time-to-botec/squiggle/node_modules/@stdlib/fs/read-dir

Read Directory

Read the contents of a directory.

Usage

var readDir = require( '@stdlib/fs/read-dir' );

readDir( path, clbk )

Asynchronously reads the contents of a directory.

readDir( __dirname, onRead );

function onRead( error, data ) {
    if ( error ) {
        console.error( error );
    } else {
        console.log( data );
        // => [...]
    }
}

readDir.sync( path )

Synchronously reads the contents of a directory.

var out = readDir.sync( __dirname );
if ( out instanceof Error ) {
    throw out;
}
console.log( out );
// => [...]

Notes

• The difference between this module and fs.readdirSync() is that fs.readdirSync() will throw if an error is encountered (e.g., if given a non-existent path) and this module will return an error. Hence, the following anti-pattern

  var fs = require( 'fs' );
  
  var dir = '/path/to/dir';
  
  // Check for existence to prevent an error being thrown...
  if ( fs.existsSync( dir ) ) {
      dir = fs.readdirSync( dir );
  }
  

  can be replaced by an approach which addresses existence via error handling.

  var readDir = require( '@stdlib/fs/read-dir' );
  
  var dir = '/path/to/dir';
  
  // Explicitly handle the error...
  dir = readDir.sync( dir );
  if ( dir instanceof Error ) {
      // You choose what to do...
      throw dir;
  }
  

Examples

var readDir = require( '@stdlib/fs/read-dir' );

/* Sync */

var out = readDir.sync( __dirname );
// returns <Array>

console.log( out instanceof Error );
// => false

out = readDir.sync( 'beepboop' );
// returns <Error>

console.log( out instanceof Error );
// => true

/* Async */

readDir( __dirname, onRead );
readDir( 'beepboop', onRead );

function onRead( error, data ) {
    if ( error ) {
        if ( error.code === 'ENOENT' ) {
            console.error( 'Directory does not exist.' );
        } else {
            throw error;
        }
    } else {
        console.log( data );
    }
}

---

CLI

Usage

Usage: read-dir [options] <dirpath>

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.

Notes

• Relative paths are resolved relative to the current working directory.
• Errors are written to stderr.
• Directory contents are written to stdout.

Examples

$ read-dir ./../
...
...