build(aio): ability to generate zips

aio/tools/example-zipper/customizer/package-json/packageJsonCustomizer.js

@@ -0,0 +1,55 @@
+'use strict';
+
+const path = require('canonical-path');
+
+const examplesPath = path.resolve(__dirname, '../../../examples');
+const packageFolder = path.resolve(__dirname);
+
+class PackageJsonCustomizer {
+  constructor() {
+    this.dependenciesPackageJson = require(path.join(examplesPath, '/shared/package.json'));
+    this.scriptsPackageJson = require(path.join(examplesPath, '/shared/boilerplate/package.json'));
+    this.basePackageJson = require(`${packageFolder}/base.json`);
+  }
+
+  generate(type = 'systemjs') {
+    let packageJson = require(`${packageFolder}/package.json`);
+    let rules = require(`${packageFolder}/${type}.json`);
+
+    this._mergeJSON(rules, this.basePackageJson);
+
+    rules.scripts.forEach((r) => {
+      const scriptName = r.name;
+      const script = this.scriptsPackageJson.scripts[scriptName];
+      const finalName = r.rename ? r.rename : r.name;
+      const finalScript = r.command ? r.command : script;
+      packageJson.scripts[finalName] = finalScript;
+    });
+
+    rules.dependencies.forEach((name) => {
+      const version = this.dependenciesPackageJson.dependencies[name];
+      packageJson.dependencies[name] = version;
+    });
+
+    rules.devDependencies.forEach((name) => {
+      const version = this.dependenciesPackageJson.devDependencies[name];
+      packageJson.devDependencies[name] = version;
+    });
+
+    return JSON.stringify(packageJson, null, 2);
+  }
+
+  _mergeJSON(json1,json2) {
+    var result = json1 ;
+    for (var prop in json2)
+    {
+        if (json2.hasOwnProperty(prop))
+        {
+            result[prop] = (result[prop].concat(json2[prop])).sort();
+        }
+    }
+    return result;
+  }
+}
+
+module.exports = PackageJsonCustomizer;