117 lines
No EOL
2.4 KiB
JavaScript
117 lines
No EOL
2.4 KiB
JavaScript
/*
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* system.js: Simple memory-based store for process environment variables and
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* command-line arguments.
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*
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* (C) 2011, Charlie Robbins
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*
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*/
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var util = require('util'),
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Memory = require('./memory').Memory;
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//
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// ### function System (options)
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// #### @options {Object} Options for this instance.
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// Constructor function for the System nconf store, a simple abstraction
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// around the Memory store that can read process environment variables
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// and command-line arguments.
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//
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var System = exports.System = function (options) {
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options = options || {};
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Memory.call(this, options);
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this.type = 'system';
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this.overrides = options.overrides || null;
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this.env = options.env || false;
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this.argv = options.argv || false;
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};
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// Inherit from the Memory store
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util.inherits(System, Memory);
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//
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// ### function loadSync ()
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// Loads the data passed in from `process.env` into this instance.
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//
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System.prototype.loadSync = function () {
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if (this.env) {
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this.loadEnv();
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}
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if (this.argv) {
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this.loadArgv();
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}
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if (this.overrides) {
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this.loadOverrides();
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}
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return this.store;
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};
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//
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// ### function loadOverrides ()
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// Loads any overrides set on this instance into
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// the underlying managed `Memory` store.
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//
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System.prototype.loadOverrides = function () {
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if (!this.overrides) {
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return;
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}
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var self = this,
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keys = Object.keys(this.overrides);
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keys.forEach(function (key) {
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self.set(key, self.overrides[key]);
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});
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return this.store;
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};
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//
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// ### function loadArgv ()
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// Loads the data passed in from the command-line arguments
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// into this instance.
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//
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System.prototype.loadArgv = function () {
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var self = this,
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argv;
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if (typeof this.argv === 'object') {
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argv = require('optimist').options(this.argv).argv;
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}
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else if (this.argv) {
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argv = require('optimist').argv;
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}
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if (!argv) {
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return;
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}
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Object.keys(argv).forEach(function (key) {
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self.set(key, argv[key]);
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});
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return this.store;
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};
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//
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// ### function loadEnv ()
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// Loads the data passed in from `process.env` into this instance.
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//
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System.prototype.loadEnv = function () {
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var self = this;
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if (!this.env) {
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return;
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}
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Object.keys(process.env).filter(function (key) {
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return !self.env.length || self.env.indexOf(key) !== -1;
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}).forEach(function (key) {
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self.set(key, process.env[key]);
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});
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return this.store;
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}; |