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storage.js
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storage.js
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/*!
* Box - Powerful key -> value storage for the CLI.
*
* Veselin Todorov <hi@vesln.com>
* MIT License.
*/
/**
* Module dependencies.
*/
var fs = require('fs');
var path = require('path');
/**
* Storage.
*
* @type {Object}
*/
var storage = module.exports;
/**
* Data container.
*
* @type {Object}
*/
storage.data = {};
/**
* Sets a value.
*
* @param {String} Key.
* @param {String} Value.
* @param {Function} Callback.
* @api public
*/
storage.set = function(key, value, cb) {
(this.data[key] = value) && cb();
};
/**
* Returns a value.
*
* @param {String} Key.
* @param {Function} Callback.
*/
storage.get = function(key, cb) {
if (arguments.length === 2) return cb(this.data[key] || null);
key(this.data);
};
/**
* Delets a key.
*
* @param {String} Key.
* @param {Function} Callback.
* @api public
*/
storage.del = function(key, cb) {
delete this.data[key] && cb();
};
/**
* Saves file content.
*
* @param {Function} Callback.
*/
storage.save = function(cb) {
fs.writeFile(this.source, JSON.stringify(this.data), function(err) {
cb(err || null)
});
};
/**
* Loads file content.
*
* @param {String} Path to file.
* @param {Function} Callback.
* @api public
*/
storage.load = function(file, cb) {
this.source = file;
this.data = {};
try {
var content = fs.readFileSync(file, 'utf8');
this.data = JSON.parse(content);
} catch(err) {
if (err && err.code !== 'ENOENT') return cb(err);
}
cb(null);
};
/**
* Destroies a storage.
*
* @param {Function} Callback.
*/
storage.destroy = function(cb) {
fs.unlink(this.source, function(err) {
cb(err || null);
});
};