First Release

.gitignore

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+node_modules/
+test/
+build/
+package-lock.json

gulpfile.js

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+'use strict';
+
+const gulp = require('gulp'),
+      composer = require('gulp-uglify/composer'),
+      zip = require('gulp-zip');
+const del = require('del'),
+      exec = require('child_process').exec,
+      uglifyes = require('uglify-es'),
+      merge = require('event-stream').merge;
+const pkgInfo = require('./package.json'),
+      uglify = composer(uglifyes, console);
+
+gulp.task('clean', () => del(['build/']));
+
+gulp.task('resolve:node-deps', () => exec('cd ./node && npm install && npm update'));
+
+gulp.task('build', ['clean', 'resolve:node-deps'], () => {
+    let copy = gulp.src(['package.json', 'node/node_modules/**/*'], {base: '.'}).pipe(gulp.dest('build'));
+    let minify = gulp.src(['main.js', 'node/*.js'], {base: '.'})
+                     .pipe(uglify({}))
+                     .pipe(gulp.dest('build'));
+
+    return merge(copy, minify).on('end', () =>
+            gulp.src('build/**/*', {base: 'build'})
+                .pipe(zip(`${pkgInfo.name}-${pkgInfo.version}.zip`))
+                .pipe(gulp.dest('build/dist')));
+});
+
+gulp.task('default', ['build']);

main.js

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+/*jslint vars: true, plusplus: true, devel: true, nomen: true, indent: 4, maxerr: 50 */
+/*global define, brackets, $ */
+
+define(function (require, exports, module) {
+    'use strict';
+
+    const NodeDomain = brackets.getModule('utils/NodeDomain'),
+        ExtensionUtils = brackets.getModule('utils/ExtensionUtils'),
+        CodeInspection = brackets.getModule('language/CodeInspection'),
+        AppInit = brackets.getModule('utils/AppInit'),
+        Menus = brackets.getModule('command/Menus'),
+        CommandManager = brackets.getModule('command/CommandManager'),
+        DocumentManager = brackets.getModule('document/DocumentManager');
+
+    const w3cvalidatorSever = new NodeDomain('w3cvalidator', ExtensionUtils.getModulePath(module, 'node/ValidationServer'));
+
+    const COMMAND_ID = 'w3cvalidator.refresh',
+        PROVIDER_ID = 'w3cvalidator';
+
+    //var Strings = require("strings");
+
+    /**
+     * Validation Server launcher in standalone
+     */
+    function runServer() {
+        w3cvalidatorSever.exec('runServer');
+    }
+
+    /**
+     * Validation handler as a client
+     */
+    function handleValidation(text, fullPath) {
+        let response = $.Deferred();
+        let result = {
+            errors: []
+        };
+
+        $.ajax({
+            url: "http://localhost:8888/?out=json",
+            type: 'POST',
+            contentType: 'text/html; charset=utf-8',
+            data: text,
+            cache: false,
+            processData: false
+        }).done(function (data, textStatus, jqXHR) {
+            let messages = data.messages;
+
+            if (messages.length) {
+                messages.forEach(function (item) {
+                    let type;
+                    switch (item.type) {
+                        case 'warning':
+                            type = CodeInspection.Type.WARNING;
+                            break;
+                        case 'error':
+                            type = CodeInspection.Type.ERROR;
+                            break;
+                    }
+
+                    result.errors.push({
+                        pos: {
+                            line: item.lastLine - 1,
+                            ch: 0
+                        },
+                        message: item.message,
+                        type: type
+                    });
+                });
+            }
+
+            response.resolve(result);
+        });
+
+        return response.promise();
+    }
+
+    // Listen a file saved event
+    function refreshValidation() {
+        DocumentManager.getCurrentDocument().notifySaved();
+    }
+
+    // Register the HTML Linting
+    AppInit.appReady(function () {
+        CodeInspection.register("html", {
+            name: PROVIDER_ID,
+            scanFileAsync: handleValidation
+        });
+    });
+
+    // Command
+    //CommandManager.register(Strings.REFRESH_W3C_VALIDATION, COMMAND_ID, _refreshValidation);
+    CommandManager.register("Refresh W3C validation", COMMAND_ID, refreshValidation);
+
+    // Menu
+    const editMenu = Menus.getMenu(Menus.AppMenuBar.EDIT_MENU);
+    editMenu.addMenuItem(COMMAND_ID, "F9");
+
+    // Server launcher when extension is loaded
+    runServer();
+});

