feat(generators/app): safe-guard against running in non-empty destina…

…tion roots
marviq · Oct 11, 2017 · 6969a74 · 6969a74
1 parent c862fba
commit 6969a74
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Showing 2 changed files with 37 additions and 1 deletion.
diff --git a/generators/app/index.js b/generators/app/index.js
@@ -167,6 +167,21 @@ class AppGenerator extends Generator
                 [
                     {
                         type:       'input'
+                    ,   name:       'iKnowWhatImDoing'
+                    ,   message:    chalk.redBright(
+                                        chalk.inverse( ' Whoa there!!  It would appear that your target directory is not empty! ' )
+                                    +   '  Type "YES" if you would like to proceed anyway.'
+                                    )
+                    ,   default:    ''
+                    ,   validate:   ( iKnowWhatImDoing ) =>
+                                    {
+                                        if ( 'YES' === iKnowWhatImDoing ) { return true; }
+                                        this.env.error( 'Bailing out' );
+                                    }
+                    ,   when:       !( this._isRootSafe() )
+                    }
+                 ,  {
+                        type:       'input'
                     ,   name:       'packageName'
                     ,   message:    (
                                         'What is the name of this '

diff --git a/lib/generator.js b/lib/generator.js
@@ -41,7 +41,6 @@ module.exports =
          *  @param      {Array}         prompts     An array of prompt definitions as would be passed to `this.prompt()`.
          *
          *  @return     {Array}                     The prompts for which no valid value has been supplied through a command line option.
-         *
          */
 
         _promptsPruneByOptions: function ( prompts )
@@ -188,5 +187,27 @@ module.exports =
                 }
             );
         }
+
+    ,
+        /**
+         *  Test whether the destination root is safely empty for generating an app in.
+         *
+         *  @method     _isRootSafe
+         *
+         *  @return     {Boolean                    Whether the destination root is safely empty for generating an app in.
+         */
+
+        _isRootSafe: function ()
+        {
+            var root    = this.destinationRoot()
+            ,   entries = fsCore.readdirSync( root )
+            ,   safe    =
+                [
+                    '.git'
+                ]
+            ;
+
+            return 0 === _.difference( entries, safe ).length;
+        }
     }
 ;