nconf-lite/lib/nconf.js

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/*
* nconf.js: Top-level include for the nconf module
*
* (C) 2011, Charlie Robbins
*
*/
require.paths.unshift(__dirname);
var nconf = exports;
nconf.stores = require('nconf/stores');
//
// ### function use (type, options)
// #### @type {string} Type of the nconf store to use.
// #### @options {Object} Options for the store instance.
// Sets the active `nconf.store` to a new instance of the
// specified `type`.
//
nconf.use = function (type, options) {
if (!nconf.store || type.toLowerCase() !== nconf.store.type) {
nconf.store = new nconf.stores.create(type, options);
}
};
//
// ### function get (key, callback)
// #### @key {string} Key to retrieve for this instance.
// #### @callback {function} **Optional** Continuation to respond to when complete.
// Retrieves the value for the specified key (if any).
//
nconf.get = function (key, callback) {
return nconf.store.get(key, callback);
};
//
// ### function set (key, value, callback)
// #### @key {string} Key to set in this instance
// #### @value {literal|Object} Value for the specified key
// #### @callback {function} **Optional** Continuation to respond to when complete.
// Sets the `value` for the specified `key` in this instance.
//
nconf.set = function (key, value, callback) {
return nconf.store.set(key, value, callback);
};
//
// ### function clear (key, callback)
// #### @key {string} Key to remove from this instance
// #### @callback {function} **Optional** Continuation to respond to when complete.
// Removes the value for the specified `key` from this instance.
//
nconf.clear = function (key, callback) {
return nconf.store.clear(key, callback);
};
//
// ### function load (callback)
// #### @callback {function} Continuation to respond to when complete.
// Responds with an Object representing all keys associated in this instance.
//
nconf.load = function (callback) {
if (!nconf.store.load) {
var error = new Error('nconf store ' + nconf.store.type + ' has no load() method');
if (callback) {
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return callback (error);
}
throw error;
}
return nconf.store.load(callback);
};
//
// ### function save (value, callback)
// #### @value {Object} **Optional** Config object to set for this instance
// #### @callback {function} Continuation to respond to when complete.
// Removes any existing configuration settings that may exist in this
// instance and then adds all key-value pairs in `value`.
//
nconf.save = function (value, callback) {
if (!callback) {
callback = value;
value = null;
}
if (!nconf.store.save) {
var error = new Error('nconf store ' + nconf.store.type + ' has no save() method');
if (callback) {
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return callback (error);
}
throw error;
}
return nconf.store.save(value, callback);
};
//
// ### function reset (callback)
// #### @callback {function} **Optional** Continuation to respond to when complete.
// Clears all keys associated with this instance.
//
nconf.reset = function (callback) {
return nconf.store.reset(callback);
};
//
// ### function key (arguments)
// Returns a `:` joined string from the `arguments`.
//
nconf.key = function () {
return Array.prototype.slice.call(arguments).join(':');
};
//
// ### function path (key)
// #### @key {string} The ':' delimited key to split
// Returns a fully-qualified path to a nested nconf key.
//
nconf.path = function (key) {
return key.split(':');
};
//
// Use the `memory` engine by default
//
nconf.use('memory');