Add base for plugin linking/installation

lib/plugins/plugin.js

@@ -1,25 +1,16 @@
-var _ = require('lodash');
 var path = require('path');
 var resolve = require('resolve');
 
 var Promise = require('../utils/promise');
 var gitbook = require('../gitbook');
-
-var PLUGIN_PREFIX = 'gitbook-plugin-';
-
-// Return an absolute name for the plugin (the one on NPM)
-function npmId(name) {
-    if (name.indexOf(PLUGIN_PREFIX) === 0) return name;
-    return [PLUGIN_PREFIX, name].join('');
-}
-
+var registry = require('./registry');
 
 function BookPlugin(book, pluginId) {
     this.book = book;
     this.log = this.book.log;
 
     this.id = pluginId;
-    this.npmId = npmId(pluginId);
+    this.npmId = registry.npmId(pluginId);
     this.baseDir;
 
     this.packageInfos = undefined;

lib/plugins/registry.js

@@ -0,0 +1,38 @@
+var npm = require('npm');
+
+var PLUGIN_PREFIX = 'gitbook-plugin-';
+
+// Return an absolute name for the plugin (the one on NPM)
+function npmId(name) {
+    if (name.indexOf(PLUGIN_PREFIX) === 0) return name;
+    return [PLUGIN_PREFIX, name].join('');
+}
+
+// Return a plugin ID 9the one on GitBook
+function pluginId(name) {
+    return name.replace(PLUGIN_PREFIX, '');
+}
+
+// Validate an NPM plugin ID
+function validateId(name) {
+    return name.indexOf(PLUGIN_PREFIX) === 0;
+}
+
+// Link a plugin for use in a specific book
+function linkPlugin(book, pluginPath) {
+    book.log('linking', pluginPath);
+}
+
+// Install a plugin in a book
+function installPlugin(book, pluginId) {
+    book.log('installing plugin', pluginId);
+}
+
+module.exports = {
+    npmId: npmId,
+    pluginId: pluginId,
+    validateId: validateId,
+
+    link: linkPlugin,
+    install: installPlugin
+};