[Plugin] support config for plugins.

Signed-off-by: Eric Wang <skygragon@gmail.com>

Author: skygragon

lib/config.js

@@ -36,7 +36,9 @@ var DEFAULT_SYS_CONFIG = {
     'algorithms',
     'database',
     'shell'
-  ]
+  ],
+
+  PLUGINS: {}
 };
 
 // but you will want change these

lib/core.js

@@ -9,7 +9,7 @@ var h = require('./helper');
 var Plugin = require('./plugin');
 var session = require('./session');
 
-var core = new Plugin('core', 'Core', '20170722', 'Plugins manager');
+var core = new Plugin(99999999, 'core', '20170722', 'Plugins manager');
 
 core.getProblem = function(keyword, cb) {
   this.getProblems(function(e, problems) {

lib/plugin.js

@@ -1,17 +1,19 @@
 var _ = require('underscore');
 
 var h = require('./helper');
+var config = require('./config');
 var log = require('./log');
 
 function Plugin(id, name, ver, desc) {
   this.id = id;
   this.name = name;
   this.ver = ver || 'default';
   this.desc = desc;
-  this.next = null;
 }
 
 Plugin.prototype.init = function() {
+  this.config = config.PLUGINS[this.name] || {};
+  this.next = null;
 };
 
 Plugin.prototype.setNext = function(next) {

lib/plugins/cache.js

@@ -9,6 +9,7 @@ var session = require('../session');
 var plugin = new Plugin(20, 'cache', '', 'Plugin to provide local cache.');
 
 plugin.init = function() {
+  Plugin.prototype.init.call(this);
   cache.init();
 };