fix: override ui write level

This method is more reliable than using regexes on
the input/output streams.

Fix angular#2540

Author: filipesilva

packages/angular-cli/lib/cli/index.js

@@ -2,44 +2,25 @@
 
 // This file hooks up on require calls to transpile TypeScript.
 const cli = require('ember-cli/lib/cli');
+const UI = require('ember-cli/lib/ui');
 const path = require('path');
 
 Error.stackTraceLimit = Infinity;
 
 module.exports = function(options) {
-  const oldStdoutWrite = process.stdout.write;
-  process.stdout.write = function (line) {
-    line = line.toString();
-    if (line.match(/version:|WARNING:/)) {
-      return;
-    }
-    if (line.match(/ember-cli-(inject-)?live-reload/)) {
-      // don't replace 'ember-cli-live-reload' on ng init diffs
-      return oldStdoutWrite.apply(process.stdout, arguments);
-    }
-    line = line.replace(/ember-cli(?!.com)/g, 'angular-cli')
-      .replace(/\bember\b(?!-cli.com)/g, 'ng');
-    return oldStdoutWrite.apply(process.stdout, arguments);
-  };
 
-  const oldStderrWrite = process.stderr.write;
-  process.stderr.write = function (line) {
-    line = line.toString()
-      .replace(/ember-cli(?!.com)/g, 'angular-cli')
-      .replace(/\bember\b(?!-cli.com)/g, 'ng');
-    return oldStderrWrite.apply(process.stdout, arguments);
-  };
+  // patch UI to not print Ember-CLI warnings (which don't apply to Angular-CLI)
+  UI.prototype.writeWarnLine = function () { }
 
   options.cli = {
     name: 'ng',
     root: path.join(__dirname, '..', '..'),
-    npmPackage: 'angular-cli'
+    npmPackage: 'angular-cli',
+    ui: UI
   };
 
   // ensure the environemnt variable for dynamic paths
   process.env.PWD = process.env.PWD || process.cwd();
-
-
   process.env.CLI_ROOT = process.env.CLI_ROOT || path.resolve(__dirname, '..', '..');
 
   return cli(options);