ArcanistScalaSBTLinter.php
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	<?php

	/**
	* Uses `sbt compile` to detect various warnings/errors in Scala code.
	*
	* @group linter
	*/
	final class ArcanistScalaSBTLinter extends ArcanistLinter {

	public function willLintPaths(array $paths) {
	return;
	}

	public function getLinterName() {
	return 'ScalaSBT';
	}

	public function getLintSeverityMap() {
	return array();
	}

	public function getLintNameMap() {
	return array();
	}

	public function canRun() {
	// Check if this looks like a SBT project. If it doesn't, throw, because
	// we rely fairly heavily on `sbt compile` working, below. We don't want
	// to call out to scalac ourselves, because then we'll end up in Class Path
	// Hell. We let the build system handle this for us.
	if (!Filesystem::pathExists('project/Build.scala') &&
	!Filesystem::pathExists('build.sbt')) {
	return false;
	}
	return true;
	}

	private function getSBTPath() {
	$sbt_bin = "sbt";

	// Use the SBT prefix specified in the config file
	$working_copy = $this->getEngine()->getWorkingCopy();
	$prefix = $working_copy->getConfig('lint.scala_sbt.prefix');
	if ($prefix !== null) {
	$sbt_bin = $prefix . $sbt_bin;
	}

	if (!Filesystem::pathExists($sbt_bin)) {

	list($err) = exec_manual('which %s', $sbt_bin);
	if ($err) {
	throw new ArcanistUsageException(
	"SBT does not appear to be installed on this system. Install it or ".
	"add 'lint.scala_sbt.prefix' in your .arcconfig to point to ".
	"the directory where it resides.");
	}
	}

	return $sbt_bin;
	}

	private function getMessageCodeSeverity($type_of_error) {
	switch ($type_of_error) {
	case 'warn':
	return ArcanistLintSeverity::SEVERITY_WARNING;
	case 'error':
	return ArcanistLintSeverity::SEVERITY_ERROR;
	}
	}

	public function lintPath($path) {
	$sbt = $this->getSBTPath();

	// Tell SBT to not use color codes so our regex life is easy.
	// TODO: Should this be "clean compile" instead of "compile"?
	$f = new ExecFuture("%s -Dsbt.log.noformat=true compile", $sbt);
	list($err, $stdout, $stderr) = $f->resolve();

	$lines = explode("\n", $stdout);
	$messages = array();
	foreach ($lines as $line) {
	$matches = null;
	if (!preg_match(
	"/\[(warn\|error)\] (.?):(\d+): (.?)$/",
	$line,
	$matches)) {
	continue;
	}
	foreach ($matches as $key => $match) {
	$matches[$key] = trim($match);
	}

	$message = new ArcanistLintMessage();
	$message->setPath($matches[2]);
	$message->setLine($matches[3]);
	$message->setCode($this->getLinterName());
	$message->setDescription($matches[4]);
	$message->setSeverity($this->getMessageCodeSeverity($matches[1]));
	$this->addLintMessage($message);
	}
	}

	}

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