Bump required PHP version

Test Plan:
  arc lint

Reviewers: epriestley

Reviewed By: epriestley

CC: aran

Differential Revision: https://secure.phabricator.com/D2127
Fix an issue with "arc diff --update" in Git on immutable workflows

Summary:
This should be a raw text block, not a parsed message object.

I broke this in rARC1f13e022cdc9bf4859274a83784bd615caf62ef9 when I improved Mercurial support.

See: https://github.com/facebook/arcanist/issues/23

Test Plan: (Will update this diff...)

Reviewers: vrana, jungejason, btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D2136
Make "--auto" the default for "arc diff"

Summary:
NOTE: This is a disruptive change to how 'arc diff' behaves by default.

Many years ago, Differential (then DiffCamp) supported SVN. Someone added a "-i" mode to the "diffcamp" script so you could "git show | diffcamp -i", and thus we were
forever bound to storing metadata in commit messages.

But this isn't a common use case outside of Facebook + git-svn, and isn't very flexible. We now have a great deal of flexibility to identify revisions based on
hashes, branch names, etc, and to sync metdata from web to CLI and back. I want to jettison the commit-message-bound artifacts of the tool's history, and move to a
more flexible, modern workflow.

I added "--auto" a while ago, which figures out if you want to create or update a diff automatically, and then prompts you for whatever data it needs, reading
information if it can from commit messages in the range. This is a vastly better workflow in general, especially for SVN and Mercurial users (who currently need to
jump to the web UI to create revisions). It's better for git users too, since they don't need to use template commits and don't have to muck with or configure
templates. However, it's a nontrivial change to git users' core workflow that is clearly different in more ways than it is clearly better.

  - This might be contentious, but probably not toooo much, I hope?
  - I also deleted the (fairly ridiculous) workflow where we sync commit message changes from the working copy. I think two or three people will be REALLY upset about
this but I have no sympathy. "--edit" covers this and has been around for like two years now, and making the commit message and web dual-authoritative was always a bad
idea that we only ever half-accommodated anyway (see giant swaths of removed TOOD nonsense).

Test Plan:
  - I've been using "--auto" exclusively for like a month, it seems to work well.
  - Created/updated SVN, Git and HG diffs with "arc diff" under this workflow.

Reviewers: btrahan, jungejason, nh

Reviewed By: btrahan

CC: Makinde, vrana, zeeg, mbautin, aran, yairlivne, 20after4

Maniphest Tasks: T614

Differential Revision: https://secure.phabricator.com/D2080
Add arc tasks command

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
Merge pull request #24 from Koolvin/arcpatch-D1943

Add arc tasks command
Raise lint warning on missing space after comma

Summary: Saw this in a diff somewhere; complain about it.

Test Plan: Unit coverage.

Reviewers: btrahan, vrana, jungejason

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1060

Differential Revision: https://secure.phabricator.com/D2153
Add arc close command

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
Call phutil_passthru() instead of passthru() in liberate

Summary: Solves T1085 and is probably slightly better anyway.

Test Plan:
  arc liberate

Reviewers: epriestley

Reviewed By: epriestley

CC: aran

Maniphest Tasks: T1085

Differential Revision: https://secure.phabricator.com/D2151
Merge pull request #25 from Koolvin/arc_close

Add arc close command
Unify links to www.phabricator.com and phabricator.com

Test Plan: Visit http://www.phabricator.com/docs/phabricator/article/Arcanist_User_Guide:_Configuring_a_New_Project.html.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran

Maniphest Tasks: T1096

Differential Revision: https://secure.phabricator.com/D2171
Provide a "loadFileDataCallback" for ArcanistBundle

Summary: See next diff for an explanation of this issue.

Test Plan: See next diff.

Reviewers: Makinde, btrahan, vrana, jungejason

Reviewed By: Makinde

CC: aran

Differential Revision: https://secure.phabricator.com/D2174
Fix docs links after D2181 and D2182

Test Plan:
  diviner .

Reviewers: epriestley

Reviewed By: epriestley

CC: aran

Differential Revision: https://secure.phabricator.com/D2189
Make --auto creates actually work in SVN and HG

Summary:
--auto doesn't work right now on the implicit --create pathway in SVN and HG because we hit these conditions.

