From 683d2b224073fe346ba0fdf51b237a07e4c4fdfd Mon Sep 17 00:00:00 2001
From: toyboot4e <toyboot4e@gmail.com>
Date: Sun, 3 May 2020 17:54:17 +0900
Subject: [PATCH] Fix use of MDBOOK_BOOK

---
 src/config.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/config.rs b/src/config.rs
index 36190ebf..71c0b8f2 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -142,6 +142,22 @@ impl Config {
             let parsed_value = serde_json::from_str(&value)
                 .unwrap_or_else(|_| serde_json::Value::String(value.to_string()));
 
+            if matches!(&*key, "book" | "build") {
+                if let serde_json::Value::Object(ref map) = parsed_value {
+                    // To `set` each `key`, we wrap them as `prefix.key`
+                    let prefix = &key; // "book" or "build"
+                    let mut s = String::new();
+                    for (k, v) in map {
+                        s.clear();
+                        s.push_str(prefix);
+                        s.push('.');
+                        s.push_str(k);
+                        self.set(&s, v).expect("unreachable");
+                    }
+                    return;
+                }
+            }
+
             self.set(key, parsed_value).expect("unreachable");
         }
     }