From 25c504c22f0a48e4a63ee3c52e06346db54de7e2 Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Mon, 1 Apr 2019 15:11:51 +0200
Subject: [PATCH] plugin api docs

---
 README.md | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/README.md b/README.md
index e5a1911f..4ba9bd19 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,7 @@ reveal.js comes with a broad range of features including [nested slides](https:/
 - [Speaker Notes](#speaker-notes)
   - [Share and Print Speaker Notes](#share-and-print-speaker-notes)
   - [Server Side Speaker Notes](#server-side-speaker-notes)
+- [Plugins](#plugins)
 - [Multiplexing](#multiplexing)
   - [Master presentation](#master-presentation)
   - [Client presentation](#client-presentation)
@@ -1205,6 +1206,29 @@ Then:
 3. Run `node plugin/notes-server`
 
 
+## Plugins
+
+Plugins should be registered with reveal.js by calling `Reveal.registerPlugin( 'myPluginID', MyPlugin )`. Registered plugin instances should expose an "init" function that reveal.js can call to initialize them.
+
+When reveal.js is booted up via `Reveal.initialize()`, it will go through all registered plugins and invoke their "init" methods. If the "init" method returns a Promise, reveal.js will wait for that promise to be fullfilled before finshing the startup sequence and firing the [ready](#ready-event) event. Here's an example of a plugin that returns a promise:
+
+```
+Reveal.registerPlugin( 'myPlugin', {
+	init: () => {
+		return new Promise( resolve => setTimeout( resolve, 3000 ) );
+	}
+} );
+Reveal.addEventListener( 'ready', () => console.log( 'Three seconds later...' ) );
+Reveal.initialize();
+```
+
+If the init method does _not_ return a Promise, it is considered ready right away and will not hold up the reveal.js startup sequence.
+
+### Retrieving Plugins
+
+If you want to check if a specific plugin is registered you can use the `Reveal.hasPlugin` method and pass in a plugin ID, for example: `Reveal.hasPlugin( 'myPlugin' )`. If you want to retrieve a plugin instance you can use `Reveal.getPlugin( 'myPlugin' )`.
+
+
 ## Multiplexing
 
 The multiplex plugin allows your audience to view the slides of the presentation you are controlling on their own phone, tablet or laptop. As the master presentation navigates the slides, all client presentations will update in real time. See a demo at [https://reveal-js-multiplex-ccjbegmaii.now.sh/](https://reveal-js-multiplex-ccjbegmaii.now.sh/).