Add project files

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = tab
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[{*.json,*.yml,*.yaml}]
+indent_size = 2
+indent_style = space

.github/workflows/lint.yml

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+name: Lint
+on:
+  push:
+    branches: [master]
+  pull_request:
+    types: [opened, synchronize]
+jobs:
+  lint:
+    name: Run ESLint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
+        with:
+          node-version: '12.x'
+      - run: npm install
+      - run: npm run lint

.gitignore

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+/node_modules/

LICENSE

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+MIT License
+
+Copyright (c) 2020 Alexey
+
+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-html-validate
+
+Validate files with `html-validate`.
+
+## Installation
+
+```sh
+> npm install --save-dev gulp-html-validate
+```
+
+## Usage
+
+```js
+const gulp = require('gulp');
+const htmlvalidate = require('gulp-html-validate');
+
+exports.default = () => gulp.src('index.html').pipe(htmlvalidate());
+```
+
+You can also pass options to the `htmlvalidate` function:
+
+```js
+exports.default = () =>
+	gulp.src('index.html').pipe(
+		htmlvalidate({
+			/* Your options here */
+		})
+	);
+```
+
+### Options
+
+#### format
+
+Any formatter supported by `html-validate` (`stylish` by default).
+
+Type: `string`.
+
+## License
+
+Licensed under the [MIT License](./LICENSE).

index.js

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+const through = require('through2');
+const PluginError = require('plugin-error');
+
+const { HtmlValidate } = require('html-validate');
+const { getFormatter } = require('html-validate/build/cli/formatter');
+
+const pluginName = 'gulp-html-validate';
+const defaultOptions = {
+	format: 'stylish',
+};
+
+module.exports = (options) => {
+	const pluginOptions = options || defaultOptions;
+
+	const htmlvalidate = new HtmlValidate();
+	const formatter = getFormatter(pluginOptions.format);
+
+	return through.obj(function(file, encoding, callback) {
+		if (file.isNull()) {
+			callback(null, file);
+			return;
+		}
+
+		if (file.isStream()) {
+			callback(new PluginError(pluginName, 'Streaming not supported'));
+			return;
+		}
+
+		const result = htmlvalidate.validateFile(file.path);
+
+		if (!result.valid) {
+			const resultOutput = formatter(result);
+
+			this.emit(
+				'error',
+				new PluginError(pluginName, resultOutput, {
+					fileName: file.path,
+					showStack: false,
+				})
+			);
+		}
+
+		callback(null, file);
+	});
+};