D9854.diff
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D9854.diff
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	diff --git a/src/repository/api/ArcanistGitAPI.php b/src/repository/api/ArcanistGitAPI.php
	--- a/src/repository/api/ArcanistGitAPI.php
	+++ b/src/repository/api/ArcanistGitAPI.php
	@@ -1213,4 +1213,12 @@
	$this->resolvedHeadCommit = null;
	}

	+ public function setSingleCommit($symbolic_commit) {
	+ list($parent) = $this->execxLocal(
	+ 'rev-list %s --skip=1 --max-count=1', $symbolic_commit);
	+ $parent = rtrim($parent, "\n");
	+ $this->setBaseCommit($parent);
	+ $this->setHeadCommit($symbolic_commit);
	+ }
	+
	}
	diff --git a/src/workflow/ArcanistDiffWorkflow.php b/src/workflow/ArcanistDiffWorkflow.php
	--- a/src/workflow/ArcanistDiffWorkflow.php
	+++ b/src/workflow/ArcanistDiffWorkflow.php
	@@ -182,6 +182,15 @@
	'never-apply-patches' => '--nolint suppresses lint.',
	),
	),
	+ 'commit' => array(
	+ 'param' => 'revision_id',
	+ 'help' => 'Single commit to generate diff from.',
	+ 'conflicts' => array(
	+ '--base' => '--commit suppresses --base.',
	+ '--head' => '--commit suppresses --head.'
	+ ),
	+ 'supports' => array('git'),
	+ ),
	'only' => array(
	'help' =>
	'Only generate a diff, without running lint, unit tests, or other '.
	@@ -450,6 +459,10 @@
	}

	$repo = $this->getRepositoryAPI();
	+ if ($this->getArgument('commit')) {
	+ $repo->setSingleCommit($this->getArgument('commit'));
	+ }
	+
	$head_commit = $this->getArgument('head');
	if ($head_commit !== null) {
	$repo->setHeadCommit($head_commit);