D9076.diff
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	diff --git a/src/parser/xhpast/bin/xhpast_parse.php b/src/parser/xhpast/bin/xhpast_parse.php
	--- a/src/parser/xhpast/bin/xhpast_parse.php
	+++ b/src/parser/xhpast/bin/xhpast_parse.php
	@@ -54,10 +54,24 @@
	*/
	function xhpast_get_parser_future($data) {
	if (!xhpast_is_available()) {
	- throw new Exception(xhpast_get_build_instructions());
	+ try {
	+ // Try to build XHPAST automatically. If we can't then just ask the user
	+ // to build it themselves.
	+ xhpast_build();
	+ } catch (CommandException $e) {
	+ throw new Exception(xhpast_get_build_instructions());
	+ }
	}
	$future = new ExecFuture('%s', xhpast_get_binary_path());
	$future->write($data);

	return $future;
	}
	+
	+/**
	+ * @group xhpast
	+ */
	+function xhpast_build() {
	+ $root = phutil_get_library_root('phutil');
	+ execx('%s', $root.'/../scripts/build_xhpast.sh');
	+}