node/ValidationServer.js

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+/*jslint vars: true, plusplus: true, devel: true, nomen: true, indent: 4, maxerr: 50, node: true */
+/*global $, require */
+
+(function () {
+    'use strict';
+
+    const exec = require('child_process').exec,
+          vnu = require('vnu-jar');
+
+    /**
+     * @private
+     * Handler function for the w3cvalidator.validate command.
+     */
+    function runServer() {
+        exec(`java -Xss1m -cp ${vnu} nu.validator.servlet.Main 8888`);
+    }
+
+    /**
+     * Initializes the test domain with several test commands.
+     * @param {DomainManager} domainManager The DomainManager for the server
+     */
+    function init(domainManager) {
+        if (!domainManager.hasDomain('w3cvalidator')) {
+            domainManager.registerDomain('w3cvalidator', {
+                major: 0,
+                minor: 1
+            });
+        }
+
+        domainManager.registerCommand(
+            'w3cvalidator',
+            'runServer',
+            runServer,
+            false,
+            'Runs the validation server in standalone.'
+        );
+    }
+
+    exports.init = init;
+}());

node/package.json

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+{
+    "private": true,
+    "dependencies": {
+        "vnu-jar": "latest"
+    }
+}

node/w3cvalidator.js

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+/*jslint vars: true, plusplus: true, devel: true, nomen: true, indent: 4, maxerr: 50, node: true */
+/*global */
+
+(function () {
+    'use strict';
+
+    const exec = require('child_process').execSync,
+          vnu = require('vnu-jar');
+
+    /**
+     * @private
+     * Handler function for the w3cvalidator.validate command.
+     * @param {string} the file path for verification
+     * @return {string} the validation report
+     */
+    function validate(path) {
+        exec(`java -Xss2m -jar ${vnu} --format text --skip-non-html ${path}`, (error, stdout, stderr) => {
+            console.log('stdout: ' + stdout);
+            console.log('stderror: ' + stderr);
+
+            return stderr;
+        });
+    }
+
+    /**
+     * Initializes the test domain with several test commands.
+     * @param {DomainManager} domainManager The DomainManager for the server
+     */
+    function init(domainManager) {
+        if (!domainManager.hasDomain('w3cvalidator')) {
+            domainManager.registerDomain('w3cvalidator', {
+                major: 0,
+                minor: 1
+            });
+        }
+
+        domainManager.registerCommand(
+            'w3cvalidator',
+            'validate',
+            validate,
+            true,
+            'Returns the validation report of a file', [{
+                name: 'path',
+                type: 'string',
+                description: 'the file path for verification'
+            }], [{
+                name: 'report',
+                type: 'string',
+                description: 'validation report in JSON format'
+            }]
+        );
+    }
+
+    exports.init = init;
+}());

package.json

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+{
+    "name": "umoxfo.w3cvalidation",
+    "title": "W3C Validation (by Umoxfo)",
+    "version": "1.0.0",
+    "description": "Adds W3C validation support to Brackets.",
+    "homepage": "",
+    "keywords": [
+        "html",
+        "lint",
+        "linting",
+        "linter"
+    ],
+    "categories": "linting",
+    "author": "Makoto Sakaguchi <ycco34vx@gmail.com>",
+    "license": "MIT",
+    "engines": {
+        "brackets": ">=0.24.0"
+    },
+    "devDependencies": {
+        "gulp": "latest",
+        "gulp-uglify": "latest",
+        "gulp-zip": "latest",
+        "del": "latest",
+        "uglify-es": "latest",
+        "event-stream": "latest"
+    }
+}