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DiffusionMercurialRawDiffQuery.php
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			<?php

			final class DiffusionMercurialRawDiffQuery extends DiffusionRawDiffQuery {

			protected function newQueryFuture() {
			$drequest = $this->getRequest();
			$repository = $drequest->getRepository();

			$commit = $this->getAnchorCommit();

			// If there's no path, get the entire raw diff.
			$path = nonempty($drequest->getPath(), '.');

			$against = $this->getAgainstCommit();
			if ($against === null) {
			// If `$commit` has no parents (usually because it's the first commit
			// in the repository), we want to diff against `null`. This revset will
			// do that for us automatically.
			$against = hgsprintf('(%s^ or null)', $commit);
			}

			$future = $repository->getLocalCommandFuture(
			'diff -U %d --git --rev %s --rev %s -- %s',
			$this->getLinesOfContext(),
			$against,
			hgsprintf('%s', $commit),
			$path);

			return $future;
			}

			}