil'.
190 }
191
192 if (false) {
193 function id() { }
194 new XYZ();
195 }
Error (PHL1) Unknown Symbol
Use of unknown class 'XYZ'. This symbol is not defined in any loaded
libphutil library.
191
192 if (false) {
193 function id() { }
194 new XYZ();
195 }
Reviewers: vrana, btrahan
Reviewed By: vrana
CC: aran
Maniphest Tasks: T1103
Differential Revision: https://secure.phabricator.com/D2597
Summary:
Simple wrapper for PHP_CodeSniffer.
You need to have PHP_CodeSniffer and it's dependencies installed.
Test Plan: - Try running it with your custom lint engine
Reviewers: epriestley
CC: aran, Koolvin
Differential Revision: https://secure.phabricator.com/D2560
Summary:
PHPUnit wrapper for arc.
The idea here is simple - find the test case which is related to the updated
class file. Generate tmp files for json & clover reports, run phpunit
with provided arguments.
It supports phpunit configuration file setting in `.arcconfig`: `phpunit_config`.
Path should be relative to project root.
Test Plan:
- Set `unit_engine` to `PhpunitTestEngine`
- Try running tests with & without `phpunit_config` option.
Reviewers: epriestley, davidreuss
Reviewed By: epriestley
CC: aran, Koolvin, jungejason
Differential Revision: https://secure.phabricator.com/D2472
Summary:
- Try to limit the pain of //future// version bumps by making arc self-updating.
- When the server needs a newer version, prompt the user to update.
- (We need them to reissue their command because we may already have loaded classes which have changed in the update.)
- Make the message sound exciting!
Test Plan: Artifically bumped server forward, ran "arc list", got to upgrade!
Reviewers: Makinde, nh, jungejason, btrahan
Reviewed By: nh
CC: aran
Differential Revision: https://secure.phabricator.com/D2435
Summary:
The major thing I want to do here is allow you to set a default Phabricator URI, so we can make "arc paste", and "arc upload", "arc download" work anywhere.
We can also relax the .arcconfig requirements (request from @csilvers).
Test Plan:
Get/set some values?
iiam
Reviewers: btrahan, vrana, jungejason
Reviewed By: btrahan
CC: aran
Differential Revision: https://secure.phabricator.com/D2400
Summary:
Wrapper for Python 'nose' (http://readthedocs.org/docs/nose/en/latest/)
testing tool.
Test Plan:
Install latest 'nose' v1.1.3. Currently it is available through
Github only (``pep install git+https://github.com/nose-devs/nose.git``).
Create a Python project with following structure:
/package_name/module_name.py
/tests/package_name/test_module_name.py
Write some tests
Run ``arc unit``
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Koolvin, zeeg
Differential Revision: https://secure.phabricator.com/D2322
Summary:
Allow tests to be skipped by calling assertSkipped(). It's not really
an assertion of anything tangible; more like "assert that we can't
really assert anything right now".
Test Plan: Added a new test to the PhutilUnitTestEngineTestCase.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Koolvin
Differential Revision: https://secure.phabricator.com/D2312
Summary:
- Replace SVN-specific language with VCS-agnostic language.
- Add new "arc close-revision", works exactly like "arc mark-committed" but with agnostic language.
- Use status constants, not status strings.
- Mark "arc mark-committed" deprecated.
- Remove deprecated "arc merge".
Test Plan: Ran "arc mark-committed", "arc close-revision".
Reviewers: btrahan, vrana, jungejason
Reviewed By: btrahan
CC: aran, Makinde
Maniphest Tasks: T909
Differential Revision: https://secure.phabricator.com/D2244
Summary:
```arc close T1088 --status wontfix --message "I'm not going to fix this."```
T1088 is the test task to screw with, so feel free.
Test Plan: ```arc close T1088 --status [ resolved | wontfix | invalid | duplicate | spite | open ] -m "Message"```
Reviewers: epriestley
CC: aran
Differential Revision: https://secure.phabricator.com/D2162
Summary:
Added `arc tasks`:
%%%arc tasks
arc tasks --view-all // View Open and Closed Tasks
arc tasks --by-status // Group By Status
arc tasks --by-priority // Group By Priority%%%
Test Plan: Connect to conduit and run arc tasks >> make sure you have tasks =p
Reviewers: epriestley, indiefan
Reviewed By: epriestley
CC: aran, epriestley
Maniphest Tasks: T749
Differential Revision: https://secure.phabricator.com/D1943
Summary:
See task. Allow mercurial users to diff with uncommitted changes.
