bug(help): hide ember-cli commands when running help

Fixes: #1807

Author: Brocco

addon/ng2/commands/help.ts

@@ -0,0 +1,57 @@
+import * as fs from 'fs';
+import * as path from 'path';
+
+const Command = require('ember-cli/lib/models/command');
+const EmberHelpCommand = require('ember-cli/lib/commands/help');
+const stringUtils = require('ember-cli-string-utils');
+const lookupCommand = require('ember-cli/lib/cli/lookup-command');
+
+const commandsToIgnore = [
+  'help',
+  'easter-egg',
+  'completion',
+  'github-pages-deploy'
+]
+
+const HelpCommand = Command.extend({
+  name: 'help',
+  description: 'Shows help for the CLI',
+  works: 'outsideProject',
+
+  availableOptions: [],
+
+  run: function (commandOptions: any) {
+    let commandFiles = fs.readdirSync(__dirname)
+      .map(file => path.parse(file).name)
+      .map(file => file.toLowerCase());
+
+    commandFiles = commandFiles.filter(file => {
+      return commandsToIgnore.indexOf(file) < 0;
+    });
+
+    let commandMap = commandFiles.reduce((acc: any, curr: string) => {
+      let classifiedName = stringUtils.classify(curr);
+      let defaultImport = require(`./${curr}`).default
+
+      acc[classifiedName] = defaultImport;
+
+      return acc;
+    }, {});
+
+    commandFiles.forEach(cmd => {
+      let Command = lookupCommand(commandMap, cmd);
+
+      let command = new Command({
+        ui: this.ui,
+        project: this.project,
+        commands: this.commands,
+        tasks: this.tasks
+      });
+
+      this.ui.writeLine(command.printBasicHelp(commandOptions));
+    })
+  }
+});
+
+HelpCommand.overrideCore = true;
+export default HelpCommand;

addon/ng2/index.js

@@ -16,6 +16,7 @@ module.exports = {
       'serve': require('./commands/serve').default,
       'new': require('./commands/new').default,
       'generate': require('./commands/generate').default,
+      'help': require('./commands/help').default,
       'init': require('./commands/init').default,
       'test': require('./commands/test').default,
       'e2e': require('./commands/e2e').default,