Add composer support

Not sure the best method of getting the current version of the composer package.
Requesting directly to packagist returns all versions and their metadata which is just enormous.
Too much data for very little benefit, so currently investigating a better way

src/config.js

@@ -4,6 +4,13 @@ window.packageConfig = [
     file: 'package.json',
     registry: window.registry.npm,
     parse: window.parser.json,
-    keys: ['dependencies', 'devDependencies']
+    keys: ['dependencies', 'devDependencies'],
+  },
+  {
+    name: 'composer',
+    file: 'composer.json',
+    registry: window.registry.composer,
+    parse: window.parser.json,
+    keys: ['require', 'require-dev'],
   },
 ];

src/display.js

@@ -26,7 +26,9 @@ function display(deps, devDeps, config) {
 }
 
 function addDependencies(body, deps, registry, dev) {
-  body.appendChild(subHeader(dev))
+  if (deps) {
+    body.appendChild(subHeader(dev))
+  }
 
   for (dep in deps) {
     var row = document.createElement('tr');
@@ -42,7 +44,7 @@ function subHeader(dev) {
   var row = document.createElement('tr');
   var td = document.createElement('td');
   var header = document.createElement('strong');
-  
+
   header.textContent = dev ? 'Development Dependencies' : 'Project Dependencies';
   td.colSpan = tableHeaders.length;
   td.appendChild(header);

src/manifest.json

@@ -17,12 +17,7 @@
     }
   ],
   "permissions": [
-    "https://registry.npmjs.org/"
-  ],
-  "background": {
-    "scripts": [
-      "registry.js"
-    ],
-    "persistent": false
-  }
+    "https://registry.npmjs.org/",
+    "https://packagist.org/"
+  ]
 }

src/registry.js

@@ -15,10 +15,22 @@ function npm(packageName, callback) {
   }
 }
 
+function composer(packageName, callback) {
+  var url = registryConfig.composer + packageName;
+  getExtraPackageData(url, listener);
+
+  function listener() {
+    var data = JSON.parse(this.responseText)['results'][0];
+    callback('-', data.description, data.repository);
+  }
+}
+
 var registryConfig = {
   npm: 'https://registry.npmjs.org/',
+  composer: 'https://packagist.org/search.json?q=',
 };
 
 window.registry = {
   npm: npm,
+  composer: composer,
 };