- By default, commit range is merge-base of `hg outgoing` to `.` (dirstate).
- You can get JUST dirstate with `arc diff tip` or similar.
- This ended up being a giant mess various other changes to deal with empty `hg outgoing` and empty dirstate.
Test Plan: Diffed with uncommitted changes, got sensible prompts and results.
Reviewers: Makinde, btrahan
Reviewed By: btrahan
CC: aran, epriestley
Maniphest Tasks: T998
Differential Revision: https://secure.phabricator.com/D1954
Summary: `arc which` and related workflows have supplanted these now-unused mechanisms.
Test Plan: Grepped for chooseRevision() and DifferentialRevisionRef.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran, epriestley
Differential Revision: https://secure.phabricator.com/D1841
Summary:
Allow users to easily define aliased arc commands. This is easier than making
them muck around with shell stuff, and lets me do stuff like "arc alias adiff
diff -- --auto" so I can test --auto more easily.
There are some limitations here (for example, you can't put --trace in an alias
because it gets parsed too early) but I think it's a reasonable starting point.
Test Plan: Set, listed, removed and used aliases.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran, epriestley
Maniphest Tasks: T896
Differential Revision: https://secure.phabricator.com/D1653
Summary:
- Move name helper functions to ArcanistXHPASTLintNamingHook to make it easier
to write custom linters.
- Add test coverage for name functions.
- Add 'variable' and 'global' naming convention tests.
- Expand test cases.
- Improve lint message error when an unexpected message is raised during a
test.
- Remove a defunct XHP lint message.
Test Plan:
- Ran unit tests.
- Ran "arc lint --lintall" on arcanist/.
Reviewers: btrahan, nh, jungejason
Reviewed By: btrahan
CC: johnduhart, aran, epriestley, arudolph
Differential Revision: https://secure.phabricator.com/D1506
Summary:
This is a fancy version of "land.sh" that uses "git merge --squash" and
"arc which" to cover more cases.
Test Plan:
Ran "arc land" against various repository states (no such branch, not
accepted, valid, etc). Things seemed OK. There are basically an infinite number
of states here so it's hard to test exhaustively.
Reviewers: cpiro, btrahan, jungejason, davidreuss
Reviewed By: davidreuss
CC: zeeg, aran, epriestley, davidreuss
Maniphest Tasks: T787, T723
Differential Revision: https://secure.phabricator.com/D1488
ArcanistRepositoryAPI->loadWorkingCopyDifferentialRevisions()
Summary:
- See T787.
- @cpiro has an immediate use case for this, which is ##arc amend --revision
`arc which --id` --show master## for "git merge --autosquash" or similar.
- For T614, we need this to choose "--create" vs "--update".
- Other workflows should also use this to improve how often we automatically
get things right, particularly in Mercurial and SVN.
Test Plan:
Ran "arc which" in SVN, Git and HG working copies with various flags;
results seemed reasonable.
Reviewers: btrahan, cpiro, jungejason
Reviewed By: btrahan
CC: aran, epriestley
Maniphest Tasks: T787
Differential Revision: https://secure.phabricator.com/D1478
Summary:
Julien built a really cool static analysis database of our codebase. One
capability is that it can suggest typehints that are not in the code. The
analysis to do this is very expensive, so it can't reasonably be run locally.
But it can remain indexed on a server.
The idea here is to provide a familiar interface to it through arc lint, via a
generic Conduit service call.
In our lint engine, this will probably be gated on --advice for performance.
This will introduce a slight awkwardness in that running with --advice can add
new non-advice lint if the server chooses, but this isn't likely to cause a
practical problem.
Test Plan:
Construct a fake Conduit lint endpoint, attach this linter to it, and see bogus
lint
appear with --advice.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran
Differential Revision: https://secure.phabricator.com/D1462
Summary: D1439 added a new class which had the wrong name in the map from D1439.
