add commands to extension manager

packages/core/src/ExtensionManager.ts

@@ -1,7 +1,7 @@
 import collect from 'collect.js'
 import { keymap } from 'prosemirror-keymap'
 import { inputRules } from 'prosemirror-inputrules'
-import { Editor } from './Editor'
+import { Editor, CommandSpec } from './Editor'
 import Extension from './Extension'
 import Node from './Node'
 
@@ -16,11 +16,20 @@ export default class ExtensionManager {
     this.extensions.forEach(extension => {
       extension.bindEditor(editor)
       editor.on('schemaCreated', () => {
+        this.registerCommands(extension.commands())
         extension.created()
       })
     })
   }
 
+  registerCommands(commands: CommandSpec) {
+    Object
+      .entries(commands)
+      .forEach(([name, command]) => {
+        this.editor.registerCommand(name, command)
+      })
+  }
+
   get topNode() {
     const topNode = collect(this.extensions).firstWhere('topNode', true)