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PythonIsortLinter.php
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PythonIsortLinter.php
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<?php
/**
* Copyright 2018 Pinterest, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Lints Python imports using `isort`.
*/
final class PythonIsortLinter extends ArcanistExternalLinter {
const LINT_STYLE = 1;
public function getInfoName() {
return 'isort';
}
public function getInfoDescription() {
return pht('isort is a Python utility to sort imports.');
}
public function getInfoURI() {
return 'https://github.com/timothycrosley/isort';
}
public function getLinterName() {
return 'ISORT';
}
public function getLinterConfigurationName() {
return 'isort';
}
public function getDefaultBinary() {
return 'isort';
}
public function getVersion() {
list($err, $stdout, $stderr) = exec_manual(
'%C --version-number',
$this->getExecutableCommand());
$matches = array();
if (preg_match('/^(?P<version>\d+\.\d+\.\d+)$/', $stdout, $matches)) {
return $matches['version'];
} else {
return false;
}
}
public function getInstallInstructions() {
return pht('Install isort using `pip install isort`.');
}
protected function getMandatoryFlags() {
return array('--quiet', '--check-only', '--diff', '--');
}
protected function getDefaultMessageSeverity($code) {
return ArcanistLintSeverity::SEVERITY_AUTOFIX;
}
protected function parseLinterOutput($path, $err, $stdout, $stderr) {
if (empty($stdout)) {
return array();
}
// Expected output includes a single header optionally followed by a
// multiline diff. We're only interested in the latter case (which implies
// a lint violation), but we could also parse the header for more detailed
// information if we need that later.
list($header, $diff) = explode("\n", $stdout, 2);
if (empty($diff)) {
return array();
}
$messages = array();
$parser = new ArcanistDiffParser();
$changes = $parser->parseDiff($diff);
foreach ($changes as $change) {
foreach ($change->getHunks() as $hunk) {
$repl = array();
$orig = array();
$lines = phutil_split_lines($hunk->getCorpus(), false);
foreach ($lines as $line) {
if (empty($line)) {
continue;
}
$char = $line[0];
$rest = substr($line, 1);
// We *could* differentiate between different kinds of violations
// here (sorting, missing blank lines, too many blank lines), but
// for now we just classify the entire chunk as a single generic
// "style" issue.
switch ($char) {
case '-':
$orig[] = $rest;
break;
case '+':
$repl[] = $rest;
break;
case '~':
break;
case ' ':
$orig[] = $rest;
$repl[] = $rest;
break;
}
}
$messages[] = id(new ArcanistLintMessage())
->setPath($path)
->setLine($hunk->getOldOffset())
->setChar(1)
->setCode($this->getLinterName())
->setSeverity($this->getLintMessageSeverity(self::LINT_STYLE))
->setName('Python imports style')
->setOriginalText(join("\n", $orig))
->setReplacementText(join("\n", $repl));
}
}
if ($err && !$messages) {
return false;
}
return $messages;
}
}

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