directory-contents

npm install directory-contents --save

Recursively loads directory contents as an object.

Usage

var directoryContents = require('directory-contents');

directoryContents(path [, options], callback)

Asynchronously loads the directory contents, passed to callback.

options is an optional object which can contain the following properties:

• extensions (default: see below) maps file extensions to loader functions.
• recursive (default: true) whether to browse subdirectories.
• stripExtensions (default: true) whether the extensions should be omitted in the contents' properties.

callback takes as first argument an Error object if an error has occured, otherwise undefined, and as second argument the contents object.

Extensions

The options.extensions object specifies how the files are loaded. Keys are lowercase file extensions ("js", "txt"...) and values are asynchronous loader functions with the signature (path: string [, fileStats: fs.Stats], callback: (err|null, contents)). "*" is a special key which matches unspecified extensions.

Convenient loaders are provided:

• directoryContents.readFile: reads the file contents as a Buffer (no encoding is presupposed)
• directoryContents.readText: reads the file contents as a String (encoding is UTF8)
• directoryContents.require: requires the file (works on JS and JSON files)

The default extensions are:

{
	"js": directoryContents.require,
	"json": directoryContents.require,
	"txt": directoryContents.readText,
	"*": directoryContents.readFile
}

When specifying a custom extensions object, it will fully override these default extensions.

Example: only parse YAML files

var directoryContents = require('directory-contents');
var fs = require('fs');
var yaml = require('js-yaml');

directoryContents('test/dir', {
	extensions: {
		yaml: function(filename, callback) {
			return fs.readFile(filename, {
				encoding: 'utf8'
			}, function(err, data) {
				if (err) return callback(err);
				
				var content;
				try {
					content = yaml.load(data);
				} catch (err) {
					return callback(err);
				}
				
				return callback(null, content);
			});
		}
	}
}, function(err, contents) { ... });

Synchronous version

In some cases, such as the start-up initialization, you may require to synchronously load the directory contents. For that, use directoryContents.sync. The explanations above stay true, except that the functions return the values instead of passing them to a callback.

There are also convenient synchronous loaders with the same purpose as the asynchronous ones: directoryContents.sync.readFile, directoryContents.sync.readText, and directoryContents.sync.require.

Example: synchronously parse YAML files

var directoryContents = require('directory-contents');
var fs = require('fs');
var yaml = require('js-yaml');

var contents = directoryContents.sync('test/dir', {
	extensions: {
		yaml: function(filename) {
			var data = fs.readFileSync(filename, {
				encoding: 'utf8'
			});
			return yaml.load(data);
		}
	}
});
...

Although this example is smaller than the previous one, don't let this fool you. In most cases, you should use the asynchronous version, as it implies IO operations.

Test example

Here is the structure of the directory dir (located in the directory test):

dir
 |- config
 |   |- development.js
 |- math.js
 |- recipe.txt

The following code loads the directory contents:

directoryContents('test/dir', function(err, contents) {
	if (err) throw err;
	console.log(contents);
});

Output:

{
	config: {
		development: {
			port: 3000
		}
	},
	math: {
		add: [Function]
	},
	recipe: 'Choux à la crème',
	token: <Buffer 34 32>
}

License

Copyright (c) 2015 Bloutiouf aka Jonathan Giroux

MIT License