Whoopsiepoos!
Test Plan: unit tests now pass
Reviewers: epriestley, zeeg
Reviewed By: epriestley
CC: aran
Differential Revision: https://secure.phabricator.com/D1441
Summary:
This adds a new lint engine, ComprehensiveLintEngine, which
includes sane defaults for some generic languages.
Ideally this would include *all* available language linters,
but that can be enhanced at a later point. Right now it's mostly
the base linter with additional JavaScript and Python linters.
Test Plan:
Adjust the lint_engine to be "ComprehensiveLinterEngine". You'll
also need jshint, pyflakes, and pep8 to all be available on PATH.
Run arc lint against files which contain .php, .py, and .js.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran
Differential Revision: https://secure.phabricator.com/D1439
Summary:
Inspired by http://news.ycombinator.com/item?id=3464671 and a lot of
diffs I've seen @ FB, I've added a spell checking linter. To reduce
false positives, it's only a blacklist. Still, it catches a large
number of 'issues'.
Test Plan:
Unit tests. Ran on FB's codebase. No false positives
noticed but a lot of cases caught.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, epriestley, jack
Differential Revision: https://secure.phabricator.com/D1409
This patch adds ArcanistJSHintLinter class and three new .arcconfig options:
* lint.jshint.prefix - directory where JSHint binary resides
* lint.jshint.bin - JSHint binary name (if different from 'jshint')
* lint.jshint.config - a JSON file with JSHint project-wide options
By default, this linter assumes that JSHint is installed on user's system
as an NPM package.
Test Plan:
(1)
Run `npm install jshint -g` to install JSHint and add
ArcanistJSHintLinter to your Lint Engine (I didn't see PEP8 or
PyFlakes in the PhutilLintEngine so I decided to not to put
JSHint in there). After that you can do `arc lint my.js`.
(2)
Create a new file, config.json, and add `{ "white": true }` in it.
Add `"lint.jshint.config": "/path/to/config.json"` to your .arcconfig and
run `arc lint my.js`. After that, unless your name is Douglas Crockford,
you'll see tons of JSHint warnings about minor PEP8-like things (spacing, etc.)
revision is the correct base revision relative to the patch.
Summary: What the title says. If not correct, warn the user. This check
honors the --force flag to skip all these checks. This change also includes
moving some Differential constants into Arc so they can be used for both
projects. There is a corresponding phabricator diff (incoming) to address this
part of the change.
Test Plan:
For a project with actual diffs, a git repository tracked by phabricator, *AND*
development in master branch only, do some...
- git reset --hard HEAD^1
- arc patch DX, where X is what got us to HEAD in the first place
- verify successful patch
...then...
- git reset --hard HEAD^^
- arc patch DX, where X is what got us to HEAD in the first place
- verify warning
- verify Y versus N continues versus stops appropriately
Note if development were done outside the master branch this warning message
will fire early / often as git commit hashes are based on the commit *and* the
rest of the source code the commit is made against. This is (unfortunately) the
"typical" case so this warning is pretty active at the moment. T201 will
eventually land and when parsing a given commit update the corresponding diff.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, btrahan, epriestley
Differential Revision: https://secure.phabricator.com/D1328
Summary:
Creates a new hook API that can be used to interface with
SVN/Git/Mercurial in the context of a commit hook. Currently only adds a
function to read the modified file data in a Subversion commit hook.
An object of this API is created in the SvnHookPreCommitWorkflow and
passed on the Lint Engine which then uses it to access current file
data, of the way the APIs seem to be structured); linters use the
getData function which is essentially a wrapper around the engine's
call, with another layer of caching.
Task ID: #770556
Blame Rev:
Test Plan:
- Create a local svn repository and add a minimal hook to run the local
version of arc to test commits
(http://phabricator.com/docs/arcanist/article/Installing_Arcanist_SVN_Hooks.html)
- Create a temporary repository that can trigger any of the linters
available, and test against a temporary linter by committing against
the test repository: the linter should be able to access all required
files by using loadData/getData in the LintEngine and Linter.
