`embark eject-webpack` command

cmd/cmd.js

@@ -18,6 +18,7 @@ class Cmd {
     this.simulator();
     this.test();
     this.reset();
+    this.ejectWebpack();
     this.graph();
     this.upload();
     this.versionCmd();
@@ -280,6 +281,15 @@ class Cmd {
       });
   }
 
+  ejectWebpack() {
+    program
+      .command('eject-webpack')
+      .description(__('copy the default webpack config into your dapp for customization'))
+      .action(function () {
+        embark.ejectWebpack();
+      });
+  }
+
   versionCmd() {
     program
     .command('version')

cmd/cmd_controller.js

@@ -411,6 +411,22 @@ class EmbarkController {
     console.log(__("reset done!").green);
   }
 
+  ejectWebpack() {
+    var fs = require('../lib/core/fs.js');
+    var dappConfig = fs.dappPath('webpack.config.js');
+    var embarkConfig = fs.embarkPath('webpack.config.js');
+    if (fs.existsSync(dappConfig)) {
+      console.error(`${dappConfig} ${__('already exists')}`.bold.red);
+      console.error(__('not overwritten, rename or re/move the file and re-run this command').yellow);
+      process.exit(1);
+    } else {
+      fs.copySync(embarkConfig, dappConfig);
+      console.log(`${embarkConfig}`.green);
+      console.log(__('copied to').dim.green);
+      console.log(`${dappConfig}`.green);
+    }
+  }
+
   upload(options) {
     this.context = options.context || [constants.contexts.upload, constants.contexts.build];