CODEWITHSUNDEEP
javascriptnode.jsnode-modulesglob
Will Strohl
Will Strohl

Reputation: 1680

Use glob node.js to know if a file exists in the parent folder using wildcard

I need to search in the parent folder of where a node.js yeoman generator script is running to see if a file exists, but I won't know the file name - only the extension.

Glob: https://www.npmjs.com/package/glob

Folder Structure:

Assume that the Project folder is where the command prompt is... I want to run a Yeoman generator that looks into the Company folder first to see if a specific file exists. It could be any file name, ending in .sln.

There are plenty of beginner resources, but I can't find any examples that show:

  1. How to look in the parent folder successfully; and
  2. How to work with the output (true/false?) to use in a variable for logic later in the function.

Here's what I tried to do, but I am admittedly much more adept in C# than I am in JS.

var globbed = glob("../*.sln", function(err, files){
    this.log(chalk.yellow("err = " + err));
    this.log(chalk.yellow("files = " + files));
});

and this...

var gOptions = { cwd: "../" };
var globbed = glob("*.sln", gOptions, function(err, files){
    this.log(chalk.yellow("err = " + err));
    this.log(chalk.yellow("files = " + files));
});

In both examples, globbed is an object, but I don't know what its properties are, and I am not able to access the internal function.

Essentially, I need to know if the file exists so that I can run an If/Then statement on it.

Upvotes: 2

Views: 6371

Answers (3)

R.Sarkar
R.Sarkar

Reputation: 354

Haven't used golb.Hope this will help you.

var fs=require('fs');
var pattern=RegExp('.md$');//Enter file extension here
fs.readdir('..//',(err,files)=>{
      //console.log(files);
      if(files.find((file)=>{return pattern.test(file)==true;})){
          //console.log('file found');  your code
        }
       else{
         //console.log('file not found'); your code
        }
    });

Upvotes: 1

Mark
Mark

Reputation: 181278

Use glob.sync:

const files = glob.sync("*.sln", { cwd: "../" });

or simply

const files = glob.sync("../*.sln");

files will be an array of *.sln files, if any, in the parent directory. Obviously, glob.sync is synchronous.

Upvotes: 4

Domajno
Domajno

Reputation: 637

Try this.

const path = require('path');
const glob = require('glob');

glob(
 '*.sln',
 { cwd: path.resolve(process.cwd(), '..') },  // you want to search in parent directory
 (err, files) => {
   if (err) {
     throw err;
   }

   if (files.length) {
     // File exists. All matched filenames are inside files array.
   } else {
     // File does not exist. files array is empty.
   }
 }
);

glob is an asynchronous function so results are provided in a callback and not returned synchronously.

You can also test you glob expressions using globster.xyz

Upvotes: 1

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