Also improve a message.

Test Plan: Ran "arc diff" in unaffiliated working copies in HG and SVN.

Reviewers: svemir, btrahan, vrana, jungejason

Reviewed By: svemir

CC: aran

Differential Revision: https://secure.phabricator.com/D2187
Add ArcanistLintSeverity::SEVERITY_AUTOFIX.

Summary:
Xcode (a popular code editor on Mac OS X) has no facility
to trim trailing whitespace automatically.

This adds a new lint severity "AUTOFIX" that's between
WARNING and ERROR. When running the linter, any lint message
whose severity is AUTOFIX will automatically be patched.

Furthermore, if all lint messages returned from the engine are
AUTOFIX, we'll automatically amend HEAD with the patch.

Test Plan:
arc lint on files with and without trailing whitespace,
with and without UTF-8 contents to confirm those still error

Reviewers: epriestley, jungejason

Reviewed By: epriestley

CC: aran

Differential Revision: https://secure.phabricator.com/D2125
Allow defining aliases in .arcconfig.

Summary:
For Objective-C repositories, we want to provide aliases to
arc diff --amend-autofixes by default.

This adds the ability to define aliases in .arcconfig (overridden
by any specified in the user config, of course).

Test Plan:
Tested defining alias with nothing in .arcconfig, with
an alias in .arcconfig.  Tested arc alias outside of working
repository.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran

Differential Revision: https://secure.phabricator.com/D2191
If a Git upstream is configured for the current branch, always use that as the default relative commit

Summary: See discussion in D1861.

Test Plan: Ran "arc diff" on master, got an upstream-based relative commit. Ran "arc diff" on a feature branch, got a config-based relative commit. Ran "arc diff x", got an argument-based relative commit.

Reviewers: btrahan, vrana, davidreuss, elgenie

Reviewed By: davidreuss

CC: aran

Differential Revision: https://secure.phabricator.com/D2192
Don't let "arc which" identify the working copy as belonging to a different project

Summary: If you have two projects (say, libphutil and arcanist) and you prepare a patch for one of them on branch "master", run "arc diff", and then prepare a patch for the other one on the same branch, "arc diff" will try to update the first revision when you run it. Instead, make it smart enough to stay within arc projects.

Test Plan: Ran "arc which" in circumstances where it previously generated a false positive, no false positive.

Reviewers: btrahan, vrana, jungejason

Reviewed By: jungejason

CC: aran

Maniphest Tasks: T1100

Differential Revision: https://secure.phabricator.com/D2199
Read default relative commit from scratch file with newline

Summary:
When people create the .arc/default-relative-commit scratchfile with $EDITOR of
choice, their editor usually puts a newline at the end, which breaks arc diff.
We should trim the newline before using the contents of the scratchfile.

Test Plan:
ran arc diff in a working copy that contained a .arc/default-relative-commit
with a newline

Reviewers: epriestley, jungejason

Reviewed By: epriestley

CC: aran

Differential Revision: https://secure.phabricator.com/D2209
Fix some --only / --preview / SVN issues with Arcanist

Summary:
  - Historically, "--preview" was forbidden under SVN. No reason for that now.
  - The "--auto" patch moved the "--preview" / "--only" checks later than they should be.
  - Fix an issue with Conduit query construction in SVN.

Test Plan: Ran "arc diff --preview" in an SVN working copy. Ran "arc diff" in an SVN working copy.

Reviewers: svemir, btrahan, vrana, jungejason

Reviewed By: svemir

CC: aran

Differential Revision: https://secure.phabricator.com/D2218
Drop <project + branch> herusitic from Git

Summary: See rage in T1117. Don't use the <project + branch> heuristic anymore..

Test Plan: Ran "arc diff --strict HEAD^" on a commit stacked on top of this one, got no matches.

Reviewers: btrahan, vrana, simpkins, beng

Reviewed By: btrahan

CC: aran, avive

Maniphest Tasks: T1117

Differential Revision: https://secure.phabricator.com/D2221