From c056df597ad5ee98d8a44206563d46d945210f8f Mon Sep 17 00:00:00 2001
From: Michal Budzynski <budziq@gmail.com>
Date: Wed, 13 Sep 2017 22:54:01 +0200
Subject: [PATCH] added `mdbook-runnable` infostring support

makes `ignore`'d playpens runnable
---
 src/renderer/html_handlebars/hbs_renderer.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/renderer/html_handlebars/hbs_renderer.rs b/src/renderer/html_handlebars/hbs_renderer.rs
index f33352c4..78640222 100644
--- a/src/renderer/html_handlebars/hbs_renderer.rs
+++ b/src/renderer/html_handlebars/hbs_renderer.rs
@@ -546,7 +546,7 @@ fn add_playpen_pre(html: &str, playpen_config: &PlaypenConfig) -> String {
             let classes = &caps[2];
             let code = &caps[3];
 
-            if classes.contains("language-rust") && !classes.contains("ignore") {
+            if (classes.contains("language-rust") && !classes.contains("ignore")) || classes.contains("mdbook-runnable") {
                 // wrap the contents in an external pre block
                 if playpen_config.is_editable() &&
                     classes.contains("editable") || text.contains("fn main") || text.contains("quick_main!") {