Add base for loading plugins

1 files changed, 51 insertions, 0 deletions

diff --git a/lib/plugins/manager.js b/lib/plugins/manager.js
index 8617044..b6549d6 100644
--- a/lib/plugins/manager.js
+++ b/lib/plugins/manager.js
@@ -1,10 +1,61 @@
+var _ = require('lodash');
 
+var Promise = require('../utils/promise');
 var BookPlugin = require('./plugin');
 
+
+/*
+PluginsManager is an interface to work with multiple plugins at once:
+- Extract assets from plugins
+- Call hooks for all plugins, etc
+*/
+
 function PluginsManager(book) {
     this.book = book;
     this.plugins = [];
 }
 
+// Returns a plugin by its name
+PluginsManager.prototype.get = function(name) {
+    return _.find(this.plugins, {
+        id: name
+    });
+};
+
+// Load a plugin, or a list of plugins
+PluginsManager.prototype.load = function(name) {
+    var that = this;
+
+    if (!_.isArray(name)) {
+        return Promise.serie(name, function(_name) {
+            return that.load(_name);
+        });
+    }
+
+    return Promise()
+
+    // Initiate and load the plugin
+    .then(function() {
+        var plugin;
+
+        if (!_.isString(name)) plugin = name;
+        else plugin = new BookPlugin(that.book, name);
+
+        if (that.get(plugin.id)) {
+            throw new Error('Plugin "'+plugin.id+'" is already loaded');
+        }
+
+
+        if (plugin.isLoaded()) return plugin;
+        else return plugin.load()
+            .thenResolve(plugin);
+    })
+
+    .then(function(plugin) {
+        that.plugins.push(plugin);
+    });
+};
+
+
 
 module.exports = PluginsManager;