Initial version.

.editorconfig

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+# editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitignore

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+.DS_Store
+node_modules
+
+coverage
+npm-debug.log

.travis.yml

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+sudo: required
+dist: trusty
+language: node_js
+node_js:
+  - "4"
+  - "5"
+  - "6"
+before_install:
+  - sudo apt-get -y install python3-pip python-dev
+  - sudo pip3 install -U setuptools
+  - python3 -V
+  - pip3 -V
+install:
+  - npm install
+  - sudo pip3 install isort
+after_script:
+  - npm run coveralls

LICENSE

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+The MIT License (MIT)
+Copyright (c) 2016 Sophilabs
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Gulp Isort
+
+[![travis][travis-image]][travis-url]
+[![coverage][coveralls-image]][coveralls-url]
+[![npm][npm-image]][npm-url]
+[![downloads][downloads-image]][downloads-url]
+[![js-semistandard-style][semi-image]][semi-url]
+[![license][license-image]][license-url]
+[![dependencies][dependencies-image]][dependencies-url]
+[![dev-dependencies][dev-dependencies-image]][dev-dependencies-url]
+
+Gulp task for isort.
+
+## Installation
+
+```bash
+npm install gulp-isort
+```
+
+## License
+
+Gulp Isort is Copyright (c) 2016 sophilabs, inc. It is free software, and may be
+redistributed under the terms specified in the [license] file.
+
+## About
+
+[![sophilabs][sophilabs-image]][sophilabs-url]
+
+Gulp Isort is maintained and funded by sophilabs, inc. The names and logos for
+sophilabs are trademarks of sophilabs, inc.
+
+[license]: /LICENSE
+[sophilabs-image]: https://res.cloudinary.com/jsconfuy/image/upload/c_pad,f_auto,h_200,w_200,e_trim/v1426608244/xuwbunompvfjaxuazlwo.png
+[sophilabs-url]: https://sophilabs.co
+[travis-image]: https://img.shields.io/travis/sophilabs/gulp-isort.svg?style=flat-square
+[travis-url]: https://travis-ci.org/sophilabs/gulp-isort
+[npm-image]: https://img.shields.io/npm/v/gulp-isort.svg?style=flat-square
+[npm-url]: https://npmjs.org/packge/gulp-isort
+[downloads-image]: https://img.shields.io/npm/dm/gulp-isort.svg?style=flat-square
+[downloads-url]: https://npmjs.org/package/gulp-isort
+[semi-image]: https://img.shields.io/badge/code%20style-semistandard-brightgreen.svg?style=flat-square
+[semi-url]: https://github.com/Flet/semistandard
+[coveralls-image]: https://img.shields.io/coveralls/sophilabs/gulp-isort.svg?style=flat-square
+[coveralls-url]: https://coveralls.io/github/sophilabs/gulp-isort?branch=master
+[license-image]: https://img.shields.io/github/license/sophilabs/gulp-isort.svg?style=flat-square
+[license-url]: /LICENSE
+[dependencies-image]: https://david-dm.org/sophilabs/gulp-isort.svg?style=flat-square
+[dependencies-url]: https://david-dm.org/sophilabs/gulp-isort
+[dev-dependencies-image]: https://david-dm.org/sophilabs/gulp-isort/dev-status.svg?style=flat-square
+[dev-dependencies-url]: https://david-dm.org/sophilabs/gulp-isort#info=devDependencies

lib/index.js

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+'use strict';
+var util = require('util');
+var path = require('path');
+var gutil = require('gulp-util');
+var through = require('through2');
+var cp = require('child_process');
+
+function gulpIsort(opts) {
+  opts = opts || {};
+
+  return through.obj(function (file, enc, cb) {
+    if (file.isNull()) {
+      cb(null, file);
+      return;
+    } else if (file.isStream()) {
+      cb(new gutil.PluginError('gulp-isort', 'Streaming not supported'));
+      return;
+    }
+    file.isort = {};
+    var isort = cp.spawn('isort', ['-c', '-']);
+    isort.stdout.on('data', function (data) {
+      file.isort.errors = util.format('%s\n%s', file.path, data.toString().trim());
+    });
+    isort.on('exit', function (code) {
+      cb(null, file);
+    });
+    isort.stdin.write(file.contents);
+    isort.stdin.end();
+  });
+};
+
+gulpIsort.failOnError = function() {
+  return through.obj(function (file, enc, cb) {
+    if (!file.isort || !file.isort.errors) {
+      cb(null, file);
+      return;
+    }
+    cb(new gutil.PluginError(
+      'gulp-isort',
+      {
+        name: 'IsortError',
+        message: file.isort.errors
+      }
+    ));
+  });
+};
+
+module.exports = gulpIsort;

package.json

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+{
+  "name": "gulp-isort",
+  "version": "0.0.1",
+  "description": "Gulp plugin for Isort.",
+  "main": "lib/index.js",
+  "directories": {
+    "test": "test"
+  },
+  "scripts": {
+    "test": "istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec $(find ./test -name *.tests.js) && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage",
+    "lint": "semistandard *.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/sophilabs/gulp-isort.git"
+  },
+  "keywords": [
+    "isort",
+    "python",
+    "gulpplugin"
+  ],
+  "author": "Sophilabs",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/sophilabs/gulp-isort/issues"
+  },
+  "homepage": "https://github.com/sophilabs/gulp-isort#readme",
+  "dependencies": {
+    "gulp-util": "^3.0.7",
+    "through2": "^2.0.1"
+  },
+  "devDependencies": {
+    "coveralls": "^2.11.9",
+    "istanbul": "^0.4.4",
+    "mocha": "^2.5.3",
+    "semistandard": "^8.0.0",
+    "should": "^9.0.2",
+    "vinyl": "^1.1.1"
+  }
+}

test/index.tests.js

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+'use strict';
+
+var gulpIsort = require('../lib');
+var should = require('should');
+var File = require('vinyl');
+
+require('mocha');
+
+describe('gulp-isort failOnError', function() {
+  it('should fail a file immediately if an error is found', function(done) {
+    var lintStream = gulpIsort();
+
+    function endWithoutError() {
+      done(new Error('An error was not thrown before ending'));
+    }
+
+    lintStream.pipe(gulpIsort.failOnError())
+    .on('error', function(err) {
+      this.removeListener('finish', endWithoutError);
+      should.exists(err);
+      err.message.should.equal('test/fixtures/invalid.py\nERROR:  Imports are incorrectly sorted.');
+      err.plugin.should.equal('gulp-isort');
+      done();
+    })
+    .on('finish', endWithoutError);
+
+    lintStream.write(new File({
+      path: 'test/fixtures/invalid.py',
+      contents: new Buffer('import b\nimport a')
+    }));
+
+    lintStream.end();
+  });
+});