120 lines
2.5 KiB
JavaScript
120 lines
2.5 KiB
JavaScript
/*
|
|
* system.js: Simple memory-based store for process environment variables and
|
|
* command-line arguments.
|
|
*
|
|
* (C) 2011, Charlie Robbins
|
|
*
|
|
*/
|
|
|
|
var util = require('util'),
|
|
optimist = require('optimist'),
|
|
Memory = require('./memory').Memory;
|
|
|
|
//
|
|
// ### function System (options)
|
|
// #### @options {Object} Options for this instance.
|
|
// Constructor function for the System nconf store, a simple abstraction
|
|
// around the Memory store that can read process environment variables
|
|
// and command-line arguments.
|
|
//
|
|
var System = exports.System = function (options) {
|
|
options = options || {};
|
|
Memory.call(this, options);
|
|
|
|
this.type = 'system';
|
|
this.overrides = options.overrides || null;
|
|
this.env = options.env || false;
|
|
this.argv = options.argv || false;
|
|
};
|
|
|
|
// Inherit from the Memory store
|
|
util.inherits(System, Memory);
|
|
|
|
//
|
|
// ### function loadSync ()
|
|
// Loads the data passed in from `process.env` into this instance.
|
|
//
|
|
System.prototype.loadSync = function () {
|
|
if (this.env) {
|
|
this.loadEnv();
|
|
}
|
|
|
|
if (this.argv) {
|
|
this.loadArgv();
|
|
}
|
|
|
|
if (this.overrides) {
|
|
this.loadOverrides();
|
|
}
|
|
|
|
return this.store;
|
|
};
|
|
|
|
//
|
|
// ### function loadOverrides ()
|
|
// Loads any overrides set on this instance into
|
|
// the underlying managed `Memory` store.
|
|
//
|
|
System.prototype.loadOverrides = function () {
|
|
if (!this.overrides) {
|
|
return;
|
|
}
|
|
|
|
var self = this,
|
|
keys = Object.keys(this.overrides);
|
|
|
|
keys.forEach(function (key) {
|
|
self.set(key, self.overrides[key]);
|
|
});
|
|
|
|
return this.store;
|
|
};
|
|
|
|
//
|
|
// ### function loadArgv ()
|
|
// Loads the data passed in from the command-line arguments
|
|
// into this instance.
|
|
//
|
|
System.prototype.loadArgv = function () {
|
|
var self = this,
|
|
argv;
|
|
|
|
if (typeof this.argv === 'object') {
|
|
argv = optimist(process.argv.slice(2)).options(this.argv).argv;
|
|
}
|
|
else if (this.argv) {
|
|
argv = optimist(process.argv.slice(2)).argv;
|
|
}
|
|
|
|
if (!argv) {
|
|
return;
|
|
}
|
|
|
|
Object.keys(argv).forEach(function (key) {
|
|
self.set(key, argv[key]);
|
|
});
|
|
|
|
return this.store;
|
|
};
|
|
|
|
//
|
|
// ### function loadEnv ()
|
|
// Loads the data passed in from `process.env` into this instance.
|
|
//
|
|
System.prototype.loadEnv = function () {
|
|
var self = this;
|
|
|
|
if (!this.env) {
|
|
return;
|
|
}
|
|
|
|
Object.keys(process.env).filter(function (key) {
|
|
return !self.env.length || self.env.indexOf(key) !== -1;
|
|
}).forEach(function (key) {
|
|
self.set(key, process.env[key]);
|
|
});
|
|
|
|
return this.store;
|
|
};
|
|
|