Revert Plan:
Tags: lint, svn-hook-pre-commit
Reviewers: jungejason, asukhachev, epriestley, aran
Reviewed By: epriestley
CC: aran, jungejason, epriestley, kunalb, asukhachev
Differential Revision: https://secure.phabricator.com/D1256
Test Plan:
Added a test event listener, added an event dispatch in diff workflow, run the
workflow, the listener was called.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, jungejason, epriestley
Differential Revision: 1102
Summary:
We used square distance that optimized for the wrong thing. Making the same
markers spread out instead of being together
Also added a very little cost for switching type. That will make diff types
stick together a bit more
Task ID: #623
Blame Rev:
Test Plan:
Ran my new unit test. And tested a few diff in phabricator
Revert Plan:
Tags:
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, epriestley
Differential Revision: 1112
Summary: 'patch' chokes on hunks with too much trailing stuff. 'git apply'
chokes on overlapping hunks. Make them both happy. Write some test cases so I
stop breaking this stuff.
Test Plan:
- Applied a previously-failing patch via SVN.
- Applied a previously-failing-then-succeeding patch via Git.
- Ran unit tests.
Reviewers: jungejason, btrahan, nh, tuomaspelkonen, aran
Reviewed By: jungejason
CC: aran, jungejason
Differential Revision: 1099
Summary: Move code to actually parse "hg" output into a separate class with some
tests, so I can reuse it in the import scripts. We should probably do this for
Git/SVN at some point, too.
Test Plan: Ran unit tests, used this class in Phabricator importers, grepped for
calls to removed private methods.
Reviewers: Makinde, jungejason, nh, tuomaspelkonen, aran
Reviewed By: Makinde
CC: aran, Makinde
Differential Revision: 942
Summary:
This should support conservative rewrite policies in git fairly well, under an
assumed workflow of:
- Develop in local branches, never rewrite history.
- Commit with "-m" or by typing a brief, non-template commit message
describing the checkpoint.
- Provide rich information in the web console (reviewers, etc.)
- Finalize with "git checkout master && arc merge branch && git push" or some
flavor thereof.
This supports Mercurial somewhat. The major problem is that "hg merge" fails if
the local is a fastforward of the remote, at which point there's nowhere we can
throw the commit message. Oh well. Just push it and we'll do our best to link
them up based on local commit info.
I am increasingly forming an opinion that Mercurial is "saftey-scissors git".
But also maybe I have no clue what I'm doing. I just don't understand why anyone
would think it's a good idea to have a trunk consisting of ~50% known-broken
revisions, random checkpoint parts, whitespace changes, typo fixes, etc. If you
use git with branching you can avoid this by making a trunk out of merges or
with rebase/amend, but there seems to be no way to have "one commit = one idea"
in any real sense in Mercurial.
Test Plan: Execute "arc merge" in git and mercurial.
Reviewers: fratrik, Makinde, aran, jungejason, tuomaspelkonen
Reviewed By: Makinde
CC: aran, epriestley, Makinde
Differential Revision: 860
Summary:
See T326. Allow lint rules to be selectively overridden, e.g. for Conduit
methods.
Since FB has a long history of suggesting crazy patches for this stuff I think
we're safer just adding a hook class than trying to do some kind of regexp
magic.
Test Plan: Wrote a hook for Phabricator and linted some Conduit files without
issues. Ran unit tests.
Reviewers: nh, jungejason, tuomaspelkonen, aran
Reviewed By: nh
CC: aran, nh
Differential Revision: 874
Summary:
There's a lot of ground left to cover but this makes "arc diff" work (on one
trivial diff) in my sandbox, at least, and supports parsing of Mercurial native
diffs (which are unified + a custom header). Piles of missing features, still.
Some of this is blocked by me not understanding the mercurial model well yet.
This is also a really good opportunity for cleanup (especially, reducing the
level of "instanceof" in the diff workflow), I'll try to do a bunch of that in
followup diffs.
Test Plan: Ran "arc diff" in a mercurial repository, got a diff out of it.
Reviewed By: aran
Reviewers: Makinde, jungejason, tuomaspelkonen, aran, codeblock
CC: aran, epriestley, codeblock, fratrik
Differential Revision: 792
