ArcanistHLintLinter.php
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ArcanistHLintLinter.php
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	<?php

	/**
	* Calls `hlint` and parses its results.
	*/
	final class ArcanistHLintLinter extends ArcanistExternalLinter {

	public function getInfoName() {
	return 'HLint';
	}

	public function getInfoURI() {
	return 'https://github.com/ndmitchell/hlint';
	}

	public function getInfoDescription() {
	return pht('HLint is a linter for Haskell code.');
	}

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

	public function getLinterConfigurationName() {
	return 'hlint';
	}

	public function getDefaultBinary() {
	return 'hlint';
	}

	public function getInstallInstructions() {
	return pht('Install hlint with `%s`.', 'cabal install hlint');
	}

	protected function getMandatoryFlags() {
	return array('--json');
	}

	public function getVersion() {
	list($stdout, $stderr) = execx(
	'%C --version', $this->getExecutableCommand());

	$matches = null;
	if (preg_match('@HLint v(.*),@', $stdout, $matches)) {
	return $matches[1];
	}

	return null;
	}

	protected function parseLinterOutput($path, $err, $stdout, $stderr) {
	$json = phutil_json_decode($stdout);
	$messages = array();
	foreach ($json as $fix) {
	if ($fix === null) {
	return;
	}

	$message = new ArcanistLintMessage();
	$message->setCode($this->getLinterName());
	$message->setPath($path);
	$message->setLine($fix['startLine']);
	$message->setChar($fix['startColumn']);
	$message->setName($fix['hint']);
	$message->setOriginalText($fix['from']);
	$message->setReplacementText($fix['to']);

	/* Some improvements may slightly change semantics, so attach
	all necessary notes too. */
	$notes = '';
	foreach ($fix['note'] as $note) {
	$notes .= phutil_console_format(
	' %s: %s.',
	pht('NOTE'),
	trim($note, '"'));
	}

	$message->setDescription(
	pht(
	'In module `%s`, declaration `%s`.',
	$fix['module'],
	$fix['decl']).$notes);

	switch ($fix['severity']) {
	case 'Error':
	$message->setSeverity(ArcanistLintSeverity::SEVERITY_ERROR);
	break;
	case 'Warning':
	$message->setSeverity(ArcanistLintSeverity::SEVERITY_WARNING);
	break;
	default:
	$message->setSeverity(ArcanistLintSeverity::SEVERITY_ADVICE);
	break;
	}

	$messages[] = $message;
	}

	return $messages;
	}
	}

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