Flesh out helpers to support all OP(Rails) plugins

This currently use a very native approach to determines if a gem is a
OpenProject plugin - simply matching 'openproject-'.

Signed-off-by: Alex Coles <alex@alexbcoles.com>

config/rails-plugins.conf.js

@@ -1,11 +1,41 @@
 require('shelljs/global');
-var path = require('path');
+var path = require('path'),
+    _    = require('lodash');
 
 function rubyBundler(subCmd) {
-  var fullCmd = exec('bundle ' + subCmd);
+  var fullCmd = exec('bundle ' + subCmd, { silent: true });
   return fullCmd.code === 0 ? fullCmd.output : null;
 }
 
+var OpenProjectPlugins = {
+  pluginPaths: _.memoize(function() {
+    var allPaths = (rubyBundler('list --paths') || '').split('\n');
+    return allPaths.filter(function(name) {
+      // naive match
+      return name.match(/openproject-/);
+    });
+  }),
+
+  pluginNamesPaths: function() {
+    return this.pluginPaths().reduce(function(obj, pluginPath) {
+      var pluginName = path.basename(pluginPath).replace(/-[0-9a-fA-F]{12}$/, '');
+      obj[pluginName] = pluginPath;
+      return obj;
+    }, {});
+  },
+
+  findPluginPath: _.memoize(function(name) {
+    return this.pluginNamesPaths()[name];
+  }, _.identity),
+
+  pluginDirectories: function() {
+    return this.pluginPaths().reduce(function(dirList, pluginPath) {
+      var pluginDir = path.dirname(pluginPath);
+      return dirList.indexOf(pluginDir) === -1 ? dirList.concat(pluginDir) : dirList;
+    }, []);
+  }
+};
+
 var TranslationsPlugin = {
   envPath: function() {
     if (env['OPENPROJECT_TRANSLATIONS_ROOT']) {
@@ -13,12 +43,8 @@ var TranslationsPlugin = {
     }
   },
 
-  findBundlerPath: function() {
-    return rubyBundler('show openproject-translations');
-  },
-
   findPluginPath: function() {
-    return this.envPath() || this.findBundlerPath() || '';
+    return this.envPath() || OpenProjectPlugins.findPluginPath('openproject-translations') || '';
   },
 
   findLocaleFiles: function() {
@@ -29,5 +55,6 @@ var TranslationsPlugin = {
   }
 };
 
+exports.pluginDirectories         = OpenProjectPlugins.pluginDirectories();
 exports.translationsPluginLocales = TranslationsPlugin.findLocaleFiles();
 exports.translationsPluginPath    = TranslationsPlugin.findPluginPath();