Support for lint messages which are always shown

Summary: If one wishes to implement a linter which finds unused resources or variables the current scheme does not work as the lint engine filters all changes from lines which were not introduced in a diff. To solve that, I've added an "always show" configuration for a lint message allowing creation of such linters.

Test Plan:
1. Created a custom linter for finding unused Android resources in a project
2. Ran arc lint with linter added and received warnings as expected

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D6119
Fix a `catch` class name

Summary: Now that we examine these in lint, this came up. There is no `ConduitException`; the class is `ConduitClientException`.

Test Plan: Lint.

Reviewers: vrana, chad

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D6158
When a file upload fails during "arc diff", show why

Summary: We currently swallow the exception message, but this isn't useful. Fixes T3354.

Test Plan:
  $ arc diff HEAD^ --conduit-uri=http://local.aphront.com:8080/ --only
  Uploading 1 files...
  Failed to upload new binary 'large.png'.

  [HTTP/500] Internal Server Error
  As received by the server, this request had a nonzero content length but no POST data.

  Normally, this indicates that it exceeds the 'post_max_size' setting in the PHP configuration on the server. Increase the 'post_max_size' setting or reduce the size of the request.

  Request size according to 'Content-Length' was '2093052', 'post_max_size' is set to '100K'.

      Continue? [Y/n]

Reviewers: jamesr, chad

Reviewed By: chad

CC: aran

Maniphest Tasks: T3354

Differential Revision: https://secure.phabricator.com/D6186
Add PytestTestEngine
Don't prepopulate update message in hg amend diff workflow

Summary:
Previously, updating a commit via arc diff in mercurial would
prepopulate the update message with part of the commit message.  In an
amend workflow this doesn't make sense, so I disabled it. Git already
does this, so now mercurial matches git in this scenario.

We had users complain that new users would often submit diffs with the
default update message, and it wasn't useful since they were using a
amend flow.

Test Plan:
arc diff on a commit that already had a diff
Verified the editor did not have a update message
arc diff on a stack of commits where the bottom one had a diff
Verified the editor provided a default update message

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D6215
Add Delete Flag to Paths ignore mask

Summary:
When `arc diff` runs unit tests it uses all of the affected files as the base array of paths. These files may have been deleted. If the deleted file fits the test criteria `unit` will try and run the test and in some cases fail.

An example of this fataling is with PHPUnit;

> Fatal error: Uncaught exception 'Exception' with message 'JSON report file is em
pty, it probably means that phpunit failed to run tests. Try running arc unit wi
th --trace option and then run generated phpunit command yourself, you might get
 the answer.' in C:\Websites\facebook\arcanist\src\unit\engine\PhpunitResultPars
er.php on line 156

Test Plan: Re-ran the tests that were causing issues with `arc unit --rev HEAD^ --trace`

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin, aurelijus

Differential Revision: https://secure.phabricator.com/D6246
Allow passing library name with flag

Summary: Enables the process to pass the user input for library name. Fixes T3342

Test Plan: Little help... `arc liberate` doesn't run on windows. Though I saw the flag :)

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T3342

Differential Revision: https://secure.phabricator.com/D6306
Update some output based on flag being set

Summary: Makes sense now

Test Plan: Get someone else to test it

Reviewers: epriestley

CC: aran, Korvin

Maniphest Tasks: T3342

Differential Revision: https://secure.phabricator.com/D6307
Don't instantiate abstract classes in ArcanistConfiguration::buildAllWorkflows

Summary:
I wanted to write a couple of workflows that shared some code in an abstract superclass, but ##arc## would fail trying to instantiate the abstract class.

As it turns out, we can modernize the ##buildAllWorkflows## function a bit, and it will only load concrete objects.

Test Plan:
1. Define an abstract subclass of ##ArcanistBaseWorkflow##.
2. ##arc liberate## the source directory that contains it.
3. Try any ##arc## operation without this diff, and see it fail.
4. Patch this diff and see that ##arc## operations work now.

Reviewers: epriestley, vrana

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D6324
Stop using deprecated Conduit methods in `arc`

Summary:
  - Replace `maniphest.find` with `maniphest.query`. These calls are nearly identical, it was just a rename for consistency.
  - Replace `differential.find` with `differential.query`.

Test Plan:
  - Ran `arc tasks`.
  - Ran `arc close-revision` on valid, nonexistent, and existent-but-invalid revisions.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D6336
Update spelling replacement rule for 'algorithmical'

Summary:
I suspect that when people use 'algorithmical', they mean it as an adjective and not an adverb.

'algorithmic' = adjective
'algorithmically' = adverb

Test Plan: Add the word 'algorithmical' to a file. Run `arc lint` on the file. See suggestion to correct it to 'algorithmic'.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D6373
add css lint
update __phutil_library_map__
comment typo fix
Lint undeclared variables in strings

Summary: Depends on D6405.

Test Plan:
New unit test.
Linted libphutil, Arcanist, Phabricator.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D6406
Display line number with assertion for failed test cases

Summary: We use custom `assert*` functions here and there. Remove them from backtrace.

Test Plan: Ran `XHPASTTreeTestCase`.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D6411
arc browse: Support line number and reduce conduit call

Summary:
support common "filename:line number" format.
Also, remove redundent conduit call.

Test Plan: arc browse with and without :33 suffix.

Reviewers: epriestley, vrana

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D6451
Merge pull request #93 from vlajos/csslint

CSS lint support for arcanist using csslint.
Revert "Merge pull request #93 from vlajos/csslint"

This reverts commit 2852a965e3308dcb81d1d7154e1a25aa72d74139, reversing
changes made to 46bb3dbc361729ba589c73ddd550f7d570f5d26f.

See: https://github.com/facebook/arcanist/pull/93
Pass correct filename into PHPUnitTestEngine coverage

Summary: The test result parser in PhpunitTestEngine was receiving $test_path from the previous loop instead of $path from the current one. The variable isn't actually used in the PhpunitResultParser object (it exists for strict compatibility with the parent class) so it didn't cause any problems, but who knows if that could change in the future

Test Plan: Review diff. No changes to the output of running 'arc unit' when using the Phpunit engine, as expected

Reviewers: epriestley

CC: aran, epriestley, aurelijus, chad

Differential Revision: https://secure.phabricator.com/D6587