chore(gen): make sure users are using yo >= 1.7.1

Author: Awk34

src/generators/app/index.js

@@ -39,7 +39,7 @@ export class Generator extends Base {
         this.filters = {};
 
         // init shared generator properies and methods
-        genBase(this);
+        const genBasePromise = genBase(this);
 
         insight.track('generator', this.rootGeneratorVersion());
         this.nodeVersion = semver.clean(process.version);
@@ -53,10 +53,12 @@ export class Generator extends Base {
           insight.askPermission(null, cb);
         }
 
-        return runCmd('npm --version').then(stdout => {
+        const npmVersionPromise = runCmd('npm --version').then(stdout => {
           this.npmVersion = stdout.toString().trim();
           return insight.track('npm', this.npmVersion);
         });
+
+        return Promise.all([genBasePromise, npmVersionPromise]);
       },
       info: function () {
         this.log(this.yoWelcome);

src/generators/generator-base.js

@@ -4,6 +4,7 @@ import util from 'util';
 import path from 'path';
 import lodash from 'lodash';
 import s from 'underscore.string';
+import semver from 'semver';
 import yoWelcome from 'yeoman-welcome';
 import * as genUtils from './util';
 
@@ -13,6 +14,12 @@ lodash.mixin(s.exports());
 export function genBase(self) {
   self = self || this;
 
+  let yoCheckPromise = genUtils.runCmd('yo --version').then(stdout => {
+    if(!semver.satisfies(semver.clean(stdout), '>= 1.7.1')) {
+      throw new Error('ERROR: You need to update yo to at least 1.7.1 (npm i -g yo)');
+    }
+  });
+
   self.lodash = lodash;
   self.yoWelcome = yoWelcome;
 
@@ -46,19 +53,21 @@ export function genBase(self) {
   self.processDirectory = genUtils.processDirectory.bind(self);
   // rewrite a file in place
   self.rewriteFile = genUtils.rewriteFile;
+
+  return yoCheckPromise;
 }
 
 export function genNamedBase(self) {
   self = self || this;
 
   // extend genBase
-  genBase(self);
-
-  var name = self.name.replace(/\//g, '-');
+  return genBase(self).then(() => {
+    var name = self.name.replace(/\//g, '-');
 
-  self.cameledName = lodash.camelize(name);
-  self.classedName = lodash.classify(name);
+    self.cameledName = lodash.camelize(name);
+    self.classedName = lodash.classify(name);
 
-  self.basename = path.basename(self.name);
-  self.dirname = (self.name.indexOf('/') >= 0) ? path.dirname(self.name) : self.name;
+    self.basename = path.basename(self.name);
+    self.dirname = (self.name.indexOf('/') >= 0) ? path.dirname(self.name) : self.name;
+  });
 }