How to check if directory exists using Yeoman?

Question

I am asking the user for a directory name, and then if the directory exists I want to ask them if they want to archive it. However I am not sure what function I can use inside Yeoman to achieve this. Here is my code.

prompting: function () {
    return this.prompt([{
        type: 'input',
        name: 'project_directory',
        message: 'What is the project directory name?'
    }, {
        type: 'confirm',
        name: 'archive',
        message: 'That project already exists. Do you want to archive it?',
        when: function (answers) {
            var destDir = 'project/' + answers.project_directory.replace(/[^0-9a-zA-Z\-.]/g, "").toLowerCase();
            var fso = new ActiveXObject("Scripting.FileSystemObject");

            //Return true if the folder exists
            return (fso.FolderExists(destDir));
        }
    }]).then(function (answers) {


    }.bind(this));
}

score 3 · Accepted Answer · edited May 23 '17 at 12:34

3

Yeoman doesn't provide any built-in methods to verify if a file or a directory exists.

But Yeoman is just Node.js, it's just JavaScript.

So you actually want to ask how to detect if a directory exist with Node.

edited May 23 '17 at 12:34

Community

1
1

answered Sep 28 '16 at 23:56

Simon Boudrias

42,953
16
99
134

score 1 · Answer 2 · answered May 15 '17 at 23:31

1

If you inherited from Generator, you have this.fs object that has exists() method.

module.exports = class extends Generator {
      /* ... */
  default() {
    this.alreadyCopied = this.fs.exists(this.destination('myfile.txt'));
  }
}

answered May 15 '17 at 23:31

mrmyke

19
1

Fábio Filho · Answer 3 · 2018-02-28T15:03:17.457

Actually, as mentioned by Simon Boudrias, Yeoman doesn't provide a built-in method for it, but you can do the following:

var Generator = require('yeoman-generator');
var fs = require('fs');

module.exports = class extends Generator{

    checkIfFolderExists(){    

        fs.stat('YourDirectoryHere'), function(error, stats){            

        if(stats!=undefined && stats.isDirectory()){
           // your directory already exists.          
        }else{
           // create your directory.
        }

        }) ;            
    }         
}

How to check if directory exists using Yeoman?

3 Answers3