The v0.8 changes in install.

lib/internals.js

@@ -1,9 +1,35 @@
 'use strict';
 
-/* Load the dependencies */
-var dependencies = require('../config/dependencies.js');
-var xmlDep = require(dependencies.xml);
-var mimeDep = require(dependencies.mime);
+/* the internally used modules */
+require('./Buffer.toByteArray.js');
+var cfg = require('../config/aws.js');
+var tools = require('./tools.js');
+
+/* Load the library dependencies with feature detection */
+var dependencies = {
+	xml: 'libxml-to-js',
+	mime: 'mime-magic'
+};
+
+var xmlDep, mimeDep;
+
+try {
+	xmlDep = require(dependencies.xml);
+	tools.debug('using libxml-to-js');
+} catch (e) {
+	dependencies.xml = 'xml2js';
+	xmlDep = require(dependencies.xml);
+	tools.debug('using xml2js');
+}
+
+try {
+	mimeDep = require(dependencies.mime);
+	tools.debug('using mime-magic');
+} catch (e) {
+	dependencies.mime = 'mime';
+	mimeDep = require(dependencies.mime);
+	tools.debug('using mime');
+}
 
 /* core modules */
 var fs = require('fs');
@@ -18,11 +44,6 @@ var EventEmitter = require('events').EventEmitter;
 /* 3rd party module */
 var lodash = require('lodash');
 
-/* the internally used modules */
-require('./Buffer.toByteArray.js');
-var cfg = require('../config/aws.js');
-var tools = require('./tools.js');
-
 /**
  * Checks the config for the minimally allowable setup
  * 

lib/tools.js

@@ -1,5 +1,8 @@
 'use strict';
 
+/* core module */
+var util = require('util');
+
 /* 3rd party module */
 var lodash = require('lodash');
 
@@ -18,21 +21,20 @@ var merge = function (obj1, obj2) {
 };
 exports.merge = merge;
 
-/*jslint bitwise:true*/
-
 /**
  * Returns the absolute integer value of the input. Avoids the NaN crap.
  * 
  * @param value
  * @returns {Number}
  */
 var absInt = function (value) {
-	return Math.abs(parseInt(value, 10) | 0);
+	/*jslint bitwise:true*/
+	var sureInt = parseInt(value, 10) | 0;
+	/*jslint bitwise:false*/
+	return Math.abs(sureInt);
 };
 exports.absInt = absInt;
 
-/*jslint bitwise:false*/
-
 /**
  * Sorts the keys of an object
  * 
@@ -63,3 +65,10 @@ var escapePath = function (path) {
 	return encodeURI(path);
 };
 exports.escapePath = escapePath;
+
+var debug = function (message) {
+	if (process.env.NODE_ENV === 'development') {
+		util.debug('aws2js - ' + message);
+	}
+};
+exports.debug = debug;

package.json

@@ -1,20 +1,27 @@
 {
   "name": "aws2js",
   "main": "./lib/aws.js",
-  "version": "0.7.11",
+  "version": "0.8.0",
   "description": "AWS (Amazon Web Services) APIs client implementation for node.js",
-  "scripts": {
-    "install": "node tools/install.js"
-  },
   "dependencies": {
     "lodash": ">=0.6.x",
     "semver": ">=1.0.x"
   },
+  "optionalDependencies": {
+    "libxml-to-js": ">=0.3.10",
+    "mime-magic": ">=0.4.1",
+    "xml2js": ">=0.2.2",
+    "mime": ">=1.2.9"
+  },
   "devDependencies": {
     "http-get": ">=0.4.0"
   },
+  "scripts": {
+    "test": "tools/test.sh"
+  },
   "engines": {
-    "node": ">=0.4.10"
+    "node": ">=0.6.0",
+    "npm": ">=1.1.x"
   },
   "homepage": "https://github.com/SaltwaterC/aws2js",
   "author": {

tests/xml-parser.js

@@ -3,35 +3,62 @@
 var common = require('./includes/common.js');
 
 var fs = require('fs');
+var util = require('util');
 var assert = require('assert');
 
 var config = require('../config/aws.js');
-var dependencies = require('../config/dependencies.js');
 
-var xmlDep = require(dependencies.xml);
-var mimeDep = require(dependencies.mime);
+var have = {
+	'libxml-to-js': true,
+	'xml2js': true
+};
 
 var callbacks = {
-	parser: 0
+	'libxml-to-js': 0,
+	'xml2js': 0
 };
 
-var parser;
-if (dependencies.xml === 'libxml-to-js') {
-	parser = xmlDep;
-} else { // xml2js
-	parser = new xmlDep.Parser(config.xml2jsConfig).parseString;
+try {
+	require('libxml-to-js');
+} catch (e) {
+	have['libxml-to-js'] = false;
+	callbacks['libxml-to-js']++;
+	util.log('libxml-to-js is not installed, moving on without it');
+}
+
+try {
+	require('xml2js');
+} catch (e) {
+	util.error('ERROR: xml2js is missing, can not test the installation');
+	process.exit(1);
 }
 
-fs.readFile('data/ec2-describeimages.xml', function (err, data) {
-	assert.ifError(err);
+var testXml = function (lib) {
+	util.log('testing the XML library ' + lib);
+
+	var parser = require(lib);
+	if (lib === 'xml2js') {
+		parser = new parser.Parser(config.xml2jsConfig).parseString;
+	}
 
-	var xml = new Buffer(data).toString();
-	parser(xml, function (err, res) {
-		callbacks.parser++;
+	fs.readFile('data/ec2-describeimages.xml', function (err, data) {
 		assert.ifError(err);
-		assert.equal(res.imagesSet.item[0].imageId, 'ami-be3adfd7');
-		assert.equal(res.imagesSet.item[1].imageId, 'ami-be3adfd9');
+
+		var xml = new Buffer(data).toString();
+		parser(xml, function (err, res) {
+			callbacks[lib]++;
+			assert.ifError(err);
+			assert.equal(res.imagesSet.item[0].imageId, 'ami-be3adfd7');
+			assert.equal(res.imagesSet.item[1].imageId, 'ami-be3adfd9');
+		});
 	});
-});
+};
+
+var idx;
+for (idx in have) {
+	if (have.hasOwnProperty(idx) && have[idx] === true) {
+		testXml(idx);
+	}
+}
 
 common.teardown(callbacks);