Use "-b", not "--branch", when issuing "hg log" in Phabricator

Summary:
Mercurial renamed "--only-branch" to "--branch" about two years ago. "-b" exists in both versions.

http://www.selenic.com/pipermail/mercurial-devel/2010-April/020469.html

We have a few other cases where we use features that exist only in recent Mercurial (notably, 'ancestors' in log) but we can work around this one easily.

Test Plan: Looked at a Mercurial repo in Diffusion, verified that "log -b" commands issued and that the output was correct.

Reviewers: btrahan, Makinde, ipalaus

Reviewed By: ipalaus

CC: aran

Maniphest Tasks: T1264

Differential Revision: https://secure.phabricator.com/D2533

src/applications/diffusion/query/history/mercurial/DiffusionMercurialHistoryQuery.php

@@ -32,8 +32,9 @@ final class DiffusionMercurialHistoryQuery extends DiffusionHistoryQuery {
     // in the log).
     $default_path = '';
 
+    // NOTE: --branch used to be called --only-branch; use -b for compatibility.
     list($stdout) = $repository->execxLocalCommand(
-      'log --debug --template %s --limit %d --branch %s --rev %s:0 -- %s',
+      'log --debug --template %s --limit %d -b %s --rev %s:0 -- %s',
       '{node};{parents}\\n',
       ($this->getOffset() + $this->getLimit()), // No '--skip' in Mercurial.
       $drequest->getBranch(),

src/applications/diffusion/query/lastmodified/mercurial/DiffusionMercurialLastModifiedQuery.php

@@ -27,7 +27,7 @@ final class DiffusionMercurialLastModifiedQuery
 
     // TODO: Share some of this with History query.
     list($hash) = $repository->execxLocalCommand(
-      'log --template %s --limit 1 --branch %s --rev %s:0 -- %s',
+      'log --template %s --limit 1 -b %s --rev %s:0 -- %s',
       '{node}',
       $drequest->getBranch(),
       $drequest->getCommit(),